Danfoss DHP-A Service Instructions Manual page 15

Service instructions
Problem – Alarm Brine out
Cause
1. Defective sensor.
2. Brine temperature too low.
Problem – Alarm Brine flow low
Cause
1. Incorrect system selected in the
control system.
If the system does not contain a
flow sensor but the control system
is set for the system with flow sen-
sor, this alarm occurs.
2. Insufficient flow.
Problem – Alarm brine pump
Cause
The brine pump's integrated alarm
has deployed. (Only applies to
speed-controlled heat pumps.)
Danfoss Heating Solutions
Domestic heat pumps
Troubleshooting
Check what the sensor shows. Is it a plausible/
actual value?
Measure the resistance of the sensor, check against
the ohm table, see chapter Measurement points.
Check the set value on ALARM BRINE in the heat
pump's control computer.
Troubleshooting
In the menu SYSTEM, check which system is selec-
ted.
▪ Check whether the ground water pump is run-
ning.
▪ Check the flow sensor.
▪ Calibration/setting the flow sensor.
▪ Blocked exchanger?
Troubleshooting
▪ Air in the brine pump?
▪ Has the brine pump jammed?
Remedy
If the sensor is defective, replace it.
The alarm is triggered when the tempera-
ture on BRINE OUT is as low or lower than
the set value on ALARM BRINE. In the facto-
ry setting this function is inactive.
Remedy
If the incorrect system is selected, change
it.
The ground water pump must start and run
together with the heat pump's integrated
brine pump.
Check against the wiring diagram that the
flow switch is correctly connected.
Check that the flow switch is set for the cor-
rect working range according to the flow
switch instructions.
If the exchanger is blocked, clean or replace
it.
Remedy
Bleed the brine circuit according to the in-
stallation instructions.
If the brine pump has jammed, there is an
integrated shake function that attempts to
shake itself loose up to a maximum of 5
times, if it does not manage this, an alarm
will occur.
Try cutting the voltage to the heat pump to
stop the alarm and then manually run the
brine pump. If the alarm recurs, repeat the
procedure several times. If this does not
help, replace the brine pump.
VIGFI102
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