Trane R Series, Installation Operation & Maintenance

Page: 55 / 188

RLC-SVX07A-EN 55
Installation - Remote Condenser
NOTE: Failure to properly mount and insulate the saturated condensing
refrigerant temperature sensor could cause poor control and/or possible
compressor damage.
If the sensor cannot be located at the point where the saturated gas enters
the subcooler, locate the sensor closer to the subcooler rather than the
condenser discharge gas. If saturated condensing temperature cannot be
measured, it is preferred to measure liquid temperature rather than discharge
temperature.
Refer to "Interconnecting Wiring" on Page 62 for interconnecting wiring of
sensors for non-RTCA units.
NOTE: The RTUA unit ships with the outdoor ambient sensor and two
saturated condenser temperature sensors in the control panel.
Refrigerant Charge Determination
The approximate amount of the refrigerant charge required by the system
must be determined by referring to Table
14 and must be verified by running
the system and checking the liquid line sightglasses.
To determine the approximate charge, first refer to Table 13 and establish the
required charge without the field-installed piping. Then refer to Table 14 , to
determine the charge required for the field-installed piping. The approximate
charge is therefore the sum of the values from Tables
14 and 15 .
Table 14 System Refrigerant Charge
Circuit Size LBS of R-22
35 58
40 61
50 73
60 98
Table 15 Field-Installed Piping Charge
PIPE O.D DISCHARGE LINE (LBS.) LIQUID LINE (LBS.)
7/8 ----- 24
1 1/8 ----- 41
1 3/8 4 62
1 5/8 6 88
2 1/8 10 153
2 5/8 15 236
Note:
The amounts of refrigerant listed in Table 15 are based on 100 feet of pipe.
Actual requirements will be in direct proportion to the actual length of the
piping.
Note:
Table 14 assumes:
Liquid temperature = 100 F
Saturated Discharge Temp. = 125 F
Discharge Superheat = 55 F