Electrical Systems - Chassis
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DIPLOMAT
9•253
Condenser - The condenser in front of the radiator is made of coils and
fins which provide rapid transfer of heat from the refrigerant as external air pass-
es over the coils. The high pressure gas is changed to a high pressure liquid.
Condenser Fan - A steady flow of cooling air is maintained across the
condenser during system operations. The fan is part of the hydraulic system.
Receiver-Drier - Freon leaves the condenser, enters the dehydrator and is
stored until needed. The drier filters out moisture in the system. It only takes one
drop of moisture to cause a malfunction in the cooling unit.
Expansion Valve - The expansion valve suppresses the refrigerant into the
evaporator according to the cooling requirements. The pressure is reduced in the
restrictive effort of the expansion valve. A part of the valve is the capillary tube
assembly. The capillary tube is the sensing bulb at the outlet of the evaporator.
Evaporator - A tube core and fins are used in the evaporator similar to the
condenser. Air is blown through the fins to allow the evaporator to cool and
reduce the pressure.
Blower and Motor - Just as the condenser has a fan, the evaporator has a
fan called the blower. The blower will draw air from the cab area and force the
air over the evaporator coils and fins. This forced air will ensure continuous
vaporizing of the R134a.
Relays and Switches - Both elec-
tronic and vacuum switches are used in
the control and operations of the sys-
tem.
Chemical Stability:
The air conditioning system life
and efficient operations depends upon
the chemical stability of the refrigera-
tion system. The refrigeration system is
made of Refrigerant-R134a and
Polyakylene Gycol (PAG) synthetic
lubricant. It is very important that all
materials contained within the refriger-
ant system be chemically compatible.
The only suitable compound for use
with R134a is PAG. The total amount
of PAG within the refrigerant system is
approximately 18% of the total refriger-
ant in the system.
TEMP F/ PSIG
16 15.69
18 17.04
20 18.43
22 19.73
24 21.35
26 22.88
28 24.47
30 26.10
32 27.79
34 29.52
36 31.32
38 33.17
40 35.07
42 37.03
44 39.05
45 40.09
50 45.48
55 51.27
TEMP F/ PSIG
60 57.47
65 64.10
70 71.19
75 78.75
80 86.80
85 95.40
90 104.40
91 106.30
92 108.20
93 110.20
94 112.10
95 114.10
100 124.30
102 128.50
104 132.90
106 137.30
108 141.90
110 146.50
TEMP F/ PSIG
112 151.30
114 156.10
116 161.10
118 166.10
120 171.30
122 176.60
124 182.00
126 187.50
128 193.10
130 198.90
135 213.70
140 229.40
145 245.80
150 263.00
155 281.00
160 300.10
165 320.00
170 340.80
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