Fault Finding Instruction - Dantherm HCV 3 Installation And Service Manual

Fault finding instruction

For easier fault finding, use the remote control, on which all alarms are displayed. See
Alarms
the section "Functional description" in the user's guide on how to activate the different
operation modes. Localise the problem in the left column below and follow the instruc-
tions in the right column
Yellow light-emitting diode
(30/min) and a beep-sound
The unit still operates, however
the power consumption and
the noise levels are increased
due to high level of pressure
loss in the dirty filter.
Red, permanent light-emitting
diode and beep-sound.
The unit operates in fail-safe
mode, (Fail Safe Mode 1)
which is similar to nominal op-
eration but without access to
cooling function by means of
bypass.
Red, flashing light-emitting di-
ode (30/min) and beep-sound.
The unit operates in fail-safe
mode (Fail Safe Mode 2), dur-
ing which the supply fan oper-
ates only at lowest speed (Fan
Step 1) and the exhaust fan
operates at Fan Step1/ Fan
Step2.
Red, flashing light-emitting di-
ode (120/min) and beep-
sound.
The unit has stopped and the
bypass-damper is closed be-
cause this type of malfunction
can cause a safety risk.
Alarm
The filters need to be
checked/replaced.
T1 outside air sensor or
supply air sensor T2 is
defective.
Note that the bypass
damper is always closed,
when the unit is operating
in fail safe mode.
One of the following com-
ponents are defective or
has a bad connection:
• T3 extract air sensor
• T4 exhaust sensor
• The built in RH sensor
Or:
One of the two fans is not
able to reach the desired
speed.
One of the temperature
sensors has detected a
critically high temperature
above 70 °C.
T2 Supply air sensor has
measured a temperature
below 5 °C, at which there
is a risk of frost damages
on the reheating coil (ac-
cessory).
The ducts are not insu-
lated properly. Very low
outside temperatures < ÷
10°°C. The building is not
heated. The unit is not
balanced correctly.
Cause
Replace the filters and
reset the filter alarm on
the unit. See the sec-
tion "Preventive main-
tenance" on page 55.
Check and if necessary
replace the sensor set.
Check and if necessary
replace the sensor set.
Check that the fans are
able to rotate untram-
melled and that the ca-
ble has not lost the
connection.
Make sure that there is
no fire or other sources
of heat which might be
heating up the ducts to
a temperature above
70 °C.
Check the reason for
the low supply air tem-
perature and adjust it.
Re-insulate channels.
Install preheat. Carry
out correct regulation
of the unit.
Activate Installation
Mode by pressing
Manual + Auto for 6
seconds. See "How to
balance the unit" on
page 49
Action
Continued overleaf
63