Danfoss DHP-AX, Инструкция по установке и обслуживанию

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Service – 59 VMBMH302
Cause Troubleshooting Remedy
12. Changed conditions
Have you increased your heating
and/or hot water demand?
• If the heat pump has been dimensioned
for a certain demand and this demand is
increased, the heat pump might not be
able to maintain the desired room tem-
perature.
• If hot water consumption increases,
a larger proportion of time is used to
produce hot water, which means less
time for heat production (only applies to
VL-systems).
If the heat pump cannot cope with the
demand, replace it with one with a hig-
her output or supplement it with a hig-
her output auxiliary heater.
Problem – Too hot
Cause Troubleshooting Remedy
1. The heat pump’s control com-
puter is not set/adjusted to the
customer’s requirements/wishes. Check the ROOM and CURVE and MIN
settings. Adjust incorrect values in the heat
pump’s control computer.
ROOM = Desired indoor temperature.
CURVE = Should be set so that the
desired indoor temperature (ROOM) is
maintained regardless of the outdoor
temperature.
MIN = Lowest set-point value on the
supply line regardless of the outdoor
temperature.
2. Sensor fault, OUTDOOR/
ROOM/SUPPLY LINE. Check what the relevant sensor shows, is
it a plausible/actual value?
Measure the resistance of the sensor,
check against the ohm table in section
15.3 Measurement points .
If the sensor is defective, replace it.
3. Defective 3-way valve motor.
The motor should set the valve
to the relevant end position
depending on operating con-
ditions. If it does not, hot water
from the water heater will mix
with the radiator water. Check the function of the 3-way valve
motor by test running it manually. If
the motor does not shift mode during
manual test operation, check that there is
voltage to the motor, see wiring diagram. Is the motor being supplied with voltage
according to the wiring diagram in both
operating instances?
MANUAL TEST – REV.V. HOT WATER
0=Radiator mode, arm out from valve.
1=Hot water mode, arm positioned
towards the valve.
If there is voltage to the motor but the
arm does not shift mode, replace it.
4. Jammed 3-way valve insert.
If the insert is not sealed, hot
water from the water heater will
mix with the radiator water.
Detach the motor and test closing and
opening of the valve by pressing the
control arm. Take out and clean the jammed insert, or
replace with a new insert.