COMMISSIONING
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12.4 POST COMMISION CHECKING
To safeguard the optimum system function, check the
temperature on the hot side of the heat pump. The
recommended value lies between 5 and 10 °C.
Checking the temperature differential:
B
Check the displayed values for temperature sensor T8
(Off) and temperature sensor T9 (On).
The temperature differential should be between 5 and
7 °C if you commission the system at an outside
temperature below 0 °C.
The temperature differential should be between 8 and
10 °C if you commission the system at an outside
temperature in excess of 15 °C.
The flow rate in the heating system must be adequate to
fully heat all radiators. This maximises the heat radiating
surface and keeps the flow temperature low.
B
Vent the heating system after the test run and top up
with water if required (
Æ
chapter 7.10).
12.4.1 SOFT STARTER
The soft starter has two indication LEDs on the cover.
The green LED indicates the status of the power supply
and the red LED indicates an alarm condition.The soft
starter is located in the electrical box of the heat pump.
12.4.2 SYSTEM FLOW
For the installation to perform at its best, it is important
to check the flow on the hot side of the heat pump.
Usually, the heat carrier pump has a speed selector
switch. This must be set correctly for the pressure drop
in the system. A recommended temperature difference
across the heat pump on the hot side is between 5-10ºC.
The nominal flows provided in Technical information
shows a difference of 7ºC in operating mode +7/45ºC.
Check this by reading the sensors T9 (heat transfer fluid
in) and T8 (heat transfer fluid out). When commissioning
is carried out at a low outdoor temperature (below 0ºC)
the temperature difference should be between 5ºC and
7ºC. When commissioning is carried out at an outdoor
temperature above 15ºC the temperature difference
must be between 8ºC and 10ºC. The flow through the
heating system should be sufficient to keep the whole
radiator warm and thereby increase the heat emitting
surface. This means that the flow temperature is kept
low. After testing, vent the heating system again and top
up with cold water if necessary. See Filling the heating
system.
Condition
Green LED
Red LED
Effect
Normal Conditions
ON
OFF
-
Mains voltage <90VAC
Flash
OFF
Soft starter prevents the
start
Mains voltage <190VAC;
>1 sec (running condition)
ON
ON
Prevented operation as
long as Mains voltage
<190VAC
Mains voltage restored
(>190VAC)
ON
Flash (2.5 Hz)
Prevented operation for 5
min then restart
Overcurrent >80A for 1
sec.
ON
Flash (0,25 Hz)
Prevented operation for 5
min then restart attempt.
If still overcurrent after
second attempt prevented
until manualy reset.
Tab. 6 Soft starter
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