Heating And Defrost Functions - Danfoss DHP-AX Installation And Service Instructions Manual

11.2

Heating and defrost functions

11.2.1 Heating
DHP-AX is a heat pump that can produce heating for houses and water heaters. Hot water production is active
all year round but during the summer heat production to the house is stopped when the outdoor temperature
reaches the value for HEAT STOP.
Low pressure
Refrigerant sensor 1
Outdoor air
During the winter, hot water and heat is produced for the house by the compressor until the outdoor tem-
perature reaches the value for OUTDOOR STOP when it becomes too cold for the compressor to operate. If an
auxiliary heater has been installed, it is used to produce hot water and heating for as long as OUTDOOR STOP
applies.
DHP-AX defrosts the air heat exchanger automatically if required.
22 – Service
Pressostat Service output
Bulb
Compr.
Fan
Refrigerant sensor 2
Figure 16: The refrigerant circuit's function during heat production.
Pressure pipe Pressostat
sensor High pressure
4-way valve in
heating mode
2-way
Drying filter
exp.valve
VMBMH302
Hot
Cold
Refrigerant sensor 3
Heating system
hot supply
Heating system
cold return