Water Heater, Dhp-H, -C; 12.10 Water Heater, Dhp-A, -Al - Danfoss DHP-H Installation And Service Instructions Manual

12.9

Water heater, DHP-H, -C

Danfoss heat pumps DHP-H, -C, are supplied with an integrated 180 litre water heater.
Hot water production is prioritised ahead of heat production, i.e. no heat is produced when there is a hot water demand at the same time.
The temperature of the hot water cannot be adjusted. Normally, hot water production does not cease at a determined temperature but
when the compressor's operating pressure switch reaches its maximum operating pressure, which corresponds to a hot water temperature
of approximately 50-55°C.
Using a regular time interval, the water in the water heater is given extra heat by the integrated auxiliary heater to prevent the build up of
bacteria (anti-legionella function). The factory set time interval is seven days (can be adjusted). When the anti-legionella function is active
the heat pump produces hot water until the temperature for the start temperature sensor (5) has reached 60°. If the heat pump cannot
raise the temperature sufficiently within 3.5 hours the control checks if there is any heating requirement, before the anti-legionella function
tries again.
In the control computer's TEMPERATURE menu, a number of measured and calculated temperatures for the hot water and supply are
displayed. The current hot water temperature (2) and the temperature of the supply line during heating and hot water production is dis-
played. The temperature of the supply line often exceeds the maximum permitted hot water temperature, but usually during hot water
production.

12.10 Water heater, DHP-A, -AL

The hot water heaters for DHP-A,-AL differ from the other heat pumps in that the function for defrosting of the outdoor unit is different.
The 180 litre hot water heater has a defrosting tank (mantle) on the outside of the heater that contains heated brine (approx 47 litres)
which is used during defrosting.
The difference between a DHP-A, -AL is only that the water heater is integrated in DHP-A and is a separate unit for DHP-AL.
Position Name
1 Hot water line
2 Temperature sensors
3 Water heater
4 TWS coil
5 Start temperature sensor
6 Return from TWS coil
7 Filler pipe
8 Flow line to TWS coil
Figure 81:
Position Name
1 Tap hot water
2 Temperature sensors
3 Defrosting tank
4 Water heater
5 TWS coil
6 Filler pipe
7 Flow line to TWS coil
8 Expansion outlet when outdoor
unit is positioned at high level
Figure 82: Water heater for DHP-A and DHP-AL.
1
2
3
4
5
6
Water heater in DHP-H and DHP-C.
1
2
3
4
5
VMBMA602
7 8
6 7
8
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