Page 43
Gas manifold pressure within
range shown in table 18?
Check the following
1-Does the unit have the correct
air orifice size? See table 19.
2 -Is the orifice fully seated tight
against the elbow ?
3
way?
4 - Is the air inlet screen clear of
any obstruction ?
Correct any problems found.
Is ignition or resonance issue
resolved ?
Check Air Orifice
See Figure 55.
Troubleshooting is complete
Check Gas Manifold Pressure
Replace air orifice.
see table 3.
Check signal Pressure
Signal pressure within
range shown in table 18?
Replace gas valve
Check the following
1-. Vent /air intake pipe restriction.
2- Plugged drain
3- Plugged air inlet screen
4 - Signal hoses to gas valve
for kinks, loose fit or plugging.
Correct any problems found.
Manifold pressure correct ?
Replace gas valve
No
Yes
Is ignition or resonance
issue resolved?
Yes
Troubleshooting is complete
No
Replace air orifice.
see table 19.
No
No
Yes
Troubleshooting Poor Ignition or Combustion Resonance Issues
No
Yes
Yes
FIGURE 57
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