2-2
T-294-01
b. Evaporator Section
The evaporator section (see Figure 2-2) contains the
return temperature sensor (RTS), hermetic thermostatic
expansion valve, dual-speed evaporator fan motors
(EM1 and EM2) and fans (2), evaporator coil and heater
(HR), drain pan heater (DPH), defrost heaters (DHBL,
DHBR, DHTK and DHTR), defrost termination sensor
(DTS), heat termination thermostat (HTT), interrogator
and USDA receptacles, and heat exchanger.
The evaporator fans circulate air throughout the
container by pulling air in the top of the refrigeration
unit, directing the air through the evaporator coil where
it is either heated or cooled, and discharging the air
through the bottom of the refrigeration unit into the
container.
When transporting perishable (chilled) commodities,
the fan motors will normally be in high speed above
--10
_
C (+14
_
F), or --5
_
C (+23
_
F) optionally.
The evaporator coil heaters are accessible by removing
the front lower access panel. The defrost termination
sensor is located on the coil center tube sheet and may
be serviced by removing the upper rear panel, or by
removing the left front upper access panel,
disconnecting the evaporator fan connector and
reaching through the access panel opening
.
WARNING
Before servicing unit, make sure the unit
circuit breakers (CB-1, and an optional
CB-2 -- if equipped), and the start-stop
switch (ST) are in the OFF position. Also
disconnect power plug and cable.
Downloaded from
