General Description; Condenser Assembly - Carrier 68G5-105 Series Operation & Service Manual

1.2 GENERAL DESCRIPTION

1.2.1 Condenser Assembly

The condenser assembly (See Figure 1-2) includes a
condenser coil, fan and motor assemblies, filter-drier,
sight glass, control box, liquid line solenoid valve(s),
king valves and an ambient temperature sensor.
The condenser coil provides a heat transfer surface for
condensing refrigerant gas at a high temperature and
pressure into a liquid at high temperature and pressure.
The condenser fans circulate ambient air across the
outside of the condenser tubes at a temperature lower
than refrigerant circulating inside the tubes; this results
in condensing the refrigerant into a liquid. The filter-drier
removes moisture and other noncondensibles from the
liquid refrigerant before it enters the thermal expansion
valves in the evaporator assemblies.
1 2 3 4
20 19 18 17 16
1. Condenser Coil Assembly
2. Fusible Plug
3. Liquid Line Outlet Fitting (Parcel Rack)
4. Liquid Line Outlet Fitting (Main)
5. Model/Serial No. Nameplate
6. Fan Guard
7. Filter-Drier
8. Venturi Ring
9. Condenser Fan Motor CM1
10. Fan Blade
11. Condenser Fan Motor CM2
12. Outside Temperature Sensor
T-312
5 6 7
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Figure 1-2. Condenser Assembly
The condenser is also fitted with a fusible plug which
protects the system from unsafe high temperatures.
The control box includes condenser fan relays no. 1 and
no. 2 (CFR1 and CFR2) to enable the main controller to
control operation of condenser fan motors no. 1 and no.
2 (CM1 and CM2). The control box also includes
condenser speed relay no. 1 (CSR1) which controls the
speed of both condenser fan motors CM1 and CM2. The
main evaporator liquid line solenoid valve and the parcel
rack liquid line solenoid valve (when so equipped)
closes when the system is shut down to prevent
refrigerant migration and to isolate the filter-drier for
servicing when the compressor is shut down. The king
valves enable servicing of the condenser assembly. The
ambient temperature sensor measures ambient
temperature and sends an electrical signal to the main
controller.
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13 Control Box--Contains: Condenser Fan
Relay No.1 (CFR1), Condenser Fan Relay
No. 2 (CFR2) and Condenser Speed Relay
No. 1 (CSR1)
14. Moisture & Liquid Indicator
15. Control Box Positive (+) Stud
16. Control Box Positive (+) Stud
17. Control Box Negative (--) Stud
18 Liquid Line (King) Valve
19. Discharge Shutoff King Valve
20. Refrigerant Inlet Fitting
1-2
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