Danfoss DHP-A Service Instructions Manual page 32

Service instructions
2.4.7 Outdoor units
Problem – Noise/loud noise
Cause
1. Positioning the outdoor unit.
2. Connection/wall lead-ins.
Problem – Defrosting problems
Cause
1. Location/calibration of the out-
door sensor.
2. Brine temperature in/out.
3. The defroster shunt does not reg-
ulate as it should.
4. Defrost sensor calibration
Problem – Build-up of ice under and around the outdoor unit
Cause
Insufficient drainage.
Problem – Water run-off by the outdoor unit, risk of moisture problems in house foundations
Cause
Insufficient drainage.
32
Domestic heat pumps
Troubleshooting
Determine whether the outdoor unit can be
moved to a more suitable location.
Check that the unit is installed according to the in-
structions. Is the outdoor unit secured to the wall?
Troubleshooting
Check that the outdoor sensor is installed accord-
ing to the installation instructions and that it is cor-
rectly calibrated.
Measurement check the temperatures with a ther-
mometer.
Manually test to check if the defroster shunt opens
and closes the flow over the defroster tank. If the
motor switches position when testing, but defrost-
ing still does not function, remove the motor and
try closing and opening the valve by hand by
pressing in the control arm.
Check that the defrost sensor is installed according
to the installation instructions and that it is correct-
ly calibrated.
Troubleshooting
Does a lot of ice accumulate under and around the
outdoor unit because the melted water has no-
where to run?
Troubleshooting
During some periods when the outdoor unit is be-
ing defrosted, large amounts (20-40 L/day) of water
can run off.
VIGFI102
Remedy
When positioning the outdoor unit, its di-
rection does not affect its performance. The
outdoor unit does not need to be posi-
tioned as close to the heat pump as neces-
sary, it can be positioned as far as 30 "pipe
metres" away.
Rigid mountings can generate noise from
the outdoor section via walls in the house.
Remedy
Install according to the instructions and cal-
ibrate, if necessary. Alternatively, the out-
door sensor can be located behind the out-
door unit 20 cm out from the rear side of
the outdoor unit.
If necessary, calibrate BRINE IN and BRINE
OUT in the heat pump's control computer.
If the motor is defective, replace it. If the in-
sert jams, remove and clean/lubricate it, or
replace it.
Calibrate if necessary.
Remedy
Drain the ground under and around the
outdoor section or install a drip tray with a
drainpipe routed to an indoor drain or gul-
ly. NOTE! A heating cable may have to be
installed in the drainpipe.
Remedy
Drain the ground under and around the
outdoor unit so that it can cope with the
extra amount of water produced because
of defrosting or install a drip tray with a
drainpipe routed to an indoor drain or gul-
ly. NOTE! A heating cable may have to be
installed in the drainpipe.
Danfoss Heating Solutions