17
Operations
Gas Pressure:
The ideal incoming gas pressure is 11 w.c.i (water
column inches). Minimum is 9 w.c.i., maximum is 14
w.c.i. or 1/2 PSIG. The correct operating manifold
pressure for natural gas is 2.8 w.c.i. The operating
manifold pressure for propane gas is 7.5 w.c.i. By
adjusting the gas valve pressure regulator between 3
and 4 w.c.i. a side range can be achieved for natural
gas.
If the desired input rating cannot be obtained within the
above manifold pressure adjusting range, then the next
size larger or smaller burner orifice should be used.
The gas pressure coming out of the regulator and going
to the burner ring has been factory set for elevations of
0 to 2000 ft. Altitudes greater than 2000 ft will require
adjustments to the gas manifold pressures. Consult
your local service dealer for high altitude adjustments.
In Canada, certification for installation at altitudes over
4500 feet above sea level is the jurisdiction of local
authorities. You should not readjust the burner ring gas
pressure. If you replace your gas valve, you will need to
adjust the new valve. Refer to your machine’s specifi-
cation plate for the correct pressure setting. Follow the
installation and adjustment instructions provided with
your replacement valve.
NOTE: Air for combustion and ventilation along with
exhaust flue sizing must conform to methods outlined in
current American Standard (ANSI-Z223.1) National
Fuel Gas Code or National Standard of Canada CSA-
149.1 and CSA-149.2 “Installation Code for Gas
Burning Appliances”.
Hotsy 900/1400 Operator’s Manual 9.803-325.0 - C
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