Refrigerant Charge - Johnson Controls YORK VCH 20A Instructions D'installation

Draining and drying
Air does not act as refrigerant because it
cannot be liquefied by the compressor.
The air and humidity that remain in the cool-
ing system have undesirable effects, such
as those listed below. Consequently, they
should be eliminated completely.
- High pressure increases.
- Consumed power increases.
- The performance of the unit decreases.
Refrigerant charge and pipe diameters
Nominal charge
Model R-410A
(Kg.)
VCH 20A/VIR 25A 8.5
VCH 25A/VIR 25A
8.5
VCH 30A/VIR 40A 12
VCH 40A/VIR 40A 12
VCH 45A/VIR 45A 9.5 x 2
VCH 60A/VIR 60A
10.5 x 2
VCH 75A/VIR 75A 15 x 2
VCH 90A/VIR 90A 1 x 2
* Starting from a total of 20 m. in length of straight sections (horizontal and vertical) of interconnecting pipes between units, a minimum 7-litre suction accumulator should be installed in the gas line (of
larger diameter).
- The water contained in the air can freeze
and block the capillaries.
- Water can cause the corrosion of certain
parts of the circuit and the deterioration of
the compressor.
Process
In each circuit:
1- Connect a vacuum pump and a service
pressure gauge.
Number of circuits Gas line diameter
1 1 1/8" (28.5 mm)
1 1 1/8" (28.5 mm)
1 1 1/8" (28.5 mm)
1 1 1/8" (28.5 mm)
2 1 1/8" (28.5 mm)
2 1 1/8" (28.5 mm)
2 1 3/8" (35 mm)
2 1 3/8" (35 mm)
2- Carry out a vacuum of up to 50 microns,
3- Check for leaks.

Refrigerant charge

The refrigerant charge is calculated with a
pipe length of 7.5 meters. See the refriger-
ant charge in the table below, by models
and size.
Additional charge,
Liquid line diameter
grs. (per metre)
1/2" (12.7 mm) 112
1/2" (12.7 mm) 112
5/8" (15.87 mm) 170
5/8" (15.87 mm) 170
1/2" (12.7 mm) 112
5/8" (15.87 mm) 170
7/8" (22 mm) 333
7/8" (22 mm) 333
GB
minimum.
L
Maximum length
Maximum equivalent
in straight sections
length unit intercon-
of interconnecting
necting pipes (m)
pipes (m)
50 *
50 *
50
50
50
50
50
50
L
E
0
0
0
0
0
0
0
0
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