Boiler Operation During Dhw - Hisense Hi-Therma Series Service Handbook

10.6.3 Boiler Operation during DHW

The configuration of this option should be done through the master controller.
Configuration →Complementary Heating →Boiler
Mark
DHW_B
It is possible to use boiler to heat up DHW when [DHW_B] set as [Enabled]. And [Point of DHW & SWP] should set as [After
Hydr S] to use boiler to heat up DHW. Refer to 10.1.
(1) Boiler will only be enabled when Average Outdoor Ambient Temperature < [Bivalent Point ]. The decision as to how to
operate will be made considering ambient temperature.
[Bivalent Point] refers to 10.6.2.
(2) Boiler can work on 2 different modes: [Parallel] and [Alternative].
[Parallel] and [Alternative] refers to 10.6.2.
● [Parallel]
Boiler works as complementary source and Boiler / heat pump work together to heat up DHW during cold outdoor
temperatures.
NOTE:
1. Boiler is allowed to work on mode of [Parallel] only when DHW Electric Heater is inactivated ([DHW_hts] set as [Disabled],
referring to 10.3.3) .
● [Alternative]
Boiler works as replacement source and heat pump stop working due to low efficiency during cold outdoor temperatures.
Boiler supplies all heat capacity.
NOTE:
1. Boiler works without requirement of [DHW_B] when work mode set as [Alternative].
(3) Boiler is only allowed to operate when more than [Waiting Time] has passed since Heat Pump starts.
[Waiting Time] refers to 10.6.2.
[Waiting Time] refers to 10.6.2.
NOTE:
1. [Waiting Time] is only available when Boiler working modes set as [Parallel].
2. DO NOT set boiler outlet water temperature too high that will make boiler start and stop frequently.
(4) Boiler Target temperature.
● Boiler working mode set as [Parallel]
Boiler Target temperature equals [Tmax].
[Tmax] refers to 10.2.2.3.
● Boiler working mode set as [Alternative]
Boiler Target temperature varies 60-65 °C.
(5) Boiler actual output refers to 10.6.1.
(6) Boiler Operation during special operation.
Boiler Operation during DHW Emergency operation (referring to 10.1.3.2) , HP Block operation (referring to10.9.5) , and
high outdoor ambient temperature as following:
Boiler will work on mode of [Alternative] without requirement of [Bivalent Point] to offer immediate heating capacity.
NOTE:
1. DHW Electric Heater has priority to supply DHW heating during special operation (6).
2. Boiler is allowed to work during DHW Emergency operation only when DHW Electric Heater is inactivated ([DHW_
hts] set as [Disabled] , referring to 10.3.3) or DHW Electric Heater is inactivated during DHW Emergency operation
([Emergency_DHW] set as [Disabled] , referring to 10.1.3.2.) .
3. Boiler works during DHW Emergency operation without requirement of [DHW_B].
4. Boiler works When average outdoor ambient temperature is more than 38°C-40°C , that is out of heat pump heating
operation range , and DHW Electric Heater is inactivated ([DHW_hts] set as [Disabled] , referring to 10.3.3).
Description Default Value
DHW by Boiler Disabled
Range
Disabled / Enabled
255
Control function
Steps Units