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Service Guide
Water Source Heat Pump
Axiom™ Variable Speed —VSH/VSV
24–60 MBtuh, 60 Hz
Model Numbers:
VSHE024-060
60 Hz
VSVE024-060
60 Hz
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.
May 2020
SAFETY WARNING
WSHP-SVG02C-EN
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Table of Contents
Troubleshooting
Related Manuals for Trane Axiom VSH Series
Summary of Contents for Trane Axiom VSH Series
- Page 1 Service Guide Water Source Heat Pump Axiom™ Variable Speed —VSH/VSV 24–60 MBtuh, 60 Hz Model Numbers: VSHE024-060 60 Hz VSVE024-060 60 Hz 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: Warnings, Cautions And Notices
SWITCHING, DISCONNECTING, OR VOLTAGE Responsible Refrigerant Practices! TESTING WITHOUT PROPER ELECTRICAL PPE AND Trane believes that responsible refrigerant practices are ARC FLASH CLOTHING. ENSURE ELECTRICAL important to the environment, our customers, and the air METERS AND EQUIPMENT ARE PROPERLY RATED conditioning industry. -
Page 3: Table Of Contents
Table of Contents Warnings, Cautions and Notices Failure Modes and Protection Conditions ..2 Analog Input Failures and Overrides ..19 Variable-Speed WSHP UC400 Controller . . . 4 Protection Functions . -
Page 4: Variable-Speed Wshp Uc400 Controller
Variable-Speed WSHP UC400 Controller I/O Definitions Hard-wired input/outputs for the variable-speed WSHP UC400 controller are defined in Table Table 1. UC400 hard wired input/output definitions UC400 Connection Connection type terminal Variable-speed WSHP configuration specifications Valid range Zone Temp Sensor/Timed Override and Timed 10 kΩ... -
Page 5: Uc400 Setpoints And Setup Parameters
Variable-Speed WSHP UC400 Controller UC400 Setpoints and Setup Table 3. UC400 setup parameters (continued) Input Name Range Default Parameters Supply Fan Speed High 75-110% 100% Limit The setpoints shown in Table 2 are available for modification through the Tracer TU Field Service Tool if Enable Filter Runtime Hours Enable... -
Page 6: Minimum Supply Fan Output
Variable-Speed WSHP UC400 Controller Minimum supply fan output Shutdown Once the compressor is no longer requested for heating or The user shall also have the ability to select the minimum cooling operation, the compressor speed shall ramp down supply airflow that will be provided from the unit in order to the unit tonnage specific minimum speed and will to meet requirements of the application. -
Page 7: Sequence Of Operation
Sequence of Operation During normal operation, the compressor and supply fan through Tracer TU. The Default Dehumidification setpoint outputs modulate to maintain the space temperature at will also only be adjustable through Tracer TU or through the user-selected space temperature setpoint(s). a BAS. -
Page 8: Occupied Mode
Occupied Bypass mode. If required, the user can enable/disable the zone sensor fan Some Trane zone sensors have ON and CANCEL buttons switch functionality through BAS or the Tracer TU service for timed override operation. Pressing the ON button on tool. -
Page 9: Unit Mode Arbitration
Sequence of Operation Unit Mode Arbitration Table 4. Unit operating mode based on communicated value Heat Cool Mode Effective Unit Request Mode Operation Description Auto Auto Mode determined by active setpoint/sensor values. Heat Heat Fan Operation and Heating Operation Allowed; no Cooling or Dehumidification. Morning worm up Heat Fan Operation and Heating Operation Allowed;... -
Page 10: Isolation Valve "Off" Control
Sequence of Operation isolation valve, once opened, the isolation valve will required ON/OFF time in order to meet the space remain open for a minimum of 10 minutes. demand. • When the required unit capacity is greater than the Entering Water Temperature (EWT) sampling minimum capacity for the unit, the unit will operate the The VS WSHP controller will sample the entering water compressor and fan between minimum and maximum... -
Page 11: Demand Limit Operation
Sequence of Operation capability of the unit. If a Space Humidity value is not Demand Limit Operation present at the controller, this version of Enhanced Dehumidification will be disabled. The following The VS WSHP controller supports a communicated transition rules are used for entering and leaving request for Demand Limiting operation of the Compressor enhanced dehumidification: and Supply Fan outputs. -
Page 12: Troubleshooting
Troubleshooting General Unit Troubleshooting WARNING Hazardous Service Procedures! The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. -
Page 13: Compressor Drive Troubleshooting
Troubleshooting Table 5. General unit troubleshooting (continued) Problem Heating Cooling Cause Correction Trash in heat exchanger Backflush Low water flow Increase GPM Overcharge of refrigerant Decrease charge Non-condensable in system Evacuate and recharge by weight High head pressure Water too hot Decrease temperature Dirty filter Clean/replace... - Page 14 Troubleshooting Table 6. 208–230 VAC Single-phase units (continued) Unit Interface Protection Reset (a),(b) size module function type Description Protection criteria Reset criteria Compressor Shutdown If the drive module loses 024/033 communication with the No communication between Drive Module and Interface Communication E - 02 Automatic...
- Page 15 Troubleshooting Table 6. 208–230 VAC Single-phase units (continued) Unit Interface Protection Reset (a),(b) size module function type Description Protection criteria Reset criteria If the drive module gets Power is cycled to the 024/033 Power Module Current > 45 A into an over current drive.
- Page 16 Troubleshooting Table 7. 460 VAC three-phase units Unit Interface Protection (a),(b) Size module function Reset type Description Protection criteria Reset criteria If the compressor 024/033 Compressor Current > 23 A current exceeds a Compressor predefined limit, the E - 05 Over current ...
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Page 17: Tracer Tu Initiated Service Test Mode
Troubleshooting Table 7. 460 VAC three-phase units Unit Interface Protection (a),(b) Size module function Reset type Description Protection criteria Reset criteria If the drive module gets into an over 024/033 current condition, the drive will shut down. The drive will attempt to restart the compressor after 120 E-03... -
Page 18: Test Mode Overrides
Troubleshooting Table 9. Service Test Mode steps Isolation Supply Supply Fan % Compressor Compressor % Reversing Valve (b),(c) (c),(d) Step Mode (AO1) (BO3) (AO2) Valve (BO7) (BO2) Isolation valve open 100% Cool 100% Capacity 100% Capacity Changeover (Low Heat) See footnote See footnote 100% Heat 100% Capacity... -
Page 19: Analog Input Failures And Overrides
Troubleshooting • Mode Input Failure If neither a hard-wired nor communicated setpoint is present, the controller uses the stored default configured • Humidity Sensor Failure setpoints: Note: If a failure occurs during test mode (Local or Tracer • Space Temperature Setpoint Default TU initiated) that overrides the compressor to OFF, •... -
Page 20: Protection Functions
Troubleshooting value is out of range, or if the Space Humidity BAS point • Total number of Frost Protection trips = 5 within the 4 is In-Service, but there is no valid communicated Space hour timer and a manual diagnostic reset condition Humidity value, Dehumidification operation is disabled has been activated. -
Page 21: Diagnostic Resetting
Troubleshooting • Diagnostic: Heat Sink Temperature Invalid/Out of Compressor Protection Status—TDL, HPC, LPC, Range (TDL is Discharge Line Temp 2B1S3, HPC is High • Diagnostic: Humidity Input Failure Pressure Switch 2B1S1, LPC is Low Pressure The Normally Closed Switch 2B1S2) Drive Overload. •... -
Page 22: Control Wiring
Control Wiring Figure 1. 208V single-phase wiring WSHP-SVG02C-EN... - Page 23 2. Dashed lines indicate recommended field wiring by others. Field writing to be rated for 600 V. Dashed line enclosure and/or dashed device outlines indicate components provided by the field. Solid lines indicate wiring by the Trane company. 3. Numbers along the right side of the schematic designate the location of the contacts by line number.
- Page 24 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.
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