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17
Gas Supply Pressures & Regulator Adjustments
WARNING
Should overheating occur or the gas supply fail
to shut off, turn off the manual gas shutoff
valve external to the unit before turning off the
electrical supply.
WARNING
To avoid property damage, personal injury or
death, do not fire gas unit with flue box cover
removed.
NOTE: Except during brief periods when gas
pressures are being measured by qualified
service personnel, the furnace access panel must
always be secured in place when the furnace is in
operation. An inspection port in the access panel is
provided to monitor the flame.
The first step in checking out the gas-fired furnace is to test
the gas supply piping to the unit for tightness and purge the
system of air using methods outlined in the latest edition of
the National Fuel Gas Code ANSI Z223.1 / NFPA 54. Verify
that the disconnect switch is in the “OFF” position. A soapy
water solution should be used to check for gas leaks.
Since the unit is subject to considerable jarring during
shipment, it is extremely important that all gas connections
and joints be tested for tightness. Gas piping downstream
from the unit inlet should be checked for leaks during the
subsequent sequence check.
The supply gas pressure should be adjusted to 7.0” w.c.
on natural gas and 11” to 13.0” w.c. on LP gas with the
gas burners operating. If there is more than one unit on
a common gas line, the pressures should be checked
with all units under full fire. A supply pressure tap is
provided on the upstream side of the gas valve. A manifold
pressure tap is provided on the manifold side of the gas
valve. The normal manifold pressure for High fire is 3.5”
w.c. on natural gas and 10.0” w.c. for propane gas. Low
fire natural gas 2.0” w.c., 6.0” w.c. low fire propane gas.
Minimum gas supply pressure is 5.0” w.c. for natural gas
and 11.0” w.c. for propane gas.
Do not attempt adjustment of the built-in pressure regulator
unless the supply pressure is at least 5.0” w.c. on natural
gas or 11.0” w.c. on propane gas.
FLAME SENSOR
IGNITION ELECTRODE
flame sensor and ignition electrode location
NATURAL GAS
(Dia)
PROPANE (LP)
(Dia)
90,000
4
23,000
43
55
115,000
5
23,000
43
55
140,000
6
23,000
43
55
GAS ORIFICES
MAXIMUM IPPUT
(BTUH)
NUMBER OF
BURNERS
MAXIMUM
BTUH/BURNER
heat exchanger and burner orifice specifications
•
NOTE: Gas appliances located more than 2000 feet
above sea level must be derated 4% per 1000 feet
of total elevation and that variance in gas heating
value and specific gravity require change in manifold
pressure to obtain rating, it is mandatory that the input
be adjusted at the installation site. All installations
should be made as outlined in the latest edition of
the National Fuel Gas Code ANSI Z223.1,section
“Procedures To Be Followed To Place An Appliance
in Operation”. Refer also to the “
User’s Information
Manual
” supplied with the unit for additional
information on the gas furnace.
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the
burners operating must be as specified on the rating plate.
Gas Inlet Pressure Check
Gas inlet pressure must be checked and adjusted in
accordance to the type of fuel being consumed.
With Power And Gas Off:
1.
Connect a manometer to the inlet pressure tap of the
gas valve.
Inlet gas pressure can also be measured by removing the
cap from the dripleg and installing a predrilled cap with a
hose fitting.
With Power And Gas On:
2. Put unit into heating cycle and turn on all other gas
consuming appliances.
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