Evaporator Unit - Carrier CAPRI-280 Operation And Service Manual

1.2.2 Evaporator Unit

The evaporator unit includes roadside and curbside
evaporator coils.
Each evaporator unit includes six fan and motor
assemblies, evaporator/heater coil assemblies, thermal
expansion valves, condensate drain connection(s), and
evaporator heat valve.
The evaporator coils provide a heat transfer surface for
transferring heat from air circulating over the outside
surface of the coil to refrigerant circulating inside the
tubes; thus providing cooling when required. The heating
1. Evaporator Coil, Roadside
1a. Evaporator Coil, Curbside
2. Expansion Valve
3. Evaporator Blower and Motor
3a. Allen Screw
4. Humidity Sight Glass
5. Return Air Filter
6. Liquid Line
7. Relay Board
8. Logic Board
coils provide a heat transfer surface for transferring heat
from engine coolant water circulating inside the tubes to
air circulating over the outside surface of the tubes, thus
providing heating when required. The fans circulate the
air over the coils. The air filters filter dirt particles from
the air before the air passes over the coils. The thermal
expansion valves meter the flow of refrigerant entering
the evaporator coils. The heat valve controls the flow of
engine coolant water supplied to the heating coils upon
receipt of a signal from the controller. The condensate
drain connections provide a means for connecting tubing
for disposing of condensate collected on the evaporator
coils during cooling operation.
Figure 1-3. Evaporator Unit
1-3
9. Suction Line
10. Discharge Line
11. Heating Line
12. Evaporator Motor Harness
13. Lid Screw --- Stopper
14. Locking Screw Gasket
15. Lid Bolt Support
16. Square Nut
17. Lid Locking Screw
T-283