Carrier PrimeLINE 69NT40-561-200, Operation And Service Manual

Page: 104 / 198

T-362 5–4
5.3.3 Vent Position Sensor
The vent position sensor (VPS) allows the user to determine the position of the fresh air vent via Cd45. 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 Cd45 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
during any of the following conditions:
• Trip start
• Every power cycle
• Midnight
• Manual changes greater than 5 CMH (3 CFM) remaining in the new position for at least four 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, AL50 will be
generated. This provides the user with the ability to change the vent setting without generating multi
-
ple 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
objectionable, such as in a ship’s hold. If water-cooled operation is desired, connect in accordance with the
following subparagraphs.
5.4.1 Water-Cooled Condenser with Water Pressure Switch
1. Connect the water supply line to the inlet side of the condenser and the discharge line to the outlet side of
the condenser (see Figure 3.6 , Figure 3.7 ).
2. 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.
3. To shift to air-cooled condenser operation, disconnect the water supply and the discharge line to the
watercooled condenser. The refrigeration unit will shift to air-cooled condenser operation when the water
pressure switch closes.
5.4.2 Water-Cooled Condenser with Condenser Fan Switch
1. Connect the water supply line to the inlet side of condenser and the discharge line to the outlet side of the
condenser (see Figure 3.6 , Figure 3.7 ).
2. Maintain a flow rate of 11 to 26 lpm (3 to 7 gpm).
3. 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.”
CAUTION
!
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.
4. 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