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(NOTE 1) Criteria for judging difference between suction and discharge temperature
1. Cooling
After operation for a minimum of 30 minutes in [COOL] mode, check the dry bulb temperature difference.
Temperature difference: 8°C or more between suction and discharge air of the indoor unit.
(In Max-Hz operation)
2. Heating
After operation for a minimum of 30 minutes in [HEAT] mode, check the dry bulb temperature difference.
Temperature difference: 15°C or more between suction and discharge air of the indoor unit.
(In Max-Hz operation)
∗ The temperature difference may diminish in cases of systems in which the connected indoor capacity
exceeds 100%, or with long pipe length, etc.
(NOTE 2) Criteria for operating current
For a test operation (with all the indoor units operating), normal operating current is shown in the
following table.
Outdoor unit
Current value
8HP 10HP 12HP
18 21 22
(Unit: A)
(NOTE 3) Criteria for cycle status
1. Refrigerating cycle under standard condition
The refrigerating cycle under standard cooling and heating condition is as follows:
∗ This compressor is driven with 4-pole motor. The value of the compressor frequency (Hz) measured by a clamp meter is
two times the rotation count (rps) of the compressor.
∗ This data is the cycle data under condition of standard pipe length and two 4-way Air Discharge Cassette type air
conditioners connected.
Data changes according to installed pipe length, combination of indoor units or connected indoor capacity.
∗ For a compressor, the left side is 1 and the right side is 2 viewed front the front of the unit.
Even if two compressors operate, the frequency difference may set as a measures against resonance.
∗ The temperature of indoor heat exchanger (TC) indicates TCJ sensor temperature in cooling time, and TC2 sensor
temperature in heating time respectively.
2. Criteria for operating pressure
General criteria is as follows:
Using the rotary switch on the outdoor unit I/F, the operating pressure, cycle temperature, and compressor rotation
count can be checked on the 7-segment display.
Refer to “Outdoor refrigerant circuit system data display” and “Indoor cycle data display” in Section 9. Troubleshooting.
Pressure (MPa)
Pipe surface temp (°C)
Number of compressor
(rps)
rotations
Air temp condition (DB/WB) (°C)
High (Pd)
Low (Ps)
Discharge (TD)
Suction (TS1)
Indoor heat exchanger (TC)
Outdoor heat exchanger (TE1)
Liquid temp (TL)
Compressor 1
Compressor 2
Indoor
Outdoor
10HP
MMY-MAP1002FT8
Cool standard Heat standard
3.1 2.9
0.8 0.7
86 90
63
846
43 1
36 36
79 75
79 75
27/19 20/–
35/– 7/6
All cooling operaton
All heating operation
High pressure : 2.0 to 3.2MPa
Low pressure : 0.5 to 0.9MPa
High pressure : 2.5 to 3.3MPa
Low pressure : 0.5 to 0.7MPa
Indoor :18 to 32°C
Outdoor :25 to 35°C
Indoor :15 to 25°C
Outdoor : 5 to 10°C
When all the units operate in cooling mode
When all the units operate in heating mode