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[5-2 Outdoor Unit Control ]
(3) Outdoor unit heat exchanger capacity control patterns
Model
(E)P200, (E)P250,
(E)P300, (E)P350,
P400 models
EP400, (E)P450,
(E)P500 models
(4) Control of the outdoor unit fan during refrigerant balance control operation
To correct the deviation of refrigerant among the combination of units, the fan rotation speeds are controlled in accordance
with the difference of TdSH between the OC and OS. The outdoor unit fan speed for each unit is increased or decreased dur-
ing liquid equalization control, and the unit with the lower TdSH is operated with a fan rotation speed that is faster than that of
the unit with the higher TdSH.
The maximum fan rotation speed of the unit during liquid refrigerant equalization control is approximately 20 percent greater
than that of the unit not operated in the liquid refrigerant equalization control mode.
TdSH=TH4-Tc
5-2-11
Evaporation Temperature Control (Expansion Valves <LEV5a and LEV5b>)
The LEV is controlled every 30 seconds to maintain constant the bypass inlet temperature (TH15) of the BC controller during
heatingmain mode or heating mode.
The LEV operates at 300 pulse while the compressor is stopped. The LEV opens to a specified position in response to chang-
es in heat exchanger capacity control patterns during cooling only or cooling main mode.
5-2-12
Control at Initial Startup
When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.
At the completion of the initial operation mode on the OC and OS, they will go into the normal control mode.
(1) Single-outdoor-unit system
HWE1314A
Operation
Operation mode
patterns
Cooling-only
1
Cooling-main
2
3
Heating-only
1
Heating-main
1
2
Defrost
1
Cooling-only
1
Cooling-main
2
3
4
5
Heating-only
1
Heating-main
1
2
Defrost
1
Initial startup mode starts.
50
F
60Hz
Completed in the integrated operation time of 35 minutes.
or
F < 50Hz
Completed in the integrated operation time of 90 minutes.
or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute .
Initial startup mode complete
Solenoid valve
SV4a
SV4b
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
- 144 -
SV4c
SV4d
-
ON
-
OFF
-
OFF
-
OFF
-
ON
-
OFF
-
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
ON
OFF
ON
OFF
GB
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