2Single water heatermultiple tank | Lochinvar 90, 500 guide

Installation & Service Manual

7Domestic water heaters (continued)

Figure 7-2_Single water heater_multiple tank

COLD WATER

SUPPLY

MIXING VALVE

THERMOMETER

HOT WATER

SUPPLY

UNION (TYPICAL)

TEMPERATURE & PRESSURE RELIEF VALVE (TYPICAL)

STORAGE TANK (TYPICAL)

DRAIN (TYPICAL)

FLOW CHECK

VALVE (TYPICAL)

EXPANSION

TANK

BUILDING

RETURN

RELIEF VALVE ( TYPICAL )

TEMPERATURE/

PRESSURE

GAUGE

FLOW

SWITCH

WATER

HEATER

WATER HEATER

CIRCULATOR

BALL VALVE (TYPICAL)

Y-STRAINER (RECOMMENDED)

NOTICE

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

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Image 49

Lochinvar 90, 500 service manual 2Single water heatermultiple tank

Contents

Models 90,000 500,000 Btu/hr Contents Checking equipment Please read before proceeding Codes Copper-fin =B=R Rating Ratings Copper-fin Specifications Gas connection pipe Copper-fin How it works Models CWN270 Front View Model CWN399 Front View 422 Location of unit Determine unit location 3Combustion Air Direct from Outside Determine boiler location 6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Conventional Negative Draft Venting System VentingVent Pipe Sizes Venting Less from Ridge From Parapet Wall Vertical Vent Termination Clearances Vent Materials Masonry Chimney InstallationSidewall Venting Number 7CB with Vent Damper and Vent Damper Terminal Block Automatic Vent Damper Gas Supply Gas Pressure Test Gas connectionsGas Connection Manifold Pressure Gas Piping Install Piping to Control Clockwise to raise regulator gas pressure, counterclockwise Gas Manifold Pressure Adjustment Procedure 4Gas Supply Pressure Checking Gas Supply Pressure Venting of Combination Gas Valves Combination Gas ValvesTwo Stage Burner Control System Hydronic piping Water Flow Switch if equippedRelief Valve Low Water Cutoff if equipped Typical Heating Boiler InstallationsMinimum Required Flow For Heating Boiler General Plumbing Rules Piping of the Boiler System System Temperature Rise Chart Circulator Pump Specifications Heat Exchanger Pressure Drop ChartWater Connections Heating Boilers Only Circulator Pump Requirements Primary/Secondary Boiler Piping Boiler Flow Rates Three Way Valves 4Primary / Secondary Piping of a Single Boiler Primary / Secondary Piping Not to Exceed 4 Pipe DIA or MAX. of 12 Apart 8Multiple Boilers Zoned with Circulators Boiler Operating Temperature Control Terminal Strip WiringPower Venter Connection to Terminal Strip Electrical connections Pump Wiring for a Heating Boiler Temperature AdjustmentOperating Temperature Control Temperature Control Settings Locating Temperature ControlMaximum SET Point Determination Maximum Set Point Determination Inlet Water Temperature Sensor Temperature Control SensorsMulti-Purpose Temperature Sensor Outdoor Air Temperature Sensor Installation of a Remote Sensor Boiler Application Outdoor Air Reset OptionInstallation of a Tank Sensor Water Heater Application Additional Temperature Controls Manual Reset High Water Temperature Limit Control Blocked Vent and Flame Roll-Out / Flame Interlock Switch Start-up Pre-start ChecklistInitial Start-up 1Gas Valve 90,000 270,000 Btu/hr Models Lighting Instructions To Turn OFF GAS to Appliance Safety Shutoff Test For Standing Pilot Ignition System Operating Instructions Intermittent Pilot Spark Ignition System F9/M9 Safety Shutoff Test for Spark Ignition Pilot SystemFreeze Protection To Turn Off Gas to Appliance Freeze Protection for a Heating Boiler System if required Water Treatment Required Temperature Rise Required Temperature RiseDomestic water heaters Domestic Water Heaters 90,000 500,000 Btu/hr Models Softened Water Systems Water ChemistryPump Operation 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Thermostat Settings Remote Sensor InstallationMinimum Pump Performance Heat Exchanger 5Danger Warning Pressure Only Relief Valve Water Flow Switch if equippedThermal Expansion Cathodic Protection Service technician Maintenance and annual startupOwner maintenance See the User’s Information Manual for instructions Maintenance Check Relief Valve Check Expansion Tank Check Control Settings Check All WiringCombustion Air Adjustment Perform Start-up and Checks Heat Exchanger / Burner Access Inspect and Clean BurnerInspection and Cleaning Procedure Clear Area Pilot Flame Adjustment ProcedureInspection of Heat Exchanger Waterways Water Circulating Pump Gas Train and Controls Review with owner Troubleshooting Pilot or replace Schematic Diagram F1 Unit DiagramsWiring Diagram F1 Unit 90,000 270,000 Btu/hr Models Wiring Diagram F9 Unit Schematic 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