68
FOR THE INST
ALLER
Commissioning the heat pump
Manual test run of the heat pump
Instead of starting the heat pump directly in normal mode, you can
manually test run the pumps and valves. This is recommended as in this
mode you can easily fi nd any possible faults. In the menu display
Manual
operation of all functions
(menu 5.3) you can run all functions manually.
Press the Select button to start test operations. When you exit from the
menu display the heat pump returns to normal mode.
Start the heat pump with only additional heat
It might be necessary to run the heat pump before work on the heat
transfer fl uid circuit is complete. You can then start the heat pump with
only additional heat You must have fi lled and vented the heating system to
run the heat pump with only additional heat. Go to the menu display
Select
the function only additional heat
(menu 5.4) and press the Select button. If
the arrow points towards Normal mode press the Adjust button. Turn the
menu dial until the arrow points towards
Additional heat only
. Now press
the Save button. This function ensures that additional heat heats both the
hot water and the heating water.
Important points to check after start up
In the fi rst period after commissioning particular attention should be paid
to the pressure and levels in the heat distribution and heat transfer fl uid
circuits. After a short period of operation it may be necessary to top up the
heat transfer fl uid.
On delivery the motor cut-out setting is determined by a value produced
during hot water charging and a stable voltage. The recommended motor
cut-out setting may not always be suitable as the voltage in the mains
can fl uctuate. The setting may therefore, from case to case, need to be
adjusted. Adjust the setting using a clip-on ammeter when the heat pump is
producing hot water.
For the heat pump to perform at its best, it is important to check the fl ow
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 systems. A recommended temperature difference over the heat pump
on the hot side is between 7-10 °C and on the cold side between 2-4 °C.
You check this by going to menu display 3 and reading the sensors T8
(GT8) and T9 (GT9) as well as T10 (GT10) and T11 (GT11).
It is important in systems with a bypass that the fl ow in the heating system
exceeds the fl ow over the heat pump. If this is not the case, the heat pump
fl ow goes back via the bypass to the heat pump return, which may cause
the heat pump to give an alarm for a high return temperature. The fl ow
over the heating system should be so great that the entire radiator surface
is kept warm. In this way the heat emitting surface increases and in doing
so the fl ow temperature from the heat pump is kept down.
The heating system should be vented once again after test operations and
then fi lled with cold water if necessary.
Note
Do not forget to return this function to
normal mode.
Commiss./Service
Manual operation of
all functions 5.3
Return Select
Commiss./Service
Select function
only add. heat 5.4
Return Select
