Page 1: Table Of Contents
48LC WeatherExpert Series Single Package Rooftop Gas Heat/Electric Cooling Unit with Puronr (R ---410A) Refrigerant Sizes: 14, 17, 20, 24, 26 Installation Instructions NOTE: Read the entire instruction manual before starting HACR ........the installation.
Page 2: Safety Considerations
Hardware ....... . . product. Refer to the individual instructions packaged with the kits or accessories when installing.
Page 3 WARNING WARNING  FIRE HAZARD UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could result in personal Failure to follow this warning could cause personal injury, death, and/or property damage. injury, death and/or equipment damage. Manifold pressure tap set screw must be tightened and Puronr (R- - 410A) refrigerant systems operate at in.
Page 4: Rated Indoor Airflow (Cfm)
Rated Indoor Airflow (cfm) Model Number Full Load Airflow (cfm) 48LC**14 4375 The table to the right lists the rated indoor airflow used 48LC**17 4875 for the AHRI efficiency rating for the units covered in this 48LC**20 5690 document. 48LC**24 6500 48LC**26 7500...
Page 5 C13057 Fig. 2 - - Unit Dimensional Drawing – 14 Size Unit, Sheet 1 of 3...
Page 6 C13058 Fig. 2 (cont) - - Unit Dimensional Drawing – 14 Size Unit, Sheet 2 of 3...
Page 7 C13059 Fig. 2 (cont) - - Unit Dimensional Drawing – 14 Size Unit, Sheet 3 of 3...
Page 8 C13032 Fig. 3 - - Unit Dimensional Drawing – 17 and 20 Size Units, Sheet 1 of 3...
Page 9 C13033 Fig. 3 (cont) - - Unit Dimensional Drawing – 17 and 20 Size Units, Sheet 2 of 3...
Page 10 C13034 Fig. 3 (cont) - - Unit Dimensional Drawing – 17 and 20 Size Units, Sheet 3 of 3...
Page 11 C14106 Fig. 4 - - Unit Dimensional Drawing – 24 and 26 Size Units, Sheet 1 of 3...
Page 12 C14107 Fig. 4 (cont) - - Unit Dimensional Drawing – 24 and 26 Size Units, Sheet 2 of 3...
Page 13 C14108 Fig. 4 (cont) - - Unit Dimensional Drawing – 24 and 26 Size Units, Sheet 3 of 3...
Page 14 C12384 LOCATION DIMENSION CONDITION 36---in (914 mm) • Recommended clearance for air flow and service 42---in (1067 mm) • Recommended clearance for air flow and service • No Convenience Outlet 18---in (457 mm) • No Economizer • No field --- installed disconnect on economizer hood side (Factory--- installed disconnect installed). •...
Page 15: Installation
INSTALLATION Step 2 — Plan for Sequence of Unit Installation The support method used for this unit will dictate different Jobsite Survey sequences for the steps of unit installation. For example, on Complete the following checks before installation. curb- - mounted units, some accessories must be installed on the unit before the unit is placed on the curb.
Page 16: Step 4 - Provide Unit Support
Step 4 — Provide Unit Support box area of access panel; see Fig. 2, 3, or 4 for basepan knockout locations for location. Attach the service Roof Curb Mount — connections to the basepan. Accessory roof curb details and dimensions are shown in Hood Carton Location Fig.
Page 17 C13054 Fig. 8 - - Roof Curb Details – 14 Size Unit...
Page 18 C13055 Fig. 9 - - Roof Curb Details – 17 and 20 Size Units...
Page 19 C13056 Fig. 10 - - Roof Curb Details – 24 and 26 Size Units...
Page 20: Step 5 - Field Fabricate Ductwork
Step 5 — Field Fabricate Ductwork Step 6 — Rig and Place Unit Cabinet return-air static pressure (a negative condition) Keep unit upright and do not drop. Spreader bars are not shall not exceed 0.5 in. wg (87 Pa) with economizer or required if top crating is left on unit.
Page 21: Positioning On Curb
Positioning on Curb — Field- - supplied - - inch) flanges should be attached to horizontal duct openings (see Fig. 12) and all ductwork Position unit on roof curb so that the following clearances should be secured to the flanges. Insulate and weatherproof are maintained: in.
Page 22: Step 9 - Install Flue Hood And Combustion Air Hood
To assemble the outside air hood: Step 9 — Install Flue Hood and Combustion Air Hood 1. Remove hood top panel from shipping position on unit end. The flue hood is shipped screwed to the fan deck inside 2. Install four angles to the upper end panel using the the burner compartment.
Page 23: Step 10 - Install Gas Piping
Step 10 — Install Gas Piping Table 2 – Typical - - in. NPT Field Supplied Piping Parts Item Description Installation of the gas piping must be in accordance with 90 Deg Street Elbow local building codes and with applicable national codes. 5 Inch Long Nipple In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Ground---Joint Union...
Page 24: Factory- - Option Thru- - Base Connections
Manifold pressure for liquid propane (LP) fuel must be connector for low voltage wiring. If non- - unit powered adjusted to specified range. Follow instructions in the convenience outlet is being utilized, remove the - - in. accessory kit to make initial readjustment. (22mm) knockout and utilize appropriate connector for 115 volt line.
Page 25: Step 11 - Install External Condensate Trap And Line
The piping for the condensate drain and external trap can WARNING be completed after the unit is in place. Hand tighten fittings to the drain pan fitting. Provide adequate support FIRE OR EXPLOSION HAZARD for the drain line. Failure to do so can result in damage to the drain pan.
Page 26 disconnect. (Check with local codes to ensure this method label for control box component arrangement) or at is acceptable in your area.) If a de- - energize via unit factory- - installed option non- - fused disconnect switch or disconnect switch operation of the convenience outlet is HACR breaker.
Page 27 a48--- 9336 Fig. 26 - - 48LC 14- - 26 Electro- - mechanical Control Wiring Diagram...
Page 28 a48--- 9337 Fig. 27 - - 48LC 14- - 26 RTU Open Control Wiring Diagram...
Page 29 a48--- 9338 Fig. 28 - - 48LC 14- - 26 SystemVut Control Wiring Diagram...
Page 30 C14112 Fig. 29 - - Typical Power Wiring Diagram, Electro- - mechanical and RTU Open Controls, 48LC 14- - 20 208/230V Shown...
Page 31 a48--- 9339 Fig. 30 - - Typical Power Wiring Diagram, SystemVut Controls, 48LC 26 208/230V Shown...
Page 32: Units Without Factory- - Installed
Units Without Factory- - Installed Non- - Fused Disconnect or HACR — When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes.
Page 33: All Units
Maximum wire size is 2/0 AWG per pole. imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate Units Without Disconnect or HACR Option any applicable Carrier warranty. Equip GR Lug Convenience Outlets — WARNING...
Page 34: Hacr
Loosen the two screws at the GFCI duplex outlet, until Code Article 210, Branch Circuits, for use of convenience approximately -in. (13 mm) under screw heads are outlets. exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket;...
Page 35: Factory- - Option Thru- - Base Connections
Thermostat — 2-stage heating thermostats; it can be configured for other thermostat types. Field Wiring Install a Carrier- - approved accessory 3- - stage thermostat a48--- 9346 according to installation instructions included with the Fig. 39 - - Typical Low- - Voltage Control Connections accessory.
Page 36: Heat Anticipator Settings
NOTE: Heat Anticipator Settings — If utilizing the through the base connections, route the low voltage wire through the wire ties to the Set heat anticipator settings at 0.14 amp for the first stage Integrated Staging Control (ISC) board (see Fig. 40). and 0.14 amp for second- - stage heating.
Page 37: Humidi- -Mizer R System Control Connections
Humidity Sensor (33ZCSENDRH- - 01). C09295 Fig. 41 - - Accessory Field- - Installed Humidistat NOTE: 48LC**014 - - 26 units require a 3- - stage cooling thermostat device and are not compatible with Carrier’s Edge Pro thermidistat. Humidistat C14113...
Page 38: Integrated Staging Control (Isc) Board
In the case of the RTU Open option, The Carrier Integrated Staging Control (ISC) is intended the RTU Open controller provides the signal which is for use with a standard thermostat or direct digital controls passed thru the ISC board to the Smoke Alarm terminal.
Page 39: Cooling
Table 7 – Status Code Descriptions for ISC Board LEDs LED INDICATION ERROR# ERROR NAME LED01 LED02 LED03 LED04 LED05 Check Smoke Detector/PMR/AUX Check HPS/LPS/COFS Call for Y3 with no call for Y1. Check Y1 wiring. Call for Y3 with no call for Y1/Y2. Check Y1 wiring. Call for Y2 with no call for Y1.
Page 40: Low Ambient Cooling Operation Down To 40_F (4_C)
In field- - installed accessory CO sensors are connected to Table 8 – Low Ambient Temperature Outdoor Fan Control the Economizer, a demand controlled ventilation strategy No. of No. of Outdoor Fan LC Size Switch will begin to operate. As the CO level in the zone Fans On Fans Off...
Page 41: Economi$Er R X (Factory- - Installed Option)
EconoMi$er X (Factory- - Installed Option) The W7220 control module includes an integral user interface with keypad and LCD display that permits direct EconoMi$er X is an economizer system which is available input of setpoint values and configurations and display of for 48LC 14- - 26 units.
Page 42: Menu Structure
Using the Keypad with Settings and Parameters 9. Press the (Enter) button to return to the current menu parameter. To use the keypad when working with Setpoints, System 10. Press the (Menu Up/Exit) button to return to the and Advanced Settings, Checkout tests and Alarms: previous menu.
Page 43 Table 9 - - Menu Structure* (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value STATUS RA HUM 0 to 100% RETURN AIR RELATIVE HUMIDITY (cont) (Accessory enthalpy sensor required) Displays measured value of return air humidity from RA sensor. IN CO2 ___ppm 0 to 2000 ppm...
Page 44 Table 9 - - Menu Structure* (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value SETPOINTS EXH2 L SET 0 to 100%; EXHAUST FAN STAGE 2 SETPOINT AT LOW SPEED (cont) Increment by 1 Setpoint for OA damper position when exhaust fan1 is powered by the economizer.
Page 45 Table 9 - - Menu Structure* (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value CHECKOUT DAMPER VMIN .HS Positions OA damper to VMIN High Speed position DAMPER VMAX .HS Positions OA damper to VMAX High Speed position DAMPER OPEN Positions OA damper to the full open position.
Page 46: Connections And Applications
Connections and Applications W7220 Economizer Module Wiring — Use Fig. 47 and Tables 10 and 11 to locate the wiring terminals for the Economizer module. W7220 Controller NOTE: The bottom 4 Pin actuator header is not used Left Terminal Right Terminal Block Label Block Label C14156...
Page 47: Economizer Controlled Configurations
20-K OHM PNO HH79NZ007 TSTAT W1 AUX2-I 20-K OHM OCCUPANCY --- TSTAT G PNO HH79NZ007 W7220 GROUND E- GND GRN/YEL S - BUS CONTROLLER EXH 1 POWER EXHAUST RELAY S - BUS AUX1-O IAQ - 2 - 10 SENSOR IAQ COM Y2 - I TSTAT Y3 IAQ 24V+...
Page 48 The W7220 calculates the enthalpy and dew point using Fig. 50 shows the 5 current boundaries. There is also a the OA temperature and humidity input from the OA high limit boundary for differential enthalpy. The high enthalpy sensor. When the OA temperature, OA humidity limit boundary is ES1 when there are no stages of and OA dew point are all below the selected boundary, the mechanical cooling energized and HL (high limit) when a...
Page 49: Demand Controlled Ventilation
Demand Controlled Ventilation — should be set to an economizer position that brings in enough fresh air to remove contaminants and CO Demand Controlled Ventilation (DCV) function requires a generated by sources other than people; this airflow rate is space air CO sensor be connected to the W7220 designated Va.
Page 50: Economizer Occupancy Control
To determine the damper setpoint position, perform the When determining VENTMIN setpoints, substitute the following procedure for each condition setpoint, with value for Va in place of Vbz in the formula. mechanical cooling OFF: DCV Setpoint: The SETPOINTS parameter DCV SET Calculate the appropriate supply air temperature using the defines the space CO level above which the DCV mode...
Page 51: Hardware
Hardware Table 14 – SAT/OAT Sensor Characteristics Deg C Ohms Deg F Ohms Actuators — --- 30 415156 --- 20 386130 The EconoMi$er X damper actuators are direct- - coupled --- 25 301540 193070 types with spring- - return. Power is 24- - v from the W7220 --- 20 221210 101820...
Page 52: Operating Sequences
Table 17 – Supply Fan Speed Logic without Economizer 51/64 (21) TSTAT OUTPUT G/OCC 0--- V 24---V 0--- V 0--- V 4-1/4 (108) 0--- V 24---V 0--- V 0--- V 0--- V 0--- V 24---V 0--- V 2-3/4 (70) 0--- V 0--- V 0--- V 24---V...
Page 53 The supply fan motor will continue to run in Low Speed. outdoor enthalpy, differential dry bulb or differential W7220 input OCC remains energized; the outside air enthalpy), a space thermostat call for Stage 1 Cooling damper remains in MIN POS L. If ISC terminal G is also energizes ISC terminals G and Y1;...
Page 54: Heating With Economi$Er
Table 19 – W7220 Input/Output with Demand Controlled Ventilation (DCV) INPUTS OUTPUTS Occupancy Ref: DEMAND OUTSIDE AIR Mechanical Cooling Stage FAN SPD* OCC Yes OCC No CONTROLLED Good to Y1--- I Y2--- I VENTILATION economize? Y1--- O/1ST Y2--- O/2ND Outside Air Damper Position 0--- v/Off 0--- v/Off VENTMIN L...
Page 55: Demand Controlled Ventilation
Demand Controlled Ventilation — Setup and configuration involves stepping through three menus and enabling required functions and re- - selecting If a space or return air CO sensor is connected to the setpoints to meet project requirements. The menus used EconoMi$er X control, a Demand Controlled Ventilation are SYSTEM SETUP, ADV SETUP and SETPOINTS.
Page 56: Status
To perform a Checkout test: Troubleshooting 1. Scroll to the desired test in the Checkout menu using Power Up Delay— the the buttons. 2. Press the button to select the item. Upon power up (or after a power outage or brownout) the 3.
Page 57 Table 20 – Operating Issues and Concerns Issue or Concern Possible Cause and Remedy My outdoor temperature reading on Check the sensor wiring: the STATUS menu is not accurate. • Enthalpy sensors are to be wired to the S--- Bus terminals. •...
Page 58 a48--- 9340 Fig. 55 - - Typical EconoMi$er X Wiring Diagram...
Page 59: Control Set Point And Configuration Log
CONTROL SET POINT AND CONFIGURATION LOG Project Name/Location: Model Number: Serial Number: Date: Technician Menu Tables: 1. SYSTEM SETUP 2. ADVANCED SETUP 3. SETPOINTS Menu 1: System Setup Parameter Project Parameter Parameter Default Notes Value Range and Increment Value INSTALL 01/01/10 Display order = MM/DD/YY Setting order = DD, MM, then YY...
Page 60 Menu 2: Advanced Setup Parameter Project Parameter Default Parameter Notes Value Range and Increment Value MA LO SET 45_F (7_C) 35 to 55_F; SUPPLY AIR TEMPERATURE LOW LIMIT (2 to 13_C) Temperature to achieve Freeze Protection (close damper and alarm if incremented by 1_ temperature at SAT location falls below setup value) FREEZE POS...
Page 61 Menu 3: Setpoints Parameter Project Parameter Default Parameter Notes Value Range and Increment Value MAT SET 53_F 38 to 65_F; SUPPLY AIR SETPOINT (12_C) (3 to 18_C) Setpoint determines where the economizer will modulate the OA increment by 1_ damper to maintain the supply air temperature. See Menu Note 2 (on page 45).
Page 62: Staged Air Volume (Savt) With Variable Frequency Drive
Staged Air Volume (SAVt) with Variable Frequency Drive The Staged Air Volume (SAV) system utilizes a Variable Frequency Drive (VFD) to automatically adjust the indoor fan motor speed in sequence with the unit’s ventilation, cooling and heating operation. Per ASHRAE 90.1- - 2016 standard during the first stage of cooling operation the SAV system will adjust the fan motor to provide 66% of the design airflow rate for the unit.
Page 63: Multi- -Speed Vfd Display Kit (Field- - Installed Accessory)
Multi- -Speed VFD Display Kit Navigation Keys and Status LEDs: The Navigation keys and Status LEDs are detailed in the following table. (Field- - Installed Accessory) NOTE: The Remote VFD Keypad is part of the Com. Multi- - Speed VFD display kit (PN: CRDISKIT002A00) which is a field- - installed accessory.
Page 64: Program The Vfd For 3 Discrete Indoor Fan Speeds
Connecting the Keypad Directly to the VFD — Male Connector - connect to VFD 1. Place the bottom of the VFD keypad into the variable Front Panel frequency drive as shown in Fig. 59. C13116 Fig. 59 - - Align Bottom of VFD Keypad with Opening in VFD Front Panel 2.
Page 65 change the language, press the OK key and use the Y 3. Clearing Alarm 060: External Interlock: and B keys to scroll to the desired language and then a. Press the Menu key twice to position the B(tri- press OK. angle icon) over Main Menu;...
Page 66 5. Entering Motor Data: m. Press B(Down Arrow) once to display the following - - a. Press the Menu key to move the B(triangle icon) so it is positioned over Main Menu. The 1-25 Motor Nominal Speed display show the following - - 1740rpm 0--- ** Operation / Display n.
Page 67 l. Press B(Down Arrow) once, the following f. Press the Back key until the following display display appears - - appears - - 1-82 Min Speed for Functio… 3--- 0* Reference Limits 1.0 Hz 3--- 1* References m. Press OK to highlight the number and then use g.
Page 68 f. Press OK again to highlight the bottom row and 10. Setting Digital Inputs: use the Y and B (Up and Down Arrow) keys to a. Press the Back key until the following display select 10.00s. Press OK again to set the selected appears - - Ramp Down Time.
Page 69 d. Press B(Down Arrow) once to move the high- e. Press OK, the following display appears - - light to the bottom row and then press OK. The 14-20 Reset Mode following display appears - - [0] Manual reset 6-10 Terminal 53 Low Voltage f.
Page 79 Legend and Notes for Tables 26 and 27 LEGEND: Example: Supply voltage is 230-3-60 BRKR Circuit breaker C.O. Convenience outlet AB = 224 v DISC. Disconnect BC = 231 v Full load amps AC = 226 v Locked rotor amps Minimum circuit amps P .E.
Page 80: Smoke Detectors
Smoke Detectors Return Air Sampling Tube (Shipping Location) Smoke detectors are available as factory- - installed options on 48LC 14- - 26 models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer or in combination of Supply Air and Return Air.
Page 81: Step 14 - Check Belt Tension
Step 14 — Check Belt Tension 2. Set the tension gauge to the desired tension (see Table 1 in Fig. 66). Place the large O- - ring at that point. Measure the belt span length as shown in Fig. 66. 3.
Page 82 BLOWER PULLEY V-BELT MOTOR PULLEY MOTOR MOUNTING MOTOR MOUNTING BOLTS (4) PLATE C11504 Fig. 67 - - Belt Drive Motor Mounting Pre- - Start and Start- - Up This completes the mechanical installation of the unit. Refer to the unit’s Service and Maintenance manual for detailed Pre- - Start and Start- - up instructions.
Page 83: Unit Start- - Up Checklist
UNIT START-UP CHECKLIST (Remove and Store in Job File) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start---up checklist, use good judgement, follow safe practices, and adhere to the safety considerations/information as outlined in the preceding sections of this Installation Instructions document.
Page 84 GENERAL j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS (IF EQUIPPED) j VERIFY SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST III. HUMIDI- -MIZER SYSTEM START-UP NOTE: Units equipped with either SystemVut or RTU- - Open controls have Service Test menus or modes that can assist with the Humidi- - MiZer System Start- - Up function and provide the means to make the observations listed for this start- - up.

Carrier WeatherExpert 48LC Installation Instructions Manual

Theinstallation.

Safety Considerations

Installation

Integrated Staging Control (ISC) Board

Economi$Er R X (Factory- - Installed Option)

Unit Start- - up Checklist

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