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DIAPHRAGM INSTALLATION AND COMBUSTION HEAD SETTING
A proper diaphragm (C) has to be installed in the combustion head gas line, according to TABLE 1. A complete set of gas
diaphragms is delivered with the burner packaging as equipment. The burner leaves the factory with the A7 diaphragm
already installed. In case another diaphragm has to be installed, following the instructions below.
To remove the drawer assembly from the manifold (B), follow the procedure below:
1) Disconnect 24v leads at the gas valve.
2) Separate the burner chassis from the combustion head by removing the locknut.
3) Loosen the two Allen screws (A) without taking them out.
4) Withdraw the head, turning it 180 degrees.
5) Pull out head, leaning it towards the bottom.
6) Remove the ignition electrode (D) and the ionization probe (E).
7) Unscrew the screw (F) and remove the gas diffuser (G).
8) Install the proper diaphragm (C) and seal according to TABLE 1.
9) Refit following the above procedure in the reverse order (verify the ignition electrode and the ionization probe positions
according to page 5).
Slide the elbow (B) so that the number on the indicator scale aligns with the back edge of the air tube.
See TABLE 1 for set points. Tighten the two Allen screws (A).
Example (for natural gas):
For a desired burner output of 93,000 Btu/hr, the diaphragm would be A5 and the combustion head setting would be 2.0.
All settings in TABLE 1 are obtained with zero (0) pressure in the combustion zone and at normal operating tempera-
tures. i.e.; steady state hot conditions.
Note: Burner must be fired ONLY with fuel that is listed on the burner serial label.
MANIFOLD PRESSURES
Manifold gas pressure for various firing rates should be set by adjusting the gas regulator of the gas valve, (see figure
at page 6). To check manifold gas pressure, attach a manometer to the manifold test point, shown on typical gas train
layout. Approximate manifold pressure settings are indicated in TABLE 1.
Example (for natural gas):
For a burner to be fired at 93,000 Btu/hr, the manifold pressure would be approximately 3.5" wc.
In case of lower or higher manifold pressure, install an diaphragm with a respectively smaller or bigger hole.
All settings in TABLE 1 are obtained with zero (0) pressure in the combustion zone and at normal operating tempera-
tures. i.e.; steady state hot conditions.
Note: Burner must be fired ONLY with fuel that is listed on the burner serial label.
HIGH ALTITUDE SETTINGS
It should be noted that for higher altitudes more air for combustion is required.
All settings in this manual have been obtained at approximately sea level. Special attention should be paid to air for
combustion for elevations above sea level. If an increase in combustion air is insufficient, the burner must then be de-
rated by approximately 4% for every 1000 feet above sea level.
2903332
D
B
A
12
E
F
GB
G
D7349
C
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