Trane Technologies Axiom EXW, Installation, Operation And Maintenance Manual

Page: 27 / 32

WSHP-SVX02C-EN 27
Troubleshooting
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this 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.
Unless specified otherwise, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
Preliminary Trouble Inspection
If operational difficulties are encountered, be sure to
perform the preliminary checks before referring to the
troubleshooting chart on
p. 27 .
• Verify that the unit is receiving electric supply power.
• Ensure that the fuses in the fused disconnect (field
installed) are intact.
After completing the preliminary checks, inspect the unit
for other obvious problems such as leaking connection,
broken or disconnected wires, etc. If everything appears to
be in order, but the unit still fails to operate properly, refer
to the troubleshooting chart on
p. 27 .
General Operation
The standard model is designed for indoor installation.
When the unit is installed in an unconditioned space, the
unit may not start in cool weather (approximately 45°F). It
may then be necessary to start the unit in the cooling mode
for three to five minutes. The unit may then be shut-off
(there will be a two minute time-out of the unit), and
restarted in the heating mode. The freeze protection
thermostat should also be checked as it may be adversely
affected by ambient temperature.
Like any other type of mechanical equipment, the unit
performs best when it is well maintained.
Table 15. Troubleshooting checklist
Problem Heating Cooling Cause Correction
No response to any thermostat
setting
X X Main power off Check fuses
X X Defective control transformer Replace
X X Broken or loose connection Repair
X X Defective thermostat Replace
X X Transformer Reset Transformer
Unit short cycles X X Thermostat or sensor improperly located Relocate
Insufficient capacity
X X Low on refrigerant charge
Locate leak, repair and recharge by weight (not
by superheat)
X X Restricted thermal expansion valve Replace
X X Defective reversing valve See WSHP-SVXXX-EN for touch test chart
X X Thermostat improperly located Relocate
X X Unit undersized Recalculate heat gains/losses
X X Inadequate water flow Increase GPM
X X Scaling in heat exchanger Clean or replace
X Water too hot Decrease temperature
X Water too cold Increase temperature
High pressure switch open
X Inadequate GPM Increase water flow to unit
X Water too hot Decrease temperature
X X Overcharged with refrigerant Decrease charge
X X Defective pressure switch Check or replace
High head pressure
X Trash in heat exchanger Backflush
X Low water flow Increase GPM
X X Overcharge of refrigerant Decrease charge
X X Non-condensable in system Evacuate and recharge by weight
X X Water too hot Decrease temperature