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DHW control
About DHW mode
DHW：domestic hot water
DHW MODE SETTING typically consists of the following:
1. DHW MODE: enable or disable the DHW mode
2. TANK HEATER: set whether the booster heater is available or not
3. DISINFECT：set the parameters for disinfection
4. DHW PRIORITY：set the priority between domestic hot water
heating and space operation
5 DHW PUMP: set the parameters for DHW pump operation. The
functions above apply only to installations with a domestic hot
water tank.
How to set the DHW mode
To determine whether the DHW mode is effective.
Go to MENU> FOR SERVICEMAN> DHW MODE SETTING. Press
OK. The following page is displayed:
1 DHW MODE SETTING
1.1. DHW MODE
1.2. TANK HEATER
1.3. DISINFECT
1.4. DHW PRIORITY
1.5. DHW PUMP
ENTER
OK
Use ◄ ► to scroll and OK for enter. When the cursor is on
YES, Press OK to set the DHW MODE as effective.
When the cursor is on
NON,press OK to set the DHW MODE
as ineffective.
1. Go to MENU> FOR SERVICEMAN>DHW MODE SETTING>1.1
DHW MODE
1.1 DHW MODE
dT5_ON
dT1S5
T4DHWMAX
T4DHWMIN
t_INTERVAL_DHW
SCROLL
Use ◄ ►and ▼▲ to scroll and adjust parameters. Use BACK to exit.
dT5_ON is the temperature difference for starting the heat pump,
the picture below illustrates the dT5_ON function.
T5
T5S
T5S-dT5_ON
OFF
ON
Compressor
T5S is the target temperature for domestic hot water. T5 is the actual
temperature of domestic hot water. When T5 drops to a certain
temperature (T5≤T5S-dT5_ON) the heat pump will be available.
dT1S5 is the correct value for the target outlet water temperature
(T1S=T5+dT1S5).
T4DHWMAX is the maximum ambient temperature that the heat
pump can operate at for domestic water heating. The unit will not
operate if the ambient temperature goes above it in DHW mode.
T4DHWMIN is the minimum ambient temperature that the heat
pump can operate for domestic water heating. The heat pump will
turn off if the ambient temperature drops below it in water heating
mode. The relationship between operation of the unit and ambient
temperature can be illustrated in the picture below:
YES
NON
YES
NON
YES
NON
YES
NON
YES
NON
SCROLL
5 °C
10°C
43°C
-10°C
5 MIN
OFF
t
Heat by TBH or AHS
T4DHWMIN
T_INTERVAL_DHW is the start time interval of the compressor in
DHW mode. When the compressor stops running, the next time the
compressor turns on it should be T_INTERVAL_DHW plus one
minute later at least.
2 If tank heater (booster heater) is avaliable, Go to FOR SERVICEMAN
>DHW MODE SETTING>1.2 TANK HEATER and select "Yes", when
"OK" pressed, the following page will appear:
1.2 TANK HEATER
dT5 TBH OFF
T4_TBH_ON
t_TBH_DELAY
SCROLL
Use ◄ ► and ▼▲ to scroll and adjust parameters. Use
BACK to exit.
dT5_TBH_OFF is the temperature difference between T5 and T5S
that turns the booster heater off. The booster heater will turn off
(T5≥T5S+dT_TBH_OFF) when the heat pump malfunctions.
T4_TBH_ON is the temperature only when the ambient temperature
is lower than its parameter and the booster heater will be available.
t_TBH_DELAY is the time that the compressor has run before
starting the booster heater (if T5＜min (T5S,T5stop)).
The operation of the unit during DHW mode described in the
picture below:
T5
T5S+dT5_TBH_OFF
T5S
T5stop
min(T5S,T5stop)-dT5_on
COMP.
TBH
In the picture, T5stop is a parameter related to ambient temperature,
which cannot be changed in the user interface. When T5≥T5stop,
the heat pump will turn off.
Note: the booster heater and backup heater can't operate
simultaneously, if the booster heater has been on, the backup
heater will be off.
If the booster heater is unavailable (1.2 TANK HEATER NON is
selected), the dT5_ON cannot be adjusted and is fixed at 2.
3. To enable disinfect function,Go to MENU> FOR SERVICEMAN>
DHW MODE SETTING>1.3 DISINFECT and select "YES", when "OK"
pressed, the following page will appear.
1.3 DISINFECT
T5S_DI
t_DI_HIGHTMEP.
t_DI_MAX
SCROLL
40
Heat by heat pump
OFF
T4DHWMAX
5 °C
20°C
90 MIN
ON
OFF
ON
OFF
OFF
t_TBH_delay
5 °C
30 MIN
120 MIN
V.2
T4
Time
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