VWBMD102Electrical Installation Instructions DHP-R – 2
Danfoss DHP-R 20 . . . . . . . . . . . . . . . . . . . . . 4–10
Danfoss DHP-R 26 . . . . . . . . . . . . . . . . . . . .11–17
Danfoss DHP-R 35 . . . . . . . . . . . . . . . . . . . . 18-24
Danfoss DHP-R 42 . . . . . . . . . . . . . . . . . . . . 25-31
Danfoss DHP-R 21 H . . . . . . . . . . . . . . . . . . 32-38
Danfoss DHP-R 25 H ..................39-45
Electrical Installation
Danfoss DHP-R heat pumps are internally prepared at the factory. The wiring that requires connec-
tion are the power supply (5 core) and the wiring between the outer control cabinets and the heat
pump.
No separate operating voltage needs to be connected to the heat pump, however, if required a
separate operating voltage can be connected to the terminal block marked 2L1 and the bridge
between L1 and 2L1 can be removed. If separate operating voltage is supplied, it must be clearly
marked that external voltage is attached to the heat pump, if the operating power is not connected
through the same circuit breaker as the power supply.
All wiring must be routed according to the applicable regulations under the supervision of an elec-
trician and dimensioned to the applicable regulations, observe any local regulations, contact the
power company if uncertain.
On the rear side at the left-hand lower edge there are cable lead-ins.
The electrical installation must occur with the fixed prelaid cables and an all pole circuit breaker in
the fixed installation.
NOTE! Bridge between terminal block 123 and 124
When connecting a pressure or flow switch in the coolant circuit, remove the bridge between ter-
minal block 123 and 124 (this bridge is connected at the factory)
If the coolant pump is to be started and stopped via separate external switch (passive cooling), this
is connected to terminal block 127-128, potential free connection.
WARNING! The circuit breaker must be switched off to stop the current to the heat pump.
NOTE! The control computer sensor cables transfer small weak currents, ambient interference can
affect them and give incorrect information to the control computer. It is therefore important that
care is taken when laying the cables. The low current cables must be kept well separated from the
high current cables. It is important that the low current cables are routed parallel to the high current
cables and are kept at a distance of at least 25 cm at lengths of up to 100 m, after that the distance
increases.
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