Patterson-Kelley TBIG-03 User Manual

â Twin-Fuel Gas-Fired Boiler 

 

 

 
Natural gas and propane are permanently piped to 
separate connections on the boiler.  Each branch of the 
gas train is fitted with a regulator and a motorized gas 
valve.  The regulators are adjusted to properly fire the 
boiler from their respective sources.  Boiler and con-
trol functions are the same for both fuels.   

In the event of interruption or restriction of the natural 
gas supply, changeover to propane is made manually 

by a selector switch on the boiler (or by a signal from 
a remote switch or controller).    

When the natural gas supply is reestablished, change-
over is made by restoring the selector switch to its 
normal position (or by sending the appropriate signal 
from the remote controller).  

 

 
 
 
 
 

 

 

 
The Gemini™ gas-fired boiler must be: 

·  Installed by qualified personnel in accordance 

with designs prepared by qualified facility engi-
neers including: structural, mechanical, electrical, 
and other applicable disciplines.  

·  Operated and serviced in accordance with a com-

prehensive safety program determined and estab-
lished by the customer and complying with all 
safety provisions of this manual.  Do not attempt 
to operate or service the boiler until such a pro-
gram has been established.  

·  Operated and serviced by qualified, properly 

trained personnel in accordance with all applica-
ble laws and regulations. 

 

 

 

 

 

 

 

 

 

It is essential to read, understand, and follow the rec-
ommendations of this manual before installing, operat-
ing, or servicing this equipment.  Failure to do so could 
result in serious injury, death, and/or property damage. 

 

 

 
Proper training is the best protection against accidents.  
Operating and service personnel must be thoroughly 
familiar with the basic construction of the Gemini™ 
boiler, the use and locations of the controls, the opera-

 
 

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