GGIG-99 INSTALLATION & 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 OWNER’S MANUAL ®
Gemini™ Twin-Fuel Gas-Fired Boiler TABLE OF CONTENTS 1.0 INTRODUCTION ......................................... 1 2.0 DESCRIPTION ............................................ 2 2.1 Principle of Operation.............................. 2 3.0 SAFETY ...................................................... 2 3.1 General ................................................... 2 3.2 Training ................................................... 2 3.3 Safety Features....................................... 3 3.
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.
Geminiâ Twin-Fuel Gas-Fired Boiler 2.0 DESCRIPTION by a selector switch on the boiler (or by a signal from a remote switch or controller). 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.
Safety tion of the boiler, adjustment of its various mechanisms, and all applicable safety precautions. If any of the provisions of this manual are not fully and completely understood, contact the Patterson-Kelley Sales Department at (570) 421-7500 for assistance. 3.
Gemini™ Twin-Fuel Gas-Fired Boiler good condition. Do not alter wiring connections. Annual inspection by factory-trained personnel for proper set-up and operation is recommended. lines for gas devices. See Section 4 below. · Hazard from incorrect fuels! Possible fire, explosion, 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.
Installation motorized gas valve (natural gas) pilot regulator and solenoid valve mechanical link to control air (Lo-Hi-Lo only) * regulator burner pilot shutoff natural gas connection manual shutoff pressure tap low gas pressure switch * secondary shutoff, manual leak test valves propane connection manual shutoff regulator high gas pressure switch * motorized gas valve n.o. vent valve (I.R.I.
Gemini™ Twin-Fuel Gas-Fired Boiler Gas Pressure Adjustment natural gas supply Test of Motorized Gas Valves remote gas shutoff (not supplied) 4.2 GAS PIPING Before making the gas hook-up, make sure the 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 boiler with MAPP gas, sewage gas, coal gas, or other fuels.
Installation shutoff valves (located at the end of the supplied gas train) from the gas and propane supply systems during any pressure testing of the system at pressures in excess of 1/2 psig (14 inches W.C.). 4.3 PRE-START CHECK LIST During any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 psig (14 inches W.C.), the boiler should be isolated from the gas supply piping system by closing both manual shutoff valves. 1. Flue gas from the boiler is properly vented.
Gemini™ Twin-Fuel Gas-Fired Boiler high limit temperature adjustment operating temperature adjustment propane in-use indicator and fuel selector switch (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 reset flame control reset switch "on"/"off" switch Figure 4-5a On-Off Control Panel (faceplate opened) The boiler is provided with an ignition safety system. 1.
Installation surance or local codes require, go to a "lockout” mode. Lockout will require manual reset of the flame safeguard. 4.4.4 Test of Gas Pressure Switch 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.
Gemini™ Twin-Fuel Gas-Fired Boiler "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 Firetest" label (affixed to the back of the cabinet) should be used to achieve the proper firing rate of the individual boiler as installed. Replace seal cap after adjustment. 4.4.5 Gas Pressure Adjustment Increase Decrease 4.4.6 Leak Testing of Valves Annually test for by-pass leaks on all motorized gas valves.
Installation leak test valve. (Refer to Figure 4-8 above.) Insert the free end of the hose in a cup of water. 4. Open the downstream leak test valve and check for bubbles in the hose. If there are no bubbles the secondary motorized gas valve is OK. If there are bubbles, replace the valve. 5. Attach the hose to the upstream leak test valve. - 11 - 6. Open the upstream leak test valve and check for bubbles in the hose. If there are no bubbles the natural gas motorized gas valve is OK.
Gemini™ Twin-Fuel Gas-Fired Boiler mechanical link to air control auxiliary panel (service power shutoff switch inside) main gas valve pressure tap high gas pressure switch water connection secondary shutoff low pressure switches (visible from side) propane connection (1 1/4") and shutoff propane gas valve pilot gas supply natural gas connection (2") and shutoff propane regulator natural gas regulator natural gas gas valve auxiliary panel (service power shutoff switch inside) propane low press
Operation 5.0 OPERATION 5.1 GENERAL 5.2 LIGHTING AND SHUT-DOWN PROCEDURES The basic operation and control functions of the Gemini™ twin-fuel gas boiler are similar to the single-fuel models. 5.2.1 Lighting Procedures high limit/operating temperature adjustments high limit reset fuel selector switch propane in-use indicator 5.1.
Gemini™ Twin-Fuel Gas-Fired Boiler 1. Close main (natural gas and propane) and pilot shutoffs. 5.3 SWITCHOVER TO PROPANE OPERATION Switchover from natural gas to propane is made manually, as follows: 2. Turn the On/Off switch to "OFF" position. 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.
Maintenance motorized gas valve (natural gas) pilot regulator and solenoid valve mechanical link to control air (Lo-Hi-Lo only) * regulator burner pilot shutoff natural gas connection manual shutoff pressure tap low gas pressure switch * propane connection manual shutoff regulator leak test valves secondary shutoff, manual high gas pressure switch * motorized gas valve n.o. vent valve (I.R.I.
Gemini™ Twin-Fuel Gas-Fired Boiler tor and the air flow switch, which initially shows low air flow with the "LowAir" indicator. This indicator will remain on until sufficient air flow is sensed. In the case of the twin-fuel boiler, the phrase “main gas cock” or “main gas valve” as used in the “Installation and Owner’s Manual” applies to the manual shutoffs for both the natural gas and propane supplies. 7.
Maintenance 12. When the water temperature is reduced by the load on the system, the operating control switch will close again. The operating sequence will recycle to step 5, provided that the limits on water flow, gas pressure, and high temperature are all met. all steps and safety checks are repeated. The motorized gas valves cannot reopen in the absence of ignition. 11.
Gemini™ Twin-Fuel Gas-Fired Boiler 8.1.
Parts and Technical Support 8.1.
Gemini™ Twin-Fuel Gas-Fired Boiler 8.1.
Parts and Technical Support 8.1.
