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drain- -pan condensate connection to prevent the pan from
overflowing (See Fig. 7). Prime the trap with water. When using
a gravel apron, make sure it slopes away from the unit.
If the installation requires draining the condensate water away
from the unit, install a 2- -in. trap at the condensate connection to
ensure proper drainage (See Fig. 7). Make sure that the outlet of
the trap is at least 1 in. lower than the drain- -pan condensate
connection. This prevents the pan from overflowing.
Prime the trap with water. Connect a drain tube - - using a
minimum of 3/4- -in. PVC or 3/4- -in. copper pipe (all
field- -supplied) - - at the outlet end of the 2- -in. trap. Do not
undersize the tube. Pitch the drain tube downward at a slope of at
least 1- -in. for every 10 ft of horizontal run. Be sure to check the
drain tube for leaks.
1" MIN.
Fig. 7 - - Condensate Trap
Step 7 — INSTALL FLUE HOOD
The flue hood assembly is shipped in the return section of the
indoor blower compartment (See Fig. 9). Remove the return duct
cover to locate the assembly.
Dedicated low NOx models MUST be installed in California Air
Quality Management Districts where a Low NOx rule exists.
These models meet the California maximum oxides of nitrogen
(NOx ) emissions requirements of 40 nanograms/joule or less as
shipped from the factory.
NOTE:
Low NOx requirements apply only to natural gas
installations.
WARNING
!
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury
or death and unit component damage.
The venting system is designed to ensure proper venting. The
flue hood assembly must be installed as indicated in this
section of the unit installation instructions.
Install the flue hood as follows:
1. This installation must conform with local building codes
and with the National Fuel Gas Code (NFGC), ANSI
Z223.1 (in Canada, CAN/CGA B149.1, and B149.2) or
NFPA (National Fire Protection Association) latest
revision. Refer to Provincial and local plumbing or
wastewater codes and other applicable local codes.
2. Remove flue hood from shipping location (inside the
return section of the blower compartment- -See Fig. 9).
Place vent cap assembly over flue panel. Orient screw
holes in vent cap with holes in the flue panel.
3. Secure flue hood to flue panel by inserting a single screw
on the right side and the left side of the hood.
Step 8 — INSTALL GAS PIPING
The gas supply pipe enters the unit through the access hole
provided. The gas connection to the unit is made to the 1/2- -in.
FPT gas inlet on the manual shutoff or gas valve.
Install a gas supply line that runs to the heating section. Refer to
Table 2 and the NFGC for gas pipe sizing. Do not use cast- -iron
pipe. It is recommended that a black iron pipe is used. Check the
local utility for recommendations concerning existing lines. Size
gas supply piping for 0.5 in. wc maximum pressure drop. Never
use pipe smaller than the 1/2- -in. FPT gas inlet on the unit gas
valve.
For natural gas applications, the gas pressure at unit gas
connection must not be less than 4.0 in. wc or greater than 13 in.
wc while the unit is operating. For propane applications, the gas
pressure must not be less than 7.0 in. wc or greater than 13 in. wc
at the unit connection.
An 1/8- -in. NPT plugged tapping, accessible for test gage
connection, must be installed immediately upstream of the gas
supply connection to the gas valve.
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFGC ANSI
Z223.1- -1988 NFPA latest edition (in Canada, CAN/CGA
B149.1, (2)- -M86). In the absence of local building codes, adhere
TRAP
to the following pertinent recommendations:
OUTLET
2" MIN.
C99013
7
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4
in. in every 15 ft to prevent traps. Grade all horizontal runs
downward to risers. Use risers to connect to heating
section and to meter.
2. Protect all segments of piping system against physical and
thermal damage. Support all piping with appropriate
straps, hangers, etc. Use a minimum of one hanger every 6
ft. For pipe sizes larger than
recommendations of national codes.
3. Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections. Use
only pipe dope that is resistant to action of liquefied
petroleum gases as specified by local and/or national
codes. Never use Teflon tape.
4. Install sediment trap in riser leading to heating section
(See Fig. 8). This drip leg functions as a trap for dirt and
condensate.
IN
OUT
Fig. 8 - - Sediment Trap
1/2
in., follow
TEE
NIPPLE
CAP
C99020
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