Carrier 69NT40-561-019, Operation And Service Manual

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5–1 T-359
SECTION 5
OPERATION
5.1 INSPECTION (BEFORE LOADING)
WARNING
!
Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the
fans and compressor unexpectedly as control requirements dictate.
a. Check inside for the following:
1. Check channels or “T” bar floor for cleanliness. Channels must be free of debris for proper air circulation.
2. Check container panels, insulation and door seals for damage. Effect permanent or temporary repairs.
3. Visually check evaporator fan motor mounting bolts for proper securement (refer to Section 7.10 ).
4. Check for visible corrosion on the evaporator stator and fan deck (refer to Section 7.11 ).
5. Check for dirt or grease on evaporator fans or fan deck and clean if necessary.
6. Check evaporator coil for cleanliness or obstructions. Wash with fresh water.
7. Check defrost drain pans and drain lines for obstructions and clear if necessary. Wash with fresh water.
8. Check panels on refrigeration unit for loose bolts and condition of panels. Make sure TIR devices are in
place on access panels.
b. Check condenser coil for cleanliness. Wash with fresh water.
c. Open control box door. Check for loose electrical connections or hardware.
d. Check color of moisture-liquid indicator.
5.2 CONNECT POWER
WARNING
!
Do not attempt to remove power plug(s) be fore turning OFF start-stop switch (ST), unit circuit
breaker(s) and external power source.
WARNING
!
Make sure the power plugs are clean and dry before connecting to power receptacle.
5.2.1 Connection To 380/460 VAC Power
a. Make sure start-stop switch (ST, on control panel) and circuit breaker (CB-1, in the control box) are in posi-
tion “0” (OFF).
b. Plug the 460 VAC (yellow) cable into a de-energized 380/460 VAC, 3-phase power source. Energize the
power source. Place circuit breaker (CB-1) in position “I” (ON). Close and secure control box door.
5.3 ADJUST FRESH AIR MAKEUP VENT
The purpose of the fresh air makeup vent is to provide ventilation for commodities that require fresh air circulation.
The vent
must be closed when transporting frozen foods.
Air exchange depends on static pressure differential, which will vary depending on the container and how the con-
tainer is loaded.
Units may be equipped with a vent position sensor (VPS). The VPS determines the position of the fresh air vent
and sends data to the controller display.