1-11
1. Suction Service Valve
2. Discharge Service Valve
3. Air-Cooled Condenser
4. Water-Cooled Condenser or Receiver
5. Sight Glass
6. Water Outlet
7. Water Inlet
8. Pressure Relief Valve (High Side)
9. Pressure Relief Valve (Low Side)
10. Liquid Line Valve
11. Filter-Drier
12. Moisture-Liquid Indicator
13. Expansion Valve
14. External Equalizer Line
15. Expansion Valve Bulb
16. Evaporator
17. Suction Solenoid Valve
(69NT40)
18. Modulating Solenoid Valve
19. Quench Valve (Solenoid or Thermostatic)
18
2
16
8
7
1
3
4
10
5 6
9
11
13
14
15
17
19
12
Figure 1-5. Refrigeration Circuit
1.9 WATER-COOLED CONDENSER
(OPTIONAL)
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.
The water-cooled condenser is of the shell and coil
type with circulating water through the cupro-nickel coil.
The refrigerant vapor is admitted to the shell side and is
condensed on the outer surface of the coil.
1.9.1 Water-Cooled Condenser with
Water Pressure Switch
For operation of the refrigeration unit with the
water-cooled condenser, do the following:
a. Connect water supply line to inlet side of condenser
and discharge line to outlet side of condenser.
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 con-
denser fan motor will stop and will remain stopped until
the water pressure switch closes.
The refrigeration unit operating with the
water-cooled condenser will perform as outlined in
section 2.4 except that the condenser fan motor is
stopped in all modes.
To shift to air-cooled condenser operation, do the
following:
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. (Refer to section 1.3.)
1.9.2 Water-Cooled Condenser with
Condenser Fan Switch (CFS)
For operation of the refrigeration unit with the
water-cooled condenser with (CFS), do the following:
a. Connect water supply line to inlet side of condenser
and discharge line to outlet side of condenser.
b. Maintain a flow rate of 11 to 26 lpm (3 to 7 gpm).
c. Set CFS switch to position “O” when water is sup-
plied to water-cooled condenser. This will de-ener-
gize the condenser fan relay. The condenser fan mo-
tor will stop and will remain stopped until the CFS
switch is set to position “1”.
The refrigeration unit operating with the
water-cooled condenser and CFS switch in position “O” ,
will perform as outlined in section 2-4 except that the
condenser fan motor is stopped in all modes.
WARNING
When 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.
To shift to air-cooled condenser operation, do the
following:
Turn the unit off and set the CFS switch to position
“1”. Disconnect the water supply and the discharge line
to the water-cooled condenser. The unit should now
perform as outlined in section 2.4.
1.10 REMOTE MONITORING (OPTIONAL)
NOTE
Models with an in-range light, the light will be
illuminated if the container return air
temperature is within the tolerance selected.
Refer to section 1.13.4 (Code 29).
1.10.1 Remote Monitoring Plug
When the remote monitor is connected to the
remote monitoring plug, the following remote circuits
are energized.
Circuit
Function
Sockets RMT3 to RMR1
Energizes remote
in-range light
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