Smith Cast Iron Boilers GT Series manual Pressure Relief Valve, Relief Valve Piping

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GT INSTALLATION AND OPERATION INSTRUCTIONS

Understand and follow the plumbing requirements provided in this section. Keep serviceability in mind when installing plumbing around the boiler cabinetry. Install fi ttings that will allow the system to be fl ushed if needed during annual check-ups. Add an inhibitor to the system water to prevent lime and magnetite deposits from forming, and to protect the boiler from galvanic corrosion. A minimum clearance of 1 in, 25 mm must be maintained between heating system pipes and all combustible construction. All heating system piping must be supported by suitable hangers not the boiler. The thermal expansion of the system must be considered when supporting the system. A minimum system pressure of 12 psig, 84 kPa must be maintained.

Hot water boilers are designed to operate with airless water in the system. The GT boiler is provided with a 1/8 in, 3 mm, air vent located on the top of the unit. This air vent is intended to vent the boiler on initial startup. This device will NOT continuously vent air collecting in the primary loop and is not intended to be the primary venting device. The air scoop as shown in Figure 21 is the primary venting location. It is recommended that an additional air scoop be used in the secondary plumbing. If air continues to be a problem an air scrubber must be used.

NOTE: Only inhibited propylene glycol solutions should be used if freeze protection is required. Avoid using mixtures greater than 30%, unless the size of the boilers’ circulator(s) is increased accordingly. Under no circumstances should a 50% mixture be exceeded.

Pressure Relief Valve

Each boiler is equipped with a 30 psi pressure relief valve that must be piped in accordance with the ANSI/ ASME Boiler and Pressure Vessel Code, Section IV to prevent scalding of persons with hot liquid or vapor in the event of a discharge, see Figure 20.

Support the relief valve discharge piping to prevent strain on the valve body. Leave the open end of the relief valve discharge pipe visible for periodic inspection.

NOTE: The discharge pipe diameter must be the same at the relief valve output diameter. Never restrict the outlet relief valve.

WARNING: Never install any type of valve between the boiler and the relief valve or an explosion causing extensive property damage, severe personal injury or death may occur!

Figure 20 - Relief Valve Piping

Non ASME GT-150

All ASME Models

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Contents Gama Energy Star North ELM Street WESTFIELD, MA 01085 TEL 562-9631 FAX 413Contents Before YOU StartBoiler Ratings & Capacities Boiler Location Input vs Elevation GraphCombustion AIR General Venting GuidelinesHorizontal Direct Vent Systems Separate Air Intake and Vent Terminals Horizontal Terminal LocationsWall Penetration Detail External Air Intake and Vent Systems Debris Screen Installation Vertical Direct Vent SystemsCondensate Drain Concentric Through the RoofGeneral Plumbing Guidelines Pressure Relief Valve Relief Valve PipingMultiple Boiler Primary Loop Primary Loop PlumbingSecondary Loop Plumbing Low Water Cut Off, LwcoSingle Boiler with Indirect Hot Water Heater Multiple Boiler Installation Multiple Zones Using Circulators Multiple Zones Valves with Bypass Valve Equivalent Pipe Length Chart GAS Supply PipingGas Pipe Capacity Electrical Wiring Thermostat InstallationMultiple Zones w/ Taco Valve Controller Models ZVC403 to ZVC Multiple 4 Wire Zone Valves GT Installation and Operation Instructions GT Installation and Operation Instructions Boiler Ladder Diagram Boiler Connection Diagram Sentry 2100T Controller Boiler ModulationIndirect Water Heaters Sentry DisplaySetting Sentry 2100T control Recommended SettingsRecommend System Temperatures Outdoor Sensor 10KDetermining Reset Temperature HICalc = 200F, 93C 70F, 21C /70F, 21C=140.6 F, 42C Boiler SET UP Operating InstructionsNormal Flue Gas Composition Natural Gas Propane Gas Valve Layout, GT-150 Ignition SystemOperational Flow Chart For Your Safety Read Before Operating Boiler Checking & Adjustment Gas Pressure AdjustmentInput Rate Main Burner FlameBoiler Maintenance Wall Hung Conversion Aquastat High LimitTrouble Shooting Temperature isBurner shuts off Before set-pointAir Switch is Open Air Switch is ClosedIndicates that Ignition SequenceTwo Flashes on FenwalThree Flashes on Boiler will not stayCreating a noise Residence. This is not a warranty issue HousingWarranty issue Sentry ControllerGT Installation and Operation Instructions Replacement Parts List Replacement Parts Exploded View Models GT150 and GT200Replacement Parts Exploded View Model GT400 GT Installation and Operation Instructions WESTCAST, INC
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