20A-120A-1TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
approved approved agencyagency..
Compressor.Compressor. The compressor is belt driven andThe compressor is belt driven and
circulates the refrigerant through the air condition-circulates the refrigerant through the air condition-
ing system ing system when its clutwhen its clutch is engaged. ch is engaged. It receivesIt receives
a cool, low pressure gas and pumps a hot, higha cool, low pressure gas and pumps a hot, high
pressure gas to pressure gas to the condenserthe condenser. . When the When the thermo-thermo-
stat signals for cooling, an electrical signal is sentstat signals for cooling, an electrical signal is sent
to the compressor clutch, engaging the clutch andto the compressor clutch, engaging the clutch and
driving the compressor.driving the compressor.
NOTE:NOTE: Any time repairs Any time repairs are made to are made to the air con-the air con-
ditioning system which require the recovery of theditioning system which require the recovery of the
refrigerant, it is refrigerant, it is recommended that the drier recommended that the drier bebe
changed and 4 ounces (118 milliliters) of AC esterchanged and 4 ounces (118 milliliters) of AC ester
lubricating oil be lubricating oil be added to the added to the dryer.dryer.
Condenser.Condenser. The condenserThe condenser, mounted , mounted on theon the
back of the cab, changes the refrigerant from aback of the cab, changes the refrigerant from a
hot, high pressure gas (from the compressor) to ahot, high pressure gas (from the compressor) to a
warm, high pressure liquid (to the drier) by coolingwarm, high pressure liquid (to the drier) by cooling
the refrigerant. the refrigerant. The condenser The condenser is powered is powered byby
12 VDC12 VDCfrom afrom a30 amp circuit breaker (CB24).30 amp circuit breaker (CB24).
Drier.Drier. The drier stores The drier stores a volume of a volume of refrigerant.refrigerant.
Additionally, it filters and removes moisture fromAdditionally, it filters and removes moisture from
the refrigerant. the refrigerant. The drier receivThe drier receives a warm, es a warm, highhigh
pressure liquid (from the condenser) and sends apressure liquid (from the condenser) and sends a
sure gas. sure gas. The cold, The cold, low pressure low pressure gas is sent gas is sent backback
into the expansinto the expansion valve. ion valve. The temperature The temperature of thisof this
low pressure gas is what controls the expansionlow pressure gas is what controls the expansion
valve. valve. The colder the gas, The colder the gas, the closer a the closer a ball willball will
seat and restrict the refrigerant into the evaporatorseat and restrict the refrigerant into the evaporator
coil.coil.
The heater coil is the medium by which heat isThe heater coil is the medium by which heat is
transferred from the engine coolant to the opera-transferred from the engine coolant to the opera-
tor’s compartment. tor’s compartment. A heater shutA heater shut-off -off valve isvalve is
located on the air conditioner / heater unit andlocated on the air conditioner / heater unit and
when opened, allows the heat transfer to occur.when opened, allows the heat transfer to occur.
When operating the air conditioner, close theWhen operating the air conditioner, close the
heater shut-off valve for maximum coolingheater shut-off valve for maximum cooling
efficiency.efficiency.
Circuit Breakers.Circuit Breakers. Refer Refer toto Circuit BreakersCircuit Breakersinin
thethe Component TroubleshootingComponent Troubleshootingofof Section 6Section 6
for troubleshooting of circuit breakers.for troubleshooting of circuit breakers.
Air Conditioner / Heater Maintenance.Air Conditioner / Heater Maintenance. TheThe
remote mounted condenser of the air conditioningremote mounted condenser of the air conditioning
system should be cleaned every 3 months tosystem should be cleaned every 3 months to
remove debris. remove debris. The condenser The condenser can be can be cleanedcleaned
with a fin comb, air hose and nozzle, or soap andwith a fin comb, air hose and nozzle, or soap and
water. water. The evaporator / heatThe evaporator / heater coils in the er coils in the air con-air con-
ditioner / heater unit should be cleaned everyditioner / heater unit should be cleaned every
3 months with compressed air.3 months with compressed air.
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