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8.4
Operating temperatures
The operating temperature check must be performed in heating mode
(not in DHW or cooling mode).
For optimum system operation, the flow rate in the heat pump and
heating system must be monitored. This check should be performed
after 10 minutes heat pump operating time and during high compressor
heating output.
The temperature differential for the heat pump must be set for the
different heating systems.
▶ With underfloor heating system: set a temperature difference of
4.5 K.
▶ With radiators: set a temperature difference of 7.5 K.
These settings are optimal for the heat pump.
Check the temperature differential at high compressor heating output:
▶ Tap on the Heat Pump symbol on the display.
▶ On the System overview, notice the temperatures to and from the
heat pump (outdoor unit).
▶ Check whether the temperature difference corresponds to the delta
value set for heating mode.
If the temperature differential is too large:
▶ Vent the heating system.
▶ Clean filters / strainers.
▶ Check pipe dimensions.
Temperature differential in the heating system
▶ Set the output at the heating pump PC1 so that the following
difference is achieved:
▶ With underfloor heating system: 4.5 K.
▶ With radiators: 7.5 K.
8.5
Function test
The compressor is preheated before starting. This can take up to
30 minutes, depending on the outdoor temperature. The prerequisite
for starting is that the compressor temperature (TR1) is 20K higher than
the supply air temperature (TL2) and 20K lower than the flow
temperature from the heat pump (TC3). The set point is limited between
20 °C and 45 °C. The temperatures are displayed in the diagnosis menu
of the control unit.
Quick start of the heat pump is only possible when there is an active heat
demand.
Repeated use of this function can lead to reduction of compressor
lifetime
The manual defrost of the heat pump is only possible when the
compressor is running with the 4-way valve in heating mode and the
outdoor temperature is below 15 °C.
When the function test menu is activated on the control panel, software
restrictions are deactivated (i. e. high temperature protection for under
floor heating).
Pre plumbed cylinder – 6 721 852 928 (2023/04)
▶ Test active components of the system.
▶ Check if there is a heating or hot water demand.
-or-
▶ Draw off DHW or increase the heating curve to generate demand (
instructions for control unit).
▶ Check whether the heat pump starts.
▶ Make sure that no alarms are currently active.
-or-
▶ Troubleshooting.
▶ Check the operating temperatures ( instructions for the control
unit).
8.5.1
Overheating protection (OHP)
The overheating protection triggers when the temperature of the electric
booster heater rises above 88 °C.
▶ Make sure that the particle filter is not blocked and that the flow
through the heat pump and heating system is unimpeded.
▶ Check the operating pressure.
▶ Check the heating and DHW settings.
▶ Replace electric heater and cover
8.6
Finishing commissioning
8.6.1
Appliance/product guarantee
This appliance/product has a guarantee against faulty materials or
workmanship for a period from the date of installation subject to the
terms and conditions.
For full terms and conditions, please visit:
www.worcester-bosch.co.uk/guarantee-terms-and-conditions
Guarantee registration
Your appliance/product carries a guarantee against faulty material or
manufacture subject to Terms and Conditions.
To read the full Terms & Conditions please visit us on-line at
www.worcester-bosch.co.uk/guarantee.
Your statutory rights are not affected by the manufacturer's guarantee
Commissioning
33
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