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TROUBLESHOOTING
9. TROUBLESHOOTING
9.1 Room temperature varies signicantly from its
setting
• Unit may have been incorrectly sized for the building.
• Drafts from wrongly placed supply air diffusers or
from the back of the wall plaque could be affecting the
temperature sensor built into the wall plaque.
• Poor air circulation in the room can cause incorrect
temperature readings.
9.2 Air conditioner does not seem to deliver the heating
when most needed
• Heating capacity at design conditions may be
incorrect. As the outside temperature falls, heat losses
through the walls, oor and ceiling increase.
• Check the unit’s brochure for information on the
minimum/ maximum operating temperatures.
9.3 When heating, units have de-icing cycles built in to
remove ice on the outdoor coil.
• This usually means reversing the cycle for a few
minutes during which time there is no heating and in
fact a little cooling can occur.
9.4 In a new building, why does it take some days
before the air conditioning heat pump unit seems to
work properly
• Many new buildings, especially a commercial buildings,
have a large amount of concrete and other structural
materials that are generally cold and full of moisture.
This is most evident in the winter when trying to heat
the building from scratch.
9.5 Unit is leaking water
• Check the drain trap/vent/slope.
• Water carry-over: Reduce the maximum fan speed.
9.6 Air conditioner runs excessively – the temperature
remains too hot in summer or too cold in winter.
• Windows or doors may be opened to non conditioned
areas.
• Keep doors to unconditioned areas closed.
• Leaves, papers or other items blocking air ow over the
outdoor unit coil.
• Location of wall controller or remote temperature
sensor is incorrect.
• Check for leaks in supply or return air ductwork.
9.7 Unit displays an error code:
• Refer to UC8 Controller label on the unit for
operation & fault diagnostics information or visit
www.temperzone.biz; model search ‘UC8 Controller’.
• Press the Alarm button on the pGD to list the most
recent faults. Refer OPA 1470/1710/2100 Controller
Manual for an explanation.
MAINTENANCE
8. MAINTENANCE
WARNING! HAZARDOUS VOLTAGE. ENSURE ALL POWER SUPPLIES ARE
ISOLATED BEFORE PERFORMING MAINTENANCE. FAILURE TO ISOLATE
POWER CAN LEAD TO SERIOUS INJURY.
8.1 Monthly
1. Check air lters and vacuum, wash clean or replace
as necessary.
2. Check condensate drain for free drainage.
3. Check compressor compartment for oil stains
indicating refrigerant leaks.
!WARNING
Under no circumstances shall potential sources of
ignition be used in the searching for or detection of
refrigerant leaks. If a leak is suspected, all naked
ames shall be removed/extinguished.
If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered from
the system.
4. Check system operating pressures via the Carel
c.PCO controller (refer Appendix I).
8.2 Every Three Months
1. Check operation of Economiser dampers.
2 Check for obstruction of Economiser dampers.
8.3 Six Monthly
1. Check the tightness of electrical connections.
2. Check for signs of corrosion on electrical connections
in high salt atmospheres; replace where necessary.
3. Check the tightness of all fan motor mountings
4. Check system operating pressures via the Carel
c.PCO controller (refer Appendix I).
5. Check condensate drain for free drainage.
8.4Yearly
1. Check all refrigerant piping for chang and vibration.
2. Check air supply at all diffusers
3. Check for excessive noise and vibration and correct
as necessary.
4. Check for insulation and duct damage and repair
as necessary.
5. Check sensor values with calibration tool.
Adjust +/- offset via Settings/Sensor routing MENU.
6. Check system operating pressures via the Carel
c.PCO controller (refer Appendix I).
7. Remove lint and dust accumulation from outdoor
coil ns with soft brush or low pressure water spray.
In corrosive environments, the checking and cleaning
frequency should be increased.
8. Touch up any paintwork damage to prevent corrosion.
