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Once all piping is complete, check for leaks and dehydrate the field piping as follows:
1. Pressurize the field piping to 150 PSIG (1034 kPa) using dry nitrogen with a trace of refrigerant.
Check system for leaks with a suitable leak detector.
2. After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum
on the field piping with a suitable pump.
3. After 15 minutes, check the pressure readings and, if they have not changed, break vacuum with
dry nitrogen. Pull a second vacuum to 250 microns or less. Recheck the pressure after 15 minutes.
Table 21 Unit refrigerant charge
Model
R22 Charge R407C Charge
Model
R22 Charge R407C Charge
lbs (kg) lbs (kg) lbs (kg) lbs (kg)
BF/BU 036E 0.56 (0.25) 0.5 (0.2) PF_042A-_H 26.63 (12.08) 25.8 (11.7)
BF/BU 035E 0.56 (0.25) 0.5 (0.2) PF_041A-_H 26.63 (12.08) 25.8 (11.7)
BF/BU 060E 0.81 (0.37) 0.8 (0.4) PF_067A-_L 26.63 (12.08) 25.8 (11.7)
BF/BU 059E 0.81 (0.37) 0.8 (0.4) PF_066A-_L 26.63 (12.08) 25.8 (11.7)
MC_40/39A 13.31 (6.04) 12.9 (5.8) PF_Z67A-_L 51.69 (23.45) 50.1 (22.7)
MC_65/64A 27.00 (12.25) 26.1 (11.8) PF_Z66A-_L 51.69 (23.45) 50.1 (22.7)
PF_042A-_L 13.31 (6.04) 12.9 (5.8) PF_067A-_H 51.69 (23.45) 50.1 (22.7)
PF_041A-_L 13.31 (6.04) 12.9 (5.8) PF_066A-_H 51.69 (23.45) 50.1 (22.7)
PF_Z42A-_L 26.63 (12.08) 25.8 (11.7) MC_44/43W 3.38 (1.53) n/a
PF_Z41A-_L 26.63 (12.08) 25.8 (11.7) MC_69/68W 5.88 (2.67) n/a
Table 22 Line charges - refrigerant per 100 ft (30 m) of Type "L" copper tube
O.D.
R22 R407C
Liquid Line
lbs (kg)
Suction Line
lbs (kg)
Liquid Line
lbs (kg)
Suction Line
lbs (kg)
1/2" 7.3 (3.3) 0.2 (0.1) 6.9 (2.9) -
5/8" 11.7 (5.3) 0.3 (0.2) 11.0 (4.6) 0.4 (0.2)
7/8" 24.4 (11.1) 0.7 (0.3) 23.0 (9.6) 1.0 (0.4)
1-1/8" 41.6 (18.9) 1.2 (0.6) 39.3 (16.3) 1.7 (0.7)
1-3/8" 63.3 (28.7) 1.9 (0.8) 59.8 (24.8) 2.7 (1.1)
Table 23 Recommended refrigerant lines (R22 or R407C) sizes OD copper
Equivalent Feet (m)
3.5 Tons
036E (035E)
5 Tons
060E (059E)
Suction Liquid Suction Liquid
0-50 (0-15) 7/8" 1/2" 1-1/8" 1/2"
51-100 (16-30) 1-1/8" 1/2" 1-1/8" 5/8"
101-150 (31-45) 1-1/8" 5/8" 1-3/8" 5/8"
Table 24 Line coupling sizes
Model
(Tons)
Line Size
OD Cu, in.
Coupling
Size
Torque
lb-ft.
33/8 #610-12
5 1/2 & 5/8 #10 35-45
3 7/8 #11 35-45
5 1-1/8 #12 50-65