Mitsubishi Electric LGH-250RVXT-E Handbook page 18

No. Problem
8 Even though the
remote controller is
operated to change
the ventilation mode,
the ventilation mode
is not changed.
9 The ventilation
mode cannot be
switched when
Lossnay is operat-
ing in the automatic
mode.
10 Air volume is too
small.
Factor
The outdoor temperature is 8°C
or lower.
The signal is input to the Bypass
mode switching input (CN26
12).
The pre-heater is ON, or within
one hour after the pre-heater is
turned OFF.
Temperature condition for Energy
recovery mode or Bypass mode is
not satisfied.
It has not passed 30 minutes since
the ventilation mode is switched.
The outdoor temperature is 8°C
or lower.
The signal is input to the Bypass
mode switching input (CN26
12).
The operation mode of the inter-
locked air conditioner (Mr. Slim in-
door unit or City Multi indoor unit)
is set to fan operation or heating.
The pre-heater is ON, or within
one hour after the pre-heater is
turned OFF.
Is the air filter clogged?
Pressure loss in the duct is too
high.
The model selection switch (SW6)
is not set correctly after the circuit
board is replaced.
The indoor negative pressure
setting or the indoor positive pres-
sure setting is set.
Power supply voltage is low.
In interlock with the air conditioner,
the outdoor air intake port of the
Lossnay unit is connected with the
air conditioner by using a duct.
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.)
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.
Check the temperature map.
For details, see the Lossnay technical manual.
Switching of the ventilation mode is controlled in
30 minutes cycle.
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.)
If the operation mode of the interlocked air
conditioner is fan operation or heating, the ven-
tilation mode of Lossnay is fixed to the Energy
recovery mode.
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.
Clean the air filter.
Set the supply/exhaust fan power up setting.
(See the Lossnay technical manual.)
Make the SW6 setting appropriate for the model.
( See chapter 7. (11) Setting status record (page
51).)
Check the function selection switches (SW2-
4 and 2-5) on the circuit board or the function
settings (No. 6 and 7) of PZ-61DR-E. (See the
Lossnay technical manual.)
Check the power supply voltage.
In this case, even if the Lossnay remote con-
troller is operated to start Lossnay while the air
conditioner is stopped, Lossnay will not supply
air.
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Corrective action