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Brazing Connection Procedure
1 − Cut ends of the refrigerant lines square (free from nicks
or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.
2 − Before making line set connections, use dry nitrogen to
purge the refrigerant piping. This will help to prevent
oxidation and the introduction of moisture into the sys-
tem.
3 − Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper−to−copper brazing or 45 percent
silver alloy for copper−to−brass or copper−to−steel braz-
ing) which are rated for use with HCFC2 refrigerant.
Wrap a wet cloth around the valve body and the copper
tube stub. Braze the line set to the service valve.
4 − Wrap a wet cloth around the valve body and copper
tube stub to protect it from heat damage during braz-
ing. Wrap another wet cloth underneath the valve body
to protect the base paint.
NOTE − The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating, sealing
and rigidity.
5 − Install a field−provided thermal expansion valve (ap-
proved for use with HCFC2 refrigerant) in the liquid line
at the indoor coil.
Refrigerant Metering Devices
Use 10ACC units in either TXV systems or fixed orifice sys-
tems. See the Lennox Engineering Handbook for approved
TXV and fixed orifice match-ups and application informa-
tion. Table 1 lists the unit liquid and vapor line sizes and cor-
responding line sets.
Fixed Orifice Systems
10ACC units are shipped with a fixed orifice refrigerant me-
tering device. Replace the existing indoor unit fixed orifice
with the orifice supplied with the outdoor unit. Place the
supplied fixed orifice sticker on the indoor cabinet after
installation. See table 2 for the fixed orifice size for each
unit. In nonstandard applications, the provided fixed orifice
may not be appropriately sized. Refer to the Engineering
Handbook for specific orifice information.
Fixed Orifice Drill Sizes
Unit
Fixed Orifice
Catalog #
10ACC−018
10ACC−024
10ACC−030
10ACC−036
10ACC−042
10ACC−048
10ACC−060
Install the fixed orifice as shown in figure 8. Do not twist the
cap tubes when loosening the seal nut from the orifice
housing.
Metering Device Installation
distributor
o−ring
Expansion Valve Systems
Expansion valves equipped with Chatleff fittings are avail-
able from Lennox. Refer to the Engineering Handbook for
expansion valves for use with specific match−ups.
If you install a expansion valve with an indoor coil that
includes a fixed orifice, remove the orifice before the
expansion valve is installed.
IMPORTANT
Failure to remove the fixed orifice when installing an
expansion valve on the indoor coil will result in im-
proper operation and damage to the system.
Manifold Gauge Set
When checking the unit charge, use a manifold gauge set
that is equipped with low loss" hoses. Do not use a man-
ifold gauge set with anything other than a low loss" hose.
Page 9
Table 2
Fixed Orifice Drill Size
42J38
.053
60M29
.061
42J44
.065
42J50
.077
42J52
.080
42J55
.086
42J61
.098
orifice
(factory−installed)
valve OR orifice
o−ring
expansion
valve (opt.)
strainer
liquid line
stub
Figure 8
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