Heating Comfort Problems - Danfoss DHP-H Installation And Service Instructions Manual

MOTOR PROTECTION
Cause
Cable break
Phase drop
Uneven load between
the phases.
Defective soft start
Defective contactor
Defective or incorrectly
set motor protection
Defective compressor
Blown fuses
15 .5 Heating comfort problems
Indoor temperature too high
Cause
3-way valve fault.
Sensor fault outdoor,
room, supply pipe.
Adjusting - trimming
Too low indoor temperature
Cause
Adjusting - trimming
3-way valve only to hot
water
Operating conditions
curve
Operating mode
Circulation pumps
Radiator thermostats /
valves
Sensor outdoor / room /
supply pipe
Dirty capacitor
Dirt in filter ball
Lack of refrigerant
Radiators too small
Heat pump too small
Incorrectly adjusted
expansion valve
Changed conditions
Max stage permitted
2
Troubleshooting
1. Check fuses
2. Check phase drop (network supplier)
3. Uneven load electrical net
1. C heck supply to contactor / motor protection /
soft start before and after contactor / motor pro-
tection.
4. Setting motor protection
5. C heck power consumption compressors / imped-
ance winding
Troubleshooting
Check the function of the 3-way valve by test running it
manually.
Measure the resistance at the sensors and check against
the table in the installation instructions.
Check the room set point and heat curve settings.
Troubleshooting
Is the heat pump running? (Current supply fuse)
Room set point / curve setting too low
Check sensor (outdoor, F1, room)
3-way valve (to hw)
Flow:
- Are the circulation pumps running?
- closed heating system valves
- too few/too small radiators
- strainers/condenser etc
Operating mode (only HP) (VL / D-system). Check opera-
tion of external auxiliary heater.
Changed conditions (modified etc.)
Check which power stage(s) can be used.
Replace defective motor or
insert.
Replace defective sensor.
Adjust incorrect values in the
heat pump's control computer.
Check the 3-way valve, motor
and insert, replace defective/
jammed.
Adjust the settings.
If they are incorrect, replace.
The circulation pumps may
have jammed, if so, open the
bleed screw and try to release
the paddle wheel using a
screwdriver for example.
If an external auxiliary heater is
used, check that it is correctly
installed by test running it in
manual mode.
If incorrectly set, adjust in the
heat pump's control computer.
VMBMA102
Remedy
Remedy
Remedy