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DUAL POWER II
PIPING AND CABLE CONNECTION
1- Connect pressure gauges to the circuit.
Vacuum deair for 30 minutes. Introduce the
oil in accordance with the table. Introduce the
gas in accordance with the table.
!
Definition of R134a refrigerant gas charge, according to length of pipes in the facility
Taking an initial charge of 680 g of R-134a as the reference, the amount of refrigerant to be added per length
of pipe is:
• 65 g of R134a refrigerant per metre of 3/8" pipe installed (high pressure in liquid state).
• 5 g of R134a refrigerant per metre of 5/8" or 3/4" pipe installed (low pressure in gas state).
Examples:
In a facility consisting of a 4-metre 3/8" pipe and a 4-metre 5/8" pipe, the ideal charge is:
Initial charge 680 g + 4 m of 3/8" pipe (4 x 65 = 260 g) + 4 m of 5/8" pipe (4 x 5 = 20 g),
In a facility consisting of an 8-metre 3/8" pipe and an 8-metre 3/4" pipe, the ideal charge is:
Initial charge 680 g + 8 m of 3/8" pipe (8 x 65 = 520 g) + 8 m of 3/4" pipe (8 x 5 = 40 g),
TABLE
Total length
of piping
6 m
7 m
8 m
9 m
10 m
11 m
12 m
13 m
14 m
15 m
16 m
17 m
the charge calculation would be:
680 + 260 + 20 = 960 g of R134a refrigerant gas
the charge calculation would be:
680 + 520 + 40 = 1240 g of R134a refrigerant gas
Oil
to be introduced
20 cc
35 cc
50 cc
65 cc
80 cc
95 cc
110 cc
120 cc
135 cc
150 cc
165 cc
180 cc
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