250
Control function
(1) Heater will only be enabled when Average Outdoor Ambient Temperature < [Bivalent Point ]. The decision as to how to
operate will be made considering ambient temperature.
(2) Electric Heater is only allowed to operate when more than [Waiting Time] has passed since Heat Pump started.
Capacity
boiler
heater
Heat pump
EHb
Average Outdoor ambient temperature
Heater load factor
WTEH
Space hea�ng demand
Heat pump start
ISWT ISWT
Step3
Step2
Step1
Heater output
(3) Heater Target temperature.
Heater Target temperature=Maximum value of Target outlet water temperature- [Hdif] °C
Maximum value of Target outlet water temperature refer to 10.2.2.3.
(4) Heater load factor and Actual heater output refer to 10.5.1.
(5) Heater Operation during space heating Emergency operation.
Heater Operation during Emergency operation (referring to 10.1.3.2) as following:
①
Forcing o Auxiliary electric heater by DSW4-7:ON is invalid when space heating Emergency operation.
②
Auxiliary Electric Heater will operate with Heater Target temperature equaling Maximum value of Target outlet water
temperature and without requirement of [Bivalent Point ] & [Waiting Time] to oer immediate heating capacity during
Emergency operation.
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