FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 57
6.2.6 Insulation
For insulating pipework:
– All insulation (e.g. Armaflex or equivalent) shall be class O minimum 3/8" wall thick-
ness
– All joints and edge splits must be glued or taped on suction lines
– Vapour sealing is not required on hot gas lines
– Any painting of insulation installed outdoors must be completed in line with manu-
facturer's guidelines
Each site must be individually assessed depending on pipework exposure, position,
length and accessibility to pipework, but for
Multi -DENCO units:
A-Version: Discharge lines and liquid lines do not need to be insulated, but may be required due
to site conditions and accessibility to pipework. We recommend insulating the liquid
line in the raised floor to avoid heating the cold air.
X-Version: Both lines (suction and expansion) MUST be insulated.
6.2.7 Cutting tubes
Where appropriate, pipework and cables shall be sleeved when passing through buil-
ding walls or roof structures.
When cutting copper tubing or pipe, care must be exercised to prevent the filings or
cuttings from entering the pipe. Some effective means should be used to clean out the
small particles of copper when they do enter the tube or pipe. When cutting copper
tubing with a wheel cutter, it is extremely important to use sharp wheels. The copper
wears the edge of the wheels more quickly than might be expected; therefore the con-
dition of the wheel must be checked regularly. Always ream the tube ends to remove
burrs.
6.2.8 Brazing
Brazed joints are to be made with Easy-Flo
®
or similar copper alloy rod. Flux is not
required for joining copper to copper. When bronze or brass is involved, Silver-Flow
®
self-fluxing rod or similar is required.
NOTE!
We recommend using a wheel cutter as the best method for cutting pipework.
NOTE – IMPORTANT!
When soldering or brazing, purge a small amount of dry nitrogen through the
pipe to prevent oxidation and scaling internally. Failure to purge nitrogen whilst
brazing will result in scale build up and this
WILL block the
Electronic Expansion Valve (EEV).
Any subsequent scale found within the valve body may result in voiding of
warranty!