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  Gemini™ Twin-Fuel Gas-Fired Boiler 

 

lines for gas devices.  See Section 4 below. 

· 

Hazard from incorrect fuels!  Possible fire, explo-
sion, overheating, and damage.  Do not use any 
fuels except 

vaporized

 natural gas and propane.  

Under no circumstances is liquid fuel of any kind 
to be introduced in the boiler.  

· 

Hazard from incorrect fuel connections!  Possible 
fire, explosion, overheating, and damage.  Do not 
attempt to connect the propane supply to the natu-
ral gas connection, or vice versa.   

· 

Fire and explosion hazards!  Close both the natural 
gas and propane shutoffs before servicing boiler.  

· 

Burn hazard!  Possible hot surfaces.  Do not touch 
gas vent during firing operation.  Use only factory 
recommended B-vent components.   

· 

Fire and explosion hazards!  Use caution when 
servicing burner.  Propane is heavier than air and 
may linger in the combustion chamber, vent lines, 
or elsewhere.  

· 

Gas leak hazard!  Make sure all connections to 
main burner are tight when reassembling the 
burner.  These connections 

cannot

 be tested after 

burner is assembled.   

· 

Gas leak hazard!  Test motorized gas valves annu-
ally for leakage as described in Section 4.4.6. 

· 

Gas leak hazard!  All threaded gas connections 
must be made using a pipe compound that is resis-
tant to propane.  

Do not

 use Teflon

ä

 tape on 

threaded gas piping.   

· 

Gas leak hazard!  Check entire gas train for leaks 
after installation.  If there is a smell of gas, shut 
down the boiler and obtain immediate assistance 
from trained service personnel and/or your local 
fire department.    

· 

Overfire hazard!  Possible fire and explosion from 
excess gas pressure.  Make sure that gas inlet pres-
sure does not exceed 14 inches W.C. to the 
regulator on either the natural gas or propane sup-
ply line.  

· 

Overfire hazard!  Possible fire and explosion.    
Possible malfunction of regulators and/or motorized 
gas valves.  Maintain all gas train components in 

good condition.  Do not alter wiring connections.  
Annual inspection by factory-trained personnel for 
proper set-up and operation is recommended.  

· 

Overfire and underfire hazards!  Possible fire, ex-
plosion, overheating, and component failure.  Do 
not attempt to adjust firing rate of the boiler. The 
firing rate must be adjusted 

only

 by factory 

trained personnel.   

 
 

3

 

.5.3  Crush Hazards 

General Warning

 

 

· 

Lifting hazards!  Use properly rated lifting equip-
ment to lift and position the boiler.  The load is 
unbalanced.  Test balance before lifting 3 ft. 
above the floor.  Do not allow personnel beneath 
the lifted load.  Refer to approximate weights in 
the table below:  

 

Boiler Size 

Weight in Pounds 

   700,000 Btu 

650 

1,000,000 Btu  

650 

1,200,000 Btu 

765 

1,500,000 Btu 

1,100 

1,700,000 Btu 

1,100 

2,000,000 Btu 

1,100 

 
 
3

 

.5.4  Chemical Hazards 

 

 

· 

Environmental hazard!  The motorized gas valves 
may contain hydraulic oil.  Use safe procedures 
for the disposal of all lubricants.   

 
 

- 4 - 

 

Summary of Contents for TBIG-03

Page 1: ...ER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S MANUAL INSTALLATION OWNER S...

Page 2: ...5 1 2 Starting System 13 5 2 Lighting and Shut Down Procedures 13 5 2 1 Lighting Procedures 13 5 2 2 Normal Shut Down Procedures 14 5 2 3 Emergency Shut Down 14 5 3 Switchover to Propane Operation 14...

Page 3: ...gas fired boiler allows the boiler to be fired by propane in the event that the supply of natural gas is temporarily interrupted or restricted The necessary fittings valves piping and controls for twi...

Page 4: ...r 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...

Page 5: ...ime Con tact Patterson Kelley at 570 421 7500 for replace ment labels 3 5 SAFETY PRECAUTIONS Provide a suitable location for the boiler away from normal personnel traffic with adequate working space a...

Page 6: ...Check entire gas train for leaks after installation If there is a smell of gas shut down the boiler and obtain immediate assistance from trained service personnel and or your local fire department Ov...

Page 7: ...t valves n o vent valve I R I only Figure 4 1 Piping Schematic for the Twin Fuel Gas Train 4 0 INSTALLATION Gas Train Connection Sizes Natural Gas Propane 700 1000 1200 Series 1 1 4 1 1500 1700 2000 S...

Page 8: ...n either the natural gas or propane supply a suitable intermediate gas pressure regulator of the lock up type must be provided to reduce the pressure to less than 14 inches W C All boilers are designe...

Page 9: ...d devices as shown above 4 3 PRE START CHECK LIST Before firing the boiler make sure the following items have been completed 1 Flue gas from the boiler is properly vented 2 Gas connections have been m...

Page 10: ...block on the control panel Disconnect ing this wire disables the main gas valve ensuring that gas cannot flow during the test 2 Turn on the circulating water pump With the natural gas shutoff and sec...

Page 11: ...rating turn down the temperature setting on the high limit thermostat until the main burner shuts off The high limit switch must be reset manually after testing This check should also be made for the...

Page 12: ...be performed by qualified service per sonnel To adjust gas pressure first connect an appropriate pressure sensing device at the manifold tap then re move seal cap from regulator Turn adjusting screw c...

Page 13: ...is OK If there are bubbles replace the valve 5 Attach the hose to the upstream leak test valve 6 Open the upstream leak test valve and check for bubbles in the hose If there are no bubbles the natural...

Page 14: ...anical link to air control auxiliary panel service power shutoff switch inside auxiliary panel service power shutoff switch inside propane low pressure switch pressure tap secondary shutoff high gas p...

Page 15: ...been under water Immediately call a qualified service technician to in spect the boiler and to replace any part of the control system and any gas control which has been under wa ter 5 2 LIGHTING AND...

Page 16: ...the gas supplies remote from the boiler 5 3 SWITCHOVER TO PROPANE OPERATION Switchover from natural gas to propane is made manually as follows 1 Turn the fuel selector switch located on the main contr...

Page 17: ...y Figure 7 1 Piping Schematic for the Twin Fuel Gas Train 7 0 MAINTENANCE 7 1 GENERAL Warning High voltage Shock hazard Properly lock out tagout the electrical service and all other energy sources bef...

Page 18: ...or marked Heat 6 The programmer first energizes Terminal 4 which supplies power to the contactor for the blower mo tor and the air flow switch which initially shows low air flow with the LowAir indica...

Page 19: ...operating control switch will close again The operating sequence will re cycle to step 5 provided that the limits on water flow gas pressure and high temperature are all met 8 0 PARTS AND TECHNICAL S...

Page 20: ...Gemini Twin Fuel Gas Fired Boiler 8 1 1 Wiring Diagram Lo Hi Lo 18...

Page 21: ...Parts and Technical Support 8 1 2 Control Logic Diagram Lo Hi Lo 19...

Page 22: ...Gemini Twin Fuel Gas Fired Boiler 8 1 3 Wiring Diagram On Off 20...

Page 23: ...Parts and Technical Support 8 1 4 Control Logic Diagram On Off 21...

Page 24: ......

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