Review with owner, Gas Train and Controls | Lochinvar 500, 90

Installation & Service Manual

8Maintenance

IMPORTANT

Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while main burners are operating. Immediately repair any leak found in the gas train or related components. Do Not operate an appliance with a leak in the gas train, valves or related piping.

Review with owner

1.	Review the User’s Information Manual with the owner.
2.	Emphasize the need to perform the maintenance schedule
	specified in the User’s Information Manual (and in this
	manual as well).
3.	Remind the owner of the need to call a licensed contractor
	should the appliance or system exhibit any unusual

Gas Train and Controls

GAS FLOW

behavior.

4. Remind the owner to follow the proper shutdown procedure

and to schedule an annual start-up at the beginning of the

next heating season.

Figure 8-4_Gas Train 90,000 - 399,999 Btu/hr Models

Figure 8-5_Gas Train 500,000 Btu/hr Model

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Image 60

Lochinvar 500, 90 service manual Review with owner, Gas Train and Controls

Contents

Models 90,000 500,000 Btu/hr Contents Please read before proceeding Checking equipment Codes Ratings Copper-fin =B=R Rating Copper-fin Specifications Copper-fin How it works Gas connection pipe Models CWN270 Front View Model CWN399 Front View 422 Determine unit location Location of unit Determine boiler location 3Combustion Air Direct from Outside 6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Venting Conventional Negative Draft Venting SystemVent Pipe Sizes Venting Vertical Vent Termination Clearances Less from Ridge From Parapet Wall Masonry Chimney Installation Vent MaterialsSidewall Venting Number Automatic Vent Damper 7CB with Vent Damper and Vent Damper Terminal Block Gas connections Gas Supply Gas Pressure TestGas Connection Manifold Pressure Install Piping to Control Gas Piping Gas Manifold Pressure Adjustment Procedure Clockwise to raise regulator gas pressure, counterclockwise Checking Gas Supply Pressure 4Gas Supply Pressure Combination Gas Valves Venting of Combination Gas ValvesTwo Stage Burner Control System Water Flow Switch if equipped Hydronic pipingRelief Valve Typical Heating Boiler Installations Low Water Cutoff if equippedMinimum Required Flow For Heating Boiler General Plumbing Rules System Temperature Rise Chart Piping of the Boiler System Heat Exchanger Pressure Drop Chart Circulator Pump SpecificationsWater Connections Heating Boilers Only Circulator Pump Requirements Primary/Secondary Boiler Piping Three Way Valves Boiler Flow Rates Primary / Secondary Piping 4Primary / Secondary Piping of a Single Boiler Not to Exceed 4 Pipe DIA or MAX. of 12 Apart 8Multiple Boilers Zoned with Circulators Terminal Strip Wiring Boiler Operating Temperature ControlPower Venter Connection to Terminal Strip Electrical connections Temperature Adjustment Pump Wiring for a Heating BoilerOperating Temperature Control Locating Temperature Control Temperature Control SettingsMaximum SET Point Determination Maximum Set Point Determination Temperature Control Sensors Inlet Water Temperature SensorMulti-Purpose Temperature Sensor Outdoor Air Temperature Sensor Outdoor Air Reset Option Installation of a Remote Sensor Boiler ApplicationInstallation of a Tank Sensor Water Heater Application Additional Temperature Controls Blocked Vent and Flame Roll-Out / Flame Interlock Switch Manual Reset High Water Temperature Limit Control Pre-start Checklist Start-upInitial Start-up Lighting Instructions 1Gas Valve 90,000 270,000 Btu/hr Models Safety Shutoff Test For Standing Pilot Ignition System To Turn OFF GAS to Appliance Operating Instructions Safety Shutoff Test for Spark Ignition Pilot System Intermittent Pilot Spark Ignition System F9/M9Freeze Protection To Turn Off Gas to Appliance Water Treatment Freeze Protection for a Heating Boiler System if required Required Temperature Rise Required Temperature RiseDomestic water heaters Domestic Water Heaters 90,000 500,000 Btu/hr Models Water Chemistry Softened Water SystemsPump Operation 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Remote Sensor Installation Thermostat SettingsMinimum Pump Performance Heat Exchanger 5Danger Warning Water Flow Switch if equipped Pressure Only Relief ValveThermal Expansion Cathodic Protection Maintenance and annual startup Service technicianOwner maintenance See the User’s Information Manual for instructions Maintenance Check Expansion Tank Check Relief Valve Check All Wiring Check Control SettingsCombustion Air Adjustment Perform Start-up and Checks Inspect and Clean Burner Heat Exchanger / Burner AccessInspection and Cleaning Procedure Pilot Flame Adjustment Procedure Clear AreaInspection of Heat Exchanger Waterways Water Circulating Pump Review with owner Gas Train and Controls Troubleshooting Pilot or replace Diagrams Schematic Diagram F1 UnitWiring Diagram F1 Unit 90,000 270,000 Btu/hr Models Schematic Diagram F9 Unit Wiring Diagram F9 Unit315,000 399,999 Btu/hr Models Diagrams Diagrams Page Revision a ECO #C06290 initial release CFA-I-S Rev a 09/10