Bosch CLIMATE 5000 VRF RDCI Series, Руководство по установке

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6 720 862 437 (
2016/10
) RDCI Series – All DC Inverter Outdoor Units
12 | REFRIGERANT PIPE
CAUTION
• Pressurised nitrogen (3.9MPa; 40kgf/cm
2
) is used for strength
testing.
• Prior to connecting vacuum pump, ensure you release all the
nitrogen from all three pipes.
• Only Nitrogen can be used for pressure testing. Do not use any other
substances.
• Ensure the shut off valves are protected during brazing.
•
A Torr gauge must be used to measure the vacuum state.
5.11 Triple vacuum process
1) Vacuum from all three ports down to 2Torr.
2) Break vacuum with nitrogen to absorb moisture. Then repeat vacuum
process down to 1.6Torr.
3) Break Vacuum for with nitrogen to absorb moisture. Repeat vacuum
to achieve 1.5 Torr or lower.
CAUTION
■
Do not add refrigerant when nitrogen is present. Do not mix
refrigerants.
■
Do not use refrigerant for air vacuuming.
■
Before adding refrigerant leave the system on a vacuum for 2 hours
to see if the gauges rise. If the gauges rise please repeat strength/
tightness test and check for leaks.
5.12 Refrigerant amount to be added
1) Calculate the added refrigerant according to the diameter and the
length of the liquid side pipe. The refrigerant is R410A.
Note:
1. Assume equivalent pipe length of the branching pipe header to be
0.5m.
2. The refrigerant amount to be added of SBOX02 is 0.3kg/per,
of SBOX04/SBOX06 is 0.5kg/per.
Table.5-9
Pipe size on liquid
side
Refrigerant to be
added per meter
Ø6.4 0.023kg
Ø9.5 0.060kg
Ø12.7 0.120kg
Ø15.9 0.180kg
Ø19.1 0.270kg
Ø22.2 0.380kg
Ø25.4 0.550kg
Ø28.6 0.710kg
2) Add the additional quantity of calculated refrigerant from the low-
pressure pipe and liquid pipe.
5.13 The Key points of installing connective pipe-
work between cascaded outdoor units
1) When connecting the outdoor units, the pipes should be installed
horizontally (Fig5-7, Fig 5-8). It is not permitted to use method
shown in Fig 5.9.
2) All connective pipework between the outdoor units are not to be
installed above the outlets of the condenser. See Fig. 5.10..
Connect manifold gauges and vacuum pump to all three pipe connections.
Perform vacuum until for minimum of 2 hours.
Shut off vacuum pump and pressure with nitrogen to absorb moisture.
Repeat vacuum process for a further two hours.
Shut off vacuum pump and break vacuum for with nitrogen to absorb moisture.
Repeat vacuum process for a further 2 hours and achieve a minimum
of 1.5Torr.
If 1.5Torr cannot be achieved, repeat re-pressure and find leak.
Re-peat Triple Vacuum process.
Perform a triple evacuation
Into the vacuum state
Fig. 5-7
√ Correct way
Fig. 5-8
√ Correct way
Fig. 5-9
× Wrong way