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Control function
NOTE:
1. Max. DHW operation time of [HP ON Max. Time] will be add extra 70 minutes to heat up DHW in one period time of
DHW operation shift When DHW schedule priority is activated at specic setting Starting Time. Take the extra time into
consideration when setting DHW Electric heater waiting time of [DHWEH]. Refer to 10.1.2.1.1.
(2) [DHW_ht_mode] is set [H.Demand]
DHW is heated up by heat pump and DHW Electric Heater in parallel when [DHW_ht_mode] is set [H.Demand]. Whenever
heat pump and DHW Electric Heater meet operating conditions, they will work to heat up DHW.
TDHW≦TDHWS- DHW_HP_diff Or
TDHW ≦ TDHWS- DHW_Ht_diff
THPSTOP
TDHWS
TDHW/TDHW1
Heat pump ON
DHW Electric Heater ON
TDHW1≦TDHWS- DHW_HP_diff if
TDHW1is valid.
NOTE:
1. When average outdoor ambient temperature is more than 38°C-40°C , that is out of heat pump heating operation range ,
DHW Electric Heater will operate on mode of [H.Demand] even if setting as mode of [Standard].
(3) Maximum DHW operation time by heat pump: [DHW_HP_tmax]
This function of [DHW_HP_tmax] controls the maximum time that DHW operation can work using Heat Pump. DHW Electric
Heater operation is not aected by it. For example the heater will continue to heat up DHW as [DHW_ht_mode] is set
[Standard] after heat pump is stopped by the function of [DHW_HP_tmax] . Heat pump will be able to operate again to heat
up DHW after heat pump o time of [DHW_HP_cycle].
This function of [DHW_HP_tmax] is applied when [DHW_ht_mode] is set [Standard] or [H.Demand].
TDHW≦TDHWS- DHW_HP_diff Or
TDHWS
TDHW/TDHW1
DHW Electric Heater ON
Heat pump ON
DHW_HP_tmax
DHW_HP_cycle
TDHW1≦TDHWS- DHW_HP_diff if
TDHW1is valid.
Where:
TDHWS: DHW Setting temperature (ºC).
Tmax: Heat pump maximum temperature (dened by unit working range), Refer to 10.2.2.3.
THPSTOP: Temperature which the heat pump stop heat the tank.
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