Trane CCRC 20, Installation, Operation And Maintenance Manual

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28 CXRC-SVX01J-EN
Refrigerant Charging
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IIm mp po orrtta an ntt:: For proper system operation, use only
refrigerant type listed on unit nameplate.
Once the system is properly installed, leak tested, and
evacuated, refrigerant charging can begin. Charge
refrigerant into the system by weight. Approximate
operating refrigerant charge capacities for 20 through
60-ton CCRC/CIRC condensing units are given in and .
Calculate additional charge required for any other units
and additional piping to determine the total system
charge.
Use an accurate scale or charging cylinder to
determine the exact charge entering the system.
Failure to charge the system accurately can lead to
under or overcharging and result in unreliable
operation.
Liquid Line Charging
Large amounts of refrigerant should be added through
the liquid line service valves. If system is being
recharged after evacuating and dehydrating, determine
the approximate weight of charge required and charge
to that level. If adding less than a full charge, charge to
between 14°F to 20°F sub-cooling as measured on the
liquid lines at the condenser coil refrigerant outlets.
Table 6. System Compressors
Unit Size
Compressors (a)
Circuit 1 Circuit 2
SXRF/CXRC
20/20
10 10
25/29 15 10
29/29
15 10
30/35 10/10 10
35/35 10/10
10
40/40 10/15 10
50/50 15/15
10
60/60 15/15 15/15
SXRG/CXRC
20/20 10 10
25/29
15 10
32/32 15 15
Notes:
1 . All units have dual circuits
2 . The quantities shown apply to the CCRC/CIRC air-cooled
condenser
(a) Multiple compressors have manifold.
Table 7. Charge Add (R-410A)- lbs per 10 ft of line
Piping Size (in)
Charge (lbs)
Liquid Line Discharge Line
5/8
1.07 -
7/8 2.23 0.31
1 1/8
- 0.53
1 3/8 - 0.80
Note: Amounts listed are for 10 ft of pipe above 25’. Actual
requirements will be in direct proportion to the actual length
of piping.
Maintenance Periodic
Procedures
This section describes specific maintenance
procedures that must be preformed as a part of the
normal maintenance program for this unit.
Periodic Maintenance Checklist
☐ Inspect optional coil guard for debris that may be
blocking louvers as clean as required.
☐ Inspect coil surface for cleanliness and clean as
required.
☐ Manually rotate fan blades to ensure proper orifice
clearance. Inspect fan orifices for debris and
obstructions. Clean as required.
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