b.
Locate the thermopile wires coming from the High Limit box going to the gas valve. The wire insulation size
decreases near the gas valve connections.
c.
Connect the negative (-) test probe to the pilot mounting bracket (ground).
d.
Connect the positive (+) test probe to one of the High Temperature Limit terminal connections. If the reading
is within the specified range remove the test leads, the test in now complete. If the reading is above or below
the specified range continue to step e.
e.
Remove the pilot flame adjustment cover.
Figure 3 Gas Valve Showing Location of the Pressure Regulator and Pilot Adjuster.
f.
Turning the flame adjusting screw clockwise lowers the flame and the millivolt output. Turning the screw
counterclockwise increases flame size and millivolt output.
g.
Rotate the screw in the direction to achieve a reading of 400±50 mV.
NOTE
Allow 3 to 5 minutes between flame adjustments to allow the reading to settle.
h.
Replace the pilot flame adjusting screw cover, remove the test leads, the test is now complete.
Main Burner System (Gas machines only):
For the burners to work the gas supply valve must be open and the Temperature controller must be on. The main
burners receive gas from the main gas supply through the gas valve. When the Temperature controller calls for heat
(and the tank is at the proper water level), the gas valve opens. When the main burners are operating, perform the burner
adjustments in the following procedure. Figure 4 illustrates the different conditions possible for the main burner.
8