TTA-R407C-EN1113
8
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 R407C and vacuum pump.
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 0.75 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: There is holding charge of refrigerant and N
2
charged from factory.
However, when install the unit, system must be vacuumed and recharged
refrigerant in the field.
Table 4 - Additional Required Refrigerant
(R407C)
TTA 060 FD
TTA 120 FD
TTA 240 FD
TTA 075 ED
TTA 100 ED
TTA 120 ED
TTA 150 ED (New)
TTA 150 ED
TTA 180 ED
TTA 200 ED
TTA 240 ED
TTA 150 ED0G
TTA 180 ED0G
TTA 200 ED0G
TTA 240 ED0G
5.1
8.5
16.0
11.2
18.7
37.4
10.30 23.81
3. Attach center hose of manifold
gauges to vacuum pump.
4. Evacuate the system to hold a
350 micron (-76 cm.Hg) 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
R407C cylinder, purge the charging
line, open valve on R407C cylinder
and allow refrigerant pressure to
build up to about 40 psig.
8. Close valve on the R407C 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.
4Caution: Do not connect a
dual-circuit outdoor unit to a single
circuit evaporating unit. (blower)
TTA-R407C-EN1113.indd 8TTA-R407C-EN1113.indd 8 12-Sep-16 13:28:2312-Sep-16 13:28:23
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