Domestic Hot Water Heat Pump Service Manual
17
7.3
P3 BOOST mode
This is the standard operation mode for the domestic hot water heat pump.
The
temperature is set from main menu, by pressing the ’OK’ button.
Select ‘A Temperatures’ and then A2 ECO to set temperature for eco mode, default set point is
50°C.
As long as the air inlet temperature, BT1, is within the specified temperature range, default -7 ~
+40°C then the DHW-HP will operate normally, if BT1 temperature is outside of its operating range
then the water will be heated using the electrical heater only.
Code
Set Point
Name
Description
Range
Factory
setting
A3
T BOOST
The temperature level at which the DHW-HP
heats the water when BOOST mode is selected.
50 ~ 65
55
The DHW-HP will then heat the water to set point using the heat pump and the electrical heater
together.
If A3 T BOOST temperature is set higher than D33 (Temp HP max
– default 60°C) then the
remaining temperature above this set point is reached by electrical heater only operation
If the water temperature, BT3, reduces by 5°C then the EL heater will start to reheat the water
temperature back to set point.
The HP requires the BT3 temperature to reduce to 5°C below D33 (Temp HP Max SP)
In this case 8°C below BOOST mode temperature set point (A3 = 63°C).
NOTE:
A3 T BOOST set to 63°C for illustration purposes.
NOTE:
Volume of water heated by EL heater is only a percentage of the full water volume, as
follows: 190l = 75l (40%)
260l = 130l (50%)
0
10
20
30
40
50
60
70
80
90
100
00
:0
0:
00
00
:0
4:
20
00
:0
8:
40
00
:1
3:
00
00
:1
7:
20
00
:2
1:
40
00
:2
6:
00
00
:3
0:
20
00
:3
4:
40
00
:39
:00
00
:4
3:
20
00
:4
7:
40
00
:5
2:
00
00
:5
6:
20
01
:0
0:
40
01
:0
5:
00
01
:0
9:
20
01
:1
3:
40
01
:1
8:
00
01
:2
2:
20
01
:2
6:
40
01
:3
1:
00
01
:3
5:
20
01
:3
9:
40
01
:4
4:
00
01
:4
8:
20
01
:52
:40
01
:5
7:
00
02
:0
1:
20
02
:0
5:
40
02
:1
0:
00
02
:1
4:
20
02
:1
8:
40
02
:2
3:
00
02
:2
7:
20
02
:3
1:
40
02
:3
6:
00
02
:4
0:
20
02
:4
4:
40
02
:4
9:
00
02
:5
3:
20
02
:5
7:
40
03
:0
2:
00
03
:06
:20
03
:1
0:
40
03
:1
5:
00
03
:1
9:
20
03
:2
3:
40
03
:2
8:
00
03
:3
2:
20
03
:3
6:
40
03
:4
1:
00
03
:4
5:
20
03
:4
9:
40
Te
m
p
e
rat
u
re
(
°C)
T1 T air in
T3 T water top
HP_OnTemp
HP_OffTemp
E_HeatOnTemp
E_HeatOffTemp
R3 Fan
R4 HP
R5 El Heater
Fan OFF
Fan ON
HP OFF
HP ON
EL Heat OFF
EL Heat ON