Alarm Problems - Danfoss DHP-H Installation And Service Instructions Manual

Auxiliary heater cuts in too soon
Cause
Collector too long.
Collector too short.
Sensor fault.
Incorrect output, insuf-
ficient brine.
Changed conditions
Auxiliary heater runs but not compressor
Cause
Sensor fault.
Final phase of peak heat-
ing production.
Alarm.
Operating mode ADD.
HEAT is selected.
Incorrectly set control
computer.
Built-in overheating pro-
tection (bi-metal protec-
tion) in the compressor
has tripped.
Incorrect phase sequence
Cause
Incoming phases are in
the incorrect order.
Pressure switch open = 0
Cause
Hot gas temperature too
high
Sensor fault >120 C
Insufficient filling volume
Overheating too high
15 .4 Alarm problems
BRINE LOW FLOW
Cause
Poor flow
Incorrectly connected
or incorrectly set flow
switch
Troubleshooting
1. Is the control computer correctly set (auto curve)
2. Integral value reached AH start
3. Max return temperature (high)
4. Alarm? Indicator RP = 0
5. HP produces peak heat
6. Dimensioning / Changed conditions
Incorrect phase sequence compressor
Troubleshooting
1. Is the control computer correctly set
2. Integral value reached AH start
3. Max return temperature (high)
4. Alarm? Indicator RP = 0
5. HP produces peak heat
6. Dimensioning / Changed conditions
Incorrect phase sequence compressor
Troubleshooting
• Check pressure pipe temperature.
• I t should be hot (not just warm) a little way from
the compressor.
• T here is a strange noise (loud, rattling) if the phas-
es are in the incorrect order so that the compres-
sor runs backwards.
Troubleshooting
Check sensor
Check over heating
Troubleshooting
Check flow:
- Is the ground water pump running?
- Check flow switch
- Calibrating flow switch
- System selection in the event of no ground water
-
-
If the phases are in the incor-
rect order, switch two incoming
phases at the main terminal
block.
Replace defective sensor.
VMBMA102
Remedy
Remedy
Remedy
Remedy
Remedy
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