1Single water heatersingle tank | Lochinvar 500, 90 specs

7Domestic water heaters

Figure 7-1_Single water heater_single tank

		BALL VALVE
		(TYPICAL)
	COLD WATER	FLOW CHECK
	COLD WATER	VALVE (TYPICAL)
	SUPPLY	VALVE (TYPICAL)
	SUPPLY
	MIXING VALVE
	THERMOMETER	EXPANSION
	THERMOMETER	TANK
		TANK
	HOT WATER
	SUPPLY
	UNION
	(TYPICAL)
	TEMPERATURE

&PRESSURE RELIEF VALVE (TYPICAL)

STORAGE
TANK	DRAIN

Installation & Service Manual

BUILDING

RETURN

FLOW

SWITCH

WATER

HEATER

WATER HEATER

CIRCULATOR

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.

48

Image 48

Lochinvar 500, 90 service manual 1Single water heatersingle tank

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