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3.12 Commissioning
The following tasks must be completed in order to commission the ground source heat pump:
3.12.1 Recorded Details
The following details must be recorded in the commissioning certificate.
Householder’s Name and Address
Installation Date
Installing Engineer
Commissioning Date
Commissioning Engineer (Name and registered company)
Unit Type (AS01, AS02 or AS03)
Serial Number
Heating System Details (no. of zones, underfloor heating pipe spacing, radiators etc.)
Inhibitor Type (brand of inhibitor and dosing)
DHW Cylinder Details (brand and model number, capacity, heat exchanger details)
The time and date must be set.
3.12.2 Testing Flow Rate
The heating circuit must be fully installed, filled, purged and pressure tested. The pressure
should be set at around 1 bar. It is essential that all air has been expelled from the circuit and
that adequate flowrates are achievable.
3.12.3 Weather Compensation Mode
Weather compensation works by adjusting the heat output of the heat pump to match the
current heat loss of the building. This is achieved by adjusting the heating flow temperature
according to the outdoor temperature. As the outdoor temperature drops, the heating flow
temperature is increased and vice versa. The outdoor temperature is monitored by an external
temperature sensor installed on the back of the unit.
The default setting of the heat pump has weather compensation enabled. If a fixed flow
temperature is required, the weather compensation can be disabled by the commissioning
engineer. Weather compensation can be disabled by setting parameter R20 to 55°C. When
enabled, parameter R20 should be set to -5°C. However, this is not recommended and should
only be undertaken in consultation with Warmflow. If weather compensation is disabled, the
SAP assessment (EPC) is invalid. A commissioning certificate and label must be provided that
confirm this disablement.
The weather compensation curves for flow temperature set points of 35°C, 45°C and 55°C are
shown in the chart below. The flow temperature setpoint should be adjusted to match the
calculated flow temperature requirement at the design day temperature. The default flow
temperature setting is 35°C.
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