Refrigeration Maintenance 10-17
5. If additional refrigerant must be added, close the gauge manifold hand valve. Then turn the unit (and remote evaporator)
On/Off switch(es) OFF.
6.
a. Leave the valve set for liquid charging.
b.Back seat the receiver outlet valveto the suction service valve.
c. Open the gauge manifold hand valve.
d.Start and operate the unit (and all remote evaporators) in high speed with the thermostat(s) set to cool.
e. Open the valve on the refrigerant supply bottle. Open the gauge manifold hand valve only enough to permit suction pressure
to increase approximately 1.70 bar, 25 psi. This will add liquid refrigerant slowly into the low side through the suction
service valve.
f. Add refrigerant until the correct charge is attained.
NOTE: If you are charging a partially charged unit, make sure the liquid level does not rise above the top of the receiver tank
sight glass (top of the bottom receiver tank sight glass on two sight glass receiver tanks).
NOTE: SLXe Spectrum units have a seperate charge level label as shown. Charge the unit to the figure written on the label
NOTE: For charging TCI and Spectrum units where the correct charge weight is not knowen, refer to the Charge Procedure
On page10-8 of this chapter.
7. When the correct amount of charge has been added, close the gauge manifold hand valve.
Unit Charging
1. Isolation valve closed
2. Vacuum valve closed
3. Evacuate or purge hoses before charging
4. Scale
5. Refrigerant
6. Valves to be in ‘cracked’ open position
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