Carrier 58TMA → -Horizontal Installation on Blocks, Furnace Casing Width Filters

A95235

→ Fig. 10—Horizontal Installation on Blocks

AIRFLOW

12″

4″ D

FIELD-SUPPLIED￿

FILTER RETAINERS

Fig. 11—Horizontal Filter Arrangement

Table 4—Filter Retainer (In.)

FURNACE CASING WIDTH	FILTERS	D
14-3/16	(2) 14 X 20 X 1	14-3/8
17-1/2	(2) 14 X 20 X 1	13-3/8
21	(2) 16 X 20 X 1	11-5/8
24-1/2	(2) 16 X 20 X 1	10-1/4

If flexible connector is required or allowed by authority having jurisdiction, black iron pipe shall be installed at gas valve and extend a minimum of 2 in. outside furnace casing.

Use the proper length of pipes to avoid stress on gas control manifold. A failure to follow this warning could result in a gas leak causing fire, explosion, personal injury, or death.

Use a backup wrench at furnace gas control when connecting gas pipe to furnace to avoid damaging gas controls or manifold.

Never purge a line into a combustion chamber. Never use matches, candles, flame, or other sources of ignition to check for gas leakage. Use a soap-and-water solution to check for gas leaks. A failure to follow this warning could result in fire, explosion, personal injury, or death.

Joint compounds (pipe dope) should be applied sparingly and only to male threads of joints. This pipe dope must be resistant to action of propane gas.

AIRFLOW

INSTALLATION￿

POSITION￿

OF FILTERS

RETURN-AIR￿

PLENUM

ACCESS DOOR

Fig. 12—Downflow Filter Arrangement A88486

Table 5—Maximum Capacity of Pipe*

NOMINAL	INTERNAL		LENGTH OF PIPE (FT)
IRON PIPE	DIAMETER
		10		20	30	40	50
SIZE (IN.)	(IN.)
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 supply line pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table 10-2, NFPA 54-1996.

Install accessible manual shutoff valve upstream of furnace gas controls and within 72 in. of furnace. A 1/8-in. NPT plugged tapping is provided on gas value for test gage connection. Installation of additional 1/8-in. NPT plugged tapping, accessible for test gage connection, installed immediately upstream of gas supply connection to furnace and downstream of manual shutoff valve is not required. Place ground joint union between gas control manifold and manual shutoff.

Install sediment trap in riser leading to furnace. The trap can be installed by connecting a tee to riser leading from furnace. Connect capped nipple into lower end of tee. The capped nipple should extend below level of gas controls. (See Fig. 13.)

Piping should be pressure tested in accordance with local and national plumbing and gas codes before furnace has been attached. If test pressure exceeds 0.5 psig (14-in. wc), the gas supply pipe must be disconnected from furnace and capped before pressure test. If test pressure is equal to or less than 0.5 psig (14-in. wc), turn off electric shutoff switch located on the gas valve before test. (See Fig. 13.) It is recommended that ground joint union be loosened before pressure testing.

After all connections have been made, purge lines and check for gas leakage with regulated gas supply pressure.

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