Page 1: Table Of Contents
48LC WeatherExpert Series Single Package Rooftop Gas Heat/Electric Cooling Unit with Puronr (R ---410A) Refrigerant Size: 07 Installation Instructions NOTE: Read the entire instruction manual before starting Factory- - Option Thru- - Base Connections (Electrical Connections) ....the installation.
Page 2: Safety Considerations
W7220 Economizer Control ....safety- - alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or Base Unit Controls .
Page 3: Rated Indoor Airflow (Cfm)
WARNING WARNING PERSONAL INJURY AND ENVIRONMENTAL CARBON- - MONOXIDE POISONING HAZARD HAZARD Failure to follow instructions could result in severe Failure to follow this warning could cause personal personal injury or death due to carbon- - monoxide injury or death. poisoning, if combustion products infiltrate into the Relieve pressure and recover all refrigerant before building.
Page 4 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging 48 - Gas Heat Packaged Rooftop 0 = Standard 1 = LTL ® Model Series - WeatherExpert Electrical Options LC - Ultra High Efficiency A = None B = HACR Circuit Breaker Heat Options...
Page 5 C150085 Fig. 2 - - Unit Dimensional Drawing...
Page 6 C150086 Fig. 2 - - Unit Dimensional Drawing (cont)
Page 7: Installation
C13093 LOCATION DIMENSION CONDITION 48--- in (1219 mm) Unit disconnect is mounted on panel 18--- in (457 mm) No disconnect, convenience outlet option 18--- in (457) mm Recommended service clearance 12--- in (305 mm) Minimum clearance 42--- in (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall) 36--- in (914 mm) Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Page 8: Roof Mount
Although unit is weatherproof, avoid locations that permit Rig and place unit water from higher level runoff and overhangs to fall onto Install outdoor air hood the unit. Install flue hood Install gas piping Locate mechanical draft system flue assembly at least 4 ft (1.2 m) from any opening through which combustion Install condensate line trap and piping products could enter the building, and at least 4 ft (1.2 m)
Page 9 C13311 Fig. 4 - - Roof Curb Details...
Page 10: Slab Mount (Horizontal Units Only)
Curb should be level. This is necessary for unit drain to Insulate and weatherproof all external ductwork, joints, function properly. Unit leveling tolerances are shown in and roof openings with counter flashing and mastic in Fig. 5. Refer to Accessory Roof Curb Installation accordance with applicable codes.
Page 11: Positioning On Curb
CAUTION - NOTICE TO RIGGERS: AVERTISSEMENT - REMARQUE À L’ATTENTION DES MONTEURS ALL PANELS MUST BE IN PLACE WHEN RIGGING. TOUS LES CAPOTS DOIVENT ÊTRE EN PLACE AVANT LE LEVAGE • Hook rigging shackles through holes in base rail, as shown in Detail “A”. •...
Page 12: Step 8 - Install Outside Air Hood
3. Locate the (2) screws holding the metal tray to the basepan and remove. Locate and cut the (2) plastic tie- - wraps securing the assembly to the damper. (See Fig. 9.) Be careful to not damage any wiring or cut tie- - wraps securing any wiring.
Page 13: Step 9 - Install Flue Hood
Step 9 — Install Flue Hood Flue hood is shipped screwed to the basepan beside the PANEL burner compartment access panel. Remove from shipping location and using screws provided, install flue hood and INDOOR COIL screen in location shown in Fig. 13. ACCESS PANEL LEFT HOOD...
Page 14: Factory- - Option Thru- - Base Connections (Gas Connections)
Table 2 – Natural Gas Supply Line Pressure Ranges required). Consult accessory kit installation instructions for details on these installation methods. Observe UNIT MODEL UNIT SIZE clearance to gas line components per Fig. 14. 4.0 in. wg 13.0 in. wg 48LCD/E/S/R0 (996 Pa) (3240 Pa)
Page 15 9” (229mm) min Burner Access Panel Union Thru-Curb Adapter BRASS FITTING SUPPORT EMBOSSMENT FOR 3-6 TON UNITS BRACKET C13411 Fig. 16 - - Gas Line Piping for 6 Ton Units Unit Base Rail Other hardware required to complete the installation of the gas supply line will include a manual shutoff valve, a sediment trap (drip leg) and a ground- - joint union.
Page 16: Step 11 - Install External Condensate Trap And Line
4. Pressure- - test all gas piping in accordance with local Step 11 — Install External Condensate Trap and and national plumbing and gas codes before connect- Line ing piping to unit. The unit has one -in. condensate drain connection on NOTE: Pressure test the gas supply system after the gas the end of the condensate pan and an alternate connection supply piping is connected to the gas valve.
Page 17: Step 12 - Make Electrical Connections
Step 12 — Make Electrical Connections Units Without Disconnect or HACR Option WARNING Equip GR Lug ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Disconnect Do not use gas piping as an electrical ground. Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of Ground...
Page 18 a48--- 9323 Fig. 25 - - 48LC 07 Electro- - mechanical Control Wiring Diagram...
Page 19 a48--- 9324 Fig. 26 - - 48LC 07 RTU Open Control Wiring Diagram...
Page 20 a48--- 9318 Fig. 27 - - 48LC 07 SystemVut Control Wiring Diagram...
Page 21 a48--- 9325 Fig. 28 - - 48LC 07 Power Wiring Diagram, Electro- - mechanical and RTU Open Controls, 208/230V and 460V Units...
Page 22 a48--- 9326 Fig. 29 - - 48LC 07 Power Wiring, Electro- - mechanical and RTU Open Controls, Diagram, 575V Units...
Page 23 a48--- 9327 Fig. 30 - - 48LC 07 Power Wiring Diagram, SystemVut Control, 208/230V and 460V Units...
Page 24 a48--- 9328 Fig. 31 - - 48LC 07 Power Wiring, SystemVut Control, Diagram, 575V Units...
Page 25: Units With Factory- - Installed
Units With Factory- - Installed Non- - Fused Disconnect or HACR — The factory- - installed optional non- - fused disconnect (NFD) or HACR switch is located in a weatherproof enclosure located under the main control box. The manual switch handle and shaft is shipped in the disconnect or HACR enclosure.
Page 26: Units Without Factory- - Installed
Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. NOTE: Check all factory and field electrical connections for tightness. Convenience Outlets —...
Page 27 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 28: Hacr
If field- - installed accessories are added or changed in the field (i.e. power exhaust, etc.), the HACR may no longer Install a Carrier- - approved accessory thermostat according be of the proper amp rating and therefore will need to be to installation instructions included with the accessory.
Page 29: Unit Without Thru- - Base Connection Kit
Fig. 43 - - Accessory Field- - Installed Humidistat HOLE IN END PANEL (HIDDEN) NOTE: 48LC**07 units require a 3--stage cooling C08027 thermostat device and are not compatible with Carrier’s Fig. 42 - - Field Control Wiring Raceway Edge Pro thermidistat. RTU Open Controller (Factory- -Installed Option)
Page 30: 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 31: Cooling
Table 6 – 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 32: Low Ambient Cooling Operation Down To 40_F (4_C)
will begin to operate. As the CO level in the zone Table 7 – Low Ambient Temperature Outdoor Fan Control increases above the CO set- - point, the minimum position No. of No. of Outdoor Fan LC Size Switch of the damper will be increased proportionally. As the Fans On Fans Off Select Switch...
Page 33: 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 07 units.
Page 34: 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 35 Table 8 - - Menu Structure (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value STATUS RA TEMP nn_F (or _C) 0 to 140_F RETURN AIR TEMPERATURE (cont) ( ---18 to 60_C) (Accessory sensor required) Displays measured value of return air temperature from RAT sensor.
Page 36 Table 8 - - Menu Structure (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value SETPOINTS 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 damper to increment by 1 maintain the mixed air temperature.
Page 37 Table 8 - - Menu Structure* (cont) Parameter Parameter EXPANDED PARAMETER NAME Menu Parameter Default Range and Increment Notes Value SYSTEM INSTALL 01/01/10 Display order = MM/DD/YY SETUP Setting order = DD, MM, then YY . UNITS DEG _F or _C Sets economizer controller in degrees Fahrenheit or Celsius.
Page 38 Table 8 - - 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 39: Connections And Applications
Connections and Applications W7220 Economizer Module Wiring — Use Fig. 49 and Tables 9 and 10 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 40: Economizer Control 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 41 The W7220 calculates the enthalpy and dew point using Fig. 52 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 42: 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 43: 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 44: Hardware
Hardware Table 13 – 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 45: Operating Sequences
Table 16 – Supply Fan Speed Logic without Economizer 51/64 (21) T’STAT 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 46 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 47: Heating With Economi$Er
Table 18 – W7220 Input/Output with Demand Controlled Ventilation (DCV) INPUTS OUTPUTS Occupancy Ref: DEMAND OUTSIDE AIR Mechanical Cooling Stage FAN SPD* OCC Yes OCC No CONTROLLED Good to Y1--- I Y2--- I VENTILATION economize? Y1--- O/1ST Y2--- O/2ND Outside Air Damper Position 0--- v/Off 0--- v/Off VENTMIN L...
Page 48: Demand Controlled Ventilation
Demand Controlled Ventilation — Setup and configuration involves stepping through three menus and enabling required functions and re- - selecting If a space or return air CO sensor is connected to the setpoints to meet project requirements. The menus used EconoMi$er X control, a Demand Controlled Ventilation are SYSTEM SETUP, ADV SETUP and SETPOINTS.
Page 49: 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 50 Table 19 – 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 51 a48--- 9322 Fig. 57 - - Typical EconoMi$er X Wiring Diagram...
Page 52: 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 53 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 54: Staged Air Volume (Savt) With Variable Frequency Drive
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 38).
Page 55: Multi- -Speed Vfd Display Kit
Multi- -Speed VFD Display Kit (Field- -Installed Accessory) NOTE: The Remote VFD Keypad is part of the Multi- - Speed VFD display kit (PN: CRDISKIT002A00) which is a field- - installed accessory. It is not included with the 48LC 07 base unit. The VFD keypad as shown in Fig.
Page 56: Connecting The Keypad To The Vfd
Navigation Keys and Status LEDs: The Navigation keys and Status LEDs are detailed in the following table. Com. Warn. Alarm C13114 Com. LED: Flashes when bus communications is communicating. Green LED/On: Control selection is working. Yellow LED/Warn.: Indicates a warning. Flashing Red LED/Alarm: Indicates an alarm.
Page 57: Program The Vfd For 3 Discrete Indoor Fan Speeds
To program the VFD for 3 discreet indoor fan motor Male Connector - connect to VFD speeds: Front Panel 1. At Power- - Up: At the first power up the LCD displays the Select Language screen. The default setting is English. To change the language, press the OK key and use the Y and B keys to scroll to the desired language and then press OK.
Page 58 d. Press B(Down Arrow) once to highlight the bot- e. Press OK, the following display appears - - tom row and press OK. The display changes to - - 1-20 Motor Power 5--- 10 Terminal 18 Digital In… [9] 1.5kW --- 2 hp [8] Start NOTE: The number in the bracket may be different from e.
Page 59 c. Press OK, the display changes to - - p. Press OK, the following display appears - - 1--- 0* General Settings 1-90 Motor Thermal Prote… 1--- 1* Motor Selection [4] ETR trip 1 d. Press B(Down Arrow) until the following display q.
Page 60 d. Press OK again, the following display appears - - [0]0.00% Stop 4-10 Motor Speed Direction [1]LL.LL% Low Speed (see Table column labeled “Preset References 3--- 10[1]” [2] Both Directions for the proper % for each unit) e. Press B(Down Arrow) once, the following [2]MM.MM% Medium Speed (see Table column...
Page 61 f. Press B(Down Arrow) again. The following b. Press B(Down Arrow) until the following display display appears - - appears - - 5-12 Terminal 27 Digital In… 13--- ** Smart Logic [17] Preset ref bit 1 14--- ** Special Functions g.
Page 64: Smoke Detectors
Legend and Notes for Tables 21 and 22 the Integrated Staging Control (ISC) board may be necessary to complete the unit and smoke detector configuration to LEGEND: BRKR Circuit breaker meet project requirements. C.O. Convenience outlet DISC. Disconnect Units equipped with factory- - optional Return Air smoke Full load amps Locked rotor amps detectors require a relocation of the sensor module at unit...
Page 65: Step 13 - Adjust Factory- -Installed Options
Step 13 — Adjust Factory- -Installed Options Refer to separate installation instructions for information on installing these accessories. See Price Pages for a Smoke Detectors — complete list of field- - installed accessories. Smoke detector(s) will be connected at the Integrated Step 15 —...
Page 66 Adjust belt tension by loosing the motor mounting plate — Pre- - Start and Start- - Up front bolts and rear bolt (see Fig. 68) and sliding the plate This completes the mechanical installation of the unit. towards the fan (to reduce tension) or away from the fan Refer to the unit’s Service Manual for detailed Pre- - Start (to increase tension).
Page 67: 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 68 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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