Page 1 Model Voltage VRP12K 12,000 VRP12R 12,000 VRP24K 24,000 VRP24R 24,000 VRP36K 36,000 96261401_01...
Page 2: Table Of Contents
TABLE OF CONTENTS Table of Contents INTRODUCTION‑ VRP® Variable Speed System vs. Fixed‑speed System‑ FreshAire™ Conditioned Fresh Air‑ Reheat Coil ‑ Augments VRP’s Dehumidification Capability‑ Important Safety Information‑ Personal Injury Or Death Hazards‑ Model and Serial Number Identification Guides‑ SPECIFICATIONS‑ Cooling Performance‑...
Page 3 TABLE OF CONTENTS VRP Control Boards‑ Main Controller‑ Motor Control Sub‑System (MCS)‑ Heater Board‑ Compressor Control‑ EEV Control‑ Reheat Control‑ Condensate Base Pan Heater‑ Condensate Sump Pan ‑ 36k Models‑ INSTALLATION‑ VRP Required Minimum Clearances‑ Installation Orientations 12&24k‑ Installation Orientations 36k‑ Exterior Wall Opening Dimensios 12 &24k‑...
Page 4 TABLE OF CONTENTS Electronic Expansion Valve (EEV)‑ Reversing Valve Description And Operation‑ Testing The Reversing Valve Solenoid Coil‑ Checking The Reversing Valve‑ Touch Test Chart : To Service Reversing Valves‑ Compressor checks‑ Check the Outdoor Fan 12k/24k‑ Check the Outdoor Fan 36k‑ Replace the Outdoor Fan 12k/24k‑...
Page 5 12‑24K BTU (265V 7.5 & 10 kW)‑ 36K BTU ‑ 208/230V‑ PARTS CATALOG‑ 12k Main Diagram‑ 12k Control Box Diagram‑ 24k Main Diagram‑ 24k Control Box Diagram‑ 36k Main Diagram‑ 36k Control Box Diagram‑ Accessories‑ ACCESSORIES‑ CUSTOMER SATISFACTION and QUALITY ASSURANCE‑ FRIEDRICH AUTHORIZED PARTS DEPOTS‑...
Page 6: Introduction
In sum, The Friedrich VRP offers a significant value to all parties involved in the design and construction of a new building. Because of the simpler and more straightforward nature of the packaged design, and the ability to potentially downsize or eliminate additional make up air and humidity control equipment, the VRP reduces much of the headache and complexity facing the design engineer.
Page 7: Vrp® Variable Speed System Vs. Fixed-Speed System
INTRODUCTION VRP® Variable Speed System vs. Fixed-speed System Low Ambient Heat Pump Performance: Variable speed technology enables VRP units to supply continuous hot air in heat pump mode even at low outdoor ambient temperatures. This reduces strip heat usage resulting in exceptional savings with VRP units when compared with Figure 101(Cost Savings) Precise Temperature &...
Page 8: Freshaire™ Conditioned Fresh Air
INTRODUCTION FreshAire™ Conditioned Fresh Air FreshAire is a dedicated fresh air system that brings in up to 70 CFM of outdoor air into the VRP® unit. The FreshAire system uses one fan (up to 35 CFM) or two fans (up to 70 CFM) (depending on outdoor air CFM volume requirements) to bring in fresh outside air into the the unit.
Page 9: Reheat Coil - Augments Vrp's Dehumidification Capability
INTRODUCTION Reheat Coil - Augments VRP’s Dehumidification Capability Temperature differences are not the only source of discomfort in a living space. Humidity also plays a big role — especially in climates that tend to be both hot and humid. The air conditioning industry’s focus on humidity issues has elevated the importance of dehumidification.
Page 10: Important Safety Information
INTRODUCTION Important Safety Information The information in this manual is intended for use by a qualified technician who is familiar with the safety procedures required for installation and repair, and who is equipped with the proper tools and test instruments required to service this product.
Page 11 DO NOT OPERATE EQUIPMENT DURING ACTIVE STAGES OF CONSTRUCTION To ensure proper operation, Friedrich requires that all equipment is not operated during active construction phases. This includes active stages of completing framing, drywalling, spackling, sanding, painting, flooring, and moulding in the equipment’s designated conditioning space. The use of this equipment during construction could result in premature failure of the components and/or system and is in violation of our standard warranty guidelines.
Page 12: Personal Injury Or Death Hazards
INTRODUCTION Personal Injury Or Death Hazards WARNING AVERTISSEMENT ADVERTENCIA Do not remove, disable or Ne pas supprime, désactiver ou No eliminar, desactivar o pasar SAFETY bypass this unit’s safety contourner cette l´unité des por alto los dispositivos de devices. Doing so may cause dispositifs de sécurité, faire vous seguridad de la unidad.
Page 13: Model And Serial Number Identification Guides
INTRODUCTION Model and Serial Number Identification Guides VRP - 12 - K-50 - F - R - A Series Engineering code VRP Heat Pump Reserved for future options Nominal Capacity (Btu/ Hr.) 12 = 4,000 - 16,000 Operating range Plenum and louver conﬁguration 24 =12,000 - 28,000 Operating range A= Only for 12000 Btu units 36 = 20,000 - 36,000 Ope r ating range...
Page 14: Specifications
SPECIFICATIONS Cooling Performance Model VRP12K / VRP12R VRP24K / VRP12R VRP36K Cooling Performance Data (Cooling Standards: 95°F DB/75°F WB outdoor, 80°F DB/67°F WB indoor) Voltage 230/208 230/208 230/208 Cooling Btu (Rated) 12,000 23,400 33,400 Cooling Btu (Min. – Max) 4,000 – 16,000 12,000 –...
Page 15: 12K Extended Cooling Performance Data
SPECIFICATIONS 12k Extended Cooling Performance Data Indoor Temperature Model: VRP12K 80˚ FDB 70 ˚ FDB 75 ˚ FDB 85 ˚ FDB 90 ˚ FDB 67˚ F WB 60 ˚ F WB 63 ˚ F WB 71 ˚ F WB 73 ˚ F WB (˚...
Page 16 SPECIFICATIONS 24k Extended Cooling Performance Data Model: Indoor Temperature VRP24K 70 ˚ FDB 75 ˚ FDB 80˚ FDB 85 ˚ FDB 90 ˚ FDB 60 ˚ F WB 63 ˚ F WB 67˚ F WB 71 ˚ F WB 73 ˚ F WB (˚...
Page 17: 12 And 24K Extended Heating Performance Data
SPECIFICATIONS 12 and 24k Extended Heating Performance Data Model: Indoor Temperature Dry Bulb (F) VRP12K 70˚ 60 ˚ 80 ˚ (˚ F) Capacity Input Amps Capacity Input Amps Capacity Input Amps (Btu/h) (Btu/h) (Btu/h) 7551 7100 6609 1014 17 ˚...
Page 18: Air Flow Data -12K And 24K
0.017 0.11 CAUTION: If the Friedrich designed plenum and louver combinations are not used, the louver/duct design must be evaluated to insure the total pressure drop does not exceed the maximum allowable limits. Figure 205 (12K and 24K Air Flow Data)
Page 19: Air Flow Data -36K
2030 0.03 0.20 CAUTION: If the Friedrich designed plenum and louver combinations are not used, the louver/duct design must be evaluated to insure the total pressure drop does not exceed the maximum allowable limits. Figure 206 (36K Air Flow Data)
Page 20: Electrical Data
SPECIFICATIONS Electrical Data Voltage Heater Heating Heater ID Blower OD Blower Heating MOP / Model Watts Amps Amps Amps Amps MOCP VRP12K 2500 8530 10.9 0.34 0.57 11.2 14.0 2030 6980 0.38 0.63 10.2 3400 11601 14.8 0.34 0.57 15.1 18.9...
Page 21: 12K And 24K Unit Dimensional Data
43 in ELECTRICAL ENTRY 30 in 34.5 in CONDENS ER EXHAU ST 3.5 in Model VRP12K VRP12R VRP24K VRP24R Dimensions (W x D x H) " x 25 " x 52" " x 25 " x 62" Shipping Dimensions (W x D x H) "...
Page 22: 36K Unit Dimensional Data
SPECIFICATIONS 36k Unit Dimensional Data Model VRP36K Dimensions (W x D x H) 31 3/4" x 29 7/8" x 77 1/4" Shipping Dimensions (W x D x H) 34" x 35" x 81" Net Weight (lbs.) Shipping Weight (lbs.) R410A Charge (oz.) 36K Unit Dimensional Data Figure 209 (...
Page 23: 12K And 24K Unit Installation Dimensional Data
Typical Closet Closet Wall Plenum Access Panel VRP Chassis Louver and hinge (24k shown) Model VRP12K VRP12R VRP24K VRP24R Outside Wall- Cut Out Dimensions Dimensions (W x H) " x 32 " For VRPXWPA-8 or VRPXWPA-14 Plenum Dimensions (W x H) "...
Page 24: 12K And 24K Accessories Dimensional Data-Louvers & Return Access Door
SPECIFICATIONS 12k and 24k Accessories Dimensional Data-Louvers & Return Access Door 12K Louvered Grille 24K Louvered Grille 24K LOUVERED GRI LL E 12K LOUVERED GRILLE 1 1/8 in 29 1/8 in 1 1/8 in 30 ○ 29 1/8 in 2 3/4 in 30 ○...
Page 25: 12K And 24K Accessories Dimensional Data - Wall Plenums
28 3/4 in. 7 1/2 in. 7 1/2 in. 1 1/2 in. high " 6 3/4 in. • The use of a Friedrich wall 27 5/8 in. plenum is required for 19 in. installation. Refer to this 33 3/8 in. 32 in.
Page 26: 36K Accessories Dimensional Data-Louvers
SPECIFICATIONS 36k Accessories Dimensional Data-Louvers VRPXWPC-8/14 VRPXALC/VRPXSCC Accessory Description Outer Dimensions VRPXWPC-8 VRP36 Wall Plenum for 4" to 8" thick wall 33" W x 52” H VRPXWPC-14 VRP36 Wall Plenum for 8" to 14" thick wall 33" W x 52" H VRPXALC VRP36 Architectural Louver 33"...
Page 27: Operation
OPERATION Sequence Of Operations Cooling Sequence: The wall thermostat provides the temperature set point as well as the current dry bulb temperature and relative humidity. Upon a call for cooling, the compressor modulates based on the difference between room temperature and set point. As cooling demand decreases the compressor will modulate to a minimum speed.
Page 28: Wall Controller Operation
OPERATION Wall Controller Operation Wall Controller Operation VRPXWC Control Only Locked Wait Cool Heat Mode: Temperature Cycles between Increment ‘Up’ Heat, Cool or Fan Only Fan: AUTO FAN Sets fan to either Temperature CONTINUOUS -cycle automatically Increment ‘Down’ run continuously Speed: SET POINT ON/OFF...
Page 29 OPERATION Wall Controller Control Only Locked Wait Cool Heat Mode: Cycles between Temperature Heat, Cool or Fan Only Increment ‘Up’ Fan: AUTO FAN Temperature Sets fan to either CONTINUOUS Increment ‘Down’ cycle automatically or run continuously SET POINT ON/OFF: ROOM TEMP Speed: Turn unit CHECK...
Page 30: Freshaire Control
OPERATION FreshAire Control • To engage the FreshAire system, flip the switch into the ‘ON’ position.
Page 31: Startup-Process
Firmware. • Firmware contains the software needed by components to function and is stored to onboard SD cards. • There are three components which require firmware to operate: Friedrich Main Controller VRPXWC Wall Controller Motor Control System (MCS) (FMC)
Page 32 OPERATION Startup-Process Firmware Overview MCS SD cards have a dot. yellow FMC SD cards have a green dot. • All firmware has a “version” to denote the equipment’s operating guidelines. • All firmware versions can be checked/confirmed from the VRPXWC only. It is recommended that the VPXWC is used for startup and troubleshooting purposes.
Page 33: Vpxwc Overview
OPERATION Startup-Process VPXWC Overview System Mode Fan Mode Down Fan Speed On/Off • WC has built-in thermistor that regulates demand in room, also equipped with a secondary sensor on the evaporator coil. Enter Test SD Card Slot Change...
Page 34: Wall Controller Firmware
OPERATION Startup-Process Wall Controller Firmware To read the Wall Controller firmware version, press the System Mode and Test buttons together for 3 seconds. Your display screen will System Mode change to show 2 numbers. Press the down arrow to cycle through all version numbers. The VRPXWC must be updated for it to properly control the unit.
Page 35: Fmc Firmware Via Wall Controller (Wc)
OPERATION Startup-Process FMC Firmware via Wall Controller (WC) To read the FMC firmware version via the Wall Controller, press the Fan Mode and Test buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version Fan Mode numbers.
Page 36: Mcs Firmware Via Wall Controller (Wc)
OPERATION Startup-Process MCS Firmware via Wall Controller (WC) To read the MCS firmware version via the Wall Controller, press the Fan Speed and Change buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 37: Vrpxwc Operating Modes
OPERATION Startup-Process VRPXWC Operating Modes • The VRP currently supports two main operating modes: • Cooling • Heating...
Page 38: Fan Operating Modes
OPERATION Startup-Process Fan Operating Modes • The VRP currently supports two fan operating settings by pressing the FAN button. • Auto Fan • Fan only operates when there is a temperature demand and will assume a standby mode when temperature demand is lost.
Page 39 OPERATION Startup-Process Fan Operating Modes • The VRP currently supports three fan operating speed settings by pressing the SPEED button. • • Fan operated at minimum CFM • High • Fan operated at maximum CFM • Auto Speed (Smart Fan) •...
Page 40: Cooling Operating Mode
OPERATION Startup-Process Cooling Operating Mode Cooling Operation Mode • Press the “Mode” button to display your cooling icon. • Use the up and down arrows to ensure that the set point is lower than the room temperature. • Verify with a temperature measuring instrument (Dry Bulb or IR Thermometer) the decrease in temperature at the register or...
Page 41: Heating Operating Mode
OPERATION Startup-Process Heating Operating Mode • Press the “Mode” button until the heat icon is displayed. • Use the up and down arrows to ensure that the set point is higher than the room temperature. • Verify with a temperature measuring instrument (Dry Bulb or IR Thermometer) for an increase in temperature at the register or diffuser.
Page 42: Button Light Functions
OPERATION Startup-Process Button Light Functions • To change back light dim setting on the buttons: • Press & hold the “Power” button for 3 seconds. • There are 3 different settings: Option 1 (Factory setting) is Auto • Dim. The wall controller’s light will start at 100%, then dim to 20% after 45 seconds of inactivity, finally turning off after another 2 minutes.
Page 43: Vrpxwc Button Sequences
OPERATION Startup-Process VRPXWC Button Sequences Action/Menu Button(s) Press ***hold for 3 seconds*** Filter Reset System Mode + Fan Mode Lock/Unlock Keys Change + Test F/C Toggle Up + Down VRPXWC Firmware Version System Mode + Test FMC Firmware Version Fan Mode + Test MCS Firmware Version Fan Speed + Test Dimness Level...
Page 44: Component Identification
OPERATION Component Identification • Indoor Coil • Indoor Blower • Outdoor Coil • Outdoor Fan • Compressor • Electric Heater • Electronic Expansion Valve (EEV) • 4-Way Reversing Valve • Reheat Solenoids • FreshAire Fan • Pressure Switches • Condensate Base Pan Heaters (optional) •...
Page 45: Indoor Coil 12 & 24K
OPERATION Component Identification Indoor Coil 12 & 24k 12k (1 ton) 24k (2 ton) Slab coil “A” frame coil Monitored by 2 thermistors...
Page 46: Indoor Coil 36K
OPERATION Component Identification Indoor Coil 36k...
Page 47: Indoor Blower
OPERATION Component Identification Indoor Blower • BLDC • Counter Clockwise Impeller • 600-1300 RPM...
Page 48: Outdoor Coil
OPERATION Component Identification Outdoor Coil • Monitored by 1 thermistor...
Page 49: Outdoor Fan
OPERATION Component Identification Outdoor Fan • BLDC • Variable Speed= 600-1000 RPM...
Page 50: Compressor
OPERATION Component Identification Compressor • 12k (1 Ton) • Inverter Rotary • Single Rotor • 24k (2 Ton) • Inverter Rotary • Dual Rotor • 36k (3 ton) • Copeland Scroll...
Page 51: Electric Heater
OPERATION Component Identification Electric Heater • 2.5 / 3.4 / 5.0 / 7.5 / 10.0 Kilowatt variations • Located directly behind the indoor coil and in front of the indoor blower...
Page 52: Electronic Expansion Valve
OPERATION Component Identification Electronic Expansion Valve • Three sizes • • • • Used to control superheat • Controlled by magnetic pulse...
Page 53: 4-Way Reversing Valve
OPERATION Component Identification 4-Way Reversing Valve • 208/230v • Reversing valve assembly...
Page 54: Remaining Components (Side View)
OPERATION Component Identification Remaining Components (Side View) FreshAire Fan* Reheat Exit Solenoid* In-series Reheat Entry Solenoid* Low Pressure Switch High Pressure Switch *if equipped...
Page 55: Vrp Control Boards
OPERATION Component Identification VRP Control Boards Motor Control Sub-system (MCS) Heater Board Friedrich Main Controller (FMC)
Page 56 OPERATION Component Identification Main Controller • Relay and Control Logic (VRP Brain) • Diagnostic Logic • Communicates with: • Wall Controller (WC) • Heater Board • Motor Control Sub-system (MCS) • Handles/Controls: • Electronic Expansion Valve (EEV) • Pressure Switches •...
Page 57 OPERATION Component Identification Main Controller(FMC) Thermistors • • IDC Cool Inlet (T1) • Liquid Heat (T2) • Comp. Suction (T3) • Comp. Discharge (T4) • IDC Heat Cond (T5) • Liquid Cool (T6) • ODC Heat Inlet (T7) • Return Air (T8) •...
Page 58: Motor Control Sub-System (Mcs)
OPERATION Component Identification Motor Control Sub-System (MCS) • High Voltage • Controls: • Compressor • OD Fan • Communicates directly with FMC • Upgradeable • Wall controller via SD card • Manual via SD card...
Page 59 OPERATION Component Identification Motor Control Sub-System (MCS) • Active Power Factor Corrector (PFC) • Handles robust AC voltage range • 187-293 Vac • Maintains healthy DC bus voltage • 430 Vdc • Provides precise motor control • Internal hardware and software protection...
Page 60 OPERATION Component Identification Heater Board • High Voltage • Controls: • Electric Heater • 4-Way (Reversing) Valve • Communicates directly with the FMC...
Page 61: Compressor Control
OPERATION Component Identification Compressor Control • The rate of change of the space conditions is assessed periodically and the compressor frequency is changed accordingly. • Unless diagnostically conflicted, the compressor will operate in some capacity any time there is a cooling or heat pump demand.
Page 62: Eev Control
OPERATION Component Identification EEV Control • The Electronic Expansion Valve is used to maintain superheat during both cooling and heat pump operation. • Superheat (cooling) = Compressor Suction (T3) – IDC Cool Inlet (T1) • Superheat (heat pump) = Compressor Suction (T3) – ODC Heat Inlet (T7) •...
Page 63: Reheat Control
OPERATION Component Identification Reheat Control • The VRP models, when equipped with Evaporator Coil the reheat option, increase room dehumidification capability. • The reheat option has a coil installed Reheat Coil downstream of the main indoor evaporator coil. • When activated, a portion of the compressor discharge gas is routed through the reheat coil.
Page 64: Condensate Base Pan Heater
OPERATION Component Identification Condensate Base Pan Heater • Friedrich offers optional condensate base pan heaters. • These heaters may be required in certain applications. • Base pan heaters work in conjunction with an adjustable thermostatic sensing bulb and will turn on when outdoors temperatures are low enough to cause freezing of condensate in the drain pan.
Page 65: Condensate Sump Pan - 36K Models
OPERATION Component Identification Condensate Sump Pan - 36k Models • Only 36k models utilize a condensate sump pan • During cooling operation condensate from the indoor coil drains into this • The condensate in the pan helps pre- cool the hot liquid refrigerant and increases overall efficiency of the system.
Page 66: Installation
Please carefully read and follow the installation insrtructions and safety warnings detailed in this manual. All applicable na- tional and local mechanical and electrical codes should be followed and take precedence over any Friedrich requirements or reccomenedations regarding installation applications detailed in this manual.
Page 67: Vrp Required Minimum Clearances
UNIT of 72” must be kept. FENCE MAJOR OBSTRUCTIONS The the example pictured above is for reference only and does not represent all possible installations. Please contact Friedrich Air Conditioning for information regarding effects of other installation arrangements.
Page 68: Installation Orientations 12&24K
INSTALLATION Installation Orientations 12&24k Installation Orientations OUTSIDE GRILL OUTSIDE WALL Min. ” Min. ” 25 1/8” 31 1/8” ( Min. Required Inside Closet Dimension ) Min. ” Required 26 1/8” Access Door Cut Out = ” 32” ( Min. Required Inside Closet Dimension ) Front Installation-Top View OUTSIDE GRILL OUTSIDE WALL...
Page 69: Installation Orientations 36K
INSTALLATION Installation Orientations 36k Installation Orientation OUTSIDE GRILL OUTSIDE WALL Min. ” Min. ” 29 7/8” 35 7/8” ( Min. Required Inside Closet Dimension ) Min. ” Required 31 3/4” Access Door Cut Out = 36” 37 3/4” ( Min. Required Inside Closet Dimension ) NOTE: The VRP 3-ton unit comes equipped with bi-directional casters for ease of movement.
Page 70: Exterior Wall Opening Dimensios 12 &24K
INSTALLATION Exterior Wall Opening Dimensions Exterior Wall Opening Dimensios 12 &24k Exterior Wall Rough Opening Dimensions Unit Width Heigth Compact 28 1/8" 32 1/4" (VRPXWPA-*) Standard 28 1/8" 42 1/4" (VRPXWPB-*) Compact (A) configuration is for 12000 BTU units only. Standard (B) configuration is for 24000 BTU and 12000 BTU units.
Page 71 INSTALLATION Exterior Wall Opening Dimensios 12 &24k Exterior Rough Opening WALL OPENING DIMENSIONS Unit " " 24K* " " *Also applicable for 12K unit if VRPXALB/ VRPXSCB Louver and VRPXWPB-8/ VRPXWPB-14 plenum are selected to be used with 12K unit. (Hint: Your unit model name should have B S) letter ‘B ’...
Page 72: Exterior Wall Opening Dimensios 36K
INSTALLATION Exterior Wall Opening Dimensios 36k Exterior Wall Opening Dimensions Exterior Wall Rough Opening Dimensions Unit Width Height VRPXWPC-* 33" 52 1/4" NOTE: The distance between the rough opening and the finished floor/platform must be 4”. 33" 52 1/4" 4"...
Page 73: Interior(Closet) Wall Opening Dimensions 12 & 24K
INSTALLATION Interior (Closet) Wall Opening Dimensions Interior(Closet) Wall Opening Dimensions 12 & 24k Return Air Access Door Wall Cut-Out 30” 69¾” NOTE: To maintain ease of removal and serviceability, if the unit is installed on a platform ensure that the total height of the unit from the floor does not exceed the height of the interior rough opening.
Page 74: Interior(Closet) Wall Opening Dimensions 36K
INSTALLATION Interior (Closet) Wall Opening Dimensions Interior(Closet) Wall Opening Dimensions 36k Return Air Access Door Wall Cut-Out Interior Wall Rough Opening Dimensions Unit Width Height VRP36 36" 84" NOTE: Dimensions based on standard 36” door frame.
Page 75: Preliminary Plumbing
INSTALLATION Preliminary Plumbing Preliminary Plumbing Standard (Front Install) The image to the right shows the installation closet for the standard (Front Install) configuration (where the wall plenum is opposite the service access door). A drainage system is required, and should provide a “P-trap”...
Page 76: Wall Plenum Installation 12 & 24K
INSTALLATION Wall Plenum Installation Wall Plenum Installation 12 & 24k Parts included in Plenum kit: Outside Plenum (Part A) Divider (Part C) Inside Plenum (Part B) Baffle (Part D) Field Supplied Parts: Sealant, attachment screws, and flashing Flashing are field supplied. Silicone sealant is recommended. Sealant VRPXWPA-8, VRPXWPB-8 adjust for walls up to 4”- 8”...
Page 77 INSTALLATION Wall Plenum Installation Wall Plenum Installation 12 & 24k Step 1 - Outside Wall Plenum Half Note: The wall plenum is not designed to carry any structural load. A load bearing header must be built above the rough opening. Prepare the rough opening.
Page 78 INSTALLATION Wall Plenum Installation Wall Plenum Installation 12 & 24k Step 2 - Inside Wall Plenum Half Caulk all 8 Flange Corners and Unused Holes Detail A 1) Apply sealant to all 4 flange corners and unused holes. See Detail A. 2) Place the baffle (Part D) on the approprate baffle mounting tabs located on the inner perimeter of the inside plenum half based on unit size (Compact/Standard).
Page 79 INSTALLATION Wall Plenum Installation Wall Plenum Installation 12 & 24k Step 3 - Inside Wall Plenum (cont.) Detail B Note: Do not place any screws, fasteners, or penetrating holes through the top or bottom of the plenum assembly. 1) Drill pilot holes on the interior of the inside plenum half (Part B) as show in Detail B. Pilot holes should be located approxiamtely 4”...
Page 80: Wall Plenum Installation 36K
INSTALLATION Wall Plenum Installation Wall Plenum Installation 36k Parts included in Plenum kit: Outside Plenum (Part A) Divider (Part C) Inside Plenum (Part B) Baffle (Part D) Field Supplied Parts: Sealant, attachment screws, and flashing Flashing are field supplied. Silicone sealant is recommended. Sealant VRPXWPC-8 adjusts for walls 4”- 8”...
Page 81 INSTALLATION Wall Plenum Installation Wall Plenum Installation 36k Step 1 - Outside Wall Plenum Half Note: The wall plenum is not designed to carry any structural load. A load bearing header must be built above the rough opening. 1) Prepare the rough opening. The rough opening should be lined with metal or wood. The plenum will warp if sealed against concrete or brick.
Page 82 INSTALLATION Wall Plenum Installation Wall Plenum Installation 36k Caulk all 8 Flange Corners and Unused Holes Detail A 1) Apply sealant to all 4 flange corners and unused holes. See Detail A. 2) Flash the inside of the rough opening to ensure the proper fit and level. 3) Insert inside plenum half (Part B) into Outside Plenum Half (Part A).
Page 83 INSTALLATION Wall Plenum Installation Wall Plenum Installation 36k Step 3 - Inside Wall Plenum (cont.) Detail A Note: Do not place any screws, fasteners, or penetrating holes through the top or bottom of the plenum assembly. 1) Drill pilot holes on the interior of the inside plenum half (Part B) as show in Detail A. Pilot holes should be located approximately 4”...
Page 84: Louver Installation
INSTALLATION Installation of the louver PRIOR to Wall Plenum Installation Hold the louver up to the Outside Wall Plenum Part A and line up the louver top with the very top edge of the 3/4” flange. Line up Louver Installation the Wall Plenum holes with the threaded holes in the louver, install and tighten the 8 screws.
Page 85: Final Wall Plenum And Architectual Louver Installation
INSTALLATION Final Wall Plenum And Architectual Louver Installation Final Wall Plenum and Architectural Louver Installation Plenum Divider Extension Plate Installed Plenum Divider Extension Plate (Baffle) into Full Plenum Assembly Ensure that the weather strip is undamaged and provides a continuous seal around the inner perimeter of the plenum.
Page 86: Unit Installation
INSTALLATION Unit Installation Unit Installation Unit Placement Prior to Installation (Front-Install Configuration) All louver, plenum, rough plumbing, and rough wiring steps must be complete prior to final installation of the air conditioning chassis.
Page 87: Final Unit Installation Overview
INSTALLATION Final Unit Installation Overview Final Unit Installation Overview Unit Final Placement - Front Install Ensure that power if off at the junction box feeding power to the air conditioner until all process steps are completed. Move the unit from the shipping base and onto the installation site. Insert the unit’s rear extension into the wall plenum.
Page 88: Side Configuration Installation
INSTALLATION Side Configuration Installation Side Configuration Installation Left Install VRP Unit Left Install VRP Unit Prepared for Installation in Closet (Fully Installed) For side-install applications, place the unit adjacent to the closet and slide it in. Then, slide the unit backwardward into the plenum.
Page 89: Unit Drain Installation
INSTALLATION Final Drain Installation Unit Drain Installation Unit Drain Installation ” ” ” NOTE: Failure to follow the following procedures may result in serious property damage. A field supplied secondary condensate pan may be required. Check with local codes. In case of drainage system blockage, the unit base will allow excess water to flow out of the unit through the plenum and the architectural louver.
Page 90: Ductwork Installation
INSTALLATION Ductwork Installation Ductwork Installation Supply air duct connection is the responsibility of the installer and should be installed per industry best practices. Sheet metal or duct board may be used for the transition from the discharge to 10” or larger diameter flexible ducting.
Page 91: Wall Controller Installation 12 & 24K
INSTALLATION Wall Controller Installation Wall Controller Installation 12 & 24k Remove the wall controller bracket from the back of the wall controller. 3 ¼” The wall bracket screw locations only allow the bracket (Detail A) to be mounted to a horizontally oriented electrical junction box (Detail B).
Page 92 INSTALLATION Wall Controller Installation Wall Controller Installation 12 & 24k Proper Wiring of VRP unit to VRPXWC Wall Control Use shielded and stranded CAT 6 cable with twisted pairs to wire the wall controller. Use the wire colors with the corresponding terminals on the wall controller to the VRP unit as shown in the table below. Table shows which wire pairs go with which screw terminal.
Page 93 INSTALLATION Wall Controller Installation Wall Controller Installation 12 & 24k Step 1: Wiring the VRPXWC Wall Controller A. Remove the wall mount bracket from the wall controller. B. Insert the wires from back of wall mount bracket. C. Strip the wire ends 9/16" (15 mm). D.
Page 94 INSTALLATION Wall Controller Installation 12 & 24k Wall Controller Installation Install the wall controller into place on the previously installed wall controller bracket.
Page 95: Wall Controller Installation 36K
INSTALLATION Wall Controller Installation 36k Wall Controller Installation Proper Wiring of VRP unit to Wall Controller Use shielded and stranded CAT 6 cable with twisted pairs to wire the wall controller. Use the wire colors with the corresponding terminals on the wall controller to the VRP unit as shown in the table below. Table shows which wire pairs go with which screw terminal.
Page 96 INSTALLATION Wall Controller Installation 36k Wall Controller Installation WIRE COLOR LABEL Connection 1 Orange Orange Green/White Connection 2 Brown V+ D- Brown Blue/White Connection 3 Blue Blue Brown/White Connection 4 Green Green Orange/White Ground Shield Wire Strip and untwist the individual CAT 6 wires. Pair the wires on both ends based on the combinations detailed in the table above.
Page 97: Electrical Installation 12 & 24K
INSTALLATION Electrical Installation Electrical Installation Electrical Installation 12 & 24k Electrical Installation Electrical Installation Remove and discard hole knock-out from the side of the unit (Detail A) Remove and discard hole knock-out from the side Remove and discard hole knock-out from the side of the unit (Detail A) Remove and discard hole knock-out from the side of the unit (Detail A)
Page 98 INSTALLATION Electrical Installation Electrical Installation 36k Remove and discard hole knock-out from the side of the unit (Detail A) NOTE: Only one punch-out needs to be removed for 0.0 kW and 10.0 kW models.. Both punch-outs must be removed on the 15.0 kW models for dual service. Remove the front access panel (Detail A) to expose the electrical box and incoming Power terminal block (see below) Insert all wires through the...
Page 99: Return Air Door Installation12 & 24K
INSTALLATION Return Air Door Installation Return Air Door Installation12 & 24k Option 1 Option 2 The door panel is supported along one edge by the provided hinge. The opposite edge has a latch which secures the panel to the adjacent framed structure. The kit contains hinge bracket for mounting the door with the return air openings low (shown in option 1) or high (shown in Option 2) on the door.
Page 100: Return Air And Door Installation 36K
INSTALLATION Return Air And Door Installation 36k Return Air & Door Installation A 36” door louvered door is recommended for all VRP36 installations. The louvered portion of the door should have a minimum of 325 sq. in. of free area. Alternatively, a solid door may be used in tandem with a transfer register on an adjacent wall to the closet.
Page 101: Freshaire System Set-Up And Operation
INSTALLATION FreshAire™ System Set-Up and Operation FreshAire System Set-up and Operation FreshAire™ System Set-Up and Operation DETA IL If equipped with the FreshAire™ System, the unit will come with a FreshAire filter and blank-off plate. Detail A Remove the blank-off plate prior to turning the unit on. If equipped with the FreshAire™...
Page 102: Final Installation Checklist
(F option) outdoor air fan and filter, or dual leaves the module through a filter and enters the operator of the equipment. Friedrich Warranty Service Company in the area (D option) outdoor air fans and filters. indoor space in front of the indoor conditioning coil.
Page 103: Return Air Grille/ Access Panel Vrpxap1
VRP Se ONLY. Refer INSTALLATION R XAP1 Return Air Grille/ Access Panel VRPXAP1 Parts Included in this Kit Parts not Included in this Kit VRPXAP1 Return Air Grille / Access 24" x 16" Filter, QTY 2 Panel (72" Tall x 32" Wide) 5/32"...
Page 104: R-410A Sealed System Repair
R-410A SEALED SYSTEM REPAIR The following is a list of important considerations when working with R‑410A equipment WARNING R‑410A pressure is approximately 60% higher than R‑22 pressure. Refrigeration system under high pressure 2. R‑410A cylinders must not be allowed to exceed 125 F, they may leak or rupture. 3.
Page 105: Refrigerant Charging
R-410A SEALED SYSTEM REPAIR Refrigerant Charging WARNING RISK OF ELECTRIC SHOCK Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenances or service. Failure to do so could result in electric shock, serious injury or death. WARNING RISK OF ELECTRIC SHOCK Unplug and/or disconnect all electrical power to the unit before performing inspections,...
Page 106: Undercharged Refrigerant Systems
R-410A SEALED SYSTEM REPAIR Undercharged Refrigerant Systems An undercharged system will result in poor performance (low pressures, etc.) in both the heating and cooling cycle. Whenever you service a unit with an undercharge of refrigerant, always suspect a leak. The leak must be repaired before charging the unit.
Page 107: Overcharged Refrigerant Systems
R-410A SEALED SYSTEM REPAIR Overcharged Refrigerant Systems Compressor amps will be near normal or higher. Noncondensables can also cause these symptoms. To confirm, remove some of the charge, if conditions improve, system may be overcharged. If conditions don’t improve, Noncondensables are indicated.
Page 108: Restricted Refrigerant System
R-410A SEALED SYSTEM REPAIR Restricted Refrigerant System Troubleshooting a restricted refrigerant system can be difficult. The following procedures are the more common problems and solutions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions. A partial restriction allows some of the refrigerant to circulate through the system.
Page 109: Sealed System Method Of Charging/ Repairs
R-410A SEALED SYSTEM REPAIR Sealed System Method of Charging/ Repairs WARNING CAUTION BURN HAZARD FREEZE HAZARD Proper safety procedures must be followed, Proper safety procedures must be followed, and proper protective clothing must be worn and proper protective clothing must be worn when working with a torch.
Page 110: Compressor Replacement
R-410A SEALED SYSTEM REPAIR Compressor replacement 1. Be certain to perform all necessary electrical and refrigeration tests to be sure the compressor is actually defective before replacing. WARNING ELECTRIC SHOCK HAZARD 2. Recover all refrigerant from the system though the process tubes. Disconnect power to the unit before PROPER HANDLING OF RECOVERED REFRIGERANT ACCORDING TO servicing.
Page 111: Compressor Replacement -Special Procedure In Case Of Compressor Burnout
R-410A SEALED SYSTEM REPAIR Compressor Replacement -Special Procedure in Case of Compressor Burnout 1. Recover all refrigerant and oil from the system. WARNING 2. Remove compressor,and EEV. 3. Flush evaporator, condenser and all connecting tubing with dry HIGH PRESSURE HAZARD nitrogen or equivalent.
Page 112: Replace The Reversing Valve
R-410A SEALED SYSTEM REPAIR Replace The Reversing Valve WARNING HIGH PRESSURE HAZARD NOTICE Sealed Refrigeration System contains refrigerant and oil under high pressure. FIRE HAZARD Proper safety procedures must be followed, and proper protective clothing must be worn electically unsafe conditions which could cause moderate when working with refrigerants.
Page 113: Replace The Condensor Coil 12K/24K
R-410A SEALED SYSTEM REPAIR Replace The Condensor Coil 12k/24k 1. Remove unit from the closet. 2. Ensure no charge is left in the system, evacuating according to EPA standards. 3. Remove the lower left panel. 4. Remove six mount screws on rear of condenser coil. 5.
Page 114: Replace The Condensor Coil 36K
R-410A SEALED SYSTEM REPAIR Replace The Condensor Coil 36k 1. Remove unit from the closet. 2. Ensure no charge is left in the system, evacuating according to EPA standards. 3. Remove the front and side panels. 4. Sweat out tubing connections to condenser coil as required 5.
Page 115: Replace The Evaporator Coil 12K/24K
R-410A SEALED SYSTEM REPAIR Replace The Evaporator Coil 12k/24k 1. Remove unit from closet. 2. Ensure no charge in the system, evacuating according to EPA standards. 3. Remove top panel. 4. Remove duct collar. 5. Remove left side upper panel. NOTE: The 24k units utilize 2 evaporator coils and 2 reheat coils if applicable.
Page 116: Replace The Evaporator Coil 36K
R-410A SEALED SYSTEM REPAIR Replace The Evaporator Coil 36k 1. Remove unit from closet. 2. Ensure no charge in the system, evacuating according to EPA standards. 3. Remove front, side, and top panels Caution: Rear blower panel will need to be supported or removed if top panel is removed.
Page 117: Replace The Evaporator Coil Drain Pan
R-410A SEALED SYSTEM REPAIR Replace The Evaporator Coil Drain Pan 1. Remove unit from the closet. 2. Remove top panel. 3. Remove filter. 4. Remove left and right upper side panels 5. Carefully lift coil up a few inches and support to avoid damage to tubing. 6.
Page 118: External Static Pressure
EXTERNAL STATIC PRESSURE External Static Pressure can best be defined as the pressure difference (drop) between the Positive Pressure (discharge) and the Negative Pressure (intake) sides of the blower. External Static Pressure is developed by the blower as a result of resistance to airfl ow (Friction) in the air distribution system EXTERNAL to the VRP cabinet.
Page 119 EXTERNAL STATIC PRESSURE Determining the Indoor CFM Model VRP12K/ VRP12R VRP24K/ VRP24R VRP36K Air Flow Data Indoor CFM High High High .10” ESP* .15 ESP* 1015 1200 .20” ESP 1160 .30” ESP 1080 .40” ESP .50” ESP * Rated at 0.10” ESP, High and includes 0.08” ESP for factory installed 1” filter...
Page 120 EXTERNAL STATIC PRESSURE Ductwork Preparation If flex duct is used, be sure all the slack is pulled out of the flex duct. Flex duct ESP can increase considerably when not fully extended. DO NOT EXCEED a total of .30 ESP, as this is the MAXIMUM design limit for the VERT‑I‑PAK A‑Series unit. IMPORTANT: FLEX DUCT CAN COLLAPSE AND CAUSE AIRFLOW RESTRICTIONS.
Page 121: Component Testing
COMPONENT TESTING Electronic Expansion Valve (EEV) WARNING WARNING BURN HAZARD CUT/SEVER HAZARD Proper safety procedures must be followed, Be careful with the sharp edges and corners. Wear protective clothing and gloves, etc. and proper protective clothing must be worn when working with a torch. Failure to do so could result in serious injury.
Page 122: Reversing Valve Description And Operation
COMPONENT TESTING Reversing Valve Description And Operation The Reversing Valve controls the direction of refrigerant flow to the indoor and outdoor coils. It consists of a pressure-operated, main valve and a pilot valve actuated by a solenoid plunger. The solenoid is energized during the heating cycle only.
Page 123: Testing The Reversing Valve Solenoid Coil
COMPONENT TESTING Testing The Reversing Valve Solenoid Coil WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. The solenoid coil is an electromagnetic type coil mounted on the reversing valve and is energized during the operation of the compressor in the heating cycle.
Page 124: Checking The Reversing Valve
COMPONENT TESTING Checking The Reversing Valve WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure. Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants. Failure to follow these procedures could result in serious injury or death.
Page 125: Touch Test Chart : To Service Reversing Valves
COMPONENT TESTING Touch Test Chart : To Service Reversing Valves NORMAL FUNCTION OF VALVE NOTES: VALVE OPERATING * TEMPERATURE OF VALVE BODY CONDITION ** WARMER THAN VALVE BODY POSSIBLE CAUSES CORRECTIONS Cool Normal Cooling Cool *TVB as (2) as (1) Cool Normal Heating Cool...
Page 126: Compressor Checks
COMPONENT TESTING Compressor checks WARNING WARNING BURN HAZARD ELECTRIC SHOCK HAZARD Proper safety procedures must be followed, Disconnect power to the unit before and proper protective clothing must be worn servicing. Failure to follow this warning when working with a torch. could result in serious injury or death.
Page 127: Check The Outdoor Fan 12K/24K
COMPONENT TESTING Check the Outdoor Fan 12k/24k Caution: Wait for 2 minutes after removing power from the unit to allow capacitors to discharge before handling the MCS board, disconnecting leads or connectors, or taking ohm readings. 1. Remove outdoor fan connector from MCS board at J8 as shown in figure below. 2.
Page 128: Check The Outdoor Fan 36K
COMPONENT TESTING Check the Outdoor Fan 36k Caution: Wait for 2 minutes after removing power from the unit to allow capacitors to discharge before handling the MCS board, disconnecting leads or connectors, or taking ohm readings. 1. Check that red and black wires have line voltage at terminal block.
Page 129: Replace The Outdoor Fan 12K/24K
COMPONENT TESTING Replace the Outdoor Fan 12k/24k Caution: Wait for 2 minutes after removing power from the unit to allow capacitors to discharge before handling the MCS board, disconnecting leads or connectors, or taking ohm readings. 1. Remove unit from closet. 2.
Page 130: Replace The Outdoor Fan Motor36K
COMPONENT TESTING Replace the Outdoor Fan Motor36k 1. Remove front panel. 2. Disconnect and tag fan motor electrical connections. 3. Loosen set screw attaching fan blade to fan motor shaft. 4. Loosen belly band clamp bolt. 5. Remove Motor. 6.Install new motor in reverse sequence. Figure 608 (Outdoor Fan)
Page 131: Check The Indoor Fan 12K/24K
COMPONENT TESTING Check the Indoor Fan 12k/24k 1. Check for line voltage at yellow molex connector. NOTE:To unplug connector, pull down on the red locking tab and squeeze the connector while pulling down. 2. If no line voltage trace back to terminal block 3.
Page 132: Check The Indoor Fan 36K
COMPONENT TESTING Check the Indoor Fan 36k 1. Check for line voltage at terminal block.(blue and red wires) Note: There is an inline fuse installed on red wire (check for continuity if line voltage is not present.) always ensure power is removed from unit when checking continuity) 2.
Page 133: Replace The Indoor Fan 12K/24K
COMPONENT TESTING Replace the Indoor Fan 12k/24k 1. Remove unit from closet. 2. Unplug yellow and white molex connectors. Unlock connector by pulling down on red tab and squeezing connector. 3. Remove wires from clips back to fan 4. Remove duct collar by removing screws 5.
Page 134: Replace The Indoor Fan 36K
COMPONENT TESTING Replace the Indoor Fan 36k 1. Remove unit from closet. 2. Disconnect Indoor fan electrical connections. Tag and identify. 3. Remove wires from clips back to fan. 4. Remove rear panel by removing perimeter screws. 6. Remove rear panel from fan by removing 10 screws. 7.
Page 135: Check The Heating Elements
COMPONENT TESTING Check the Heating Elements Figure 609 (Heating Elements) THERMAL DISC COIL 1 COIL 2 COIL 3 THERMAL DISC FUSE LIMITER 265V 10 KW MULTI 5000KW 2500 KW 2500 KW OPEN 165°F OPEN 240°F CLOSE 135°F 12.35 OHMS +‑5% 24.71 OHMS +‑...
Page 136: Replace The Heating Elements
COMPONENT TESTING Replace the Heating Elements 1. Remove duct work as neccesary to gain access to top panel. 2. Remove top panel. Note: on 36k units remove access panel on top of unit. 3. Disconnect input wires (2 places) 4. Remove Mounting screws (4 places). 5.
Page 137: Mcs Motor Control System Board Pin Out
COMPONENTS TESTING Mcs Motor Control System Board Pin out RS485 - Y RS485 - Z RS485 - A RS485 - B Ground Fuses Compressor Pinout Figure 616 (MCS Board) 1. Check power from pins 1 to 2 for 12 volts. 2.
Page 138: Mcs Motor Control System Board Replacement
COMPONENTS TESTING Mcs Motor Control System Board Replacement 1. Remove power from the unit and wait 2 minutes for capacitor bleed off before removing leadsd or handling the MCS board. 2. Disconnect electrical connections and tag wires. 3. Unhook heater board communication cable to avoid damage. 3.
Page 139: Fmc Board Pin Out
COMPONENTS TESTING Fmc Board Pin Out Ret Air IC Coil Inlet Supply Air ID Coil – Heat Cond. RS485 - Y RS485 - Z RS485 - A RS485 - B RS232 - TX RS232 - RX Comp. Suct. Cool Liq. OD Coil OD Amb.
Page 140: Fmc Board Replacement
COMPONENTS TESTING FMC Board Replacement Note: When ordering the part, the model and serial number must be supplied for flashing of board. 1. Disconnect all electrical connections, tag and identify wires. 2. Carefully compress pcb standoffs and remove board. 3. Install new board. Figure 619 (FMC Board)
Page 141: Heater Board Pin Out
COMPONENTS TESTING Heater Board Pin Out 12V RS232-RX RS232-TX RV L1 RV L2 Heater Relays SSR+ SSR‑ Figure 620 (Heater Board) 1. Check for 12 volts between VCC 1 and ground. 2.Check for line voltage at L1 and L2, reversing valve L1 and L2, 3.Check voltage at SSR + an ‑...
Page 142: Heater Board Replacement
COMPONENTS TESTING Heater Board Replacement 1. Ensure power is removed from the unit. 2. Disconnect all wires and identify. 3.Remove board by carefully compressing standoffs. 4. Install new board. Heater Board Figure 621 (Heater Board)
Page 143: Thermistor Locations
COMPONENTS TESTING Thermistor Locations T8 (Return Air Sensor) The T8 (Return Air Sensor) is located behind the Air Filter. Figure 622 (Thermistor Locations)
Page 144: T1 (Evaporator Coil In Sensor)
COMPONENTS TESTING Thermistor Locations T1 (Evaporator Coil In Sensor) T5 (Evaporator Coil Out Sensor) To access the evaporator coil sensors remove the top panel and right side upper panel. The top sensor is T5 ( Evap. Coil Out) The lower sensor is T1 ( Evap. Coil In.) Figure 623 (Thermistor Locations)
Page 145: T9 (Discharge Air Sensor)
COMPONENTS TESTING Thermistor Locations T9 (Discharge Air Sensor) The T9 discharge air sensor is located inside the blower housing. Figure 624 (Thermistor Locations)
Page 146: T2 (Liquid Heat)
COMPONENTS TESTING Thermistor Locations T2 (Liquid Heat) T6 (Liquid Cool) The T2 and T6 Sensors are located in the outdoor section attached to the EEV ( Electronic Expansion Valve). The pipe going into the bottom of the EEV is T2 (Liquid Heat). The one on the pipe leaving the side of the EEV is T6 (Liquid Cool).
Page 147: T10 (Outdoor Ambient Air Sensor)
COMPONENTS TESTING Thermistor Locations T10 (Outdoor Ambient Air Sensor) The T10 (Outdoor Ambient Air Sensor) is located in the outdoor section, mounted on the bottom of the indoor blower housing. Figure 626 (Thermistor Locations)
Page 148: T7 (Cond. Coil Sensor)
COMPONENTS TESTING Thermistor Locations T7 (Cond. Coil Sensor) T7 (Cond. Coil Sensor is attached to the outdoor coil on the right hand side. This sensor is attached to the coil roughly halfway down on one of the return bends. Figure 627 (Thermistor Locations)
Page 149: T4 (Comp. Discharge)
COMPONENTS TESTING Thermistor Locations T4 (Comp. Discharge). The T4 (Comp. Discharge) is attached to the compressor discharge line. Figure 628 (Thermistor Locations)
Page 150: T3 (Comp. Suction)
COMPONENTS TESTING Thermistor Locations T3 (Comp. Suction). The T3 (Comp. Suction) is attached to the compressor suction line. Figure 629 (Thermistor Locations)
Page 151: Thermistor Values
COMPONENTS TESTING Thermistor Values RESISTANCE TEMP RESISTENCE (K Ohms) TOLERANCE % All thermistors in the VRP units have CENTR a 10k ohm Resistence at 77° F. 210.889 225.548 240.224 6.50 6.51 178.952 190.889 202.825 6.25 6.25 The chart below shows the value vs. 151.591 161.325 171.059...
Page 152: Thermistor Part Numbers
COMPONENTS TESTING Thermistor Part numbers VPH and VRP revision –A/B models used a sensor pack for the indoor and outdoor sensors. VRP revision –C and newer all use single sensors. THe Single sensors are compatible with the sensor pack. The sensor packs are no longer available and all VRP/VPH models will use the single sensors going forward. The part numbers for the individual sensors are listed here.
Page 153: Check High And Low Pressure Limit Switches
COMPONENTS TESTING Check High and Low Pressure Limit Switches 1. Ensure power is removed from the unit. 2. At fmc board disconnect the orange (J8) and yellow (J7) wires. 3. The switches are wired together in series and if either switch is faulty you will get an error code 14. 4.
Page 154: Replace High Pressure Limit Switch
COMPONENTS TESTING Replace High Pressure Limit Switch DISCONNECT POWER AND FOLLOW ALL LABELED WARNINGS. NOTE The pressure switch can either be replaced by brazing in a new part of ordering a "bolt-on" kit that attached to the service port. The method below describes the use of the bolt-on kit. Step 1.
Page 155 COMPONENTS TESTING Replace High Pressure Limit Switch Step 3. Install pressure switch to discharge tube service port. To minimize refrigerant loss, install assembly quickly. Step 4. Cut the wires o old pressure switch and strip them. Attach to existing wire to new pressure switch wires with the two wire nuts supplied in kit.
Page 156: Troubleshooting
TROUBLESHOOTING VRP Troubleshooting Map Review Design Check Application Verify Installation Troubleshoot System Figure 701 (Troubleshooting Map)
Page 157: Required Tools
TROUBLESHOOTING Required Tools Meters = Need to Read • s t l – Test Leads: • Volts D/C – 600 • Needle Point • Ohms – 10k Megaohms. • 1000V/20A Rated 410a Gauge Manifold VPXWC with a 3’ Molex Whip Figure 702 (Troubleshooting Tools)
Page 158: Required Skills
TROUBLESHOOTING Required Skills 1. Patience – Revolutionary digital communicating technology has replaced older analog components. 2. Patience – Needle point leads will save you time when backprobing molex connectors. 3. Patience – Know who to call when you need help. 4.
Page 159: Troubleshooting Flowchart
TROUBLESHOOTING Troubleshooting Flowchart Verify smart at wall controller Conﬁrm ﬁrmware Check for diagnostic codes Active error code No error code Refer to Diagnostic Codes Abnormal board lights? Chart and Troubleshoot Voltage correct? accordingly Connectors plugged in and secure? Does a system reset resolve the issue? Rule out components Figure 702 (Troubleshooting Flowchart)
Page 160: Wall Controller Not "Smart
TROUBLESHOOTING Wall Controller Not “Smart” • “Smart” on the wall controller indicates proper communication with the VRP. • If this symbol is not lit, check the wiring for correct twisted pairs or broken wires.
Page 161: Verify Wall Controller Firmware
TROUBLESHOOTING Verify Wall Controller Firmware SYSTEM MODE SD CARD SLOT ENTER CHANGE TEST To read the Wall Controller firmware version, press the System Mode and Test buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 162: Verify Fmc Firmware
TROUBLESHOOTING Verify FMC Firmware FAN MODE SD CARD SLOT ENTER CHANGE TEST To read the FMC firmware version via the Wall Controller, press the Fan Mode and Test buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 163: Verify Mcs Firmware
TROUBLESHOOTING Verify MCS Firmware FAN MODE SD CARD SLOT ENTER CHANGE TEST To read the MCS firmware version via the Wall Controller, press the Fan Speed and Change buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 164: Check For Power
TROUBLESHOOTING Check For Power If the wall controller does not light up, ensure the unit has power. Check the electrical circuit breaker. Check the units disconnect. If in doubt, uncover the electrical panel from the unit and check that the processors on the motor control board are flashing green, not red.
Page 165: Diagnostic Code Check
TROUBLESHOOTING Diagnostic Code Check Is your WC blank? Ensure that the WC is wired properly and connected on the unit and the back of the WC You cannot check error codes on a bad WC, but you can utilize the FMC’s diagnostic lights as a secondary You can also connect a known good Wall Controller with a whip directly to the unit...
Page 166 TROUBLESHOOTING Diagnostic Code Check The FMC will have green lights, but if an error code occurs, a blue and/or red light will flash. The blue LED is the 10 digit and the red LED is the singles digit. For example, 4 blue flashes and 3 red flash would be a code 43.
Page 167: Diagnostic Code (Temperature Based)
TROUBLESHOOTING Diagnostic Code (Temperature Based) Temperature Based: Thermistors (sensors) modify VDC and is interpreted through the FMC. Errors indicate a possible issue with the sensor, FMC, or the sensor has detected an abnormal condition (or an out of parameter value). Solution: Sensor error, FMC error, or abnormal condition.
Page 168: Diagnostic Codes (Voltage/ Amperage)
TROUBLESHOOTING Diagnostic Codes (Voltage/ Amperage) Amperage (or Current) Diagnostic Codes The current sensing portion of the MCS had detected that the motor is pulling more than designed amperage. Grounded Motor Faulty/”Demagged” Motor Damaged MCS Board I2T (IPM Amperage) Faults The current sensing portion of the MCS had detected that the motor is pulling the maximum allowable amperage for an extended period of time.
Page 169: Voltage/Amperage Related Diagnostics -Odf Rule Out
TROUBLESHOOTING Voltage/Amperage Related Diagnostics –ODF Rule Out The Outdoor Fan Motor (ODF), like the Compressor, is a BLDC Motor. Troubleshooting this component is the same as the compressor. Ohm at the connector at the MCS first for the same resistance (+/‑0.1) across any two phases, then check each phase to ground.
Page 170: Configuration/Communication Diagnostic Codes
TROUBLESHOOTING Configuration/Communication Diagnostic Codes The FMC, MCS, Heater Board (HB), Wall Controller and Indoor Fan all communicate via ribbon cables. If communication is lost or dropped, the VRP will not operate. These codes will also populate when there is a software, firmware, or logic failure.
Page 171: Configuration/Communication Diagnostic Codes - 39 (Idf Comm Error)
TROUBLESHOOTING Configuration/Communication Diagnostic Codes – 39 (IDF Comm Error) IDF Layout: When checking communication, use the ground (blk) to reference all other pins in VDC: 3‑pin block – Power Red – L1 Grn – Ground Blue – L2 4‑Pin block – Communication Brn –...
Page 172: Diagnostic Codes
TROUBLESHOOTING Diagnostic Codes Diag Description Diagnostic Check point Solution Front panel switch is stuck If a button is stuck (on > 20 sec) 1. The AC line voltage is out of specification Input Voltage out of Specification 2. The AC line voltage is monitored by the PFC processor on the MCS board Ambient Indoor Air sensor (T8) is open or shorted...
Page 173 TROUBLESHOOTING Diagnostic Codes Diag Description Diagnostic Check point Solution This diagnostic test is used for testing and non‑critical analysis only Unit cycles (heat or cool demand) < 3 times per hour. The unit cycles heating or cooling demand less than 3 times within an hour 1.
Page 174 TROUBLESHOOTING Diag Description Diagnostic Check point Solution 1.Short on the MCS board 1.Short on the MCS board MCS Compressor Current Fault. 2. Improperly wired compressor 2. Improperly wired compressor The MCS board has flagged a current fault on the Compressor axis and notified the FMC 3.
Page 175 TROUBLESHOOTING Diagnostic Codes Diag Description Diagnostic Check point Solution MCS Compressor I2T Fault The problem occurred more than 5 times Power cycle the unit and see if the problem within an hour persists, if so: “The MCS board has flagged an Compressor I2T fault and has notified the FMC.”...
Page 176: Updating Vrp Firmware
UPDATING VRP FIRMWARE FMC Manual Update Process - Remove SD Card from FMC load on a PC or Laptop NOTE: Ensure Power is OFF! You will need an SD Card Reader to complete this step...
Page 177 UPDATING VRP FIRMWARE...
Page 178 UPDATING VRP FIRMWARE “xx” will be replaced by two numbers, indicating the software version. Example: 3.2.0.55 – Version 55 Open FMC Zip Folder Select all Files Copy to your SD Card Drive...
Page 179: Fmc Update Process - Loading New Firmware
UPDATING VRP FIRMWARE FMC Update Process – Loading new Firmware Insert SD Card into FMC and apply power. The FMC Firmware load will confirm by showing three green downward cascading LEDs:...
Page 180 UPDATING VRP FIRMWARE FAN MODE SD CARD SLOT ENTER CHANGE TEST To read the FMC firmware version via the Wall Controller, press the Fan Mode and Test buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 181 UPDATING VRP FIRMWARE Delete this file so that the SD card is empty. You can also “Format” the SD card. Ensure Power is OFF! You will need an SD Card Reader to complete this step...
Page 182 UPDATING VRP FIRMWARE Open zip file Copy to SD Card Verify the new AB_FW.s28 is the only file on the SD card and insert back into MCS...
Page 183 UPDATING VRP FIRMWARE FAN SPEED SD CARD SLOT ENTER CHANGE TEST To read the MCS firmware version via the Wall Controller, press the Fan Speed and Change buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 184 UPDATING VRP FIRMWARE Open zip file Copy to SD Card Insert into SD Card Slot...
Page 185 UPDATING VRP FIRMWARE FAN SPEED SD CARD SLOT ENTER CHANGE TEST To read the Wall Controller firmware version, press the System Mode and Test buttons together for 3 seconds. Your display screen will change to show 2 numbers. Press the down arrow to cycle through all version numbers.
Page 186 VRP Wall Controller Update Procedure UPDATING VRP FIRMWARE Introduction The Wall Controller (WC) can be updated via an SD card inserted into the card reader slot on versions 03.01.00.02 or higher. After inserting the associated SD Card, the WC update will initialize. The command takes 20-30 seconds to upload to the WC.
Page 187: Vrp Remote Upgrade Procedure
VRP Remote Upgrade Procedure Introduction The Remote Upgrade procedure on the Friedrich VRP system is designed to greatly reduce the amount of effort required in upgrading the system firmware. The procedure can upgrade the Friedrich Main Controller (FMC), Wall Controller (WC), and Motor Control System (MCS) boards. It is capable of upgrading just one board, all the boards at once, or any combination of any two boards.
Page 188 UPDATING VRP FIRMWARE VRP Remote Upgrade Procedure Starting Remote Upgrade To begin the procedure, ensure that the machine is on and in standby mode with “Smart” illuminated All that is required to start the Remote Upgrade procedure is to insert the “Remote Update” SD Card into the SD Card slot of the Wall Controller.
Page 189 UPDATING VRP FIRMWARE VRP Remote Upgrade Procedure There are two stages that will be displayed for the majority of the time. The first is while the WC is transferring files to the FMC, it will display a “6” and the Communication Icon will blink. This stage will last approximately 7-8 minutes.
Page 190 The SD Card is present but not good shape. Restart system and accessible. retry process. If unsuccessful, (FR_NOT_READY) try new Key Card. Contact Friedrich if problem persists. † An expected file is unable to be Try different Key Card. If located. problem persists, contact...
Page 191 UPDATING VRP FIRMWARE VRP Remote Upgrade Procedure (FR_NO_FILE) Friedrich. Undefined Parameter. System Cycle power to the unit and try failed in unexpected way that again. shouldn’t happen. FMC Errors Displayed Error Number Description Corrective Action Ensure the FMC SD Card is in FMC SD Card was removed.
Page 192 RU. Bad Processor A. Processor A is Reset system and retry. not in an appropriate state for Otherwise, contact Friedrich Remote Upgrade. Bad Processor B. Processor B is Reset system and retry. not in an appropriate state for Otherwise, contact Friedrich Remote Upgrade.
Page 193: Retrieving Vrp Data
UPDATING VRP FIRMWARE Retrieving VRP Data Remove SD Card from FMC and Locate “DF” Folder...
Page 194 UPDATING VRP FIRMWARE Retrieving VRP Data Right Click “Data.txt.” Send to: Compressed (zipped) folder...
Page 195 UPDATING VRP FIRMWARE Retrieving VRP Data Right Click “Data.ZIP.” Send to: Mail Recipient Email Data.ZIP to VRP_Support@Friedrich.com !! FILE SIZE WILL VARY !!
Page 196: Wiring Diagrams
WIRING DIAGRAMS 12-24K BTU (208/230V 7.5&10.0 KW) Figure 801 (Wiring Diagram)
Page 197: 12-24K Btu (208/230V 2.5, 3.4, & 5.0 Kw)
WIRING DIAGRAMS 12-24K BTU (208/230V 2.5, 3.4, & 5.0 KW) Figure 802 (Wiring Diagram)
Page 198: 12-24K Btu (265V 2.5, 3.4, & 5.0 Kw)
WIRING DIAGRAMS 12-24K BTU (265V 2.5, 3.4, & 5.0 kW) Figure 803 (Wiring Diagram)
Page 199: 12-24K Btu (265V 7.5 & 10 Kw)
WIRING DIAGRAMS 12-24K BTU (265V 7.5 & 10 kW) Figure 804 (Wiring Diagram)
Page 200: 36K Btu - 208/230V
WIRING DIAGRAMS 36K BTU - 208/230V Figure 805 (Wiring Diagram)
Page 201: Parts Catalog
PARTS CATALOG 12k Main Diagram 80081 80081 80083 80081 80080 80080 80081 80083 80083 80080 80080 80080 80081 80083 80083 80083 80083 80083 80080 80083 80080 80083 80080 60179 80080 80080 80083 60542 80080 80080 80080 80083 61028 80042 80083 80083 80083 80083...
Page 202 PARTS CATALOG 12k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80081013 EVAP. REAR PANEL VRP 12K‑R 80081005 EVAP. MOTOR MOUNT VRP 12K‑R 80083150 EVAP. BLOWER AND MOTOR VRP 12K‑R 80081002 EVAP. TOP PANEL VRP 12K‑R 80080177 FLANGE DISCHARGE VRP 3 SIDE VRP 12K‑R 80080181 FLANGE DISCHARGE VRP 1 SIDE...
Page 203 PARTS CATALOG 12k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80083474 REHEAT SOLENOID COIL 265V VRP 12K‑R 80112500 HIGH PRESSURE SWITCH VRP 12K‑R 80083340 LOW PRESSURE SWITCH VRP 12K‑R 25018305 REVERSING VALVE BODY VRP 12K‑R 25063605 REVERSING VALVE SOLENOID VRP 12K‑R COIL 25063705...
Page 204: 12K Control Box Diagram
PARTS CATALOG 12k Control Box Diagram Figure 902...
Page 205: 12K Control Box Diagram
PARTS CATALOG 12k Control Box Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80083312 TERMINAL BLOCK VRP 12K‑R 80083303 SOLID STATE RELAY VRP 12K‑R 62623500 HEATER BOARD VRP 12K‑R 62623300 MCS BOARD VRP 12K‑R 80082001 HEATER BOARD RIBBON CABLE VRP 12K‑R 80082003 MCS‑FMC RIBBON CABLE...
Page 206: 24K Main Diagram
PARTS CATALOG 24k Main Diagram SEE FIGURE 904 Figure 903...
Page 207 PARTS CATALOG 24k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80081013 EVAP. REAR PANEL VRP 24K‑R 80081005 EVAP. MOTOR MOUNT VRP 24K‑R 80083150 EVAP. MOTOR A N D BLOWER VRP 24K‑R 80081002 EVAP. TOP PA N EL VRP 24K‑R 80080177 FLANGE DISCHARGE 3 SIDED...
Page 208 PARTS CATALOG 24k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80080217 COND. MOTOR MOUNT VRP 24K‑R 80080139 COMPRESSOR 24K VRP 24K‑R 80083148 COMPRESSOR MOUN TING BOLT VRP 24K‑R 61028904 COMPRESSOR GROMMET VRP 24K‑R 25018705 REVERSING VALVE BODY VRP 24K‑R 25063605 REV.
Page 209: 24K Control Box Diagram
PARTS CATALOG 24k Control Box Diagram FIgure 904...
Page 210 PARTS CATALOG 24k Control Box Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80083312 TERMINAL BLOCK VRP 24K‑R 80083303 SOLID STATE RELAY VRP 24K‑R 62623500 HEATER BOARD VRP 24K‑R 62623300 MCS BOARD VRP 24K‑R 80082001 HEATER BOARD RIBBON CABLE VRP 24K‑R 80082003 MCS‑FMC RIBBON CABLE...
Page 211 PARTS CATALOG 36k Main Diagram SEE FIGURE 906 Figure 905...
Page 212 PARTS CATALOG 36k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80060003 ASSY INSUL WELDMENT VRP 36K‑R BASEPAN 80060129 WHEEL 4IN OD VRP 36K‑R 80060016 CORNERPOST RIGHT VRP 36K‑R 80060017 CORNERPOST LEFT VRP 36K‑R 80060044 ASSY INSUL PANEL SIDE RIGHT VRP 36K‑R 80060047 ASSY INSUL PANEL SIDE LEFT...
Page 213 PARTS CATALOG 36k Main Diagram ITEM PART PART DESCRIPTION USED ON MODEL NUMBER 80060055 MOUNT ELEC HEATER BOTTOM VRP 36K‑R 80080171 INLET RING VRP 36K‑R 80060125 ELECTRIC HEAT VRP 36K‑R 80060036 ASSY INSUL PANEL TOP VRP 36K‑R 80060086 ASSY INSULATED TOP ACCESS VRP 36K‑R PANEL 80060164...
Page 214 PARTS CATALOG 36k Control Box Diagram Figure 906...
Page 215 TAB#2‑14 62623500 VRP FRIEDRICH HEATER VRP 36K‑R 62623300 VRP MTR CNTRLLER SYSTEM VRP 36K‑R 62622000 VRP FRIEDRICH MAIN CNTRLLER VRP 36K‑R ‑ DO NOT SELL ‑ USE 62622001 TO SELL 61768500 CABLE GLAND M25X1.5 VRP 36K‑R 80083346 BUSHING SNAP POWER ACCESS VRP 36K‑R...
Page 216: Accessories
PARTS CATALOG Accessories ITEM PART NUMBER PART DESCRIPTION USED ON MODEL VRPXWPA‑8 Wall Plenum with VRPXALA for 4” VRP12 to 8” thick wall VRPXWPB‑8 Wall Plenum with VRPXALB for 4” VRP12, VRP24 to 8” thick wall VRPXWPA‑14 Wall Plenum for with VRPXALA for VRP12 8”...
Page 217: Accessories
ACCESSORIES Friedrich offers two types of control options for VRP units: - Standard Wall Controller (Wired), VRPXWC - Energy Management Wall Controller with an Occupancy Sensor - Wired, VRPXEMRT1(12k and 24k only), VRPXEMRT2 - Wireless, VRPXEMWRT1(12k and 24k only), VRPXEMWRT2...
Page 218 ACCESSORIES Accessories TYPE ITEM DESCRIPTION CHECK LIST WALL VRPXWCT Wall Controller CONTROLLER Required one per unit VRPXEMRT2 VRP Energy Management Wired Wall Controller with Occupancy Sensor Require One of the Controllers per unit VRPXEMWRT2 VRP Energy Management Wireless Wall Controller with Occupancy Sensor EMOCT Online Connection Kit –...
Page 219 ACCESSORIES Accessories ITEM DESCRIPTION QTY. CHECK LIST VRPXWPA-8 Wall Plenum for VRP12 with VRPXALA for 4” to 8” thick wall Require One of these Wall Plenums per unit VRPXWPB-8 Wall Plenum for VRP24 with VRPXALB up for 4” to 8” thick wall (Can also be used with VRP 12) VRPXWPA-14 Wall Plenum for VRP12 with VRPXALA for 8”...
Page 220 FRIEDRICH will repair or replace, at its option, any defective part without charge for the part. Replacement parts are warranted for the remainder of the original warranty period.
Page 221: Customer Satisfaction And Quality Assurance
CUSTOMER SATISFACTION and QUALITY ASSURANCE Friedrich is a conscientious manufacturer, concerned about customer satisfaction, product quality, and controlling warranty costs. As an Authorized Service Provider you play a vital role in these areas. By adhering to the policies and procedures you provide us with vital information on each warranty repair you complete. This information is used to...

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