Carrier 48LC Installation Instructions Manual
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Carrier 48LC Installation Instructions Manual

Carrier 48LC Installation Instructions Manual

Single package rooftop gas heating/electric cooling unit with puronr (r---410a) refrigerant size: 07
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48LC
Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puronr (R---410A) Refrigerant
Size: 07
NOTE: Read the entire instruction manual before starting
the installation

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Summary of Contents for Carrier 48LC

  • Page 1: Table Of Contents

    48LC Single Package Rooftop Gas Heating/Electric Cooling Unit with Puronr (R---410A) Refrigerant Size: 07 Installation Instructions NOTE: Read the entire instruction manual before starting Units Without Factory- - Installed the installation Non- - Fused Disconnect or HACR ... . .

  • Page 2: Safety Considerations

    Actuators ....... . thoroughly and follow all warnings or cautions attached to the unit.

  • Page 3: Rated Indoor Airflow (Cfm)

    Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard R = Cu/Cu - Al/Cu — Louvered Hail Guard S = Cu/Cu - Cu/Cu — Louvered Hail Guard C13688 Fig. 1 - - 48LC 07 Model Number Nomenclature (Example)
  • Page 4 C13312 Fig. 2 - - Unit Dimensional Drawing...
  • Page 5 C13313 Fig. 2 - - Unit Dimensional Drawing (cont.)
  • Page 6 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 7: Installation

    INSTALLATION Table 1 – Operating Weights Jobsite Survey 48LC**07 UNITS LB (KG) Base Unit 1090 (495) Complete the following checks before installation. Economizer 1. Consult local building codes and the NEC (National Vertical 75 (34) Electrical Code) ANSI/NFPA 70 for special installation...

  • Page 8: Step 3 - Inspect Unit

    Step 3 — Inspect Unit Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and Inspect unit for transportation damage. File any claim not to the unit. The accessory thru- - the- - base power and with transportation agency.
  • Page 9 C13311 Fig. 5 - - Roof Curb Details...

  • Page 10: Alternate Unit Support (In Lieu Of Curb Or Slab Mount)

    Alternate Unit Support When using the standard side drain connection, ensure the (In Lieu of Curb or Slab Mount) — red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can A non- - combustible sleeper rail can be used in the unit curb be tightened with a - - in.

  • Page 11: Step 7 - - Convert To Horizontal And Connect Ductwork

    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

    Step 8 — Install Outside Air Hood 4. Carefully lift the hood assembly (with metal tray) through the filter access opening and assemble per the Economizer Hood Package Removal and Setup - - steps outlined in Economizer Hood, below. Factory Option Economizer Hood —...

  • Page 13: Step 9 - Install Flue Hood

    5. Open the filter clips which are located underneath the This unit is factory equipped for use with Natural Gas fuel hood top. Insert the aluminum filter into the bottom at elevations up to 2000 ft (610 m) above sea level. Unit filter rack (hood divider).

  • Page 14: Factory- - Option Thru- - Base Connections (Gas Connections)

    The gas supply line can approach the unit in three ways: Install a - - in NPT street elbow on the thru- - base gas horizontally from outside the unit (across the roof), fitting. Attach a - - in pipe nipple with minimum length thru- - curb/under unit basepan (accessory kit required) or of 16- - in (406 mm) (field- - supplied) to the street elbow through unit basepan (factory- - option or accessory kit...
  • Page 15 4. Pressure- - test all gas piping in accordance with local and national plumbing and gas codes before connect- ing piping to unit. 9” (229mm) min NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply Burner piping must be disconnected from the gas valve during the Access...

  • Page 16: Step 11 - Install External Condensate Trap & Line

    Step 11 — Install External Condensate Trap & Line Step 12 — Make Electrical Connections The unit has one -in. condensate drain connection on WARNING the end of the condensate pan and an alternate connection on the bottom. See Fig. 21. Unit airflow configuration ELECTRICAL SHOCK HAZARD does not determine which drain connection to use.
  • Page 17 C13682 Fig. 23 - - 48LC 07 Control Wiring Diagram...
  • Page 18 C13671 Fig. 24 - - 48LC 07 RTU Open Control Wiring Diagram...
  • Page 19 C13672 Fig. 25 - - 48LC 07 Power Wiring Diagram, 208/230V and 460V Units...
  • Page 20 C13675 Fig. 26 - - 48LC 07 Power Wiring Diagram, 575V Units...

  • Page 21: Units With Factory- - Installed

    WARNING FIRE HAZARD Failure to follow this warning could result in intermittent operation or performance satisfaction. Do not connect aluminum wire between disconnect switch and 48LC unit. Use only copper wire. (See Fig. 28.) ELECTRIC C12278 DISCONNECT Fig. 29 - - Location of Non- - Fused Disconnect Enclosure...

  • Page 22: Units Without Factory- - Installed

    20, Note 2 (see page 60) to determine the percent of voltage imbalance. 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. C12281...

  • Page 23: Convenience Outlets

    Locate its disconnect switch, if appropriate, and open it. Lock- - out and tag- - out this switch, if necessary. Two types of convenience outlets are offered on 48LC models: Non- - powered and unit- - powered. Both types provide...

  • Page 24: Hacr

    NOTICE Convenience Outlet Utilization Maximum Continuous use : 8 Amps 24/7 50HJ542739 C13415 Fig. 36 - - Convenience Outlet Utilization Notice Label HACR — The amp rating of the HACR factory installed option is based on the size, voltage, indoor motor and other electrical options of the unit as shipped from the factory.

  • Page 25: Units Without Thru- - Base Connections

    Pull the wires over to the terminal strip on the upper- - left corner of the Controls Connection Board. See Fig. 39. For details on operating 48LC*007 units equipped with the NOTE: If thru- - the- - bottom connections accessory is...

  • Page 26: 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 control passed thru the ISC board to the Smoke Alarm terminal.

  • Page 27: Cooling

    Table 4 – 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 28: Heating

    Heating — Select Switch is in the down position, the outdoor fans will run in the Minimum Fan Speed Mode (MIN) set to 160 rpm In the Heating Mode (W1 and G on the thermostat), the regardless of the cooling demand. ISC board sends power to W on the IGC board.

  • Page 29: Economi$Er X (Factory Installed Option)

    LCD display that permits direct EconoMi$er X is an ultra low leak economizer system input of setpoint values and configurations and display of which is available for 48LC 07 units. status and alarms. The factory- - installed option consists of: The W7220 controller is located in the RTU base unit’s...

  • Page 30: Menu Structure

    Using the Keypad with Settings and Parameters — 11. Press the (Enter) button to return to the current menu parameter. To use the keypad when working with Setpoints, System 12. Press the (Menu Up/Exit) button to return to the and Advanced Settings, Checkout tests and Alarms: previous menu.
  • Page 31 Table 6 - - 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 TEMPERATRUE (cont) ( ---18 to 60_C) (Accessory sensor required) Displays measured value of return air temperature from RAT sensor.
  • Page 32 Table 6 - - 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 33 Table 6 - - 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 34 Table 6 - - 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 35: Connections And Applications

    Connections and Applications W7220 Economizer Module Wiring — Use Fig. 44 and Tables 7 and 8 to locate the wiring terminals for the Economizer module. W7220 Controller Left Terminal Right Terminal Block Label Block Label C12014 Fig. 44 - - W7220 Economizer Module Terminal Connection Labels Table 7 –...

  • Page 36: Economizer Control Configurations

    20-K OHM PNO HH79NZ007 TSTAT W1 SD- O/B 20-K OHM OCCUPANCY --- TSTAT G PNO HH79NZ007 W7220 E- GND GROUND GRN/YEL S - BUS CONTROLlER EXH 1 POWER EXHAUST RELAY S - BUS IAQ - 2 - 10 SENSOR IAQ COM Y2 - 1 TSTAT Y3 IAQ 24V+...
  • Page 37 The W7220 calculates the enthalpy and dew point using Fig. 47 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 38: Demand Control Ventilation

    Demand Control Ventilation — should be set to an economizer position that brings in enough fresh air to remove contaminants and CO Demand Control 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 39: 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 40: Hardware

    Hardware Table 11 – SAT/OAT Sensor Characteristics Deg C Ohms Deg F Ohms Actuators — --- 30 415156 --- 20 386130 The Economizer X damper actuators are direct- - coupled --- 25 301540 193070 types with spring- - return. Power is 24- - v from the W7220 --- 20 221210 101820...

  • Page 41: Operating Sequences

    Table 14 – Supply Fan Speed Logic without Economizer 51/64 (21) TSTAT OUTPUT 24---V G/OCC 0--- V 0--- V 0--- V 4-1/4 (108) 24---V 0--- 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 42 W7220 input OCC remains energized; the outside air outdoor enthalpy, differential dry bulb or differential damper remains in MIN POS L. If ISC terminal G is also enthalpy), a space thermostat call for Stage 1 Cooling de- - energized with Y1, indicating AUTO Fan operation, energizes ISC terminals G and Y1;...

  • Page 43: Heating With Economi$Er

    Table 16 – W7220 Input’/Output with Demand Control Ventilation (DCV) INPUTS OUTPUTS Ref: Occupancy DEMAND OUTSIDE AIR Mechanical Cooling Stage OCC Yes OCC No CONTROL 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 44: Demand Control Ventilation

    Demand Control 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 Economize X control, a Demand Control Ventilation are SYSTEM SETUP, ADV SETUP and SETPOINTS.

  • Page 45: Status

    Troubleshooting To perform a Checkout test: 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 46 Table 17 – 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 47 C13683 Fig. 52 - - Typical EconoMi$er X Wiring Diagram...

  • Page 48: 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 Default Parameter Notes Value Range and Increment Value INSTALL 01/01/10 Display order = MM/DD/YY Setting order = DD, MM, then YY...
  • Page 49 Menu 2: Advanced Setup Parameter Project Parameter Parameter Default Notes Value Range and Increment Value MA LO SET 45_F (7_C) 35 to 55_F; SUPPLY AIR TEMPERATRUE 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 50: Staged Air Volume (Savt) With Variable Frequency Drive

    Menu 3: Setpoints Parameter Project Parameter Parameter Default 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 34).

  • Page 51: Multi- - Speed Vfd Display Kit

    The Remote VFD Keypad is part of the Multi- - Speed VFD display kit (PN: CRDISKIT002A00) which is a field- - installed option. It is not included with the 48LC 07 base unit. The VFD keypad as shown in Fig. 55 consists of the following sections:...

  • Page 52: Connecting The Keypad To The Vfd

    Navigation Keys and Status LEDs: The Navigation keys Connecting the Keypad Directly to the VFD — and Status LEDs are detailed in the following table. 1. Place the bottom of the VFD keypad into the variable frequency drive as shown in Fig. 56. Com.

  • Page 53: Program The Vfd For 3 Discrete Indoor Fan Speeds

    Program the VFD for 3 Discrete Indoor Fan Speeds select the desired language and press OK again. e. Press B(Down Arrow key) once; the display IMPORTANT: 48LC 07 units are programmed at the changes to - - Factory for 3 discrete indoor fan speeds. The...
  • Page 54 3. Clearing Alarm 060: External Interlock: 5. Entering Motor Data: a. Press the Menu key twice to position the B(tri- a. Press the Menu key to move the B(triangle angle icon) over Main Menu; the display icon) so it is positioned over Main Menu. The changes to - - display show the following - - 0--- ** Operation / Display...
  • Page 55 m. Press B(Down Arrow) once to display the l. Press B(Down Arrow) once, the following following - - display appears - - 1-25 Motor Nominal Speed 1-82 Min Speed for Functio… 1740rpm 1.0 Hz n. Press OK to highlight the rpm value and then m.
  • Page 56 f. Press the Back key until the following display f. Press OK again to highlight the bottom row and appears - - use the Y and B (Up and Down Arrow) keys to select 10.00s. Press OK again to set the selected 3--- 0* Reference Limits Ramp Down Time.
  • Page 57 c. Press OK, the following display appears - - 10. Setting Digital Inputs: a. Press the Back key until the following display 14--- 0* Inverter Switching appears - - 14--- 1* Mains On/Off 3--- ** Reference / Ramps d. Press B(Down Arrow) twice. The following 4--- ** Limits / Warnings display appears - - b.
  • Page 60 Legend and Notes for Tables 19 and 20 LEGEND: Example: Supply voltage is 230-3-60 BRKR --- Circuit breaker AB = 224 v --- Convenient outlet DISC --- Disconnect BC = 231 v --- Full load amps AC = 226 v --- Indoor fan motor --- Locked rotor amps (224 + 231 + 226)

  • Page 61: Smoke Detectors

    (as shipped) Smoke detectors are available as factory- - installed options on 48LC 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. All components necessary for operation are factory- - provided and mounted.

  • Page 62: Step 13 - Adjust Factory- -Installed Options

    HVAC Partners (www.hvacpartners.com). Power Exhaust Catalog No: 48LC ---7---02SI Copyright 2013 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 10/13 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 63: Start Up Checklist

    START-UP CHECKLIST (Remove and Store in Job File) I. PRELIMINARY INFORMATION MODEL NO.: SERIAL NO.: DATE: TECHNICIAN: II. PRE-START-UP (insert checkmark in box as each item is completed) j VERIFY THAT JOBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE j VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT j REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS j VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS...
  • Page 64 SET ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO MATCH JOB REQUIREMENTS (IF EQUIPPED) Catalog No: 48LC ---7---02SI Copyright 2013 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 10/13 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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