2-10
(1) Set point temperature and control sensor
When the set point temperature (referred to as SP hereafter) is –10.1˚C(+13.8˚F) or lower, the
compressor is operated ON and OFF, in response to return air temperature.
(2) Control
qWhen the control temperature reaches SP (point A), the
compressor and condenser fan are turned off after the liquid
solenoid valve has been de-energized and the pump down
operation has been completed.
w
When the control temperature exceeds SP+1.0
˚
C, the compressor,
liquid solenoid valve and condenser fan are turned on.
However, the compressor runs for at least 2 minutes every
time once it is turned on. Even if the control temperature
becomes SP or lower (point C) within 2 minutes after the
compressor is turned on, the compressor, condenser fan
and liquid solenoid valve are not turned off. (2 minutes
compressor forced operation)
EV:Elec.Exp.Valve HSV:Hot Gas Solenoid Valve
LSV:Liquid Solenoid Valve ISV:Injection Solenoid Valve
DSV:Defrost Solenoid Valve BSV:Discharge gas Bypass Solenoid Valve
ESV:Economizer Solenoid Valve LPT:Low Pressure Transducer
DPR:Discharge pressure regulator HPT:High Pressure Transducer
SMV:Suction Modulation Valve HPS:High Pressure Switch.
FROZEN (Return air < 5˚C)
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