Trane WC-IOM-7 - Manual

6 WC-IOM-7 Digits 1, 2 - Product Type Digit 8 - Electrical characteristics WC = Packaged cooling, electric heat 3 = 208-230/60/3 WF = With factory installed options 4 = 460/60/3D = 400/50/3 Digit 3 - Airflow Configuration T = 380/60/3 D = Downflow W = 575/60/3 H = Horizontal Digit 9, 10 - Factory in...

WC-IOM-7 • Packaged Heat Pump 7 Unit Nameplate A Mylar unit nameplate is located on the unit’s corner support next to the control box. It includes the unit model number, serial number, electrical characteristics, refrigerant charge, as well as other pertinent unit data. Compressor Nameplate The name...

8 Packaged Heat Pump • WC-IOM-7 General Information ordered as a kit to be field installed. Follow the installation instruction that ships with each kit when field installation is necessary. RLCI - ReliaTel™ LonTalk Communication Interface (Optional) This module is used when the application calls fo...

WC-IOM-7 • Packaged Heat Pump 9 General Information Compressor Disable (CPR1/2) This input incorporates the low pressure control (LPC) of each refrigeration circuit and can be activated by opening a field supplied contact installed on the LTB. If this circuit is open before the compressor is started...

10 Packaged Heat Pump • WC-IOM-7 General Information Lead/Lag Control (Dual Circuit Only) Lead/Lag is a selectable input located on the RTRM. The RTRM is configured from the factory with the Lead/Lag control disabled. To activate the Lead/Lag function, simply cut the wire connected to J3-8 at the RT...

WC-IOM-7 • Packaged Heat Pump 11 General Information Remote Zone Sensor (BAYSENS013C) This electronic sensor features remote zone sensing and timed override with override cancellation. It is used with a Trane Integrated ComfortTM building management system. Remote Zone Sensor (BAYSENS014C) This elec...

12 Packaged Heat Pump • WC-IOM-7 General Information Smoke Detector Sensor (Optional) This sensor is only applicable on units equipped with a RTOM. It provides high limit “shutdown” of the unit and requires a manual reset. The sensor is used to detect smoke due to fire in the air conditioning or ven...

WC-IOM-7 • Packaged Heat Pump 13 General Information Take photos of the damage, if possible. The owner must provide reasonable evidence that the damage did not occur after delivery. • Notify the appropriate sales representative before installing or repairing a damaged unit.  WARNING Fiberglass Wool...

14 Packaged Heat Pump • WC-IOM-7 General Information The manufacturer will not assume any responsibility for equipment damage resulting from condensate accumulation on the unit’s electrical and/or mechanical components. Unit Clearances Figure 1 illustrates the minimum operating and service clearance...

WC-IOM-7 • Packaged Heat Pump 15 Unit Dimensions Figure 1. Typical Installation Clearances for Single & Multiple Unit Applications

16 Packaged Heat Pump • WC-IOM-7 Unit Dimensions Figure 2. Unit Dimensional Data 12 1/2 Ton, 15 Ton Figure 3. Roof Curb Dimensional Data 12 1/2 Ton, 15 Ton

WC-IOM-7 • Packaged Heat Pump 17 Unit Dimensions Figure 4. Unit Dimensional Data 20 Ton Figure 5. Roofcurb Dimensional Data 20 Ton

18 Packaged Heat Pump • WC-IOM-7 Unit Dimensions Figure 6. Horizontal Duct Dimensional Data 12 1/2 Ton, 15 Ton Figure 7. Horizontal Duct Dimensional Data 20 Ton

WC-IOM-7 • Packaged Heat Pump 19 Unit Dimensions  WARNING Heavy Objects! Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the...

20 Packaged Heat Pump • WC-IOM-7 Unit Dimensions Rigging Refer to Figure 8 and Table 1 for typical unit operating weights riffing before proceeding. 1. Remove the shipping crate from around the unit. Do not remove the crating from the top of the unit. 2. Rig the unit as shown in Figure 8 . Attach ad...

WC-IOM-7 • Packaged Heat Pump 21 Foundation Horizontal Units If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at each support location with a “full perimeter” support structure or a slab foundation for support. Refer to Table 1 on page 19 for the un...

22 Packaged Heat Pump • WC-IOM-7 Installation personnel with what is required in the installation process. It does not replace the detailed instructions called out in the applicable sections of this manual. • Check the unit for shipping damage and material shortage; file a freight claim and notify a...

WC-IOM-7 • Packaged Heat Pump 23 Installation • Connect properly sized control wiring to the proper termination points between the zone thermostat and the unit control panel. Condensate Drain Configuration An evaporator condensate drain connection is provided on each unit. Refer to Unit Dimensions f...

24 Packaged Heat Pump • WC-IOM-7 Installation Note: All field installed wiring must conform to NEC guidelines as well as State and Local codes. Verify that the power supply available is compatible with the unit’s nameplate ratings. The available supply power must be within 10% of the rated voltage s...

WC-IOM-7 • Packaged Heat Pump 25 Installation 2. Provide proper grounding for the unit in accordance with local and national codes. Field Installed Control Wiring An overall layout of the various control options available with the required number of conductors for each control device is illustrated ...

26 Packaged Heat Pump • WC-IOM-7 Installation The transformer is located in the control panel. The circuit breaker is located on the left side of the transformer and can be reset by pressing in on the black reset button. Controls using 24 VAC Before installing any connecting wiring, refer to Unit Di...

WC-IOM-7 • Packaged Heat Pump 27 Installation 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 t...

28 Packaged Heat Pump • WC-IOM-7 Installation Smoke Detector Customer Low Voltage Wiring When interlocking System Sensor smoke detectors together, all of the detectors must be powered from the same power supply. If multiple smoke detectors are required, all detectors must be disconnected from the HV...

30 Packaged Heat Pump • WC-IOM-7 Installation Space Temperature Averaging Space temperature averaging is accomplished by wiring a number of remote sensors in a series/parallel circuit. Using the BAYSENS016* or BAYSENS017*, at least four sensors are required to accomplish space temperature averaging....

WC-IOM-7 • Packaged Heat Pump 31 Installation Use the checklist provided below in conjunction with the “General Unit Requirements” checklist to ensure that the unit is properly installed and ready for operation.  WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects...

32 Packaged Heat Pump • WC-IOM-7 Installation • Check the supply fan belts for proper tension and the fan bearings for sufficient lubrication. If the belts require adjustment, or if the bearings need lubricating, refer to the maintenance section of this manual for instructions. • Verify that a conde...

WC-IOM-7 • Packaged Heat Pump 33 Installation Electrical Phasing (Three Phase Motors) The compressor motor(s) and the supply fan motor are internally connected for the proper rotation when the incoming power supply is phased as A, B, C. Proper electrical supply phasing can be quickly determined and ...

WC-IOM-7 • Packaged Heat Pump 35 Test Modes There are three methods in which the “Test” mode can be cycled at LTB-Test 1 and LTB-Test 2. 1. Step Test Mode - This method initiates the different components of the unit, one at a time, by temporarily shorting across the two test terminals for two to thr...

WC-IOM-7 • Packaged Heat Pump 37 Pre-Start Return Air Smoke Detector The return air smoke detector is designed to shut off the unit if smoke is sensed in the return air stream. Sampling the airflow entering the unit at the return air opening performs this function. In order for the smoke detector to...

WC-IOM-7 • Packaged Heat Pump 38 Economizer Start-Up ReliaTel Control Using the Service Test Guide in Table 5, p. 35 , momentarily jump across the Test 1 & Test 2 terminals on LTB1 one time to start the Minimum Ventilation Test. 1. Set the minimum position setpoint for the economizer to the requ...

WC-IOM-7 • Packaged Heat Pump 39 Start Up Scroll Compressors a. Once each compressor has started, verify that the rotation is correct. If a scroll compressor is rotating backwards, it will not pump and a loud rattling sound can be observed. b. If the electrical phasing is correct, before condemning ...

40 Packaged Heat Pump • WC-IOM-7 Start Up 2. ReliaTel Control Using the Service Test Guide in Table 5, p. 35 , continue the SERVICE TEST start-up procedure for each compressor circuit. Momentarily jump across the Test 1 & Test 2 terminals on LTB one additional time if continuing from previous co...

WC-IOM-7 • Packaged Heat Pump 41  WARNING Rotating Components! During installation, testing, servicing and troubleshooting of this product it may be necessary to measure the speed of rotating components. Have a qualified or licensed service individual who has been properly trained in handling expos...

42 Packaged Heat Pump • WC-IOM-7 Maintenance Note: Actual belt deflection “force” must not exceed the maximum “force” value shown in Table 6 . 7. Recheck the belt tension at least twice during the first 2 to 3 days of operation. Belt tension may decrease until the new belts are “run in”. Monthly Mai...

WC-IOM-7 • Packaged Heat Pump 43 Maintenance Filters • Inspect the return air filters. Clean or replace them if necessary. Refer to the unit Service Facts for filter information. Return Air Smoke Detector Maintenance Airflow through the unit is affected by the amount of dirt and debris accumulated o...

44 Packaged Heat Pump • WC-IOM-7 Maintenance • With the unit running, check and record the: ambient temperature; compressor suction and discharge pressures (each circuit); superheat (each circuit); Record this data on an “operator ’s maintenance log” like the one shown in Table 7 on page 46 . If the...

WC-IOM-7 • Packaged Heat Pump 45 Maintenance  WARNING Hazardous Pressures! Coils contain refrigerant under pressure. When cleaning coils, maintain coil cleaning solution temperature under 150°F to avoid excessive pressure in the coil. Failure to follow these safety precautions could result in coil ...

46 Packaged Heat Pump • WC-IOM-7 Maintenance _______________________________________________________________________ _______________________________________________________________________ — connection(s) _______________________________________________________________________ _______________________...

48 Packaged Heat Pump • WC-IOM-7 Troubleshooting to check all of the RTRM outputs, and all of the external controls (relays, contactors, etc.) that the RTRM outputs energize, for each respective mode. Proceed to Step 6. 6. Step the system through all of the available modes, and verify operation of a...

WC-IOM-7 • Packaged Heat Pump 49 Troubleshooting LED 4 (Service) “On” indicates a clogged filter. “Off” during normal operation. “Flashing” indicates an evaporator fan failure Below is the complete listing of failure indication causes. System Failure Check the voltage between terminals 6 and 9 on J6...

50 Packaged Heat Pump • WC-IOM-7 Troubleshooting Test Mode = voltage alternates between 32 VDC & 0.75 VDC Heat Failure Measure the voltage between terminals J6-7 & J6-6. Heat Operating = approximately 32 VDC Heat Off = less than 1 VDC, approximately 0.75 VDC Heating Failure = voltage alterna...

52 Packaged Heat Pump • WC-IOM-7 Troubleshooting Zone Temperature Sensor (ZTS) Test Note: These procedures are not for programmable or digital models and are conducted with the Zone Sensor Module electrically removed from the system. Test 1 Zone Temperature Thermistor (ZTEMP) This component is teste...

WC-IOM-7 • Packaged Heat Pump 53 Troubleshooting Test 3 System Mode and Fan Selection The combined resistance of the Mode selection switch and the Fan selection switch can be measured between terminals 2 and 4 on the Zone Sensor. The possible switch combinations are listed on the following page with...

54 Packaged Heat Pump • WC-IOM-7 Troubleshooting 4. Verify all modes of operation, by running the unit through all of the steps in the “Test Modes” section discussed in “Unit Start-Up”. 5. After verifying proper unit operation, exit the test mode. Turn the fan on continuously at the ZSM, by pressing...

WC-IOM-7 • Packaged Heat Pump 55 Troubleshooting Unit Economizer Control (ECA) Troubleshooting ReliaTel Control Table 10. 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...

WC-IOM-7 • Packaged Heat Pump 56 For easier access, after 2007, published unit wiring diagrams (individual, separate diagrams for unitary product lines) will become available via e-Library instead of through wiring manuals. Diagrams prior to 2008 will be located in wiring diagram books RT-SVE03A-EN ...

WC-IOM-7 • Packaged Heat Pump 57 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 by Trane, to the original purchaser and to any succeeding owner of the real property to which the Heat Pump is originally affi...

58 Packaged Heat Pump • WC-IOM-7 Warranty Heat Pump Standard Equipment Warranty Terms and Conditions Commercial Equipment Warranty and Liability Models Larger that 20 Tons for Commercial Use* The Company warrants for a period of 12 months from initial start-up or 18 months from date of shipment, whi...