Way Valve Adjustment Control - Panasonic U-4LE2E5 Service Manual & Test Run Service Manual

7. 4-Way Valve Adjustment Control

8. 4-Way Valve Adjustment Control

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.
The first operation after turning on power supply to outdoor unit.
The first operation after all outdoor units stopped for 60 minutes.
The mode of the system changes.
Cooling operation
Control time
Outdoor units
MOV
Indoor units RAP valve kit
Fan
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
Heating operation
Control time
Outdoor units
MOV
RAP valve kit
Fan
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
For 60 seconds
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.
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.
Control Functions - Outdoor unit
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2WAY VRF SYSTEM
Mini VRF SYSTEM
Control Functions
1