111
(NOTE 1) Criterion for difference between suction and discharge temperature
1. Cooling
After operation for minimum 30 minutes with [COOL] mode, if there is 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 minimum 30 minutes with [HEAT] mode, if there is the dry bulb temperature difference
Temperature difference:15°C or more between suction and discharge air of the indoor unit.
(In Max-Hz operation)
∗ Consider that the temperature difference temperature difference may diminish in cases of system in which
the connected indoor capacity exceeds 100%, a long pipe length, a large difference.
(NOTE 2) Criterion for operating power current
For a test operation (All the indoor units operate), it is normal when the power current is under the
following values.
Outdoor unit
Current value
5HP 6HP 8HP 10HP 12HP
14 14 18 21 22
(Unit: A)
(NOTE 3) Criterion 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 of the rotation count (rps) of the compressor.
∗ This data is the cycle data under condition of the 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 from the front side.
Even if two compressors operate, the frequency difference may be a little set as 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. Criterion for operating pressure
General criterion 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 7-segment display.
Refer to “Outdoor refrigerant circuit system data display” and “Indoor cycle data display” in Section 9. Troubleshooting.
Cooling
Heating
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
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 5HP
MMY-MAP1001H MMY-MAP0501H
Cool standard Heat standard Cool standard Heat standard
3.1 2.9 2.8 2.5
0.8 0.7 0.9 0.7
86 90 84 78
63166
846943
43 1 41 3
36 36 44 34
79 75 46 49
79 75 46 49
27/19 20/– 27/19 20/–
35/– 7/6 35/– 7/6
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