Multi Zone Service Manual - General

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Only for training and service purposes
Part 3 Control logic
8.2 Starting control
1) Only 1 LEV will be operate as below and others are closed fully.
2) Starting control does not use the time when the system operate with partial load after (example) after finishing starting
control for 1 indoor unit, another indoor unit is ON additionally is operated with target opening of LEV.
3) The indoor units which are in the middle of starting control are continuing starting control with the opening of its
opening.
4) Urgent control by indoor piping temperature
1. LEV open 4 pulse with every 10 sec when the indoor piping temperature is below 2˚C
2. When the temperature reaches 4˚C, system return to the starting control pulse value.
Target step
Time(sec)
Target Pulse
Time (Option)
Pull open
Starting LEV
opening
Comp starting