Mitsubishi Lossnay LGH-150RVXT-E Handbook page 25

No. Problem
2 Even though the
remote controller is
operated to change
the ventilation
mode, the ventila-
tion mode is not
changed.
3 The Night-purge
operation cannot be
stopped with PZ-
61DR-E.
4 Even though the
Night-purge is set,
Lossnay does not
perform the Night-
purge operation.
5 The Night-purge
operation stops in
halfway through.
6 Abnormal noise
comes from the
damper motor
Factor
The outdoor temperature is 8°C
or lower.
The signal is input to the Bypass
mode switching input (CN26
12).
The Lossnay unit is performing
the Night-purge operation.
The pre-heater is ON, or within
one hour after the pre-heater is
turned OFF.
Usual start/stop button operation
cannot stop the Night-purge op-
eration.
Conditions of the Night-purge are
not satisfied.
The Night-purge schedule is not
set.
The operating condition became
outside the Night-purge condi-
tions.
The Lossnay remote controller or
the system controller was oper-
ated to start or stop the operation
of the Lossnay unit.
A controller other than PZ-61DR-E
or a controller that is not support-
ing Night-purge is operated to
change the ventilation mode.
Mis-assembling of the damper
motor
Damper motor failure
When the outdoor temperature is 8°C or lower,
the ventilation mode is fixed to the Energy re-
covery mode.
Check the Bypass mode switching input (CN26
1 2). (See the Lossnay technical manual.)
The ventilation mode cannot be changed during
the Night-purge operation. (See the Lossnay
technical manual.)
When the pre-heater is ON, or for one hour after
the pre-heater is turned OFF, the ventilation
mode is fixed to the Energy recovery mode.
Press the start/stop button once to display the
operation screen, and then press the start/stop
button again.
When the Night-purge conditions such as the
indoor/outdoor temperature are not satisfied,
Lossnay does not perform the Night-purge
operation.
For details, see the Lossnay technical manual.
Check the setting of PZ-61DR-E or the system
controller that supports Night-purge operation.
For details, see the Lossnay technical manual.
When the operating condition becomes outside
the Night-purge conditions, the Night-purge
operation ends.
For details, see the Lossnay technical manual.
When the start or stop operation is performed
during the Night-purge operation, the Night-
purge operation ends.
When a controller other than those supporting
Night-purge is operated to change the ventila-
tion mode, the system performs the normal
ventilating operation. (See the Lossnay techni-
cal manual.)
Remove the GM assembly from the main unit, and
then remove the damper motor from the damper mo-
tor casing to check the pulley position. If the position
is incorrect, adjust it as shown in the picture below,
and then reassemble the GM assembly.
If no error is found around the pulley and wire, re-
place the GM assembly.
─ 25 ─
Corrective action
Damper motor Pulley