Conversions; Checking The Inlet Gas Pressure - Napoleon 9700 SERIES Installation And Operating Instructions Manual

38
13.0

CONVERSIONS

HIGH ALTITUDE: In Canada, the modifi cations for high altitude are based on a 10% reduction of input
capacity for elevations from 2000 - 4500 feet.
In the United States, the modifi cations for high altitude are based on a 4% reduction of input capacity for every
1000 feet above 2000 feet above sea level. Table 6 illustrates the impact of altitude for selected elevations.
Consult with local fuel suppliers or authorities to determine local regulations or customs.
FIGURE 29 - INSHOT BURNER ASSEMBLY

13.1 CHECKING THE INLET GAS PRESSURE

WHITE-RODGERS TWO STAGE GAS VALVE
1. Turn off the gas and electrical supply.
2. Back inlet pressure test screw (inlet pressure boss, see FIGURE 31) counterclockwise out one turn
maximum, with a 3/32" Allen wrench. Attach a hose and calibrated U-tube or digital manometer to the inlet
pressure boss. Hose should overlap boss 3/8". The manometer must have a scale range of at least 0" to
15" of water column.
3. Turn ON the gas and electrical supply and operate the furnace and all other gas consuming appliances on
the same gas supply line. Using a soap and water solution, check for leaks around the gas valve/manifold
connection and the burner orifi ces. Repair any leaks before continuing.
4. Measure furnace gas inlet pressure with burners fi ring. Inlet pressure must be within the range specifi ed on
the furnace rating plate. 5-7" w.c. (Natural Gas).
If the inlet pressure differs from the rating plate, make the necessary adjustments to pressure regulator,
gas piping size, etc. and/or consult with local gas utility.
5. Turn off gas and electrical supply to furnace, remove the manometer hose from the inlet pressure tap boss,
and tighten the inlet pressure tap screw using the 3/32" Allen wrench. (Clockwise, 7 in-lb minimum).
6. Turn on the gas supply and electrical power to the furnace.
7. Using a leak detection solution or soap suds, check for leaks at pressure boss screw. Bubbles forming
indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY!
8. Turn gas back on and test inlet pressure boss with leak detector.
W415-1064 / 11.11.11
TABLE 6 - HIGH ALTITUDE SPECIFICATIONS (U.S.A.)
ALTITUDE
MODEL
(FT)
0-2000
2000-3000
3000-4000
4000-5000
60/80
5000-6000
100/120
6000-7000
7000-8000
8000-9000
9000-10000
† Gas input ratings are certifi ed for elevations to 2000 ft. For elevations above
2000 ft, reduce ratings 4% for each 1000 ft above sea level.
ORIFICE SIZE (DMS)
NATURAL
45
48
49
50
51
52
53
54
55