Operating Instructions (Rev 6/98)
19
inspect the restriction indicator periodically to assure
the air filter is not restricted. Service the air filter when
the yellow diaphragm indicates 22 in. of water column.
Press the button on the top of the restriction indicator
after servicing the air filter.
7.
REMOTE INDICATOR LIGHTS (Optional). The
remote indicator lights, if used, show the operating
modes and the alarm light. The remote indicator is nor-
mally mounted on the front roadside corner of the
trailer so it is visible through the driver’s roadside mir-
ror.
8.
DATA INTERFACE. The Data Interface is a serial port
that can be used to connect the microprocessor to a
Mini IBM
®
PC compatible computer or a Hewlett
Packard HP 100LX
®
(or higher) shirt pocket computer.
9.
COMPOUND PRESSURE GAUGE (Optional). The
compound pressure gauge indicates the pressure in the
suction line at the compressor.
NOTE: When the return air temperature is near set-
point and the modulation valve (optional) is ener-
gized, the suction pressure will be lower than normal.
NOTE: The suction pressure is lower with low ambi-
ent temperatures and low compressor discharge pres-
sures.
When the unit is on COOL, the compound gauge will
read approximately 165 kPa (24 psi) when the trailer
temperature is above -12.2° C (10° F). When the unit is
heating or defrosting, the suction pressure will climb
and also stabilize at 165 kPa (24 psi).
When the unit is on COOL with a -18° C (0° F) return
air temperature, the suction pressure should be 90-124
kPa (13-18 psi).
When the return air temperature is below -18° C (0° F),
the suction pressure should be 34-90 kPa (5-13 psi).
UNIT PROTECTION DEVICES
1.
FUSIBLE LINK (Current Limiter). The fusible link is
located electrically between the 2 wire and the battery.
At a current draw of approximately 50 to 55 amps, the
fusible link will melt, cutting all power to the unit.
2.
FUSES. A number of fuses, located on the relay board,
protect various circuits and components.
A 40 amp fuse (F9—#2 Circuit) protects the 2AA cir-
cuit, which is the main power circuit.
A 15 amp fuse (F3—Damper) protects the 29F circuit,
which supplies power to the damper solenoid.
A 15 amp fuse (F18—High Speed Solenoid) protects
the 7D circuit, which supplies power to the high speed
solenoid.
A 15 amp fuse (F21—#8 Circuit) protects the 8F cir-
cuit, which supplies power to various control relays and
components.
A number of three amp fuses protect microprocessor
circuits, control relay circuits, remote light circuits
(optional) and various components.
3.
HIGH PRESSURE CUTOUT. The high pressure cutout
is a pressure sensitive switch that is located in the com-
pressor discharge manifold. If the discharge pressure
rises above 3103 kPa (450 psi), the switch opens the 8D
circuit to the fuel solenoid, which stops the engine.
4.
HIGH PRESSURE RELIEF VALVE. The high pres-
sure relief valve is designed to relieve excess pressure
within the refrigeration system. The valve is a spring-
loaded piston that lifts off its seat when refrigerant
pressure exceeds 3447 kPa (500 psi). The valve will
reseat when the pressure drops to 2758 kPa (400 psi).
The valve could possibly leak refrigerant after it has
relieved excess pressure. Tapping the valve lightly may
help the valve reseat and SEAL PROPERLY. The valve
is non-repairable and requires no adjustment. If the
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