Carrier 69NT40-561-019, Руководство по эксплуатации и обслуживанию

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T-359 5–2
5.3.1 Upper Fresh Air Makeup Vent
Two slots and a stop are designed into the Upper Fresh Air disc for air flow adjustments. The first slot allows for a 0
to 30% air flow; the second slot allows for a 30 to 100% air flow. To adjust the percentage of air flow, loosen the
wing nut and rotate the disc until the desired percentage of air flow matches with the arrow. Tighten the wing nut.
To clear the gap between the slots, loosen the wing nut until the disc clears the stop.
Figure 5.1 gives air exchange values for an empty container. Higher values can be expected for a fully loaded con-
tainer.
Figure 5.1 Upper Fresh Air Make Up Flow Chart
5.3.2 Vent Position Sensor
The VPS allows the user to determine the position of the fresh air vent via Function Code 45. This function code is
accessible via the Code Select key.
The vent position will display for 30 seconds whenever motion corresponding to 5 CMH (3 CFM) or greater is
detected. It will scroll in intervals of 5 CMH (3 CFM). Scrolling to Function Code 45 will display the Fresh Air Vent
Position.
The position of the vent will be recorded in the DataCORDER whenever the unit is running under AC power and
any of the following:
• Trip start
• On every power cycle
• Midnight
• Manual changes greater than 5 CMH (3 CFM)
• Remaining in the new position for at least 4 minutes
NOTE
The user has four minutes to make necessary adjustments to the vent setting. This time calculation
begins on the initial movement of the sensor. The vent can be moved to any position within the four
minutes. On completion of the first four minutes, the vent is required to remain stable for the next four
minutes. If vent position changes are detected during the four-minute stability period, an alarm will be
generated. This provides the user with the ability to change the vent setting without generating multi-
ple events in the DataCORDER.
0
50
100
150
200
250
0 10 20 30 40 50 60 70 80 90 100
TBAR
1 1/2”
TBAR
2 5/8”
TBAR 3”
AIR
FLOW
(CMH)
50HZ
PERCENT OPEN
0
50
100
150
200
250
300
0 10 20 30 40 50 60 70 80 90 100
TBAR
1 1/2”
TBAR
2 5/8”
TBAR 3”
AIR
FLOW
(CMH)
60HZ
PERCENT OPEN