© Ecotec Heat Pumps Ltd
|
Installation Manual & User Guide
8
Commissioning the Heat Pump
1)
Before the heat pump goes into service, the
heating system must be filled up and
completely vented.
2)
Check that there are no leaks in the system.
3)
Always ensure that circulation pumps are
on and that there is heat medium
circulation when connecting to an existing
water system.
4)
With in-floor heating
: turn off all but one of
the circuits in the building for
commissioning.
5)
With radiators
: turn off half the radiators in
the building for commissioning.
6)
With fan-assisted radiator system
the fans
in the radiator are controlled and the valves
on the fan-assisted radiators are opened
fully. In a fan assisted radiator system, the
water volume is small. During defrosting
the heat pump will draw heat from the lines
cooling it down temporarily. It is important
that the fans in the radiators run during
defrosting. It is recommended that an
expansion tank of at least 100 Liters (25
gallons) is used to increase water volume to
reduce cooling effect during defrosting.
7)
Turn the room thermostat up to 30°C. The
return water temperature is displayed on
the controller. Wait for the temperature to
read 43°C (radiators) or 33°C (in-floor) and
then open each radiator or zone one at a
time, waiting for the return water
temperature to rise each time.
8)
Once the whole system is open allow the
water temperature to rise to the normal
operating temperature of 50°C to 60°C for
radiators or 35°C for in-floor heating.
9)
The unit may go into defrost during the
commissioning due to low temperatures.
This is normal and there may be small drops
in the water temperature during defrost
cycles.
Operating temperatures
Maximum
: The heat pump can operate up to a
maximum return temperature of about 60
C. Above
that temperature the heat pump stops for reasons of
safety.
The maximum outgoing temperature from the heat
pump is about 65
c. Depending on the outdoor
temperature. Higher temperatures can be achieved
by using an auxiliary heating system.
Minimum:
The heat pump is designed to operate to
-15
C; at temperatures below this point an auxiliary
heating system will be required.
NOTE: On 3 phase units it is possible for the
scroll compressor to run backwards. This
becomes obvious on start up, there will be no
significant rise in water temperature from the
unit.
(Normal rise approximately 1°C per minute)
The top of the compressor will not become
warm and it may be excessively noisy. If this
happens, switch off the mains power and
exchange two of the supply phases this will
correct the rotation.
