4
01. PIPE RUN PLANNING
Planning of pipe runs should take into account the following criteria:
NOTE: Non-compliant pipe work will void the warranty.
02. NITROGEN PURGING
All brazing to be done with OFN (oxygen-free nitrogen) purging through the pipe work system.
Nitrogen should be circulated into the pipe work branches and are to be welded using a flow regulator. This prevents oxidation
of the inside of the pipe surface. This oxidation can block filters and LEV valve orifices, and cause oil contamination and
compressor failure.
ALL BRAZING MUST BE CARRIED OUT USING DRY NITROGEN PURGING.
NOTE: Failure to follow this guideline will void the warranty.
PRACTICE PIPING PROCEDURE [R410A]
Nominal Diameter
Outside Diameter
(mm)
R22/R407C
mm across flare face
R410A
mm across flare face
1/4”
3/8”
1/2”
5/8”
3/4”
6.35
9.52
12.7
15.88
19.05
9
13
16.2
19.4
23.3
9.1
13.2
16.6
19.7
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PIPE:
All pipe used in R410A installations is to comply with
AS/NZ Standard 1677 Part 2. Copper tube of the correct
wall thickness must be used.
SEALED PIPE:
Hard and soft drawn copper tube stored on site prior to
installation must have plastic end caps fitted to prevent
ingress of moisture and foreign objects. Bends and fittings
should be kept dry and in the original packing prior to
installation.
PENETRATIONS:
All building penetrations should be made in such a way that
the bare copper pipe does not contact the building fabric.
BENDS:
Minimise the number of bends. Ensure all soft drawn bends
are made with the correct size benders and are of full internal
diameter.
PIPE CLAMPS:
Ensure that the pipe work is fixed so there is no tension on
the indoor or outdoor unit connections. This can lead to stress
fractures at the flare/flange.
PIPE RUN LENGTHS:
Ensure the maximum pipe run lengths comply with system
specifications.
03. FLARE / FLANGE JOINTING PROCEDURE
R410A operates at much higher pressures than R22 and R407C refrigerants.
For this reason copper flare connection dimensions must meet the following criteria:
Summary of Contents for BDT CITY MULTI
Page 41: ...41 S SERIES OUTDOOR UNIT WIRING INPUTS AND OUTPUTS CITY MULTI ONLY ...
Page 42: ...42 INDOOR UNIT WIRING INPUTS AND OUTPUTS CITY MULTI ONLY INPUTS AND OUTPUTS Continued ...
Page 44: ...44 RECOMMENDED M NET WIRING PROCEDURE CABLE LIMITATIONS AND SYSTEM EXAMPLES ...
Page 47: ...47 ...
Page 48: ...48 BASIC SYSTEM M NET WIRING AND ADDRESSING EXAMPLE M NET ADDRESSING Continued ...
Page 63: ...63 DIP SWITCHES INDOOR UNITS ...
