2-17
Component name
Pull-down
Capacity
Heat-up
Overcool
control
protection
Compressor
CC
ON
ON
ON
OFF
Evaporator fan. High speed
EFH
ON
ON
ON
ON
Evaporator fan. Low speed
EFL
OFF
OFF
OFF
OFF
Condenser fan
CF
ON / OFF
※
1
ON
ON / OFF
※
4
OFF
Liquid solenoid valve
LSV
ON
ON
OFF
OFF
Economizer solenoid valve
ESV
ON
OFF
OFF
OFF
Injection solenoid valve
ISV
ON / OFF
※
2 ON / OFF
※
5 ON / OFF
※
3
OFF
Hot-gas solenoid valve
HSV
OFF
ON / OFF
※
5
ON
OFF
Defrost solenoid valve
DSV
OFF
ON / OFF
※
5
ON
OFF
Discharge gas by-pass solenoid valve
BSV
OFF
ON / OFF
※
5
OFF
OFF
Reheat solenoid valve
RSV
OFF
OFF
OFF
OFF
Suction modulating valve
SMV
328pls (100%) 10~328pls (3~100%) 328pls (100%)
328pls (100%)
Electronic expansion valve
EV
21~420pls (5~100%) 48~420pls (11~100%)
0pls (0%)
189pls (45%)
2.5.2 Chilled operation
Control state transition and common control
START
SS
<
SP+1.5˚C
SS
≧
SP+1.5˚C
Overcool protection
Capacity control
Pull-down
Heat-up
SS : Control temperature (supply air sensor)
SP: Set point temperature
SS
<
SP+1.5˚C
RS
≧
SP+1.0˚C
Without dehumidification:
RS
≧
SP+1.0˚C
With dehumidification
RS
≧
SP+2.0˚C
SS
>
SP+5.0˚C
SS
≧
SP+1.0˚C
and 3-minutes
elapse
(SS
≦
SP–3.0˚C
and 3-minutes elapse)
or (
SS
≦
SP–0.5˚C
and 30-minutes elapse)
SS
≦
SP–0.5˚C
and 3-minutes elapse
Magnetic
contactor
Operation of magnetic contactor and solenoid valve
Note)
※
1: High pressure control (P.2-24)
※
4: Release control (P.2-26)
※
2: Injection control (P.2-25)
※
5: Capacity control and hot gas by-pass (P.2-26)
※
3: Charge control (P.2-26)
Solenoid
valve
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