Commercial Air to Water Heat Pump Water Heater
13
HEAT PUMP IS NOT OPERATING
• Ambient temperature is cold– auxiliary
boost mode
If this method of low ambient temperature operation is
used the heat pump may not operate when the ambi-
ent temperature is below 41°F (5°C) and the auxiliary
water heater, if installed, will operate instead. The total
storage tank capacity will be heated to 140°F (60°C)
during these periods. Auxiliary boost will turn OFF
and heat pump will start operating as normal when
air temperature increases to 45°F (7°C) or higher.
• Thermal cut out activated
Has the thermal cut out for the heat pump compres-
sor activated?
If the thermal cut out has activated, the heat pump will
not operate for a period of 20 minutes to 2 hours and
display alarm on the control panel. The water heater
will make two more attempts to start. If the thermal cut
out is tripped again after the third attempt, the system
will enter lock out. If connected to a BMS, this will alert
the user that the unit is not operating.
To check whether there may be a problem, switch the
power to the water heater off and on again at the cir-
cuit breaker to the water heater, then open a hot tap
and allow to run for ten to fifteen minutes. The heat
pump, if working properly, will activate and continue
operating to heat the water. Close the hot tap when
the heat pump begins to operate.
However, if the heat pump deactivates within five min-
utes, there may be a problem. Contact your nearest
service technician.
• Incorrect Phase Rotation
The phase fail relay will open circuit if the heat pump
has been wired with incorrect phase rotation or if a
phase has failed. Both green and yellow LEDs on the
relay will be illuminated if all phases are available and
phase rotation is correct.
• Heat pump circulator has failed
If the heat pump circulator has failed, the heat pump
will not operate and may trip on a fault. Contact your
local service technician to arrange for an inspection.
HIGH ELECTRICITY BILLS
With the installation of your new air sourced heat pump
water heater, maximum electrical energy savings can be
achieved. Should you at any time, feel your energy ac-
count is too high, we suggest you check the following
points:
Is the relief valve in the storage tanks running excessive-
ly?
• Are outlets (especially the showers) using more hot
water than you think? (Refer to “Not Enough Hot Wa-
ter” on previous page).
• Is there a leaking hot water pipe, dripping hot water
tap, etc? Even a small leak will waste a surprising
quantity of hot water and energy. Replace faulty tap
washers, and have your plumber rectify any leaking
pipe work.
• Consider recent changes to your hot water usage pat-
tern and check if there has been any increase in tar-
iffs since your previous account.
• The heat pump water heater operates at its most effi-
cient at higher air temperatures. Prolonged periods of
low ambient temperature will decrease the efficiency
of the system and increase running costs.
IF YOU HAVE CHECKED ALL THE FOREGOING
AND STILL BELIEVE YOU NEED ASSISTANCE,
CONTACT YOUR LOCAL SERVICE TECHNI-
CIAN.
SAVE A SERVICE CALL
To Next Page
Loading...
