background image

  Gemini

â

 Twin-Fuel Gas-Fired Boiler 

 

 

 

2.0  D

ESCRIPTION 

 

 

2.1  P

RINCIPLE OF 

O

PERATION

 

 
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).  

 

 
 
 
 
 

 

 

3.0  S

AFETY

 

 

3.1  G

ENERAL

 

 
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. 

3.2  T

RAINING

 

 

 

 

 

 

 

 

 

 

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-

 
 

- 2 - 

 

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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