MCi Crusader II 1989 Maintenance Manual page 477

Date
1-1-89
Page
16-7
MC-9 MAINTENANCE MANUAL
Figure 16-5: Axial Fan and Motor
in Condenser Compt.
JLOWER MOTORS
All blower motors are 24 volt units of conventional design.
Defective motors may be repaired according to standard
procedures.
CAUTION:
Do not use emery cloth or sandpaper for seating
brushes or cleaning commutators. Motor
brushes shou Id be checked at regular intervals.
New brushes should be seated using a bedding
stone.
The blower motor for the central heat compartment is a
1
½
h.p. unit (1.1 KW). The motor for the axial fan is a 2 h.p.
unit (1.4 KW).
Figure 16-6: Sensing Unit installed at
Center Control Duct
TEMPERATURE
The temperature control is a rheostat unit which increases
the resistance in the thermostat sensing element, causing
cycling at higher or lower temperatures (68°-78°F;
20°-26°C).
This unit is installed at the driver's switch panel and pro-
vides a means of selecting a temperature range which is
then automatically maintained by the action of the thermos-
tat and water valves.
Wiring connections to the heating system thermostat are
shown in the wiring diagram included in Section 7 (Electri-
cal) of this manual.
Figure 16-7: C/H Motor and Related Components
A/C & HEATE;R SWITCH
The A/C-Heating switch is fed from blower cut-in relay
when generator is charging.
The selector switch in heat position "A" operates the
central heating coach t?lower at low speed; in A/C position
"8", it operates the following:
1) Coach blower operates at high speed.
2) Condenser motor is energized.
3) Compressor unloading solenoid and scavenge solenoid
are energized.
4) Condenser blower operates.
AIR CONDITIONING SYSTEM
The air conditioning system is designed to provide a
comfortable, healthful atmosphere within the coach. A
schematic diagram of the air-conditioning system is illus-
trated in figure 16-8.
A mixture of cooled, filtered, dehumidified fresh and
recirculated air is supplied through wall ducts located
below the side windows. The combination of outside and
recirculated air is continually filtered, resulting in a clean.
fresh atmosphere.