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Intelligent Defrost
By default, the arctic heat pump is designed to defrost itself as needed. The algorithm is factory supplied
based on optimized performance parameters for cold climate. These are based on coil temperature
differentials and compressor time run. When unit enters defrost it will go through various stages
including a reverse to cooling removing some heat from the buffer tank. This provides heat to the coils to
defrost any frost that has formed. When it finishes it will turn on the fan to hi speed to dry the coil before
resuming back to heating.
Enter Defrost Mode
1. When ambient temperature is detected to be ＞ -10℃ ), coil temp. is < -7, and unit has been working
for 45min, unit will enter defrost mode.
OR
2. When ambient temperature is detected to be as be 18℃ coil temp. is -10 C, and unit has been
working for 90min, or when unit has been working for 45min and ambient temperature - coil
temperature is ≥10℃ unit will enter defrost mode.
Exit Defrost Mode
Condition to exit defrost mode: when outdoor coil temperature reaches above 13 C or when defrost time
reaches 8 min setting.
Back Up Heating
The Arctic Heat Pump has an intelligent back up heating system that allow it to signal a backup heating
source when the heat demand exceeds the heat production such as during very cold temperatures. It
also has the ability to call on a backup heat source in case of a failure or emergency. The backup heating
control signal (closing of a dry contact E1, E2) is built into the unit and will function as follows.
Turn On
The backup heater will be called upon when all the items in a, b, c, d have occurred OR item e is met.
a. System is in Heating or Water Heating mode AND
b. Ambient temperature is <18ºC AND
c. Water tank temp setting– Actual Water tank temperature > 5 C AND
d. Compressor has worked for 30 consecutive minutes and temperature rise is less than 2 degree C.
e. System is in failure mode or compressor has been turned off for 5 min and no condition was
reached that would normally cause a Turn Off (see below)
Turn Off
1. The electric back up heater will turn off when any of the conditions have been met
a. Water tank temperature>= setting temperature OR
b. Unit is in cooling or defrost mode OR
c. “Emergency” or “AC Remote On” switch is (activated)
To connect the backup heater function (terminals) to a remote heating element you will need to use a
240 VAC contactor, as the system is not designed to provide power directly to a heating system due to the
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