Fresh Air Position Sensor; Connect Water-Cooled Condenser; Water-Cooled Condenser With Water Pressure Switch; Water-Cooled Condenser With Condenser Fan Switch - Carrier 69NT40-541-001 Operation And Service

5.3.3

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 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.
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 5 CMH (3 CFM) and remains in that position for 4 minutes.
The user has 4 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 4 minutes. On com-
pletion of the first 4 minutes, the vent is required to remain in stable for the next 4 minutes. If vent posi-
tion changes are detected during the 4 minutes stability period, an alarm will be generated. 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 sub-
paragraphs.
5.4.1

Water-Cooled Condenser with Water Pressure Switch

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
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 and will remain stopped
until the water pressure switch closes.
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 pres-
sure switch closes.
5.4.2

Water-Cooled Condenser with Condenser Fan Switch

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
b. Maintain a flow rate of 11 to 26 lpm (3 to 7 gpm).
c. Set the condenser fan switch to position "O". This will de-energize the condenser fan relay. The condenser
fan motor will stop and remain stopped until the CFS switch is set to position "I.".
When condenser water flow is below 11 lpm (3 gpm) or when water-cooled operation is not in
use, the CFS switch MUST be set to position "1" or the unit will not operate properly.
d. To shift to air-cooled condenser operation, stop the unit, set the CFS switch to position "I" and restart the
unit. Disconnect the water lines to the water-cooled condenser.
T-316
NOTE
3.5.)
3.5.)
CAUTION
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5–4