8
TTA-IOM-EN0110
Refrigerant Charging
and Evacuation
System Evacuation
1. After completion of leak check,
evacuate the system.
2. Attach appropriate hoses from
manifold gauge to gas and liquid
line pressure taps.
Note: Unnecessary switching of
hoses can be avoided and complete
evacuation of all lines leading to
sealed system can be accomplished
with manifold center hose and
connecting branch hose to a cylinder
of R-22 and vacuum pump.
3. Attach center hose of manifold
gauges to vacuum pump.
4. Evacuate the system to hold a
350 micron vacuum.
5. Close off valve to vacuum pump
and observe the micron gauge.
If gauge pressure rised above
500 microns in one (1) minute,
then evacuation is incomplete or
the system has a leak.
6. If vacuum gauge does not rise
above 500 microns in one (1)
minute, the evacuation should be
complete.
7. Remove vacuum pump. Attach
center hose of manifold gauge to
R-22 cylinder, purge the charging
line, open valve on R-22 cylinder
and allow refrigerant pressure to
build up to about 40 psig.
8. Close valve on the R-22 supply
cylinder and close valves on
manifold gauge.
9. Leak test the entire system. Using
proper procedures and caution,
repair any leaks found and repeat
the leak test.
Caution: Do not connect a
dual-circuit outdoor unit to a single
circuit evaporating unit. (blower)
Tubing Sizes Additional Additional See
Suction Liquid Tubing Length Refrigerant Note
1 1/8" 3/8" 15 ft. 0 lb. 11.5 oz. (1)
1 1/8" 3/8" 25 ft. 1 lb. 3.0 oz. (1)
1 1/8" 3/8" 32 ft. 1 lb. 8.0 oz. (1)
1 1/8" 3/8" 40 ft. 1 lb. 14.0 oz. (1)
1 3/8" 1/2" 15 ft. 1 lb. 4.0 oz. (2)
1 3/8" 1/2" 25 ft. 2 lb. 1.0 oz. (2)
1 3/8" 1/2" 32 ft. 2 lb. 11.0 oz. (2)
1 3/8" 1/2" 40 ft. 3 lb. 5.0 oz. (2)
1 5/8" 5/8" 15 ft. 1 lb. 15.5 oz. (3)
1 5/8" 5/8" 25 ft. 3 lb. 5.5 oz. (3)
1 5/8" 5/8" 32 ft. 4 lb. 3.2 oz. (3)
1 5/8" 5/8" 40 ft. 5 lb. 4.0 oz. (3)
1
Amounts shown are based on .75 ounces of refrigerant per foot
of 1 1/8" and 3/8" lines.
2
Amounts shown are based on 1.33 ounces of refrigerant per foot
of 1 3/8" and 1/2" lines.
3
Amounts shown are based on 2.1 ounces of refrigerant per foot
of 1 5/8" and 5/8" lines.
Note: for tubing over 40 ft. calculate the additional refrigerant needed,
based on notes above.
Note: Each TTA unit ships with R-22 holding charge.
Table 4 - Additional Required Refrigerant
TTA-IOM-EN0110.indd 8TTA-IOM-EN0110.indd 8 3/19/10 9:20:50 AM3/19/10 9:20:50 AM
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