Start The Heat Pump With Only Additional Heat; Important Points To Check After Start Up - Worcester GREENSTORE Instruction Manual

Commissioning the heat pump

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. Start the heat pump with heat from the electric heater only. The
heating system must have been fi lled and vented to run the heat pump with electric
heater only. Go to the menu display Select function only add. heat (menu 5.4) and
press the Select button. If the arrow points towards Normal operation press the Adjust
button. Turn the menu dial until the arrow points towards Only add. heat. Now press
the Save button. This function ensures that the electric heater heats both the central
heating water and the domestic hot water (DHW).

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 ampmeter
when the heat pump is producing hot water. Set the motor cut-out level 10% above the
highest measured value.
For the heat pump to perform at its best, it is important to check the fl ow on the
primary circuit of the heat pump. Usually, the heating system 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 primary circuit is
between 7-10 °C and on the collector circuit between 2-4 °C. 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 enough
to ensure 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 the system
pressure checked and topped up if necessary.
32
Commiss./Service
Select function
only add. heat 5.4
Return Select
Note
Do not forget to return this function
to normal mode.
Motor cut-out setting