Carrier 69NT40-541-306, Operation And Service

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5–3 T-354
5.3.2 Fresh Air Position Sensor
The VPS allows the user to determine 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 5CMH (3CFM) or greater is
detected. It will scroll in intervals of 5CMH (3CFM). Scrolling to Function Code 45 will display the Fresh Air Vent
Position.
Data Recording of the Sensor 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 change greater than 5CMH (3CFM) and remains in that position for four minutes
NOTE
The user has four minutes to make necessary adjustments to the vent setting. This time 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 minutes stability period, an alarm will be gener-
ated. This provides the user with the ability to change the vent setting without generating multiple
events in the DataCorder.
5.4 CONNECT WATER-COOLED CONDENSER
The water-cooled condenser is used when cooling water is available and heating the surrounding air is objection-
able, such as in a ship's hold. If water-cooled operation is desired, connect in accordance with the following:
a. Connect the water supply line to the inlet side of con denser and the discharge line to the outlet side of
the condenser (see Figure 3.5 ).
b. Maintain a flow rate of 11 to 26 liters per minute (3 to 7 gallons per minute). The water pressure switch
will open to de-energize the condenser fan relay. The condenser fan motor will stop until the water pres-
sure switch closes.
NOTE
If controller configuration variable CNF48 is activated the condenser fan motor will activate if the HPS
opens twice in less than seven minutes. Power cycling the unit resets the counter.
c. To shift to air-cooled condenser operation, disconnect the water supply and the discharge line to the
water-cooled condenser.
The refrigeration unit will shift to air-cooled condenser operation when the water pressure switch closes or if the
controller configuration variable CNF48 is activated, the condenser fan motor will activate if the HPS opens twice in
less than seven minutes. Power cycling the unit resets the count.
5.5 CONNECT REMOTE MONITORING RECEPTACLE
If remote monitoring is required, connect remote monitor plug at unit receptacle (see item 9, Figure 3.6 ). When the
remote monitor plug is connected to the remote monitoring receptacle, the following remote circuits are energized:
CIRCUIT FUNCTION
Sockets B to A Energizes remote cool light
Sockets C to A Energizes remote defrost light
Sockets D to A Energizes remote in-range light