Setting No. 0
Setting No. 1
This control is carried out regularly when the system is in cooling mode.
During stopped, fan mode setting or thermostat OFF condition at the indoor unit, MOV of the indoor unit is opened
regularly for 1 minute (at the interval of approximately 40 minutes).
During the thermostat ON, MOV of the indoor unit is opened 20 pulses from the current status.
* MOV pulse might be different from the table listed above depending on the use conditions.
8. 4-Way Valve Adjustment Control
2WAY VRF SYSTEM
Control Functions
The first operation after turning on power supply to outdoor unit.
The mode of the system changes.
The purpose of this control is to change over the 4-way valve appropriately with big pressure difference.
This control is performed at the following conditions.
Cooling operation
*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
The first operation after all outdoor units stopped for 60 minutes.
For 60 seconds
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
All outdoor units operate at the maximum capacity.
MOV at all indoor units operate at a fixed pulse according to the indoor unit
capacity.
All indoor units operate in Cooling mode (OFF status).
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed “LL”.
Minimum 1 min - Maximum 20 min or detected HPT ≥ 25°C and continue this condition
about 60 sec.
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
All outdoor units operate at the maximum capacity.
MOV at all indoor units initially operates 250 pulses and then runs in SC control mode.
All indoor units operate in heating mode (ON status).
Fan rotates at the set fan speed depending on the indoor unit operation mode or at
“LL” fan speed, or stops.
Heating operation
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