Bryant Legacy 674D Скачать руководство пользователя страница 8

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Pitch the drain tube downward at a slope of at least 1--in. (25 mm)
for every 10 ft (3 m) of horizontal run. Be sure to check the drain

tube for leaks.

TRAP
OUTLET

1-in. (25 mm) min.

2-in. (51 mm) min.

A09052

Fig. 6 -- Condensate Trap

Step 7 — Install Flue Hood

The flue assembly is secured and shipped in the return air duct.
Remove duct cover to locate the assembly (See Fig. 8 and 9).

NOTE

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.

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal

injury or death.
The venting system is designed to ensure proper venting.

The flue hood assembly must be installed as indicted in this

section of the unit installation instructions.

WARNING

Install the flue hood as follows:

1. This installation must conform with local building codes

and with the National Fuel Gas Code (NFGC) NFPA 54 /

ANSI Z223.1,

(in Canada, CAN/CGA B149.1, and

B149.2) 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. 8 and 9). Re-
move the return duct cover to locate the flue hood. Place
flue hood assembly over flue panel. Orient screw holes in

flue hood with holes in the flue panel.

3. Secure flue hood to flue panel by inserting a single screw on

the top flange and the bottom flange 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.
(12.7 mm) FPT gas inlet on the 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. W.C. maximum pressure drop. Never

use pipe smaller than the 1/2--in. (12.7 mm) 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. W.C. or greater than 13 IN. W.C.
while the unit is operating. For propane applications, the gas

pressure must not be less than 11.0 IN. W.C. or greater than 13 IN.
W.C. at the unit connection.
A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gauge

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 NFPA 54/ANSI

Z223.1 latest edition (in Canada, CAN/CGA B149.1).

NOTE

: In the state of Massachusetts:

1. Gas supply connections MUST be performed by a licensed

plumber or gas fitter.

2. When flexible connectors are used, the maximum length

shall not exceed 36 in. (915 mm).

3. When lever handle type manual equipment shutoff valves

are used, they shall be T--handle valves.

4. The use of copper tubing for gas piping is NOT approved

by the state of Massachusetts.

In the absence of local building codes, adhere to the following

pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in.

(6.35 mm) for every 15 ft (4.6 m) of length 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 (1.8
m). For pipe sizes larger than 1/2 in., (12.7 mm) follow

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. 7). This drip leg functions as a trap for dirt and
condensate.

5. Install an accessible, external, manual main shutoff valve in

gas supply pipe within 6 ft (1.8 m) of heating section.

6. Install ground--joint union close to heating section between

unit manual shutoff and external manual main shut--off
valve.

7. Pressure test all gas piping in accordance with local and

national plumbing and gas codes before connecting piping
to unit.

NOTE

: Pressure test the gas supply system after the gas supply

piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig. Pressure test the
gas supply piping system at pressures equal to or less than 0.5 psig.
The unit heating section must be isolated from the gas piping
system by closing the external main manual shutoff valve and
slightly opening the ground--joint union.

674D