Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook page 40

Classification Portion
Transmission 1 Limitation of transmission line length followed? For
line example, 200m or less (total length : 500m) at the farthest.
2 1.25mm
(Remote controller 10m or less 0.75mm
3 2-core cable used for transmission line?
4 Transmission line apart from power source line by 5cm
or more?
5 One refrigerant system per transmission line?
6
The short circuit connector is changed form CN41 to CN40
on the MAIN board when the system is centralized control?
(Just one heat source unit. Not all heat source units.)
7
No connection trouble in transmission line?
System set Address setting properly done? (Remote controller,
1
indoor unit and heat source unit.)
Setting of address No. done when shutting off power
2
source?
Address numbers not duplicated?
3
Turned on SW3-8 on indoor unit circuit board when
4
mounting room thermistor sensor?
Before starting Refrigerant piping ball valve (Liquid pressure pipe, gas
1
pressure pipe) opened?
Turn on power source 12 hours before starting opera-
2
tions?
Check item
2 or more transmission line used?
–37–
Erroneous operation, error stop.
Erroneous operation, error stop.
2 )
Error stop in case multiple-core
cable is used.
Erroneous operation, error stop.
Not operate.
Not operate.
Error stop or not operate.
Error stop or not operate.
Can not be properly set with power
source turned on.
Not operate.
Set temperature not obtained at
heating operations (Thermostat
stop is difficult)
Error stop.
Error stop, compressor trouble.
Trouble