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104 SCXG-SVX01B-EN
Do not exceed 200 psig when
leak testing the system. Damage
to the unit could result, or an
explosion may occur causing
injury or death.
In the event of required system repair,
leak test the liquid line, evaporator coil,
and suction line at pressures dictated by
local codes, using the following
guidelines.
1. Charge enough refrigerant and dry
weight. Use an accurate scale or
charging cylinder to determine the
exact weight of the refrigerant entering
the system. Failure to use either a scale
or a charging cylinder can lead to
undercharging or overcharging
resulting in unreliable operation.
Owner Maintenance
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WARNING
!
Do not apply flame to the
refrigerant container to increase
refrigerant pressure. Uncontrolled
heat may cause excessive drum
pressures and explosions,
resulting in injury or death and
equipment damage.
Do not allow liquid refrigerant to
come into contact with the skin.
If it does, treat the injury as if the
skin had been frostbitten or
frozen. Slowly warm the affected
area with lukewarm water and
seek medical attention
immediately.
To charge the system, complete the
following procedure:
1. Charge liquid refrigerant into the liquid
line service valve of each compressor
circuit. The vacuum will draw some of
the required refrigerant into the
system. See Figure O-M-7 on page 105.
2. Complete the charging process by
charging gaseous refrigerant into the
suction line shrader valve with the unit
running. However, make sure that
some refrigerant is present in each
circuit before starting the compressors.
The refrigerant container should be
upright so that gaseous refrigerant is
drawn off the top.
Note: Charge each circuit with R22. See
Tables O-M-1 and O-M-2.
Do not allow liquid refrigerant to
enter the suction line. Excessive
liquid will damage the
compressor.
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WARNING
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CAUTION
!
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CAUTION
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Table O-M-1. Water-Cooled Unit (SXWG) Refrigerant Charge.
Unit Size Circuit A Circuit B
Charge lbs. (kg) Charge lbs. (kg)
SXWG 20 25 (11.3) 25 (11.3)
SXWG 29
SXWG 30 27 (12.2) 25 (11.3)
SXWG 35 27 (12.2) 27 (12.2)
Table O-M-2. Air-Cooled Unit (SXRG) Refrigerant Charge
Unit Size Circuit 1 Circuit 2 Circuit 1 Circuit 2
Charge lbs. (kg) Charge lbs. (kg)
SXRG 20 B-10 T A-10 T 36 36
SXRG 25, 32 B-10 T A- 15 T 36 58