Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 48

5
8
•
1 2
Classification Portion
¡
Transmission Limitation of transmission line length followed? For
line example, 200m or less (total length : 500m) at the farthest.
™
1.25mm
(Remote controller 10m or less 0.75mm
£
2-core cable used for transmission line?
¢
Transmission line apart from power source line by 5cm or more?
∞
One refrigerant system per transmission line?
§
The short circuit connector is changed form CN41 to
CN40 on the MAIN board when the system is centralized
control? (Just one outdoor unit. Not all outdoor units.)
¶
• No connection trouble in transmission line?
•
Connection of wrong remote controller line terminals?
• MA Remote controller : TB15
• M-NET Remote controller : TB5
System set Address setting properly done? (M-NET Remote
1
controller, indoor unit, BC controller and outdoor 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?
2
Turn on power source 12 hours before starting operations?
3
3
Check item
2
or more transmission line used?
•
2
)
1
*
-45-
4
3
Trouble
Erroneous operation, error stop.
Erroneous operation, error stop.
Error stop in case multiple-core
cable is used.
Erroneous operation, error stop.
Not operate.
Not operate.
Error stop or not operate.
Never finish the initial mode.
Error stop or not operate.
(*1 case of R2 / WR2 / BIGR2 series)
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.