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6. TROUBLESHOOTING
6.1 Room temperature varies significantly from its
setting
• Unit may have been incorrectly sized for the load,
or the external water system is limiting the unit's
performance.
• Unit may be in a protection or diagnostic failure
mode (refer 6.6 below).
6.2 Unit 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, floor and ceiling increase.
• Check the unit’s brochure for information on the
minimum/ maximum operating temperatures.
• Check the supply water temperature is appropriate
for the installation (refer MWH Applications Manual)
6.3 In a new building, why does it take some days
before the heat pump unit seems to work properly?
• Many new 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.
• Allow sufficient amount of time for unit to heat the
floor. This could be up to 60 hours. Start heating well
before you need the warmth most.
• Units need to be checked regularly to ensure proper
operation and that they are not exceeding operating
limits for any length of time.
6.4 Unit runs excessively – the temperature remains
too cold in winter.
• Windows or doors may be opened to non-heated
areas.
• Keep doors to unheated areas (eg laundries,
bathrooms etc.) closed.
• Location of wall controller or remote temperature
sensor is wrong.
• Check top air discharge is unblocked and air flow to
the coil face is clear and not restricted or blocked.
• Check no ice is forming on the coil between de-ice
cycles (Refer 7.10).
6.5 Unit stopped and displaying 'HP' fault code
The most likely reason is insufficient purging of air
through the system. Repeat the above steps to purge
air from the system (Refer 4.1). Should this unit again
result in a HP fault, then keep the hose connected on
unit start-up, and open the purge port with the internal
passage closed (filling port) / partially disconnect the
return water pipe, and close the return side ball valve.
The unit should operate. Once the unit is operating
normally, then close the internal passage and purge port.
Note: Cold water in the system is more likely to result
in air-locks than warm water. Once the water heats
the air will tend to be naturally removed through the
automatic air-bleed. Cooler water absorbs air, and
heating water will release it. Installing the air-bleed on
the supply water side of the manifold allows the air
to be removed prior to the water entering the plastic
tubing. It is normal for the system pressure to reduce
over several days as the remaining air is eliminated
from the system. Return to site, and re-pressurize,
ensuring that the water hose is free of air prior to
connecting to the filling port.
6.6 Unit displays an error code:
Refer to UC8 Controller label on the unit for
operation & fault diagnostics information; or
visit www.temperzone.biz and model search
'UC8 Controller'. Here you will also find a 'UC8
Troubleshooting Guide'.
6.7 Unit Does Not Start
• Circuit breaker may have been tripped. Reset circuit
breaker.
• Unit may be off or in wall thermostat mode. Check
unit is switched on at the unit, and external
temperature controller is in Heating mode.
• Unit may be in a protection or diagnostic failure
mode. Check for fault code display on unit's
controller board (refer also 6.5).
6.8 Water Dripping Outside
Condensation released during unit operation is normal.
The unit should have been drain connected at the time
of installation (refer 2.3)
• Check drain line is unblocked.
• If a condensate drain has been installed and is
connected to a drain system, check gaskets and
fittings around drain for leaks and plugs.
6.9 Ice or Frost Forms On Unit's Coil
Under normal operation in cold conditions the coil
will at times change to a white appearance as a
frost forms. The unit is programmed to de-ice no
more frequently than once every 50 min. At the end
of each de-ice cycle, the coil should be completely
clear of ice. Should a layer of clear ice form on
the coil, then contact your Installer or Temperzone
Customer Service (www.temperzone.biz).
8 WARRANTY
Please refer to the separate warranty document supplied with the unit, or visit
www.temperzone.biz
for details.
Australia:
New Zealand:
nztechnical [email protected]
Telephone: 0800 TZWARRANTY (899 2777)
Telephone: 1800 21 1800
NOTE Specifications are subject to change without notice due to the manufacturer's ongoing research and development programme.
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