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Figure 23. Horizontal Air-Right Drain-Trap Installation
3.
Move cap from inducer-pan port F, located in lower
right-hand corner of inducer pan, to port C, located in
upper right-hand corner of inducer pan.
4.
From underside of casing, insert drain trap through
hole in casing, port B end first. Slide t r ap toward
inducer pan with casing between trap mounting guides.
Use first set of guides for 17 1/2" and 23 1/2" wide
models. Use second set of guides for 20 1/2" wide
models. Trap will protrude into casing with port B
pointed toward inducer-pan-drain port F. Port A of trap
will be outside of casing and pointed toward front of
furnace.
5.
Cut condensate hose to a length of 4 1/2 inches.
Attach hose and one hose clamp to port B of drain trap.
Attach other end of condensate hose and hose clamp
to inducer pan drain port F.
6.
Complete installation of condensate drain system from
condensate trap (port A) with field supplied parts.
SECTION 6. INSTALLING GAS
PIPING
PREPARATION
Refer to the current National Fuel Gas Code ANSI
Z223.1/NFPA 54 or CAN/CGA B149 Installation Codes and
local codes for gas piping requirements and sizing. Pipe
size running to furnace depends on:
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Length of pipe
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Number of fittings
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Specific gravity of gas
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Input requirements (Btu per hour) of all gas -fired
appliances attached to same main supply line.
Installer's Information Manual
Plan furnace gas supply piping so it will not interfere with
removal of burner assembly, front door or blower door for
servicing.
Make sure gas piping is large enough for all appliances
connected to it to operate at once without lowering gas
supply pressure. Failure to do so could cause lighting or
burning problems on any of the appliances.
Always use a pipe thread compound that is resistant to
propane (LP) gas solvent action. Sparingly apply thread
compound to all joints on male threads only, starting two
threads from the end.
INSTALLATION
Gas supply piping can be installed from either side of
furnace casing. Install gas supply piping according to
Figure 24 and the following instructions.
1.
Install a 4-inch long x 1/2" NPT black-iron pipe nipple
through gas entry grommet and into gas-control inlet
elbow. Install a black iron pipe elbow on 4 -inch nipple.
Tighten gas tight. Do not over tighten.
2.
Install a ground-joint union and a drip leg immediately
upstream of the furnace. Ground-joint union allows
easy servicing of burner assembly and fu rnace gas
control.
Ground-joint union must be listed by a
nationally recognized testing laboratory.
Figure 24. Gas Line Installation (downflow position shown).
3.
Install a manual "equipment" shut-off valve in gas
supply line immediately upstream of ground-joint union.
Equipment shut-off valve must be listed by a nationally
recognized testing laboratory.
TESTING FOR LEAKS
Isolate furnace and its gas control from gas supply line
during leak checks.
Gas-supply line test pressure
determines how you isolate gas control.
Page 19
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