Manuals / Lochinvar / Household Appliance / Water Heater

Lochinvar 90, 500 service manual Not to Exceed 4 Pipe DIA or MAX. of 12 Apart

Models: 90 500

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Installation & Service Manual

4Hydronic piping (continued)

Primary / Secondary Piping

Figure 4-5_Single Boiler - Primary / Secondary with Low Temperature Bypass

MAY SUBSTITUTE

LOW LOSS HEADER

AIR SEPARATOR

DRAIN POINT (TYPICAL)

SYSTEM SUPPLY SENSOR (WHEN USED)

SYSTEM CIRCULATOR

PRESSURE GAUGE

M

E

T

S

Y

S

O

T

EXPANSION TANK

M

E

T

S

Y

S

M

O

R

F

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
BALL VALVE
(TYPICAL)
LOW TEMPERATURE BYPASS
	PRESSURE RELIEF
	VALVE
	TEMPERATURE / PRESSURE
Y-STRAINER	GAUGE
(RECOMMENDED)

MAKE UP WATER

	BACK FLOW		FLOW SWITCH
	BACK FLOW
	PREVENTER	FLOW CHECK	DRAIN
	PRESSURE REDUCING	FLOW CHECK	DRAIN
	PRESSURE REDUCING	VALVE (TYPICAL)
	VALVE
		BOILER CIRCULATOR	BOILER
			BOILER
			UNION (TYPICAL)

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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Lochinvar 90, 500 service manual Not to Exceed 4 Pipe DIA or MAX. of 12 Apart

Contents

Models 90,000 500,000 Btu/hr Contents Checking equipment Please read before proceedingCodes Copper-fin =B=R Rating RatingsCopper-fin Specifications Gas connection pipe Copper-fin How it worksModels CWN270 Front View Model CWN399 Front View 422 Location of unit Determine unit location3Combustion Air Direct from Outside Determine boiler location6Combustion 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 ClearancesNumber Masonry Chimney InstallationVent Materials Sidewall Venting7CB with Vent Damper and Vent Damper Terminal Block Automatic Vent DamperManifold Pressure Gas connectionsGas Supply Gas Pressure Test Gas ConnectionGas Piping Install Piping to ControlClockwise to raise regulator gas pressure, counterclockwise Gas Manifold Pressure Adjustment Procedure4Gas Supply Pressure Checking Gas Supply PressureVenting of Combination Gas Valves Combination Gas ValvesTwo Stage Burner Control System Hydronic piping Water Flow Switch if equippedRelief Valve 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 ChartCirculator Pump Specifications Water Connections Heating Boilers OnlyPrimary/Secondary Boiler Piping Boiler Flow Rates Three Way Valves4Primary / Secondary Piping of a Single Boiler Primary / Secondary PipingNot to Exceed 4 Pipe DIA or MAX. of 12 Apart 8Multiple Boilers Zoned with Circulators Electrical connections Terminal Strip WiringBoiler Operating Temperature Control Power Venter Connection to Terminal StripPump Wiring for a Heating Boiler Temperature AdjustmentOperating Temperature Control Maximum Set Point Determination Locating Temperature ControlTemperature Control Settings Maximum SET Point DeterminationOutdoor Air Temperature Sensor Temperature Control SensorsInlet Water Temperature Sensor Multi-Purpose Temperature SensorInstallation 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 SwitchStart-up Pre-start ChecklistInitial Start-up 1Gas Valve 90,000 270,000 Btu/hr Models Lighting InstructionsTo Turn OFF GAS to Appliance Safety Shutoff Test For Standing Pilot Ignition SystemOperating Instructions To Turn Off Gas to Appliance Safety Shutoff Test for Spark Ignition Pilot SystemIntermittent Pilot Spark Ignition System F9/M9 Freeze ProtectionFreeze Protection for a Heating Boiler System if required Water TreatmentDomestic Water Heaters 90,000 500,000 Btu/hr Models Required Temperature RiseRequired Temperature Rise Domestic water heatersSoftened Water Systems Water ChemistryPump Operation 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Heat Exchanger Remote Sensor InstallationThermostat Settings Minimum Pump Performance5Danger Warning Cathodic Protection Water Flow Switch if equippedPressure Only Relief Valve Thermal ExpansionSee the User’s Information Manual for instructions Maintenance and annual startupService technician Owner maintenanceMaintenance Check Relief Valve Check Expansion TankPerform Start-up and Checks Check All WiringCheck Control Settings Combustion Air AdjustmentHeat Exchanger / Burner Access Inspect and Clean BurnerInspection and Cleaning Procedure Water Circulating Pump Pilot Flame Adjustment ProcedureClear Area Inspection of Heat Exchanger WaterwaysGas Train and Controls Review with ownerTroubleshooting Pilot or replace 90,000 270,000 Btu/hr Models DiagramsSchematic Diagram F1 Unit Wiring Diagram F1 UnitWiring 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