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record adjusted manifold pressure, altitude of the unit
installation and the technician's name and date on the
label using a permanent marker.
Table 10. High altitude deration - United States
Altitude
Feet
0-2,000
2,001-3,000
3,001-4,000
4,001-5,000
5,001-6,000
6,001-7,000
7,001-8,000
8,001-9,000
9,001-10,000
Notes:
1. Deration based on ANSI Z223.1 (NFPA 54).
2. Table based on heating value of 1,050 BTU/Cu. ft. at sea level.
3. Table based on heating value of 2,500 BTU/Cu. ft. at sea level.
4. Consult local utility for actual heating value.
Table 11. High altitude deration - Canada
Altitude
Feet
0-2,000
2,001-3,000
3,001-4,000
4,001-4,500
Notes:
1. Deration based on CGA 2.17-M91
2. Table based on heating value of 1,050 BTU/Cu. ft. at sea level.
3. Table based on heating value of 2,500 BTU/Cu. ft. at sea level.
4. Consult local utility for actual heating value.
Table 12. Separated combustion tubular blower troubleshooting guide
SYMPTOMS
A. Flame pops back.
B. Noisy Flame.
C. Yellow tip flame (some yellow tipping on LP
gas is permissible).
GKNE-SVX001B-EN
Natural Gas
Inches
Meters
W.C.
0-610
3.5
611-915
3.2
916-1,220
2.9
1,221-1,525
2.7
1,526-1,830
2.4
1,831-2,135
2.2
2,136-2,440
2
2,441-2,745
1.8
2,746-3,045
1.6
Natural Gas
Inches
Meters
W.C.
0-610
3.5
611-915
3.2
916-1,220
2.9
1,221-1,371
2.8
POSSIBLE CAUSE(S)
1. Burner orifice too small.
1. Irregular orifice causing whistle or
resonance.
2. Excessive gas input.
1 Clogged main burners.
2. Misaligned orifices.
3. Insufficient combustion air.
4. Possibly over fired.
Refer to Installation Instruction section on Adjustments-
Gas Input Rate for adjusting the manifold pressure.
Manifold Pressure
2
Liquid Propane
Inches
Pa
W.C.
872
10
797
9.2
722
8.4
673
7.7
598
7
548
6.4
498
5.7
448
5.1
399
4.6
Manifold Pressure
2
Liquid Propane
Inches
Pa
W.C.
872
10
797
9.2
722
8.4
697
7.9
1. Check with local gas supplier for proper orifice
size and replace. Refer to "Gas Input Rate."
1. Replace orifice.
2. Test and reset manifold pressure (see Table 4 -
"Gas Piping Requirements").
1. Clean main burner ports.
2. Replace manifold assembly.
3. Refer to "Installation - Clearances" and
"Venting" to ensure unit is properly mounted
and vented.
4. Check gas input and manifold pressures.
Gas Input Rate
3
BTU Output
Pa
Percent
2,491
100%
2,292
96%
2,092
92%
1,918
88%
1,744
84%
1,594
80%
1,420
76%
1,270
72%
1,145
68%
3
BTU Output
Pa
Percent
2,491
100%
2,292
96%
2,092
92%
1,968
90%
CORRECTIVE ACTION
1
1
31
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