Check that the pressure reading on the indicators remains stable for an hour or more. If this is not the case, check there
are no refrigerant leaks at the welds and the flared connections of all the system.
N O T E
If the
maximum pressure of -0.1 MPa (-756 mmHg) or less is not obtained, and there are no leaks, keep the vacuum
pump running for one or two hours.
If any leaks are found in the installation, repair and repeat the airtight test.
Replace the stop valve covers and tighten to the corresponding torque:
• Heat pump system: Details of the gas and liquid stop valves, see on page 44.
• Heat recovery system: Details of the gas and liquid stop valves, see on page 52.
¿ Quantity of refrigerant charged in the W0 outdoor unit
Outdoor unit
Quantity of refrigerant charged in the W0
outdoor unit (kg)
Outdoor unit
Quantity of refrigerant charged in the W0
outdoor unit (kg)
RAS-8FSXN 6.5 RAS-14FSXN 9.0
RAS-10FSXN 6.5 RAS-16FSXN 9.0
RAS-12FSXN 7.0 RAS-18FSXN 10.5
N O T E
For combinations
of two or three outdoor units, the quantity of refrigerant corresponds to the sum of the refrigerant
charged in each of the units.
¿ Maximum additional refrigerant charge
The total additional charge must not exceed the maximum additional refrigerant charge indicated in the following table.
Outdoor unit Maximum additional refrigerant charge (kg) Outdoor unit Maximum additional refrigerant charge (kg)
RAS-(8/10)FSXN 28 RAS-(18-24)FSXN 51
RAS-12FSXN 36 RAS-(26-54)FSXN 63
RAS-(14/16)FSXN 40 — —
¿ Method of calculation of the total additional refrigerant charge
Although
the outdoor unit is supplied charged with refrigerant, it is necessary to add a certain additional amount depending
upon the length of the refrigerant pipes and the capacity ratio of the indoor units.
The different factors determining the total additional refrigerant charge (W) in the system are given as W1, W2 and W3.
The additional quantity of refrigerant is calculated using the following method.
W1: additional refrigerant charge according to the length of the refrigerant liquid pipes.
Nominal diameter
Total length (m)
Quantity of refrigerant per
metre of pipe
Additional refrigerant charge
(kg)
mm Inches
ø22.2 7/8 ___ m x 0.39
ø19.05 3/4 ___ m x 0.28
ø15.88 5/8 ___ m x 0.19
ø12.7 1/2 ___ m x 0.12
ø9.53 3/8 ___ m x 0.06
ø6.35 1/4 ___ m x 0.03
Total additional refrigerant charge = ______ kg
3 Piping work and
refrigerant charge
60
SMGB0065 rev. 1 - 12/2010
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