McQuay MWM Service Manual page 61

MCQUAY Service Guide Book
Single Split Inverter – Y Outdoor Unit
Model
M5LCY 10/15 DR
M5LCY 20/25 CR
M5LCY 30/40/50/60 FR
Error code diagnosis by Outdoor 7-segment Display
In the Y-series model, the 7-segment display section on the outdoor unit indicates the following:
1. Unit running parameters
2. Error codes
Unit Condition
Unit in normal 1. Flashes the compressor running frequency for up to 30 minutes after first start-up/
operating tact switch is pressed.
mode 2. Subsequently, press on the tact switch to return to the above display.
3. Flashes up to 11 running parameters when tact switch is pressed in the sequence
corresponding to the parameter number (refer to Unit Running Parameter Table).
Unit is in fault 1. Flashes unit error code (similar to wireless handset)
2. Flashes up to 11 running parameters when tact switch is pressed in the sequence
corresponding to the parameter number (refer to Unit Running Parameter Table).
1. Unit Running Parameters:
Parameter
Number
00 Compressor actual rotation
01 Compressor target rotation
02 Dc bus voltage
03 Total current (x10)
04 Outdoor air temperature
05 Outdoor heat exchanger temperature
06 Compressor discharge temperature
07 Outdoor heat sink temperature
08 Indoor air temperature
09 Indoor heat exchanger temperature
10 EXV Opening
2. Error Codes (HAP: Microcomputer in operation; H3P: Error Detection):
LED INDICATION
HAP H3P
Green Red
●
○ -
● -
○
HAP: Microcomputer in normal operation
H3P: Error Detection
Blinks
●
Off
○
On
Board
S_2_03A
S_2_04A
-
Parameter Description
Normal
Faulty Outdoor Unit PCB Board
Power Supply Abnormality or Faulty Outdoor PCB Board
Activation of Protection Device
Display on 7-segment
Description
60
Diagnosis
Unit/ Range
r/s
r/s
VDC
A
°C
°C
°C
°C
°C
°C
Pulse