6 User Guide
6. BASIC FUNCTIONS
Domestic Hot Water:
If there is a domestic hot water (DHW) cylinder installed and
the temperature of the DHW cylinder is less than the hot water
setpoint, the primary heat pump circuit is activated and directed
(via the divertor valve) to heat the hot DHW cylinder.
The heat pump will operate until the DHW cylinder has reached
its setpoint. This function will always take priority over the space
heating system within the programmed time.
Note: Domestic hot water heating and space heating functions
cannot operate simultaneously.
Space Heating:
If there is a heating demand and the temperature of any
thermostat is less than its setpoint, the primary circuit is
activated and directed (via the divertor valve) to heat the space
heating circuits. The heat pump and primary heating circuit
circulator will be active until the space heating has reached its
setpoint.
Note: Domestic hot water heating and space heating functions
cannot operate simultaneously.
Anti-Legionella:
If there is a DHW cylinder installed, anti-legionella measures
should be utilised in accordance with HSE guidance HSG274
Part 2. The control system is provided with an anti-legionella
function for the DHW cylinder, the default parameter, which is
adjustable according to the installation and user requirements,
initiates this function once per week and heats the DHW
cylinder to 60°C for a period of 1 hour.
Monobloc ASHP Defrost Method:
During operation, the heat pump will periodically be required
to go through an automatic defrosting process dependent on
the outdoor air temperature and humidity levels. Over time
the evaporator will begin to collect water which will then frost.
The defrost process causes the accumulated frost to thaw and
change to liquid. This liquid water then collects in the base
located on the base panel of the heat pump. Dependent
upon the installation type, the water will drain to ground or a
dedicated drainage point.
Frost Protection (Dwelling):
Frost protection is controlled in accordance with the outdoor
temperature, and water temperature sensors on the outdoor
unit. When the frost protection occurs, the outdoor unit displays
the error code Pb and the unit will stop operating.
Frost protection will activate under either of the following
conditions:
- Outdoor temperature < 3°C & minimum water
temperature < 5°C
- Minimum water temperature < 2°C.
Once either of these conditions are met, the primary circulator
the compressor will run for a 10 minutes until the minimum
water temperature is > 15°C.
If the water temperature is < 8°C and there is normal water
applicable) will operate until the minimum water temperature is
met.
The compressor will operate for a minimum period of 10
minutes until the minimum water temperature is > 15°C.
An auxiliary heat source will be active for a minimum period of 5
minutes until the minimum water temperature is > 10°C.
Weather Compensation:
to the external ambient temperatures. The lower the outdoor air
7. CONTROLLER AND DISPLAY FUNC-
TIONS
The Heat Pump controls are a centralised controller for all
systems settings including domestic hot water schedule and
temperature control.
For space heating schedule and temperature controls please
refer to the instructions supplied with your Programmable Room
Thermostat (PRT).
Should there not be a programable room thermostat control
device.
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