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manual abstract
2 3.0 SAFETY ...................................................... 2 3.1 General................................................... 2 3.2 Training................................................... 2 3.3 Safety Features....................................... 3 3.4 SafetyLabels.......................................... 3 3.5 Safety Precautions ..................................3 3.5.1 Electrical Hazards ......................................3 3.5.2 Burn, Fire, and Explosion Hazards.............3 3.5.3 Crush Hazards ...........................................4 3.5.4 Chemical Hazards......................................4 4.0 INSTALLATION ..........................................5 4.1 General................................................... 5 4.2 Gas Piping .............................................. 6 4.2.1 Gas Bleeds and Vents................................7 4.3 Pre-Start Check List................................ 7 4.4 Pre-Start Safety Checks and Adjustments 7 4.4.1 Test of Ignition Safety System....................8 4.4.2 Test of Low Water Cutoff ...........................9 4.4.3 Test of High-Limit Control ..........................9 4.4.4 Test of Gas Pressure Switch .....................9 4.4.5 Gas Pressure Adjustment ........................10 4.4.6 Leak Testing of Valves.............................10 5.0 OPERATION............................................. 13 5.1 General.................................................. 13 5.1.1 Tests ........................................................13 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 7.0 MAINTENANCE........................................ 15 7.1 General................................................. 15 7.2 Sequence of Operation......................... 16 8.0 PARTS AND TECHNICAL SUPPORT ...... 17 8.1 Wiring Diagrams................................... 17 8.1.1 Wiring Diagram (Lo-Hi-Lo) .......................18 8.1.2 Control Logic Diagram (Lo-Hi-Lo) ............19 8.1.3 Wiring Diagram (On-Off)..........................20 8.1.4 Control Logic Diagram (On-Off) ...............21 It is essential to read, understand, and follow the recommendations of this manual before installing, operating, or servicing this equipment. Failure to do so could result in serious injury, death, and/or property damage. The information and instructions herein pertain only to equipment supplied by Patterson-Kelley Company. Patterson-Kelley is not responsible for equipment supplied by others, nor for any adverse effects such equipment might have on equipment supplied by Patterson-Kelley. Introduction Warning! This boiler requires VAPORIZED propane or natural gas. Under NO CIRCUMSTANCES may liquid fuel of any kind be introduced in the boiler. natural gas connection and shutoff propane connection and shutoff Figure 1-1 Twin-Fuel Gas Train (Shows 1500/1700/1900 Series; refer to Figure 5-1 for 700/900/1200 Series) 1.0 INTRODUCTION The twin-fuel option for the Patterson-Kelley Gemini ™ 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 twin-fuel operation are factory installed. This document is a companion to the “Installation and Owner’s Manual - TBIG” for the standard Thermific. boiler. Both documents must be used together. This companion document describes those safety, installation, adjustment, and maintenance procedures which differ from the single-fuel model. Information which applies to both models is found in the main manual. - 1 - Gemini Twin-Fuel Gas-Fired Boiler 2.0 DESCRIPTION 2.1 PRINCIPLE OF OPERATION 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 control 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, changeover is made by restoring the selector switch to its normal position (or by sending the appropriate signal from the remote controller). 3.0 SAFETY 3.1 GENERAL 3.2 TRAINING The Gemini™ gas-fired boiler must be: . Installed by qualified personnel in accordance with designs prepared by qualified facility engineers including: structural, mechanical, electrical, and other applicable disciplines. . Operated and serviced in accordance with a comprehensive safety program determined and est...