T -309
4-1
SECTION 4
OPERATION
4.1 INSPECTION (Before Starting)
WARNING
Beware of unannounced starting of the
evaporator and condenser fans. The u nit
may cycle the fans and compressor unex-
pectedly as control r equirements dictate.
a. Ifcontainer is empty, check inside for thefollowing:
1. Check channels or “T” bar floor for cleanliness.
Channels must be free of debris for proper air cir-
culation.
2. Checkcontainerpanels,insulationanddoorsealsfor
damage. Effect permanent or temporary repairs.
3. Visuallycheckevaporatorfanmotormountingbolts
for proper securement (refer to paragraph 6.17).
4. Checkfordirtorgreaseonevaporatorfanorfandeck
and clean if necessary.
5. Check evaporator coil for cleanliness or obstruc-
tions. Wash with fresh water.
6. Checkdefrostdrainpansanddrainlinesforobstruc-
tions and clear if necessary. Wash with fresh water.
7. Checkpanelsonrefrigerationunitforlooseboltsand
condition of panels. Make sure T.I.R. devices arein
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.
e. Check oil level in compressor sight glass.
4.2 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
Makesurethepowerplugsarecleananddry
befor e connecting to any power receptacle.
4.2.1 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
position “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 posi-
tion “I” (ON). Close and secure control box door.
4.3 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 whentransporting
frozen foods.
Air exchange depends on static pressure differential,
whichwillvarydependingonthecontainerandhowthe
container is loaded.
4.3.1 Upper Fresh Air Makeup Vent
Two slots and a stop are designed into the disc for air
flowadjustments.Thefirstslotallowsfora0to30%air
flow, and the second slot allows for a 30 to 100% air
flow. To adjust the percentage of air flow, loosen the
wingnutandrotatethediscuntilthedesiredpercentage
of air flow matches with the arrow. Tighten the wing
nut. To clearthegapbetweentheslots,loosen thewing
nut until the disc clears the stop. Figure 4-1 gives air
exchange values for an empty container. Highervalues
can be expected for a fully loaded container.
0
30
60
90
120
150
180
210
240
0 102030405060708090100
AIR
FLOW
(CMH)
1-!/2”
PERCENT OPEN
69NT FRESH AIR MAKEUP
T-BAR
2-%/8”
3”
T-BAR
T-BAR
ZERO EXTERNAL STATIC 50HZ
For 60HZ operation multiply curves by 1.2
Figure 4-1 Make Up Air Flow Chart
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