Check the suspension of the refrigerant pipes as described in chapter Refrigerant pipe suspension, see on page 41.
1. Heat pump system.
2. Heat recovery system.
A. Stop valve, high pressure (gas).
B. Stop valve (liquid).
C. Stop valve, low pressure (gas).
D. Measurement indicators.
E. Nitrogen gas bottle.
F. Refrigerant bottle and balance.
G. Vacuum pump.
H. Refrigerant gas pipe, high pressure.
I. Refrigerant liquid pipe
J. Indoor units.
K. Multikit.
L. Insulation.
M. CH unit.
N. Refrigerant gas pipe, low pressure.
Check the seal of the welds and flared connections. To do so, connect the measurement indicators on the check joints of
the stop valves and on one vacuum pump or nitrogen gas bottle, using the flexible charge pipes of the indicators.
N O T E
• Only tools and indicators specifically for use with R410A refrigerant gas should be used.
• Do not open the stop valves on the outdoor unit.
D A N G E R
Only use
nitrogen gas when testing for leaks. Never use oxygen, acetylene or fluorocarbon gas; these could result
in an intoxication or explosion.
Apply a maximum pressure of 4.15 MPa of nitrogen gas to the installation.
Check there are no refrigerant leaks in the welds and the flared connections of all the system. To do so, use a gas leak
sensor or a soap and water solution.
If any leaks are found in the installation, repair and repeat the airtight test.
¿ Installation vacuum
Connect the measurement indicators on the check joints of the stop valves.
N O T E
Only tools and indicators specifically for use with R410A refrigerant gas should be used.
Vacuum the installation to a maximum pressure of -0.1 MPa (-756 mmHg) or lower.
On completion of the vacuum, close the indicator valve and switch off the vacuum pump.
3 Piping work and
refrigerant charge
59
SMGB0065 rev. 1 - 12/2010
3
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