Mitsubishi Electric VL-250CZPVU-L-ERT Handbook page 35

No. Symptom
5 CO concentration is
2
not displayed on the
controller.
6 Indoor, outdoor, and/or
supply air temperature
indication is shown as
"LO" or "HI".
[2] Interlocking with air conditioner (Mr. Slim) or external devices
No. Symptom
1 Interlock settings
cannot be per-
formed with the
controller.
2 Interlocking
operation is not
performed.
Cause
With the function setting No.
84, CO concentration indica-
2
tion setting is set to "0: Hide".
The By-pass ventilation
operation is being performed,
or exhaust air fan is being
stopped.
The detected CO
tion is outside the measure-
ment range.
The indoor and/or outdoor
air temperature is outside the
measurement range.
Cause
The power of the Lossnay unit is not ON. Refer to section [1] of "Failure mode 1".
Faulty connection of the controller cable Refer to section [2] of "Failure mode 1".
The power of the Lossnay unit is not ON. Refer to section [1] of "Failure mode 1".
Faulty connection of the controller cable
or external input signal cables
The terminal block connected and the
type of external signal do not match
(charged or volt-free).
The unit is set to the delay operation.
Automatic supply air stop/Automatic
supply air intermittent operation is being
performed.
Set the function setting No. 84 to "1: Show".
(Refer to the function No. 84 in "8. (2) Function
setting list (page 26)" for details.)
Since CO
correctly in the operation status shown in the left,
CO concentration is not displayed.
2
concentra- Density lower than 400 ppm is shown as "Lo"
2
and density equal to or higher than 2000 ppm is
shown as "2000".
• Outdoor air temperature:
Temperature lower than 2°C is shown as "LO"
and temperature higher than 36 °C is shown as
"HI".
• Indoor and supply air temperature:
Temperature lower than 9°C is shown as "LO"
and temperature higher than 37 °C is shown as
"HI".
Refer to section [2] of "Failure mode 1".
Check the type of external signal and the
connections of the external control input
terminal.
LED1 (green) on the circuit board lights.
It starts operation in 30 or 15 minutes after
starting operation by the air conditioner or
external signal.
Check the function setting No. 9 value of
the controller. (Refer to the function No. 9 in
"8. (2) Function setting list (page 24)" for
details.)
The icon "
protective mode is displayed.
Refer to "Display" in Chapter 5 of the
Instruction Manual.
─ 35 ─
Corrective action
concentration cannot be measured
2
Corrective action
" indicating operation in the