Operating instructions

- BURNER J
ORIFICE
A93059
Fig. 58--Orifice Holes
g. Look through sight glass in burner enclosure and check
burner flame. Burner flame should be clear blue, almost
transparent. (See Fig. 59.)
h. Remove jumper from R and W.
3. Verify natural gas input rate by clocking gas meter.
NOTE: Be sure all pressure tubing, combustion-air and vent
pipes, and burner box cover front are in place when checking input
by clocking gas meter.
EXAMPLE:
100,000 Btuh input furnace installed at 4300 ft.
Derate Furnace Input Rate
Furnace Input Rate X Multiplier at Installation
at Sea Level Factor Altitude
100,000 X 0.91 91,000
a. Calculate high-altitude adjustment (if required).
UNITED STATES
At altitudes above 2000 ft, this furnace has been approved
for a 2 percent derate for each 1000 f't above sea level. See
Table 11 for derate nmltiplier factor.
BURNER FLAME "_
f- BURNER
MANIFOLD J
A89020
Fig. 59--Burner Flame
CANADA
At installation altitudes between 2001 to 4500 It, this
furnace must be derated 5 percent by an authorized Gas
Conversion Station or Dealer. To determine correct input
rate for altitude, see example above and use 0.95 as derate
nmltiplier factor.
Table 11-Altitude Derate Multipler for U.S.A.
ALTITUDE PERCENT
(FT) OF DERATE
0-2000 0
2001-3000 4-6
3001-4000 6-8
4001-5000 8-10
5001-6000 10-I2
6001-7000 12-14
7001-8000 14-16
8001-9000 16-18
9001-10,000 18-20
* Derate multiplier factors are based on midpoint altitude
DERATE MULTIPLIER
FACTOR*
1.00
0.95
0.93
0.91
0.89
0.87
0.85
0.83
0.81
for altitude range
b. Reinstall burner box cover.
c. Gas valve regulator seal cap MUST be on.
d. Turn off all other gas applications and pilots.
e. Start furnace and let operate for 3 minutes.
f. Measure time (in sec) for gas meter to dial to complete 1
revolution.
g. Refer to Table 12 for cuft of gas per hr.
h. Multiply gas rate (cu ft&r) X heating value (Btuicu ft)
using natural gas heating value fi'om local gas
utility supplier.
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