beautypg.com

A caution, A warning – Carrier WEATHERMAKER 8000 58WAV User Manual

Page 6

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

background image

3. Install another nut on other side of furnace base. (Install flat

washer if desired.)

4. Adjust outside nut to provide desired height, and tighten inside

nut to secure arrangement.

A89014

Fig. 6—Leveling Leg Installation

Step 5—Gas Piping

Gas piping must be installed in accordance with national and local

codes. Refer to the current edition of the NFGC. Canadian

installations must be installed in accordance with NSCNGPIC and

all authorities having jurisdiction.
The gas supply line should be a separate line running directly from

the gas meter to the furnace, if possible. Refer to Table 4 for the

recommended gas pipe size. Risers must be used to connect to the

furnace and the meter.

A CAUTION

If a flexible connector is required or allowed by the authority

having jurisdiction, black iron pipe shall be installed at the

gas valve and extend a minimum of 2 in. outside the furnace

casing.

Piping should be pressure-tested in accordance with local and

national plumbing and gas codes before the furnace has been

attached. If the pressure exceeds 0.5 psig (14-in. wc), the gas

supply pipe must be disconnected from the furnace and capped

before the pressure test. If the test pressure is equal to or less than

0.5 psig (14-in. wc), close the manual shut-off valve located on the

gas valve before the test. It is recommended that the ground joint

union be loosened before pressure testing. After all connections

have been made, purge the lines and check for leakage with

regulated gas supply pressure.
Install a sediment trap in the riser leading to the furnace. The trap

can be installed by connecting a tee to the riser leading from the

furnace. Connect a capped nipple into the lower end of the tee. The

capped nipple should extend below the level of the gas controls.

(See Fig. 7.)

Fig. 7—Typical Gas Pipe Arrangement

Apply joint compound (pipe dope) sparingly and only to the male

threads of each joint. The compound must be resistant to the action

of propane gas.
Install an accessible manual shut-off valve upstream of the furnace

gas controls and within 72 in. of the furnace. A 1/8-in. NPT

plugged tapping, accessible for test gage connection, must be

installed immediately upstream of the gas supply connection to the

furnace and downstream of the manual shut-off valve. Place

ground joint union between the gas control manifold and the

manual shut-off valve.

A

WARNING

Use the proper length of pipes to avoid stress on the gas

control manifold. Failure to follow this warning can cause a

gas leak resulting in fire, explosion, personal injury, or death.

A

CAUTION

Use a backup wrench when connecting the gas pipe to the

furnace to avoid damaging gas controls.

Table 4—Maximum Capacity of Pipe*

NOMINAL

IRON PIPE

SIZE (IN.)

INTERNAL

DIAMETER

(IN.)

LENGTH OF PIPE (FT)

10

20

30

40

50

1/2

0.622

175

120

97

82

73

3/4

0.824

360

250

200

170

151

1

1.049

680

465

375

320

285

1-1/4

1.380

1400

950

770

660

>580

1-1/2

1.610

2100

1460

1180

990

900

‘Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a pressure drop of 0,5-in. wc (based on a 0.60 specific gravity gas).

6