Table of Contents
Advertisement
NOTE - Operation of this furnace in heating mode (indoor
blower operating at selected heating speed) with an ex-
ternal static pressure which exceeds 0.8 inches w.c. may
result in erratic limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a remov-
able access panel should be installed in the supply air
duct. The access panel should be large enough to permit
inspection (by reflected light) of the heat exchanger for
leaks after the furnace is installed. If present, this access
panel must always be in place when the furnace is oper-
ating and it must not allow leaks into the supply air duct
system. In horizontal units, install self tapping screws in
the three evaporator coil screw holes made for upflow ap-
plications to seal the top cap to the vestibule panel.
Return Air Plenum
Return air must not be drawn from a room where this fur-
nace, or any other gas-fueled appliance (i.e., water heat-
er), or carbon monoxide-producing device (i.e., wood fire-
place) is installed. When return air is drawn from a room,
a negative pressure is created in the room. If a gas appli-
ance is operating in a room with negative pressure, the
flue products can be pulled back down the vent pipe and
into the room. This reverse flow of the flue gas may re-
sult in incomplete combustion and the formation of carbon
monoxide gas. This toxic gas might then be distributed
throughout the house by the furnace duct system.
Return air can be brought in through the bottom or either
side of the furnace (return air brought in through either
side of the furnace allowed in upflow applications only). If
a furnace with bottom return air is installed on a platform,
make an airtight seal between the bottom of the furnace
and the platform to ensure that the unit operates proper-
ly and safely. Use fiberglass sealing strips, caulking, or
equivalent sealing method between the plenum and the
furnace cabinet to ensure a tight seal. If a filter is installed,
size the return air duct to fit the filter frame.
Pipe Fittings Specifications
All pipe, fittings, primer and solvent cement must conform
with American National Standard Institute and the Ameri-
can Society for Testing and Materials (ANSI/ASTM) stan-
dards. The solvent shall be free-flowing and contain no
lumps, undissolved particles or any foreign matter that
adversely affects the joint strength or chemical resistance
of the cement. The cement shall show no gelation, strati-
fication, or separation that cannot be removed by stirring.
Refer to TABLE 5 for approved piping and fitting materials.
IMPORTANT
SLP99UHV exhaust and intake connections are made
of PVC. Use PVC primer and solvent cement when
using PVC vent pipe. When using ABS vent pipe, use
transitional solvent cement to make connections to the
PVC fittings in the unit.
CAUTION
Solvent cements for plastic pipe are flammable liquids
and should be kept away from all sources of ignition.
Do not use excessive amounts of solvent cement when
making joints. Good ventilation should be maintained to
reduce fire hazard and to minimize breathing of solvent
vapors. Avoid contact of cement with skin and eyes.
PIPING AND FITTINGS SPECIFICATIONS
Schedule 40 PVC (Pipe)
Schedule 40 PVC (Fittings)
Schedule 40 CPVC (Pipe)
Schedule 40 CPVC (Fittings)
SDR-21 PVC or SDR-26 PVC (Pipe)
SDR-21 CPVC or SDR-26 CPVC (Pipe)
Schedule 40 ABS (Pipe)
Schedule 40 ABS (Fittings)
ABS-DWV (Drain Waste & Vent) (Pipe &
Fittings)
PVC-DWV (Drain Waste & Vent) Pipe &
Fittings)
PVC Pipe and Fittings
PRIMER & SOLVENT CEMENT
PVC & CPVC Primer
PVC Solvent Cement
CPVC Solvent Cement
ABS Solvent Cement
PVC Solvent Cement
PVC/CPVC/ABS All Purpose Cement
For Fittings & Pipe of the same material
ABS to PVC or CPVC Transition Solvent
Cement
ABS to PVC Transition Solvent Cement
CANADA PIPE & FITTING & SOLVENT
CEMENT
PVC & CPVC Pipe and Fittings
PVC & CPVC Solvent Cement
ABS to PVC or CPVC Transition
Cement
POLYPROPYLENE VENTING SYSTEM
PolyPro® by Duravent
InnoFlue® by Centrotherm
UL 1738 CERTIFIED GAS VENTING
SYSTEM
IPEX System1738 Schedule 40 PVC
Pipes and Fittings
IPEX System1738 PVC FGV Cement &
Primer
Page 13
TABLE 5
D1785
D2466
F441
F438
D2241
F442
D1527
D2468
D2661
D2665
IPEX UL1738
ASTM
SPECIFICATION
F656
D2564
F493
D2235
IPEX UL1738
D2564, D2235,
F493
D3138
IPEX UL1738
MARKING
ULCS636
ULCS636
UL1738
Advertisement
Table of Contents
