Daikin GYEQ20AN, Руководство по обслуживанию

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SiAUY361411EA Actuator Control
Control and Functionality 104
[Cooling main, heating main A]
• Keeps SH at the SC receiver outlet at a constant level.
• When the low-side pressure is lower than the low-side pressure set-point, keeps the low-side
pressure at a constant level.
[Heating, heating main B]
• Keeps SH at the SC receiver outlet at a constant level.
• These valves are normally controlled to the target of SH3 = 20°C so that refrigerant flows into
the waste heat recovery heat exchanger at an optimal flow rate.
• When the discharge temperature exceeds 100°C, these valves are controlled to the minimum
target of SH = 7°C.
„
EV5
[Cooling]
• When the engine is running at the minimum speed and yet the low-side pressure is lower than
the low-side pressure set-point, the waste heat recovery heat exchanger is used as an
evaporator. In this case, the opening degrees of these valves are adjusted to keep the low-
side pressure at a constant level.
[Cooling main, heating main A]
• When the low-side pressure is lower than the low-side pressure set-point, keeps the low-side
pressure at a constant level.
[Heating, heating main B]
• These valves are normally controlled to the target of SHS3 = 20°C so that refrigerant flows
into the waste heat recovery heat exchanger at an optimal flow rate.
• When the discharge temperature exceeds 100°C, these valves are controlled to the minimum
target of SHS5 = 7°C.
„
EV6
[All modes]
• Adjusts the compressor oil return temperature to the optimal value.
„
EV7
[Heating, heating main B]
• When the fluid pressure is higher than the fluid pressure set-point, adjusts the fluid pressure
by making the receiver gas flow to the low pressure side.
„
EV3A
[Cooling, cooling main, heating main A]
• If the high pressure cannot be maintained at the pressure set-point, synchronizes with SV3A
and 3B to maintain the high pressure.
„
EV3B
[Cooling main, heating main A, heating, heating main B]
• When the fluid pressure drops and reduced performance of the cooling indoor unit occurs,
maintains the receiver outlet pressure.
„
MV (water motor-operated valve)
[Cooling, cooling main, heating main A, heating, heating main B]
• Adjusts the evaporation amount by setting the refrigerant amount that flows into the waste
heat recovery heat exchanger to the optimal level.
„
SV1
[Cooling]
• This valve is closed (turned OFF).