Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 47

(5) Check points for system structure
In the case of the PUHY-(P) 400·500 YMF-C
Check points from installation work to test run.
Classification Portion
1
Instruction for selecting combination of outdoor unit, and
Installation
indoor unit followed? (Maximum number of indoor units
and piping
which can be connected, connecting model name, and
total capacity.)
2
Connecting piping size of branch piping correct?
3
Branch pipe properly selected?
4
Refrigerant piping diameter correct?
5
Refrigerant leak generated at connection?
6
Insulation work for piping properly done?
7
Specified amount of refrigerant replenished?
8
Pitch and insulation work for drain piping properly done?
Power source Specified switch capacity and wiring diameter of main
1
power source used?
wiring
2 Proper grounding work done on outdoor unit?
3
The phases of the L line (L1, L2, L3) correct?
4
L line and N line connected correct?
57
1 2 3 4
Check item
-44-
246
Trouble
Not operate.
Not cool (at cooling).
Not heat (at heating).
Not cool, not heat, error stop.
Condensation drip in piping.
Not cool, not heat, error stop.
Water leak, condensation drip in
drain piping.
Error stop, not operate.
Electric shock.
Error stop, not operate.
Some electric parts will be damaged.