Combination Gas Valves | Lochinvar 45000, 260000 specification

3Gas connections

Combination Gas Valves

Installation & Service Manual

Venting of Combination Gas Valves

PRESSURE REGULATOR

ADJUSTMENT

WIRING TERMINALS

(UNDER CAP SCREW)

INLET PRESSURE TAP

SGACONTROL KNOB

OUTLET

PRESSURE TAP

PILOT OUTLET

The combination gas valve regulator used on all models is equipped with an integral vent limiting orifice. The vent limiter ensures that the volume of gas emitted from the valve does not exceed the maximum safe leakage rate allowed by agency requirements. Combination gas valve/regulators equipped with integral vent limiters are not required to have vent or relief lines piped to the outdoors. A dust cap is provided at the vent termination point on the valve to prevent blockage of the vent limiter by foreign material. The combination gas valve regulator with an integral vent limiter complies with the safety code requirements of CSD-1, CF-190(a) as shipped from

Figure 3-5_M9 Gas Valve

Each unit has a combination gas valve to control the gas supply to the burners. The combination valve consists of a gas regulator and two valve seats to meet the requirements for redundant gas valves. The valve has a gas control knob that must remain in the open position at all times when the appliance is in service. Each gas valve has pressure taps located on the inlet and outlet sides. Manifold pressure is adjusted using the regulator located on the valve. The manifold pressure is preset at the factory and adjustment is not usually required. If the manifold pressure is to be adjusted, follow the “Gas Manifold Pressure Adjustment Procedure”, page 20 for proper adjustment.

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the manufacturer without the installation of additional vent lines.

Two Stage Burner Control System

The 45,000 thru 260,000 Btu/hr boilers (M9) are equipped with a two stage burner control system.

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Lochinvar 45000, 260000 service manual Venting of Combination Gas Valves, Two Stage Burner Control System

Contents

Models 45,000 260,000 Btu/hr Contents Warranty Please read before proceeding Codes Solution Boiler =B=R Rating Ratings Solution How it works Temperature and pressure gauge Solution How it works Solution How it works Determine boiler location Location of unit 3Combustion Air Direct from Outside 6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Conventional Negative Draft Venting System VentingVent Pipe Sizes Venting Vertical Vent Termination Clearances Less from Ridge From Parapet Wall Vent Materials Masonry Chimney InstallationSidewall Venting Negative Draft Fan Assisted Venting Automatic Vent Damper 7Vent Damper and Vent Damper Terminal Block Gas Supply Gas Pressure Test Gas connectionsGas Connection Install Piping to Control Gas Piping Gas Manifold Pressure Adjustment Procedure 2Wrench Checking Gas Supply Pressure 4Gas Supply Pressure Venting of Combination Gas Valves Combination Gas ValvesTwo Stage Burner Control System Water connections Water Flow Switch if equippedRelief Valve Minimum Required Flow For Heating Boiler Typical Heating Boiler InstallationsLow Water Cutoff if equipped General Plumbing Rules System Temperature Rise Chart Piping of the Boiler System Water Connections Heat Exchanger Pressure Drop ChartCirculator Pump Requirements Primary/Secondary Boiler Piping Circulator Pump SpecificationsCirculator Pump Operation Full Flow Application Low Temperature Bypass RequirementsBoiler Flow Rates Primary / Secondary Piping Make UP Water Make UP Water 6Multiple Boilers Zoned with Circulators Full System Flow From System 8Single Boiler Full System Flow with Low Temperature Bypass Electrical connections Terminal Strip WiringBoiler Operating Temperature Control Auxiliary Device Connection to Terminal Strip Temperature Adjustment AMP Draw Data Maximum SET Point Determination Maximum Set Point Determination Wiring of Remote Sensors Outdoor Air Temperature SensorInstallation of Remote Sensors Outdoor Air Reset Option Additional Temperature Controls Blocked Vent and Flame Roll-Out / Flame Interlock Switch 7Blocked Vent Switch Location Initial Start-up Pre-start ChecklistStart-up Lighting Instructions for Spark Ignition Pilot Models Operating Instructions Safety Shutoff Test for Spark Ignition Pilot SystemTo Turn Off Gas to Appliance Water Treatment Intermittent Pilot Spark Ignition SystemFreeze Protection Ignition and Control Timings Owner maintenance Maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructions Maintenance Check Expansion Tank Check Relief Valve Heat Exchanger / Burner Access Check All WiringCheck Control Settings Perform Start-up and Checks Inspection and Cleaning Breathing Fresh air Gas Train and Controls Review with ownerInspection of Heat Exchanger Waterways Water Circulating Pump Troubleshooting Troubleshooting Guide M9 Solution Boilers Wiring Diagram M9 Unit 45,000 260,000 Btu/hr Models DiagramsSchematic Diagram M9 Unit 45,000 260,000 Btu/hr Models