Mitsubishi Electric Lossnay VL-220CZGV-EB Handbook page 24

(4) Failure mode 4: Lossnay does not work properly.
Initial Check Items
If Lossnay does not work properly after installation is completed, check the following items.
No. Check item
1 Are the function selection switches
(SW2 and SW5) on the Lossnay
circuit board set correctly to suit the
required application?
2 When PZ-61DR-E is used, are the
function selections set correctly to
suit the required application?
3 When PZ-61DR-E is used, are icons
and characters displayed on the PZ-
61DR-E screen?
4 Is the external input used?
Individual check items
If Lossnay does not work after installation is completed, check the following items.
No. Problem
1 Actual fan speed
of the Lossnay unit
differs from the fan
speed set with the
remote controller.
2 Even though the
remote controller is
operated to change
the ventilation
mode, the ventila-
tion mode is not
changed.
Depending on the settings of the function selection switches,
Lossnay may automatically operate or stop, or specific operation
may be unable to be performed with the remote controller.
Depending on the settings of the function selections, Lossnay may
automatically operate or stop, or specific operation may be unable
to be performed with the remote controller.
Based on the icon and characters, you can check statuses such
as the timer operation and protective operation.
(See the Lossnay installation manual or remote controller manual.)
If the interlock mode is set to the "External input priority ON/OFF
interlock" and if the external device is operating, the stop operation
by PZ-61DR-E is prohibited. (See the Lossnay technical manual.)
If the Remote/Local switching (CN32) is set to remote, the start/
stop operation by the Lossnay remote controller is prohibited.
(See the Lossnay technical manual.)
Priority is given to the operation by the fan speed switching in-
put (CN17) and Bypass mode switching input (CN26, only when
P-133DUE-E is installed).
(See the Lossnay technical manual.)
Factor
The signal is input to the fan
speed input (CN17).
The signal is input to the fan speed
switching input (CN26 45).
Function setting (No. 8) of PZ-
61DR-E "Max. fan speed setting
during the first 30 minutes" is
enabled.
The indoor negative pressure
setting or the indoor positive pres-
sure setting is set.
The system is operating in the
protective mode (intermittent
operation).
The outdoor temperature is 8°C
or lower.
The signal is input to the Bypass
mode switching input (CN26
12).
Check the fan speed input (CN17).
(See the Lossnay technical manual.)
Check the fan speed switching input (CN26
45). (See the Lossnay technical manual.)
Lossnay operates at fan speed 4 for 30 minutes
when operation starts.
(See the Lossnay technical manual.)
Check the function selection switches (SW2-4
and 2-5) on the circuit board or the function set-
tings (No. 6 and 7) of PZ-61DR-E.
(See the Lossnay installation manual.)
When PZ-61DR-E is used, it displays the icon
" " that indicates the protective operation is
in-progress.
For details, see the remote controller manual.
When the outdoor temperature is 8°C or lower,
the ventilation mode is fixed to the Heat recov-
ery mode.
Check the Bypass mode switching input (CN26
12). (See the Lossnay technical manual.)
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Notes
Corrective action