Hisense AHM-080HCDSAA - DHW Operation with DHW Electric Heate; DHW Operation by Heat Pump and Heater

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Control function
10.3.3 DHW operation with DHW Electric Heate
DHW Electric Heater (DHW EH) is on-site accessory to deliver additional heating capacity during cold outdoor
temperatures. The electrical heater can also be used for emergency operation in case of outdoor unit malfunction.
NOTE:
1. For DHW Electric Heater Optional Output signal need be congured as function of [DHW Electric Heater] to drive relay.
The power supply of DHW Electric Heater connects to terminals HL-HN and build-in Safety thermostat of DHW Electric
Heater connects to terminals L1-I12 (DHW The2).
The conguration of this option should be done through the master controller.
Conguration →DHW→ DHW Electrical Heater
Mark Description Default Value Range Steps Units
DHW_hts Status Disabled Disabled /Enabled
DHW_ht_mode mode Standard Standard/ H.Demand
DHWEH Waiting Time 45 0~250~unlimited 1 min
DHW_ht_di󰀨 ON Di󰀨erential Temp 6 1-10 1 °C
(1) DHW Electric Heater is activated when [DHW_hts] is set as [Enabled].
(2) DHW Electric Heater can be forced o󰀨 if DSW4-3: OFF. Forcing o󰀨 DHW electric heater by DSW4-3: OFF is invalid
when DHW Emergency operation (referring to 10.1.3.2), DHW Boost operation (referring to 10.3.6), DHW Anti-legionella
operation (referring to 10.3.5) or HP Block operation (referring to10.9.5). The heater is forced o󰀨 with factory setting. Set
DSW4-3: ON to cancel forcing o󰀨 through the Dip switch on PCB1.
(3) DHW Electric Heater can heat up DHW on 2 di󰀨erent modes: [Standard] and [H.Demand].
● Standard: DHW will be heat up by heat pump prior to DHW Electric Heater when water temperature in the tank [TDHW]
/ [TDHW1 if TDHW1 is valid] is low enough to start up the heat pump. Then DHW Electric Heater will start to heated up
DHW when water temperature in the tank is too high to run the heat pump. This is an e󰀩cient way to use energy.
● High Demand: DHW Electric Heater operation starts if water temperature in the tank [TDHW] and DHW setting
temperature [TDHWS] di󰀨erence is larger than di󰀨erential temperature [DHW_ht_di󰀨]. DHW can be heated up using the
heater, heat pump, or a combination of both without priority. This is fast way to heat up DHW.
(4) [DHWEH]: DHW Electric heater waiting time, after that time heat pump heats up DHW and Heat Pump cannot give
enough capacity it will be necessary to start Heater in order to supply additional capacity. Then DHW Electric Heater
starts. [DHWEH] only available when [DHW_ht_mode] is set as [Standard].
(5) [DHW_ht_di󰀨]: Hysteresis for the start of DHW heating operation with DHW Electric Heater.
10.3.4 DHW operation by heat pump and Heater
(1) [DHW_ht_mode] is set [Standard]
DHW is heated up by heat pump and DHW Electric Heater sequentially When [DHW_ht_mode] is set [Standard]. Low
temperature part of DHW is heated up by heat pump until max temperature of THPSTOP or DHW Electric heater waiting
time[DHWEH], and then the remain high temperature part of DHW is done by DHW Electric Heater.
TDHW≦TDHWS- DHW_HP_diff Or
THPSTOP
TDHWS
TDHW/TDHW1
Heat pump ON
DHW Electric Heater ON
DHWEH
TDHW1
≦TDHWS- DHW
_HP_diff if
TDHW1 is valid.