Installation - Mechanical — Remote Evaporator Option
RTAC-SVX01J-EN 63
Refrigerant and Additional Oil Charge
Refrigerant Charge Determination
The approximate amount of refrigerant charge required by
the system must be determined by referring to Table 34
and must be verified by running the system and checking
subcooling.
1. To determine the appropriate charge, first refer to the
T
able 1, p. 12 through Table 10, p. 21 in section
“General Data,” p. 11 to establish the required charge
without the field-installed piping.
2. Next, determine the charge required for the
field-installed
piping by referring to Table 34, p. 63.
3. Sum the values of step 1 and step 2 to determine the
circuit
charge.
Note: The
amounts of refrigerant listed in Table 34, p. 63
are per 100 feet of pipe. Requirements will be in
direct proportion to the actual length of piping.
Oil Charge Determination
The unit is factory charged with the amount of oil required
by the system, without the field-installed piping.The
amount of the additional oil required is dependent upon
the amount of refrigerant that is added to the system for
the field installed piping.
Use the following formula to calculate the amount of oil to
be
added:
Pints of Oil = [lbs of R-134a added for field-installed
piping]/1
00
Figure 27. Field wiring between remote evaporator and condensing unit
Table 34. Field installed piping charge
Pipe O.D. (in)
Suction Line
lbs of R134a per
100ft
Liquid Line
lbs of R134a per
100ft
1-3/8 N/A 62.4
1-5/8 N/A 88.3
2-1/8 N/A 153.6
2-5/8 N/A 236.9
3-1/8 5.0 N/A
3-5/8 6.8 N/A
4-1/8 8.8 N/A
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