![4.4.5Gas Pressure Adjustment](/images/new-backgrounds/46330/4633023x1.webp)
Gemini™
4.4.5Gas Pressure Adjustment
Increase Decrease
Figure
The gas pressure is set initially during a factory fire- test. A final adjustment must be made after the boiler has been installed, as follows:
See rating plate for the minimum and maximum gas pressure of the boiler.
Each boiler is furnished with three plugged taps in the gas train for test gauge connections. Two taps are lo- cated at the natural gas and propane manual shutoff valves and are for measuring the gas supply pressure (1/4" I.P.S.). The supply pressure during main burner operation must be greater than the minimum indicated on the rating plate (6 inches W.C. for natural gas, 6 inches W.C. for propane). The remaining tap is lo- cated downstream from the secondary manual shutoff valve at the elbow where the gas line enters the back of the cabinet and is for measuring the manifold gas pressure (1/8" I.P.S.).
If a replacement
To adjust gas pressure, first connect an appropriate
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"Rating Plate," affixed to the back of the cabinet, is provided only as a guide to the proper setting. The manifold gas pressure indicated on the "Factory Fire- test" label (affixed to the back of the cabinet) should be used to achieve the proper firing rate of the individual boiler as installed. Replace seal cap after adjustment.
4.4.6 Leak Testing of Valves
Annually test for
motorized gas | secondary | |
motorized | ||
valve (natural | ||
gas valve | ||
gas) | ||
| ||
| secondary | |
| shutoff | |
| to burner |
downstream leak test valve
upstream leak test valve
motorized gas valve (propane)
Figure
Each branch of the gas train must be tested separately, as follows:
1.Open the natural gas connection manual shutoff. Close the propane connection manual shutoff. (Refer to Figure
2.Close the secondary shutoff (downstream of all motorized valves).
3.Attach a short piece of hose to the downstream