Lennox Dave Signature SL28XCV Installation Instructions Manual page 4

SETTING THE UNIT (Continued) –
Unit Placement
NOTICE!
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil, causing the
rubber to degrade. Failure to follow this notice could
result in damage to roof surface.
IMPORTANT
This unit must be matched with an indoor coil as
specified with AHRI. For AHRI Certified system match-
ups and expanded ratings, visit www.LennoxPros.com
Coils previously charged with HCFC-22 must be flushed.
WARNING
To prevent personal injury, as well as damage to panels,
unit or structure, observe the following:
While installing or servicing this unit, carefully stow all
removed panels so that the panels will not cause injury
to personnel, objects or nearby structures. Also, take
care to store panels where they will not be subject to
damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions (especially wind) that may cause
panels to be blown around and damaged.
IMPORTANT
Exhaust vents from dryers, water heaters and furnaces
should be directed away from the outdoor unit. Prolonged
exposure to exhaust gases and the chemicals contained
within them may cause condensation to form on the steel
cabinet and other metal components of the outdoor unit.
This will diminish unit performance and longevity
NOTICE!
Charging information is given on the charging
procedure sticker on the unit access panel. For more in-
depth information, consult the Installation and Service
Procedures manual on LennoxPros.com or through the
Technical Support department at 800-453-6669.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
REFRIGERANT PIPING
If this unit is being matched with an approved line set
or indoor unit coil that was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyvinyl ether (PVE)
oils are used in Lennox units charged with HFC-410A
refrigerant. Residual mineral oil can act as an insulator,
preventing proper heat transfer. It can also clog the
expansion device and reduce system performance and
capacity. Failure to properly flush the system per this
instruction and the detailed Installation and Service
Procedures manual will void the warranty.
Flush the existing line set per the following instructions.
For more information, refer to the Installation and Service
Procedures manual available on LennoxPros.com. CAU-
TION - DO NOT attempt to flush and re-use existing line
sets or indoor coil when the system contains contaminants
(i.e., compressor burn out).
Polyvinyl ether (PVE) oil is used in the SL28XCV com-
pressors. For installations of the SL28XCV unit with re-
frigerant lines or coils previously charged with R410A and
POE oil, Lennox recommends flushing the existing lines
and coil with R410A refrigerant to remove excess POE oil
that may be in the system.
If a new line set is being installed, size the piping per table 1.
NOTE - When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrica-
tion Guidelines manual available on LennoxPros.com
(Corp. 9351-L9), or contact the Technical Support Depart-
ment Product Application group for assistance.
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
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).
Page 4
IMPORTANT
IMPORTANT
WARNING