Thermo King SB-III 30 SR+, Manual

Page: 34 / 120

Operating Instructions (Rev. 04/02)
24
3. COMPRESSOR OIL. The compressor oil level should
be visible in the sight glass.
4. REFRIGERANT. Check the refrigerant charge. See
Refrigerant Charge in the Refrigeration Maintenance
chapter.
5. PRE-COOLING. Make sure that the setpoint is at the
desired temperature and allow the unit to run for a min-
imum of 1/2 hour (longer if possible) before loading the
trailer.
This provides a good test of the refrigeration system
while removing residual heat and the moisture from the
trailer interior to prepare it for a refrigerated load.
6. DEFROST. When the unit has finished pre-cooling the
trailer interior, manually initiate a defrost cycle. This
will remove the frost that builds up while running the
unit to pre-cool the trailer.
To manually initiate a defrost cycle, press the SELECT
key until the dEF (defrost) prompt screen appears, then
press the ENTER key.
Refer to the appropriate Operation Manual or Opera-
tion and Diagnosis Manual for detailed information
about Manual Defrost.
The defrost cycle should end automatically.
NOTE: The unit will not defrost unless the evaporator
coil temperature is below 45 F (7 C).
Loading Procedure
1. Make sure the unit is OFF before opening the doors to
minimize frost accumulation on the evaporator coil and
heat gain in the trailer. (Unit may be running when
loading the trailer from a warehouse with door seals.)
2. Spot check and record load temperature while loading.
Especially note any off-temperature product.
3. Load the product so that there is adequate space for air
circulation completely around the load. DO NOT block
the evaporator inlet or outlet.
4. Products should be pre-cooled before loading. Thermo
King transport refrigeration units are designed to main-
tain loads at the temperature at which they were loaded.
Transport refrigeration units are not designed to pull
hot loads down to temperature.
Post Load Procedure
1. Make sure all the doors are closed and locked.
2. Start the unit if it was shut off to load (see Restarting
Unit).
3. Make sure the setpoint is at the desired setting.
4. One-half hour after loading, manually initiate a defrost
cycle. If the evaporator coil sensor temperature is
below 45 F (7 C), the unit will defrost. The micropro-
cessor will terminate defrost automatically when the
evaporator coil temperature reaches 57 F (13 C) or the
unit has been in the defrost mode for 30 or 45 minutes
(depending on setting).
Post Trip Checks
1. Wash the unit.
2. Check for leaks.
3. Check for loose or missing hardware.
4. Check for physical damage to the unit.