Problem – Irregular indoor temperature
Cause Troubleshooting Remedy
1. The heat pump’s control
computer is not set/adjus-
ted to the customer’s re-
quirements/wishes.
Check the ROOM and CURVE, MIN, MAX CURVE5, CURVE0,
CURVE-5 and HEAT STOP 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
(on the condition that heat stop does not
apply).
MAX = Highest set-point value on the sup-
ply line regardless of the outdoor tempera-
ture.
CURVE5,0,-5 =The supply temperature can
be adjusted up or down 5°C at these out-
door temperatures.
HEAT STOP = Stops all production of heat
when the outdoor temperature is the same
as or greater than the set value. To exit heat
stop the outdoor temperature must drop to
3°C below the set value.
2. Incorrectly positioned/
installed sensors.
Check that outdoor sensors and any room sensors are in-
stalled according to the instructions and that they are cali-
brated.
▪
Check that the room sensor is posi-
tioned in a suitable place that is repre-
sentative of the building and calibrate
it if necessary. Avoid placing near ex-
ternal doors, windows and heat sour-
ces.
▪
Install the outdoor sensor according to
the instructions and calibrate it, if nec-
essary.
Service Instructions DHP-AQ
Danfoss Heating Solutions VMGFJ202
27
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