Service manual

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 / OFF※4 ON / OFF※1 OFF
Liquid solenoid valve LSV ON ON OFF OFF
Economizer solenoid valve ESV OFF OFF OFF OFF
Injection solenoid valve ISV ON / OFF※2 ON / OFF※4 ON / OFF※3 OFF
Hot-gas solenoid valve HSV OFF ON / OFF※4 ON OFF
Defrost solenoid valve DSV OFF ON / OFF※4 ON OFF
Discharge gas by-pass solenoid valve BSV OFF ON / OFF※4 OFF OFF
Suction, modulating valve SMV 100% 3 to 100% 100% 100%
Electronic expansion valve EV 10 to 100% 10 to 100% 0% 50%
2-11
2.5.2 Chilled and partial frozen mode
Control state transition and common control
START
TS<SP+1.5˚CTS≧SP+1.5˚C
Overcool protection
Capacity control
Pull-down
Heat-up
TS : Control temperature (supply air sensor or return air sensor)
SP: Set point temperature
TS≦SP+1.5˚C RS≧SP+1.0˚C
TS≧SP+5.0˚C
TS≧SP+1.0˚C
and 3-minutes
elapse
(TS≦SP–3.0˚C
and 3-minutes elapse)
or (
TS≦SP–0.5˚C
and 30-minutes elapse)
TS≦SP–0.5˚C and 3-minutes elapse
Magnetic
contactor
Operation of magnetic conductor and solenoid valve
Note) ※1: High pressure control ※2: Discharge gas temperature control
※3: Charge control ※4: Capacity control and hot gas by-pass
Solenoid valve