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10.0ADJUSTMENT
10.1PILOT BURNER ADJUSTMENT
Adjust the pilot screw to provide properly sized flame. Turn in a clockwise direction to reduce the gas flow.
Check Pressure Readings:
Inlet pressure can be checked by turning screw (A) counter- clockwise 2 or 3 turns and then placing pressure gauge tubing over the test point. Gauge should read 7” (minimum 4.5”) water column for natural gas or 13” (11” minimum) water column for propane. Check that main burner is operating on “HI”.
A B
FIGURE 10.1 | PILOT SCREW |
Outlet pressure can be checked the same as above using screw (B). Gauge should read 3.5” water column for natural gas or 10” water column for propane. Check that main burner is operating on “HI”.
AFTER TAKING PRESSURE READINGS, BE SURE TO TURN SCREWS CLOCKWISE FIRMLY TO RESEAL. DO NOT OVERTORQUE.
Leak test with a soap and water solution.
10.2 VENTURI ADJUSTMENT
39.4
This model has an air shutter that has been factory set open according to the chart below:
Regardless of venturi orientation, closing the air shutter will cause a more yellow flame, but can lead to carboning. Opening the air shutter will cause a more blue flame, but can cause flame lifting from the burner ports. The flame may not appear yellow immediately; allow 15 to 30 minutes for the final flame color to be established.
AIR SHUTTER ADJUSTMENT MUST ONLY BE DONE BY A QUALIFIED INSTALLER!
VENTURI
BURNER
AIR |
SHUTTER |
OPENING |
ORIFICE 
49.1
| GDS60 |
NG | 3/8” |
LP | 5/16” |
10.3 FLAME CHARACTERISTICS
It’s important to periodically perform a visual check of the pilot and burner flames. Compare them to the illustra- | ||||||
tions provided. If any flames appear abnormal call a service person. |
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3/8” - 1/2” |
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| ELECTRODE | BURNER | FIGURE 10.3b | |||
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| FLAME |
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| SENSOR |
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| FIGURE 10.3a | FLAME MUST ENVELOP | ||||
| UPPER 3/8” TO 1/2” OF | |||||
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| FLAME SENSOR | ||||
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10.4 RESTRICTING VERTICAL VENTS - MODEL GDS60
Vertical installations may display a very active flame. If this appearance is not desirable, the vent exit must be re- stricted using the restrictor vent kit,
