Alliance Laundry Systems Stacked Drying Tumbler - Manual (Page 23)

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Installation Instructions
21 M412060
Gas Requirements (continued)
Example Of Gas Supply Piping
Figure 8
Figure 9
Gas
Furnace
Gas
Water
Heaters
Gas Space
Heaters
Gas
Meter
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).
Tumblers
Gas
Line
Pressure
Tap
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. EXAMPLE:
Gas Shut-Off
Valves
TMB2159N
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 Furnace
(120,000 BTU/HR)
Gas Water
Heaters
(400,000
BTU/HR each)
Gas Tumbler
Dryer (75,000
BTU/HR per
cylinder)
Gas
Meter
25 ft (7.62 meters)
Pressure
Regulator
19 ft (5.79 meters)
Gas Space Heaters
(70,000 BTU/HR
each)
TMB2160N