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GGIG-99
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
&
MANUAL
INSTALLATION
OWNER’S
&
MANUAL
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Gemini™ Twin-Fuel Gas-Fired Boiler TABLE OF CONTENTS 4.4.4 Test of Gas Pressure Switch .....................9 1.0 INTRODUCTION .........................................1 4.4.5 Gas Pressure Adjustment ........................10 2.0 DESCRIPTION............................................2 4.4.6 Leak Testing of Valves.............................10 2.1 Principle of Operation..............................2 5.0 OPERATION............................................. 13 3.0 SAFET
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Introduction Warning! This boiler requires VAPORIZED propane or natural gas. Under NO CIRCUMSTANCES may liquid fuel of any kind be introduced in the boiler. propane connection and shutoff natural gas 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 Gem- Owner’s Manual - TBIG” for the standard Thermific ini™ gas-
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Gemini Twin-Fuel Gas-Fired Boiler 2.0 DESCRIPTION 2.1 PRINCIPLE OF OPERATION by a selector switch on the boiler (or by a signal from a remote switch or controller). Natural gas and propane are permanently piped to When the natural gas supply is reestablished, change- separate connections on the boiler. Each branch of the over is made by restoring the selector switch to its gas train is fitted with a regulator and a motorized gas normal position (or by sending the appr
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Safety tion of the boiler, adjustment of its various mecha- 3.5 SAFETY PRECAUTIONS nisms, and all applicable safety precautions. If any of Provide a suitable location for the boiler, away from the provisions of this manual are not fully and com- normal personnel traffic, with adequate working space, pletely understood, contact the Patterson-Kelley Sales adequate clearances, proper ventilation and lighting, Department at (570) 421-7500 for assistance. with a structure sufficien
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Gemini™ Twin-Fuel Gas-Fired Boiler lines for gas devices. See Section 4 below. good condition. Do not alter wiring connections. Annual inspection by factory-trained personnel for Hazard from incorrect fuels! Possible fire, explo- proper set-up and operation is recommended. sion, overheating, and damage. Do not use any fuels except vaporized natural gas and propane. Overfire and underfire hazards! Possible fire, ex- Under no circumstances is liquid fuel of any kind plosion,
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Installation pilot regulator and solenoid valve motorized gas valve mechanical link (natural gas) to control air (Lo-Hi-Lo only) regulator * burner pilot shutoff natural gas connection pressure tap manual shutoff secondary low gas shutoff, manual leak test pressure switch * valves high gas pressure switch propane * motorized gas valve connection manual n.o. vent valve shutoff (I.R.I. only) Items with symbol must be regulator * * vented to outside. Refer to the motorized gas val
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Gemini™ Twin-Fuel Gas-Fired Boiler Gas Pressure Adjustment natural gas supply Test of Motorized Gas Valves remote gas shutoff union (not supplied) 4.2 GAS PIPING Before making the gas hook-up, make sure the boiler shutoff meter drip leg (on boiler) is being supplied only with the fuels shown on the boiler nameplate. The boiler is designed to operate on vaporized natural gas and propane only. Do not use any type of liquid fuel. Do not attempt to fuel the propane shutoff
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Installation shutoff valves (located at the end of the supplied gas 4.3 PRE-START CHECK LIST train) from the gas and propane supply systems during Before firing the boiler make sure the following items any pressure testing of the system at pressures in ex- have been completed. cess of 1/2 psig (14 inches W.C.). 1. Flue gas from the boiler is properly vented. During any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 psig (14 2. Gas conn
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Gemini™ Twin-Fuel Gas-Fired Boiler high limit temperature propane in-use adjustment indicator and operating temperature fuel selector switch adjustment (on side) service power shutoff switch Figure 4-4 Service Power Shutoff Switch (located inside the auxiliary panel at the back of the boiler) high limit flame control "on"/"off" reset reset switch switch Figure 4-5a On-Off Control Panel (faceplate opened) The boiler is provided with an ignition safety system. General W
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Installation surance or local codes require, go to a "lockout” 4.4.4 Test of Gas Pressure Switch mode. Lockout will require manual reset of the flame safeguard. Reset 4. After completing this test, turn off the boiler and reconnect the wire to the main gas valve. Replace the control panel faceplate. 4.4.2 Test of Low Water Cutoff The boiler is furnished with a flow-switch-type low water cutoff in the outlet nozzle. 1. Make sure the boiler is off. 2. Turn the
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Gemini™ Twin-Fuel Gas-Fired Boiler 4.4.5 Gas Pressure Adjustment "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 Increase Decrease 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 by-pass lea
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Installation leak test valve. (Refer to Figure 4-8 above.) In- 6. Open the upstream leak test valve and check for sert the free end of the hose in a cup of water. bubbles in the hose. If there are no bubbles the natural gas motorized gas valve is OK. If there 4. Open the downstream leak test valve and check are bubbles, replace the valve. for bubbles in the hose. If there are no bubbles the secondary motorized gas valve is OK. If there are To test the propane branch of the gas
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Gemini™ Twin-Fuel Gas-Fired Boiler mechanical link auxiliary panel to air control (service power shutoff switch inside) main gas valve pressure tap water high gas pressure connection switch low pressure secondary switches shutoff (visible from side) propane connection (1 1/4") and shutoff propane gas valve pilot gas supply natural gas connection (2") propane regulator and shutoff natural gas natural gas regulator gas valve auxiliary panel (service power shutoff switch inside) prop
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Operation 5.0 OPERATION 5.1 GENERAL 5.2 LIGHTING AND SHUT-DOWN PROCEDURES The basic operation and control functions of the Gem- 5.2.1 Lighting Procedures ini™ twin-fuel gas boiler are similar to the single-fuel models. high limit/operating fuel propane high limit temperature selector in-use reset adjustments switch indicator 5.1.1 Tests Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on this boiler when
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Gemini™ Twin-Fuel Gas-Fired Boiler 1. Close main (natural gas and propane) and pilot 5.3 SWITCHOVER TO PROPANE OPERATION shutoffs. Switchover from natural gas to propane is made 2. Turn the On/Off switch to "OFF" position. manually, as follows: 3. Wait 5 minutes. 1. Turn the fuel selector switch located on the main control panel from natural gas to propane. 4. Open main (natural gas and propane) and pilot shutoffs. The boiler will go through a complete shutdown and restart
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Maintenance pilot regulator and solenoid valve motorized gas valve mechanical link (natural gas) to control air (Lo-Hi-Lo only) regulator * burner pilot shutoff natural gas connection pressure tap manual shutoff secondary low gas shutoff, manual leak test pressure switch * valves high gas pressure switch propane * motorized gas valve connection manual n.o. vent valve shutoff (I.R.I. only) Items with symbol must be regulator * * vented to outside. Refer to the motorized gas valv
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Gemini™ Twin-Fuel Gas-Fired Boiler In the case of the twin-fuel boiler, the phrase “main tor and the air flow switch, which initially shows gas cock” or “main gas valve” as used in the “Installa- low air flow with the "LowAir" indicator. This tion and Owner’s Manual” applies to the manual shut- indicator will remain on until sufficient air flow is sensed. offs for both the natural gas and propane supplies. 7. A time delay of 10 seconds (standard) or 30 sec- onds (depending on insu
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Maintenance all steps and safety checks are repeated. The mo- 12. When the water temperature is reduced by the torized gas valves cannot reopen in the absence of load on the system, the operating control switch ignition. will close again. The operating sequence will re- cycle to step 5, provided that the limits on water 11. When the desired water temperature is reached, flow, gas pressure, and high temperature are all the operating control switch opens and the pro- met. grammer i
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Gemini™ Twin-Fuel Gas-Fired Boiler 8.1.1 Wiring Diagram (Lo-Hi-Lo) - 18 -
