Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 19

No. Problem
10 Even though the
remote controller is
operated to change
the ventilation mode,
the ventilation mode
is not changed.
11 The ventilation
mode cannot be
switched when
Lossnay is operat-
ing in the automatic
mode.
12 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 [1] [2]).
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.
Temperature condition for
Heat 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 [1] [2]).
The operation mode of the
interlocked air conditioner (Mr.
Slim indoor unit or City Multi
indoor unit) is set to fan opera-
tion 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
pressure setting is set.
Power supply voltage is low.
In interlock with the air condi-
tioner, the outdoor air intake
port of the Lossnay unit is con-
nected with the air conditioner
by using a duct.
Airflow setting is performed
with PZ-62DR-E.
When the outdoor temperature is 8°C or lower, the
ventilation mode is fixed to the Heat recovery mode.
Check the Bypass mode switching input (CN26
[1] [2]). (See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
When PZ-62DR-E is used, The ventilation mode
cannot be changed during the Night-purge opera-
tion. (See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
When the pre-heater is ON, or for one hour after
the pre-heater is turned OFF, the ventilation mode
is fixed to the Heat recovery mode.
Check the temperature map.
For details, see the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.
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 Heat recovery mode.
Check the Bypass mode switching input (CN26
[1] [2]). (See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
If the operation mode of the interlocked air condi-
tioner is fan operation or heating, the ventilation
mode of Lossnay is fixed to the Heat 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 Heat recovery mode.
Clean the air filter.
Set the supply/exhaust fan power up setting.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
Make the SW6 setting appropriate for the model.
( See Chapter 7. (9) Setting status record (page
47).)
Check the function selection switches (SW2-4 and
SW2-5) on the circuit board or the function settings
(No. 6 and 7) of PZ-62DR-E.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
Check the power supply voltage.
In this case, even if the Lossnay remote controller
is operated to start Lossnay while the air condi-
tioner is stopped, Lossnay will not supply air.
Check the "Airflow" screen or the function settings
(No. 73 to 78, 87, and 88) of PZ-62DR-E.
(See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)
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Corrective action