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CONTROL
② Outdoor heat exchanger liquid flow control valve
Outdoor heat exchanger liquid flow control valve controls the degree of superheat at the outlet of the outdoor
heat exchanger.
1. Outdoor heat exchanger liquid flow control valve open position range
In cooling : Fixed at 0 steps (without control)
In heating : 60 ~ 500 steps
2. Initial open position
In cooling : 0 steps
In heating : Lower limit by apparent engine speed
3. Control during normal operation
<Heating>
This control works so that the degree of superheat at the outlet of the outdoor heat exchanger meets the stan-
dard value.
However, this control sets the lower limit of open position by apparent engine speed to maintain the lowest
open position suitable for the amount of circulating refrigerant.
③
Sub heat exchanger liquid flow control valve
The sub heat exchanger liquid flow control valve is used for control of degree of superheat at the sub heat
exchanger outlet, compressor intake temperature control (in heating only), freezing prevention control
(in cooling only) and abnormal engine coolant temperature avoidance control (in cooling only).
1. Sub heat exchanger liquid flow control valve open position range
In cooling : 0 ~ 500 steps
In heating : 0 ~ 500 steps
2. Initial open position
In cooling : 0 steps
In heating : Lower limit by apparent engine speed
3. Control during normal operation
<Cooling>
This control sets the upper limit of open position so that the degree of superheat at the sub heat exchanger
is not too small. This control also sets the lower limit of open position so that the indoor heat exchanger liquid
temperature is not too low, and the engine coolant temperature is not too high.
<Heating>
This control works so that the degree of superheat at the outlet of the sub heat exchanger meets the standard
value.
However, this control sets the lower limit of open position by apparent engine speed to maintain the lowest
open position suitable for the amount of circulating refrigerant.
④
Hot gas bypass valve control
This control works mainly for freezing prevention, high pressure avoidance, and cold start.
1. Antifreeze control (in cooling only)
To prevent freezing of the indoor heat exchanger, this control switches between ON and OFF depending on
indoor heat exchanger temperature.
2. Refrigerant high pressure avoidance control
To prevent too high refrigerant pressure, this control switches between ON and OFF depending on refrigerant
high pressure.
3. Cold start control
To raise engine coolant temperature quickly for assuring evaporation heat source at the start by the remote
controller, this control switches between ON and OFF depending of refrigerant low pressure and engine cool-
ant temperature.
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