Trane RTHC - Refrigerant Charge; If a low refrigerant charge is suspected, first determine the cause of lost refrigerant.; Evacuation and Dehydration; Refrigerant Charging

Installation, Operation and Maintenance 9 - 5
Figure 34
Oil Filter Replacement Chart (E,D, C and B Frames)
Refrigerant Charge
If a low refrigerant charge is suspected, first
determine the cause of lost refrigerant. Once the
problem is repaired follow the procedures below for
evacuating and charging the unit.
Evacuation and Dehydration
1 Disconnect ALL power before/during evacuation.
2 Connect the vacuum pump to the 5/8” flare
connection on the bottom of the evaporator and/or
condenser.
3 To remove all of the moisture from the system and
to insure a leak free unit pull the system down
below 500 microns.
4 After the unit is evacuated, perform a standing
rise test for at least an hour. The pressure should
not rise more than 150 microns. If the pressures
rises more than 150 microns then either a leak is
present or moisture is still in the system.
NOTE: If oil is in the system, this test is more difficult.
The oil is aromatic and will give off vapors that will
rise the pressure of the system.
Refrigerant Charging
Once the system is deemed leak and moisture free,
use the 5/8” flare connections at the bottom of the
evaporator and condenser to add refrigerant charge.
Use the followoing table for the correct charge
amounts.
Table 30Recommended Refrigerant Charges
NOTE: Refer to the unit nameplate for specific
information on optimum oil and refrigerant charge.
175/450 Ton RTHC Compressor
Oil Filter Replacement Chart
0
5
10
15
20
25
30
35
40
45
50
20 40 60 80 100 120 140 160
Condensing Press - Suction Press (psid)
Oil Filter Press Drop (psid)
D- and E-Frame Normal Press Drop C-Frame Normal Press Drop
Max Pressure Drop B-Frame Normal Press Drop
Compressor
(digit 6 and 7)
Evap (digit
12 and 13)
Condenser
(digit 16
and 17)
HFC-134A
charge (lb
(kg))
B1 B1 B1 410 (186)
B1 C1 D1 450 (204)
B2 C2 D2 450 (204)
B2 B2 B2 410 (186)
C2 G1 G1 850 (386)
C2 D3 E3 575 (261)
C1 E1 F1 600 (272)
C1 B2 C1 420 (191)
C1 B3 C2 420 (191)
C2 B3 C2 420 (191)
D2 G3 G3 850 (386)
D2 F2 F3 740 (336)
D2 D2 E2 575 (261)
D1 G2 G2 850 (386)
D1 F1 F2 740 (336)
D1 D1 E1 575 (261)
D3 D2 E2 575 (261)
D3 F2 F3 740 (336)
D3 G3 G3 850 (386)
E3 D2 E2 575 (261)
E3 F2 F3 740 (336)
E3 G3 G3 850 (386)