Danfoss DHP-A Service Instructions Manual page 62

Table 39. Problem – Connection of external AH
Cause
Incorrectly connected auxiliary heater.
Does not start when the control com-
puter gives the signal.
10.4.7 Outdoor section (Applies to DHP-A)
Table 40. Problem – Noise/loud noise
Cause
1. Positioning the outdoor unit.
2. Connection/wall lead-ins.
Table 41. Problem – Defrosting problems
Cause
1. Location/calibration of the outdoor
sensor.
2. Brine temperature in/out.
3. The defroster shunt does not regu-
late as it should.
Table 42. Problem – Build-up of ice under and around the outdoor unit
Cause
Insufficient drainage.
60 – Service instructions VMGFC302
Troubleshooting
Check the connection against the instruc-
tions/wiring diagram. Test the function in
manual mode.
Troubleshooting
Determine whether the outdoor unit can
be moved to a more suitable location.
Check that the unit is installed according
to the instructions.
Is the outdoor unit secured to the wall?
Troubleshooting
Check that the outdoor sensor is installed
according to the installation instructions
and that it is correctly calibrated.
Measurement check the temperatures
with a thermometer.
Manually test to check if the defroster
shunt opens and closes the flow over the
defroster tank. If the motor switches posi-
tion when testing, but defrosting still does
not function, remove the motor and try
closing and opening the valve by hand by
pressing in the control arm.
Troubleshooting
Does a lot of ice accumulate under and
around the outdoor unit because the mel-
ted water has nowhere to run?
Remedy
If the auxiliary heater is incorrectly con-
nected, reconnect according to the
instructions.
Remedy
When positioning the outdoor unit, its
direction does not affect its perform-
ance. The outdoor unit does not need to
be positioned as close to the heat pump
as necessary, 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
calibrate, if necessary. Alternatively, the
outdoor sensor can be located behind
the outdoor 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 com-
puter.
If the motor is defective, replace it. If the
insert jams, remove and clean/lubricate
it, or replace it.
Remedy
Drain the ground under and around the
outdoor section or install a drip tray with
a drainpipe routed to an indoor drain or
gully. NOTE! A heating cable may have
to be installed in the drainpipe.