Holiday 2002 NEPTUNE, Owner'S Manual

Page: 276 / 344

Electrical Systems - Chassis
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2 0 0 2 N E P T U N E
9 • 276
Chemical Stability:
The air conditioning system life and efficient operations depends upon the
chemical stability of the refrigeration 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 refrigerant system be
chemically compatible. The only suitable compound for use with R134a is
PAG. The total amount of PAG within the refrigerant system is approximate-
ly 18% of the total refrigerant in the system.
How much refrigerant is in the system. How much should be used when
charging? You will need 1 oz. of PAG for each 7 feet of hose after the first 15
feet of hose. Roughly, a 40 foot motorhome will use 92 feet of refrigerant hose.
Take 15 feet off the measurement and the result would be 77 feet. This 77 feet
is then divided by 7 for total of 11. This represents the number of ounces of
PAG oil needed for the A/C system (11 oz.).
Carrying the formula one step further, the 11 oz. equal approximately 18%
of the entire system. The total will equate to approximately 61 oz. or 3.8 lbs. of
R-134a.
High pressure readings are another way to determine the amount of charge.
The ambient temperature reading is measured one inch away from the condenser.
The ambient temperature reading, plus 40°F, will equate to a value from the
pressure table.
PSIG - On fully charged system the expected pres-
sure that should be seen on the HIGH-SIDE gauge
will be around 200 PSIG.
NOTE: All systems are charged at
the factory with 4.0 lbs of R134A.
TEMPERATURE PSI GAUGE TEMPERATURE PSI GAUGE TEMPERATURE PSI GAUGE
16° F 15.69 60° F 57.47 112° F 151.30
18° F 17.04 65° F 64.10 114° F 156.10
20° F 18.43 70° F 71.19 116° F 161.10
22° F 19.73 75° F 78.75 118° F 166.10
24° F 21.35 80° F 86.80 120° F 171.30
26° F 22.88 85° F 95.40 122° F 176.60
28° F 24.47 90° F 104.40 124° F 182.00
30° F 26.10 91° F 106.30 126° F 187.50
32° F 27.79 92° F 108.20 128° F 193.10
34° F 29.52 93° F 110.20 130° F 198.90
36° F 31.32 94° F 112.10 135° F 213.70
38° F 33.17 95° F 114.10 140° F 229.40
40° F 35.07 100° F 124.30 145° F 245.80
42° F 37.03 102° F 128.50 150° F 263.00
44° F 39.05 104° F 132.90 155° F 281.00
45° F 40.09 106° F 137.30 160° F 300.10
50° F 45.48 108° F 141.90 165° F 320.00
55° F 51.27 110° F 146.50 170° F 340.80
Ambient Temperature*
90° F + 40° F = 130° F
Chart Conversion 130° F = 198.90 psi
* Ambient Temperature is measured 1 inch from the condensor.
EXAMPLE