Fault Finding Instruction - Dantherm HCH 5 Installations- Und Serviceanleitung

Fault finding instruction

Alarms For easier fault finding, use the remote control, on which all alarms are displayed. See
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 operation but
without access to cooling function
by means of bypass.
Red, flashing light-emitting diode
(30/min) and beep-sound.
The unit operates in fail-safe
mode (Fail Safe Mode 2), during
which the supply fan operates
only at lowest speed (Fan Step 1)
and the exhaust fan operates at
Fan Step1/ Fan Step2.
Red, flashing light-emitting diode
(120/min) and beep-sound.
The unit has stopped and the by-
pass-damper is closed because
this type of malfunction can
cause a safety risk.
24
Alarm
The filters need to be
checked/replaced.
T1 outside air sensor or
supply air sensor T2 is de-
fective.
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 sen-
sors has detected a critically
high temperature above
70 °C.
T2 Supply air sensor has
measured a temperature be-
low 5 °C, at which there is a
risk of frost damages on the
reheating coil (accessory).
The ducts are not insulated
properly. Very low outside
temperatures < ÷ 10°°C. The
building is not heated. The
unit is not balanced cor-
rectly.
Cause
Replace the filters and
reset the filter alarm on
the unit. See the section
"Preventive maintenance"
on page 18
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 cable
has not lost the connec-
tion.
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 tempera-
ture and adjust it. Re-in-
sulate 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 12
Action
Continued overleaf