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Installation, Operation,
and Maintenance
Packaged Rooftop Air Conditioners
Precedent™ — Heat Pump
3 to 10Tons – 60 Hz
Model Numbers
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing
of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and
training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or
serious injury. When working on the equipment, observe all precautions in the literature and on the tags,
stickers, and labels that are attached to the equipment.
July 2014
WSC036E - WSC120E
SAFETY WARNING
RT-SVX23G-EN
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Table of Contents
Troubleshooting
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Summary of Contents for Ingersoll-Rand WSC036E
- Page 1 Precedent™ — Heat Pump 3 to 10Tons – 60 Hz Model Numbers WSC036E - WSC120E SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
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Page 2: Introduction
Introduction Read this manual thoroughly before operating or servicing this unit. WARNING Warnings, Cautions, and Notices Proper Field Wiring and Grounding Required! Safety advisories appear throughout this manual as Failure to follow code could result in death or serious required.Your personal safety and the proper operation of injury. - Page 3 Introduction Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission.Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.
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Page 4: Table Of Contents
Unit Dimensions ......12 WSC036E*, WSC048E1, and WSC060E1 - Installation Standard on Remaining Units) ..37 . - Page 5 Table of Contents Filters ......44 Return Air Smoke Detector Maintenance 44 Condensate Overflow Switch .
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Page 6: Model Number Description
Model Number Description Digit 1 - Unit Type Low Leak Economizer with Digit 23 - Refrigeration Controls Comparative Enthalpy with W Packaged Heat Pump No Refrigeration Control Barometric Relief Frostat™ Digit 2 - Efficiency Crankcase Heater Digit 15 - Supply Fan/Drive Type/ Standard Efficiency 11,13 Frostat™... -
Page 7: Model Number Notes
10. Requires hinged access panels. 11. Crankcase heaters are only available as option on WSC036E, WSC048E1, & WSC060E1. CCH are standard on all other units. 12. Motorized outside air damper is... -
Page 8: General Information
General Information Unit Inspection Compressor Nameplate As soon as the unit arrives at the job site The nameplate for the compressors are located on the side of the compressor. • Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data). -
Page 9: System Input Devices & Functions
General Information RLCI - ReliaTel™ LonTalk® Communication panel if the pressure differential across the filters is at least 0.5" w.c.The contacts will automatically open when the Interface (Optional) pressure differential across the filters decreases to This module is used when the application calls for an approximately 0.4"... -
Page 10: High Pressure Control
General Information diagnostic communicated to ICS™, if applicable, and a The zone sensor allows selection of 2, 3 or 4 system modes manual reset required to restart the compressor. On dual (Heat, Cool, Auto, and Off), two fan modes (On and Auto). compressor units only the affected compressor circuit is It has dual temperature selection with programmable start locked out. -
Page 11: Evaporator Frost Control
General Information Auto fan settings. It is a manual or auto changeover control detector, complete adherence to the maintenance with dual setpoint capability. Other features include a procedures, including recommended intervals timed override function, lockable system settings, and between filter changes, and coil cleaning is required. Fahrenheit or Celsius temperature display. -
Page 12: Unit Dimensions
Unit Dimensions Figure 1. Typical installation clearances for single & multiple unit applications WSC060-120E Units WSC036-048E Units RT-SVX23G-EN... - Page 13 Unit Dimensions Figure 2. Heat pump - 3-4 ton standard efficiency Note: All dimensions are in inches/millimeters. Figure 3. Heat pump - 3-4 ton standard efficiency - unit clearance and roof opening Note: All dimensions are in inches/millimeters. CLEARANCE 36”...
- Page 14 Unit Dimensions Figure 4. Heat pump - 3-4 ton standard efficiency - roof curb Note: All dimensions are in inches/millimeters. 44 MM 44 MM 1038 1038 MM 1053 1053 MM Figure 5. Heat pumps - 5-6 ton standard efficiency Note: All dimensions are in inches/millimeters. RT-SVX23G-EN...
- Page 15 Unit Dimensions Figure 6. Heat pump - 7½ ton standard efficiency Note: All dimensions are in inches/millimeters. Figure 7. Heat pump - 5-7½ ton - unit clearance and roof opening Note: All dimensions are in inches/millimeters. RT-SVX23G-EN...
- Page 16 Unit Dimensions Figure 8. Heat pump - 5-7½ ton - roof curb Note: All dimensions are in inches/millimeters. (356 MM) (2130 MM) Figure 9. Heat pump - 10 ton standard efficiency Notes: 1. All dimensions are in inches/millimeters. 2. 2" Electrical Connection: Single Point Power When Heat Installed (WSC Models only.) INDOOR TOP PANEL OUTDOOR TOP PANEL UNIT CONTROL WIRE...
- Page 17 Unit Dimensions Figure 10. Heat pump - 10 ton standard efficiency - unit clearance and roof opening Notes: 1. All dimensions are in inches/millimeters. 99 11/16” (2532 MM) 63 3/16” (1605 MM) Figure 11. Heat pump - 10 ton standard efficiency - roof curb Notes: 1.
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Page 18: Installation
Installation Pre-Installation WARNING Improper Unit Lift! WARNING Test lift unit approximately 24 inches to verify proper Fiberglass Wool! center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level. Failure to Product contains fiberglass wool. Disturbing the properly lift unit could result in unit dropping and insulation in this product during installation, possibly crushing operator/technician which could... - Page 19 Maximum unit & corner weights (lbs) and center of gravity dimensions (in.) Maximum Model Unit Weights Corner Weights Center of Gravity (in.) Tons Model No. Shipping Length Width WSC036E WSC048E WSC060E WSC072E 7½ WSC090E WSC120E 1431 1219 (a) Weights are approximate. (b) Corner weights are given for information only.
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Page 20: Foundation
Installation (a),(b) Table 2. Factory installed options (fiops)/accessory net weights (lbs) WSC036E-048E WSC060E WSC072E-090E WSC120E Net Weight Net Weight Net Weight Net Weight Accessory 3-4 Ton 5 Ton 6-7½ Ton 10 Ton Smoke Detector, Return Through-the-Base Electrical Unit Mounted Circuit Breaker Unit Mounted Disconnect (a) Weights for options not listed are <5 lbs. -
Page 21: Roof Curb
Installation Figure 16. Heat pump - 10 ton standard efficiency - Figure 18. Heat pumps - 5-7½ ton - downflow airflow horizontal airflow supply/return supply/return - through-the-base utilities Note: All dimensions are in inches/millimeters. Note: All dimensions are in inches/millimeters. 3 7/8”... -
Page 22: Rigging
Clearance required from duct to Model Number combustible surfaces (inches) Note: To assure proper condensate flow during operation, as well as proper operation of the WSC036E condensate overflow switch (if equipped), the unit WSC048E and curb must be level. WSC060E... -
Page 23: General Unit Requirements
Installation A Rigging illustration and Center-of-Gravity dimensional Figure 23. Fork lift pockets (WSC120) data table is shown in Figure 13, p. 19. Refer to the typical unit operating weights table before proceeding. 1. Remove all drill screws fastening wood protection to metal baserail. -
Page 24: Factory Installed Economizer
Secure out-ward edge of the duct cover with two Horizontal Discharge Conversion screws. Note: Certain unit/electric heater combinations require a WSC036E, WSC048E (3 to 4 Ton limit switch change out for horizontal airflow Units) applications. Refer to the following instructions to determine if this process is required for the unit undergoing installation. -
Page 25: Tco-A Instructions
Installation TCO-A Instructions Figure 26. Supply duct cover If the unit being installed is listed in the following table and Supply Duct Cover is equipped with the corresponding model number of factory installed electric heater package in the table, the limit controlTCO-A must be replaced with the extra limit control shipped in the heater compartment. -
Page 26: Return Air Smoke Detector
Installation 3. Obtain the replacementTCO-A which is secured by a 5. Using the remaining 2 screws removed in step 2, wire tie near the electric heater terminal block in the secure the bottom bracket. heater compartment. Attach it to the heater element Note: Refer to horizontal view below. -
Page 27: Electric Heat Requirements
Installation Note: All field-installed wiring must comply with NEC 6. Replace evaporator access panel and supply air access and applicable local codes. panels. To convert drain condensate through-the-base Electric Heat Requirements of unit: • Verify that the power supply complies with the electric 1. -
Page 28: Filter Installation
Installation Drain Pan Removal (Units with Condensate installed at or near the unit in accordance with the National Electrical Code (NEC latest edition). Overflow Switch Option) Standard Wiring Before drain pan removal, the switch wire must be disconnected from wire tie on panel and/or any tape 1. -
Page 29: Field Installed Control Wiring
Installation Figure 34. WSC120E WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. The transformer is located in the control panel.The circuit breaker is located on the left side of the transformer and SEAL BETWEEN... - Page 30 Installation output devices and the system components utilizing a Figure 36. ReliaTel™ refrigeration module DC analog input\output signal to the unit. Note: Resistance in excess of 2.5 ohms per conductor can cause deviations in the accuracy of the controls. 2. Ensure that the wiring between controls and the unit’s termination point does not exceed two and a half (2.5) ohms/conductor for the length of the run.
- Page 31 Installation Figure 37. Customer control low voltage routing (all units except 10 ton) Figure 38. ReliaTel™ (without TBUE) control customer wire routing (10 ton) RT-SVX23G-EN...
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Page 32: Space Temperature Averaging (Reliatel™ Only)
Installation Figure 39. ReliaTel™ (with TBUE) control customer wire routing (10 ton) Space Temperature Averaging (ReliaTel™ only) Space temperature averaging is accomplished by wiring a number of remote sensors in a series/parallel circuit. Using the BAYSENS016* or BAYSENS077*, at least four sensors are required to accomplish space temperature averaging. - Page 33 Installation Figure 40. Examples Note: Wiring pin numbers are for reference only.There are multiple smoke detector systems that could have differently numbered pins. For correct wiring details, please refer to the specific smoke detector literature that accompanied this unit. RT-SVX23G-EN...
- Page 34 Installation Figure 41. Typical field wiring diagrams for optional controls BA YSENS075* BA YSENS075* BA YSENS108* BA YSENS106* BA YSENS110* BA YSENS119* BAYSENS073* BAYSENS074* BAYSENS075* ASYSTAT669A OPTIONAL REMOTE SENSOR RT-SVX23G-EN...
- Page 35 Installation Table 7. Temperature versus resistance (temperature vs. resistance is negative) Temperature Degrees F° Degrees C° Nominal Resistance -20° -28.9° 170.1 K - Ohms -15° -26.1° 143.5 K - Ohms -10° -23.3° 121.4 K - Ohms -5° -20.6° 103.0 K - Ohms 0°...
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Page 36: Pre-Start
Pre-Start Use the checklist provided below in conjunction with the 100 X AV - VD “General Unit Requirements” checklist to ensure that the % Voltage Imbalance = where; unit is properly installed and ready for operation. WARNING Volt 1 + Volt 2 + Volt 3 AV (Average Voltage) = Hazardous Voltage w/Capacitors! Disconnect all electric power, including remote... -
Page 37: Compressor Crankcase Heaters (Optional On Wsc036E*, Wsc048E1, And Wsc060E1 - Standard On Remaining Units)
Compressor Crankcase Heaters (Optional on WSC036E*, WSC048E1, and WSC060E1 - Standard on Remaining Units) Each compressor can be equipped with a crankcase heater.The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the “Off”... -
Page 38: Test Modes
Pre-Start Table 8. Service test guide for component operation Multi-Speed Fan Test Step Mode Econ Comp1 Comp 2 Heat 1 Heat 2 Ohms Output Minimum Position Setpoint 0% 2.2K Minimum Selectable Ventilation Economizer Test Open 3.3K Open Minimum Cool Stage 1 4.7K Position Minimum... -
Page 39: Unit Start-Up
Unit Start-Up Verifying Proper Air Flow If the required CFM is too low, (external static pressure is high) do one or both of the following and repeat procedure: WARNING • Relieve supply and/or return duct static. • Change indoor fan speed tap to a higher value Live Electrical Components! If the required CFM is too high, (external static During installation, testing, servicing and... -
Page 40: Reliatel™ Units With Direct Drive Indoor Fan (7.5 To 10 Ton Units)
Unit Start-Up b. Change indoor fan speed and repeat Step 1 Once the supply fan has started, determine the total Step system airflow (CFM) • To Increase Fan RPM; Loosen the pulley adjustment set 1. Measure the DC voltage across harness test terminals. screw and turn sheave clockwise. -
Page 41: Return Air Smoke Detector
Unit Start-Up Return Air Smoke Detector 5. Turn the MIN POS - DCV potentiometer on the RTEM clockwise to open or counter-clockwise to close.This The return air smoke detector is designed to shut off the will set the minimum damper position for high speed unit if smoke is sensed in the return air stream. -
Page 42: Compressor Start-Up
Unit Start-Up 4. Verify that the dampers stroked to the full open 6. To stop the SERVICETEST, turn the main power position. disconnect switch to the “Off” position or proceed to the next component start-up procedure. 5. To stop the SERVICETEST, turn the main power disconnect switch to the “Off”... -
Page 43: Maintenance
Maintenance Once the new belts are installed, using a Browning or Gates tension gauge (or equivalent) illustrated in WARNING Figure 43, p. 43; adjust the belt tension as follows; Hazardous Service Procedures! 1. To determine the appropriate belt deflection; The maintenance procedures recommended in this a. -
Page 44: Monthly Maintenance
Maintenance • Inspect the evaporator and condenser coils for dirt, Table 10. Belt tension measurement and deflection bent fins, etc. If the coils appear dirty, clean them ranges according to the instructions described in “Coil Deflection Force (Lbs.) Cleaning” later in this section. Super Steel Cable •... -
Page 45: Coil Cleaning
Maintenance Coil Cleaning 2. Protect all electrical devices such as motors and controllers from any over spray. Regular coil maintenance, including annual cleaning, 3. Straighten any bent coil fins with a fin comb. enhances the unit’s operating efficiency by minimizing: compressor head pressure and amperage draw;... -
Page 46: Final Process
Maintenance Final Process Wiring Diagram Numbers (from unit control panel) _____________________________________________________ For future reference, you may find it helpful to record the Schematics unit data requested below in the blanks provided. _____________________________________________________ Complete Model Number Connections _____________________________________________________ _____________________________________________________ Unit Serial Number _____________________________________________________ Table 11. -
Page 47: Troubleshooting
Troubleshooting 4. If a System failure is indicated, recheck Step 1 Step 2. If the LED is not lit in Step 1, and 24 VAC is present WARNING Step 2, the RTRM has failed. Replace the RTRM. Hazardous Service Procedures! 5. -
Page 48: Resetting Cooling And Heating Lockouts
Troubleshooting Test Mode = voltage alternates between 32 VDC & 0.75 Zone Sensor LED 4 (Service) “On” indicates a clogged filter. Heat Failure “Off” during normal operation. Measure the voltage between terminals J6-7 & J6-6. “Flashing” indicates an evaporator or condensate overflow switch failure. -
Page 49: Zone Temperature Sensor (Zts) Service Indi
Troubleshooting Test 2 Cooling Set Point (CSP) and Heating Lockouts can be cleared through the building management system. Refer to the building management Set Point (HSP) system instructions for more information. Table 12. Cooling (CSP) and heating setpoint (HSP) Zone Temperature Sensor (ZTS) Zone Nominal ZTEMP Nominal CSP or... -
Page 50: Programmable & Digital Zone
Troubleshooting Unit Operation without a Zone Sensor Note: Measurements should be made from LED common (ZSM terminal 6 to respective LED terminal). Refer This procedure is for temporary operation only.The to the Zone Sensor Module (ZSM)Terminal economizer and condenser fan cycling functions are Identification table at the beginning of this section. - Page 51 Troubleshooting Table 13. Fault detection and diagnostic codes Primary Fault Codes Information Code Temp Mixed Air Outdoor Pressure Space Unit Economizer RTEM Sensor Airflow Unit Fails Damper Temp Temp Dead band Press Dead Economizing Failures Actuator Comm Fail Sensor Fail Position % Sensor Sensor...
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Page 52: Troubleshooting Procedures For Direct Drive
Troubleshooting Unit Economizer Control (ECA) Troubleshooting ReliaTel Control Verify Economizer Status by Economizer Actuator (ECA) LED indicator: OFF: No Power or Failure ON: Normal, OK to Economize Slow Flash: Normal, not OK to Economize Fast Flash - 1/2 Second On / 2 Seconds Off: Error Code: Communications Failure Pulse Flash: 2 Seconds On / 1/2 Second Off:... -
Page 53: Wiring Diagrams
Wiring Diagrams Note: Wiring diagrams can be accessed using e-Library by entering the diagram number in the literature order number search field or by contacting technical support. Table 15. Unit wiring diagram numbers Schematic Type Voltage Drawing Number Description 4366-1007 2 - 7.5 Ton Heat Pump 208-230, 460, 575... -
Page 54: Limited Warranty
Limited Warranty Heat Pump WCC, WCD, WCH, WCM and Attention: Manager, Product Service WSC (Parts Only) GW-611-4001 *This limited warranty is for residential usage of this Models Less Than 20 Tons for Residential Use* equipment and not applicable when this equipment is This limited warranty is extended byTrane Inc., to the used for a commercial application. -
Page 55: Heat Pump Wcz, Wcy, Wcx, Wcc, Wcd, Wch, Wcm, Wcp And Wsc (Parts Only)
Limited Warranty Heat Pump WCZ, WCY, WCX, WCC, WCD, WCH, WCM, WCP and WSC (Parts Only) Models Less Than 20 Tons for Commercial Use* This warranty is extended byTrane Inc., to the original purchaser and to any succeeding owner of the real property to which the Heat Pump is originally affixed, and applies to products purchased and retained for use within the U.S.A. - Page 56 The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments,the manufacturer offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For more information, visit www.IRCO.com.
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