Lochinvar 260000, 45000 Water connections, Relief Valve, Water Flow Switch if equipped

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4Water connections

Relief Valve

RELIEF VALVE

Figure 4-1_Relief Valve

Installation & Service Manual

Water Flow Switch (if equipped)

FLOW SWITCH

FLOW

Figure 4-2_Water Flow Switch - Top Connections

This appliance is supplied with a relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV (“Heating Boilers”). The relief valve(s) is mounted directly into the heat exchanger inside the header (see FIG. 4-1). To prevent water damage, the discharge from the relief valve shall be piped to a suitable floor drain for disposal when relief occurs. No reducing couplings or other restrictions shall be installed in the discharge line. The discharge line shall allow complete drainage of the valve and line. Relief valves should be manually operated at least once a year.

CAUTION Avoid contact with hot discharge water.

A water flow switch is available as a factory supplied option on all heating boilers (see FIG. 4-2). The flow switch should be wired between terminals X and B. Remove the jumper between the X and B terminals on the terminal strip. This wiring connection installs the flow switch in the 24 VAC safety circuit to prove water flow before main burner ignition. A flow switch installed with the factory supplied minimum adjustment setting requires a specific minimum flow to make the switch and start burner operation. The flow rate required is a function of the diameter of pipe and tee used for installation. Ensure that the pump installed on the boiler will supply adequate flow to make the flow switch contacts and operate the boiler.

A water flow switch meets most code requirements for a low water cut off device on boilers requiring forced circulation for operation.

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Contents Models 45,000 260,000 Btu/hr Contents Please read before proceeding WarrantyCodes Ratings Solution Boiler =B=R RatingTemperature and pressure gauge Solution How it worksSolution How it works Solution How it works Location of unit Determine boiler location3Combustion Air Direct from Outside 6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Vent Pipe Sizes VentingConventional Negative Draft Venting System Venting Less from Ridge From Parapet Wall Vertical Vent Termination ClearancesFan Assisted Venting Masonry Chimney InstallationSidewall Venting Negative Draft Vent Materials7Vent Damper and Vent Damper Terminal Block Automatic Vent DamperGas Connection Gas connectionsGas Supply Gas Pressure Test Gas Piping Install Piping to Control2Wrench Gas Manifold Pressure Adjustment Procedure4Gas Supply Pressure Checking Gas Supply PressureTwo Stage Burner Control System Combination Gas ValvesVenting of Combination Gas Valves Relief Valve Water Flow Switch if equippedWater connections General Plumbing Rules Typical Heating Boiler InstallationsLow Water Cutoff if equipped Minimum Required Flow For Heating BoilerPiping of the Boiler System System Temperature Rise ChartCirculator Pump Requirements Heat Exchanger Pressure Drop ChartWater Connections Circulator Pump Operation Circulator Pump SpecificationsPrimary/Secondary Boiler Piping Boiler Flow Rates Low Temperature Bypass RequirementsFull Flow Application Make UP Water Primary / Secondary PipingMake UP Water 6Multiple Boilers Zoned with Circulators From System Full System Flow8Single Boiler Full System Flow with Low Temperature Bypass Auxiliary Device Connection to Terminal Strip Terminal Strip WiringBoiler Operating Temperature Control Electrical connectionsAMP Draw Data Temperature AdjustmentMaximum Set Point Determination Maximum SET Point DeterminationInstallation of Remote Sensors Outdoor Air Temperature SensorWiring of Remote Sensors Additional Temperature Controls Outdoor Air Reset Option7Blocked Vent Switch Location Blocked Vent and Flame Roll-Out / Flame Interlock SwitchLighting Instructions for Spark Ignition Pilot Models Pre-start ChecklistStart-up Initial Start-upTo Turn Off Gas to Appliance Safety Shutoff Test for Spark Ignition Pilot SystemOperating Instructions Ignition and Control Timings Intermittent Pilot Spark Ignition SystemFreeze Protection Water TreatmentSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Check Relief Valve Check Expansion TankPerform Start-up and Checks Check All WiringCheck Control Settings Heat Exchanger / Burner AccessBreathing Fresh air Inspection and CleaningWater Circulating Pump Review with ownerInspection of Heat Exchanger Waterways Gas Train and ControlsTroubleshooting Guide M9 Solution Boilers Troubleshooting45,000 260,000 Btu/hr Models DiagramsSchematic Diagram M9 Unit Wiring Diagram M9 Unit 45,000 260,000 Btu/hr Models