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© 2012 Mobile Climate Control T-299 Rev. 08/2012
c. FREEZE-UP THERMOSTAT:
GEN 4 Series Freeze-Up Thermostat: Cut-o u t at 26°
F, ±1.5° F. Cut-in at 34° F, ±1.5° F. Pre-set a t
factory (Adjustable). Turn cou n terclockwise to end -
then 1/4 turn clockwise for original factory setting.
GEN 5 Series Freeze-Up Th ermo stat: Cut-out at
30.5° F, ±1.5° F. Cut-in at 45° F, ±1.5° F. Pre-set at
the factory (Non-adjustable).
d. RETURN AIR THERMOSTAT/SENSOR
Return Air Thermostat: Adjustable range from 55° F
to 85° F. Normal remote (drivers location) setting is
55° Fwitha±5° F differential.
Return Air Sensor (Total Control): Temperature
range 60° Fto80° F.
e. EVAPORATOR MOTORS
Gen 4 Series: Double shafted 12 VDC (13.5 VDC
Nominal), permanent magnet, motor/blower
assemblies.
Full Load Amp s: Refer to Table 3-1
Volts DC Maximum: 15.1 VDC
Volts DC Minimum: 10.8 VDC
RPM: 2600 @ zero static
Gen 5 Series: Single shafted 12 VDC continuous
duty motors.
Full Load Amps: 30 Amps @ 2900 RPM @ 12.5
VDC
Locked Rotor Am ps: 80 Amps
Volts DC Maximum: 16 VDC
Volts DC Minimum: 4 VDC
f. CONDENSER MOTORS
Rooftop:
CM-7 and CM-11: Single shafted 12 VDC (12.5
Nominal) continuous duty motors (barrel type) to
be used with Rooftop Condensers.
Full Load Amps: 30 Amps @ 2900 RPM @ 12.5
VDC
Locked Rotor Am ps: 80 Amps
Volts DC Maximum: 16 VDC
Volts DC Minimum: 4 VDC
KR-2 and KR-3: Fan-Motor Assembly. Single
shafted 12 VDC (12.5 Nominal) continuous duty
motors.
Full Load Amps: 7 Amps @ 2100 RPM @ 12.5
VDC
Locked Rotor Am ps: 40 Amps
Volts DC Maximum: 13.5 VDC
Volts DC Minimum: 5 VDC
KR-4: Single shafted, permanent magnet, 12 VDC
(12.5 Nominal) continuous duty, single speed
motors.
Full Load Amps: 7 Amps @ 1900 RPM @ 12.5
VDC
Locked Rotor Am ps: 30 Amps
Volts DC Maximum: 16 VDC
Volts DC Minimum: 4 VDC
Skirt Mounted: Permanent magnetic, single speed
motor (12VDC nominal) and fan combination
(pancake style) 5 blades.
Full Load Amps: 7 Amps @ 2100 RPM @ 12.5
VDC
Locked Rotor Amps: 40 Amps @ 13.5VDC
Volts DC Maximum: 13.5 VDC
Volts DC Minimum: 5 VDC
Skirt Mounted (”Vector” Fan): Permanent
magnetic, single speed motor (12VDC nominal)
and fan combination (pancake style) 10 blades.
Full Load Amps: 6.8 Amps @ 2350 RPM @ 12.5
VDC
Locked Rotor Amps: 25.4 Amps @ 13.5VDC
Volts DC Maximum: 13.5 VDC
Volts DC Minimum: 5 VDC
g. COMPRESSORS
Mobile Climate Control uses a variety of
compressors properly sized and suited for split
system applications. Their cubic inch
displacement (c.i.d.) ranges from a 10 cubic inch
TM-16 to the 19.1 cubic inch TM-31. Applications
include rear and front engine mounted.
Compressor Clutch coils typically draw 2 to 3
Amps. A compressor must always be replaced
with a compressor of the same style and capacity.
1.8 COOLING CYCLE
The unit operates as a vapor compression system
using R-134a as the refrigerant (see Figure 1-10 ).
The compressor raises the pressure and the
temperature of the refrigerant vapor and forces it
thru the discharge lines into the condenser tubes.
The co n den ser fan circulates surrounding air ( which
is at a temperature lower than the refrigerant) over
the outside of the condenser tubes. Heat transfer is
established from the refrigerant (inside the tubes) to
the condenser air (flowing over the tubes). The
condenser tubes have fins designed to improve the
transfer of heat from the refrigerant gas to the air;
this removal of heat causes the refrigerant to liquefy,
thus liquid refrigerant leaves the condenser and flows
to the filter-drier. The filter-drier contains an
absorbent that keeps the refrigerant clean and dry.
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