Carrier 69NT40-561-300, Operation And Service Manual

Page: 99 / 174

5–1 T-365
SECTION 5
OPERATION
5.1 INSPECTION (B
EFORE
L
OADING
)
WARNING
!
Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the
fans and compressor unexpectedly as control requirements dictate.
1. Check inside for the following:
a. Check channels or “T” bar floor for cleanliness. Channels must be free of debris for proper air circulation.
b. Check container panels, insulation and door seals for damage. Effect permanent or temporary repairs.
c. Visually check evaporator fan motor mounting bolts for proper securement (refer to Section 7.14 ).
d. Check for visible corrosion on the evaporator stator and fan deck (refer to Section 7.15 ).
e. Check for dirt or grease on evaporator fans or fan deck and clean if necessary.
f. Check evaporator coil for cleanliness or obstructions. Wash with fresh water (refer to Section 7.15 ).
g. Check defrost drain pans and drain lines for obstructions and clear if necessary. Wash with fresh water.
h. Check panels on refrigeration unit for loose bolts and condition of panels. Make sure T.I.R. devices are in
place on access panels.
2. Check condenser coil for cleanliness. Wash with fresh water (refer to Section 7.10 ).
3. Open control box door. Check for loose electrical connections or hardware.
4. Check color of moisture − liquid indicator.
5.2 CONNECT POWER
WARNING
!
Do not attempt to remove power plug(s) before 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
1. Make sure start − stop switch (ST on control panel) and circuit breaker (CB − 1 in the control box) are in posi-
tion “0” (OFF).
2. 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.
5.2.2 Connection To 190/230 VAC Power
An autotransformer ( Figure 5.1 ) is required to allow operation on nominal 230 volt power. It is fitted with a 230 VAC
cable and a receptacle to accept the standard 460 VAC power plug. The 230 volt cable is black in color while the
460 volt cable is yellow. The transformer may also be equipped with a circuit breaker (CB
− 2). The transformer is a
step up transformer that will provide 380/460 VAC, 3 − phase, 50/60 Hz power to the unit when the 230 VAC power
cable is connected to a 190/230 VAC, 3 − phase power source.