Danfoss DHP-A Installation Manual page 23

Installation Guide
5.2.2 System solution 2
Description
In system solution 2, the heat pump can produce both heat and hot water and an external auxiliary heater (oil boiler, electric boiler,
district heating or similar) supports heat production but not hot water production. The exchange valve for heating/hot water is located
ahead of the external auxiliary heater, which allows the production of heating and hot water at the same time.
The integrated immersion heater can be used for heating and hot water production as well as for antilegionella. The values of the inte-
grals, A2 and A3 are used to select if the external auxiliary heater is to step in before or after the integrated immersion heater.
The heat pump control computer also controls an additional shunt located after the external addition.
For system solution 2, select in menu SERVICE\AUX. HEATER\EXTERNAL ADDITION:
▪ EXT.AUX.HEATER = ON
▪ REV.V. HOT WATER = INT
Example system solution 2
System solution for DHP-H, DHP-H Opti, DHP-H Opti Pro, DHP-C Opti, DHP-C Opti W/W, DHP-A, DHP-A Opti.
Danfoss Heating Solutions
Domestic heat pumps
1 Heat pump
10 Supply line
11 Return line
12 Cold water
13 Hot water
36 Circulation pump
51 Supply line sensor, moved out from heat pump
72 Shunt valve
80 Shut-off valve
83 Non-return valve
85 Air bleeding valve
86 Safety valve expansion heating system
87 Safety valve cold water 9 bar
89 Vacuum valve
91 Dirt strainer with shut off valve
96 Flexible hose
113 Expansion heating system
117 External auxiliary heater
126 Safety valve for temperature and pressure (only applies to certain models)
VMGFQ102
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