Alliance Laundry Systems Stacked Drying Tumbler Gas Requirements (continued), Example Of Gas Supply Piping

Installation Instructions

Gas Requirements (continued)

EXAMPLE:Gas Furnace

Gas

Meter

IMPORTANT: Gas loop piping must be installed as illustrated to equalize gas pressure for all tumblers connected to single gas service. Other gas using appliances should be connected upstream from loop.

	Gas
	Water	Gas Space
	Heaters	Gas Space
	Heaters	Heaters
		Heaters
		Tumblers
		Gas Shut-Off
		Valves
		Gas
		Line
		Pressure
		Tap

IMPORTANT: Line pressure must be maintained at 6-1/2 ± 1-1/2 water column inches for Natural Gas (10 ± 1-1/2 water column inches for L.P. Gas)

with all gas appliances running (tumblers, water heaters, space heaters, furnace, etc.).

An in-line pressure regulator may be required on Natural Gas models if the line pressure exceeds eight water column inches pressure with all gas appliances firing.

NOTE: Minimum pipe size to tumbler is 1/2 inch (1.27 cm).

TMB2159N

Figure 8

Example Of Gas Supply Piping

Gas Furnace

(120,000 BTU/HR)

SAMPLE CALCULATIONS:

Equivalent Length = Total length of main gas supply pipe from the gas meter to the far end of the tumbler dryers

	= 25 ft + 19 ft (7.62 meters + 5.79 meters)
	= 44 ft (13.41 meters)
Total BTU/HR	=	The sum of the BTU/HR of all tumblers being
		fed by the main gas supply pipe
	=	18 x 75,000
	=	1,350,000

Using the table in Figure 7, the main supply pipe diameter should be 2-1/2 in (6.35 cm).

Gas Water		Gas Tumbler
		Dryer (75,000
Heaters
	Gas Space Heaters	BTU/HR per
(400,000
	(70,000 BTU/HR	cylinder)
BTU/HR each)
	each)

Gas

Meter

25 ft (7.62 meters)	Pressure	19 ft (5.79 meters)
	Regulator

TMB2160N

Figure 9

M412060