Lennox VEP034N432US, User Manual, Page: 37 / 44

DC Inverter Multi VRF System
33
No Debug item Parameter name Unit Reference
10
Fan motor’s operating
freq
Hz Changes in 0~49Hz according to system’s pressure.
11
IDU
parameters
IDU ambient temp °C ——
12
Indoor heat
exchanger’s inlet temp
°C
According to ambient temp, for a same IDU in cool
mode, the inlet temp will be 1°C~7°C lower than the
outlet temp, and 4~9°C higher than the low pressure
value.
For a same IDU in heat mode, the inlet temp will be
10°C~20°C lower than the outlet temp.
13
Indoor heat
exchanger’s inlet temp
°C
14
Opening angle of
indoor EXV
PLS
In cool mode, the opening angle of indoor EXV varies
within 70~480PLS.
In heat mode, the opening angle of indoor EXV varies
within 70~480PLS.
15
Communication
parameters
Communication data —
Number of IDUs detected by software is the same
with the actual number. No communication error.
16 Drainage system —— —
Indoor unit can drain water out completely and
smoothly. Condensate pipe has no backward slope of
water; Water of outdoor unit can be drained
completely through drainage pipe. No water drop
from unit base.
17 Others —— —
Compressor and indoor/outdoor fan motor do not
have strange noise. Unit can operate normally.
6 Common Malfunctions and Troubleshooting
WARNING:
①
If there is abnormal condition (e.g. unpleasant smell), turn unit off and disconnect power
immediately. Then contact LENNOX authorized service center. If unit continues operation
despite the abnormal condition, it may get damaged and lead to electric shock or fire hazard.
②
Do not repair the air conditioner by yourself. Improper maintenance may lead electric shock
or fire hazard. Please contact LENNOX authorized service center for maintenance.
(1) Please check the items below before calling for maintenance.
Problems Causes What to do
Unit doesn’t work.
Fuse or circuit breaker is cut off. Replace fuse or reset the circuit breaker.
Power failure. Restart unit when power is restored.
Power is not connected. Connect the power.
Remote controller’s power is not enough. Replace new battery.
Remote controller is out of the control
range.
Control range is within 8m.
Unit runs but stops
immediately.
Air inlet or air outlet of indoor and outdoor
units is blocked.
Clear obstructions.
Abnormal cooling or
heating.
Air inlet or air outlet of indoor and outdoor
units is blocked.
Clear obstructions.
Improper temp setting.
Adjust setting at remote controller or wired
controller.
Fan speed is set too low.
Adjust setting at remote controller or wired
controller.
Wind direction is not correct.
Adjust setting at remote controller or wired
controller.
Door or window is open. Close the door or window.
Direct sunshine. Draw curtain or louver.
Too many people in the room.