Armstrong Air BCE7S Series, Руководство по установке

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507746-01 Issue 1821 Page 10 of 39
Brazing Connections
Polyolester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub
caps until you are ready to make connections.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may
result in pressurization of the low side
shell and suction tubing. Application
of a brazing torch to a pressurized
system may result in ignition of the
refrigerant and oil mixture. Check the
high and low pressures before
applying heat.
WARNING
Danger of explosion!
Can cause equipment damage, injury, or
death.
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or
air conditioning system, use a regulator
that can control the pressure down to 1
or 2 psig (6.9 to 13.8 kPa).
WARNING
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
CAUTION
To prevent the build-up of high levels of nitrogen when
purging, it must be done in a well-ventilated area.
Purge low-pressure nitrogen (1 to 2 psig) through
the refrigerant piping during brazing. This will help to
prevent oxidation and the introduction of moisture into
the system.
IMPORTANT
Model
Liquid
Line
Vapor
Line
L15 Line Sets
24
3/8ʺ
(10mm)
5/8ʺ
(16mm)
L15 line set sizes are
dependent on unit
match-up. See Product
Specifications for outdoor
unit to determine correct
line set sizes
30, 36
3/8ʺ
(10mm)
3/4ʺ
(19mm)
42, 48
3/8ʺ
(10mm)
7/8"
(22mm)
60
3/8ʺ
(10mm)
7/8"
(22mm)
Field fabricated
NOTE
- Some applications may require a field-provided 7/8ʺ
to 1-1/8ʺ adapter.
Table 4. Refrigerant Connections and Line Set
Requirements
Refrigerant lines must be connected by a qualified
technician in accordance with established procedures.
Refrigerant lines must be clean, dehydrated, refrigerant-
grade copper lines. Air handler coils should be installed
only with specified line sizes for approved system
combinations.
Handle refrigerant lines gently during installation. Sharp
bends or kinking in the lines will cause a restriction.
Do not remove sealing caps from the refrigerant piping
or unit connection points until connections are ready to
be completed.
IMPORTANT