Payne PA1Z030 Installation, Start-Up And Service Instructions Manual page 12

B. Low Charge Cooling
Use Cooling Charging Charts, Fig. 15 20. Vary refrigerant
until the conditions of the appropriate chart are met. Note
that charging charts are different fl'om the type normally used.
Charts are based on charging the units to the correct super-
heat for the various operating conditions. Accurate pressure
gage and temperature sensing device are required.
To measure suction pressure, perform the following:
1. Connect the pressure gage to tile seYvice port on the suc
tion line.
2. Mount the temperature sensing device on the suction
line and insulate it so that outdoor ambient tempera
ttlre does not affect the reading. Indoor-air cfm must be
within the normal opei'ating range of the unit.
C. To Use Cooling Charging Charts
1. Take the outdoor ambient temperature and read the suc
tion presstlre gage.
2. Refer to appropriate chart to determine what the suc
tion temperature should be.
3. If suction temperature is high, add refi'igerant. If suc
tion temperature is low, carefidly recover some of the
charge.
4. Recheck the suction pressure as charge is adjusted.
EXAMPLE: (Fig. 15)
Outdoor Temperature ..................... 85 F
Suction Pressure ....................... 80 psig
Suction Temperature should be ............. 70 F
(Suction Temperature may vary _+5 ° F.)
If Chargemaster ¢>charging device is used, temperature and
pressure readings must be accomplished using the charging
chart.
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SUCTION LINE TEMPERATURE ('F)
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SUCTION LINE TEMPERATURE ('C)
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Fig. 15 -- Cooling Charging Chart -- PAIZ024
?58
621
414 _60
345 50
27E 40
30
30 40 50
80
70
810
90
SUCTION LINE TEMPERATURE ('E)
I I b I ] I t
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SUCTION LINE TEMPERATURE ('C)
Fig. 16 -- Cooling Charging Chart -- PAIZ030
758
589
_521
_552
483 _70 -
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345 50
276 40
30
30
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40 50 60 70
SUCTION LINE TEMPERATURE (*F)
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SUCTION LINE TEMPERAIURE ('el
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27 32
Fig. 17 -- Cooling Charging Chart -- PAIZ036
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