Mitsubishi Electric LGH-F300RVX-E Handbook page 20

No. Problem
10 The ventilation
mode cannot be
switched when
Lossnay is operat-
ing in the automatic
mode.
11 Air volume is too
small.
Factor
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
46.4°F (8°C) or lower.
The signal is input to the
Bypass mode switching input
(CN26 [1] [2]).
The operation mode of the
interlocked air conditioner
(Mr. Slim indoor 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 pres-
sure setting or the indoor
positive pressure setting is
set.
Power supply voltage is low. Check the power supply voltage.
In interlock with the air condi-
tioner, the outdoor air intake
port of the Lossnay unit is
connected with the air condi-
tioner by using a duct.
Are the Filterboxes used?
Are the filters in the
Filterboxes clogged?
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 46.4°F (8°C) or
lower, the ventilation mode is fixed to the Energy
recovery mode.
Check the Bypass mode switching input (CN26 [1] [2]).
(See the Lossnay technical manual.)
If the operation mode of the interlocked air condition-
er is fan operation or heating, the ventilation 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 8. (8) Setting status record (page 48).)
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.)
In this case, even if the Lossnay remote controller is
operated to start Lossnay while the air conditioner is
stopped, Lossnay will not supply air.
To use the Filterboxes, set the function of Fan power
up individually for RA (return air) and OA (outdoor air
intake) sides.
Check the function selection switches (SW7-4 and
7-5) on the circuit board of the Lossnay unit or the
function settings (No. 64 and 65) of PZ-61DR-E.
Clean or replace the filters in the Filterboxes.
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Corrective action