Danfoss DHP-AX Installation And Service Instructions Manual page 67

15.4.7 Outdoor unit
Problem – Noise/loud noise
Cause
1. Positioning the outdoor unit.
2. Connection/wall lead-ins.
Problem – Defrosting problems
Cause
1. Location/calibration of the
outdoor sensor.
2. Brine temperature in/out.
3. The defroster shunt does not
regulate as it should.
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.
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 position when
testing, but defrosting still does not fun-
ction, remove the motor and try closing
and opening the valve by hand by pres-
sing in the control arm.
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 being defrosted, large amounts
(20-40 L/day) of water can run off.
VMBMH302
Remedy
When positioning the outdoor unit, its
direction does not affect its performance.
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" way.
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 compu-
ter.
If the motor is defective, replace it.
If the insert jams, remove and clean/lub-
ricate 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 hea-
ting 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 gully. NOTE! A hea-
ting cable may have to be installed in the
drainpipe.
Service – 67