Table Q, Water Flow Switch, LOW Water Cutoff

Lochinvar 000, 1 warranty Table Q, Water Flow Switch, LOW Water Cutoff, GAS Train and Controls

Page 32

TABLE - Q

Minimum Inlet Water Temperatures

Input	Minimum Return	Minimum
Btu/hr	Temperature	Setpoint

1,500,000	50°F (10°C)	105°F (40.6°C)
___________	____________________	_______________
1,700,000	50°F (10°C)	90°F (32.2°C)
___________	____________________	_______________
2,000,000	50°F (10°C)	70°F (23.9°C)

CAUTION

An appliance allowed to operate at return temperatures below the specified minimum settings may experience problems with the operating controls, safety switches, obstruction of the flue gas passages on the primary heat exchanger, incomplete combustion and possible flue gas spillage. Sustained operation at lower than specified water temperatures may cause hazardous conditions that may result in personal injury or non-warrantable damage to the appliance.

A boiler installed above radiation level must be provided with a low water cutoff device either as part of the unit or at the time of installation.

WATER FLOW SWITCH

A water flow switch is factory installed in the internal bypass piping on all heating boilers, hot water supply boilers and water heaters. The flow switch is wired in series with the 24 VAC safety control circuit. This wiring connection installs the flow switch in the 24 VAC safety circuit to prove water flow before main burner ignition. A factory supplied flow switch installed in the discharge piping from the top header requires a minimum flow of 26 GPM to make the flow switch and start burner operation. A water flow switch meets most code requirements for a low-water cut off device on boilers requiring forced circulation for operation. A status point alarm of LowH2OFlow will be indicated in the Command Display on a low water condition as sensed by the flow switch.

LOW WATER CUTOFF

(If Equipped)

If this boiler is installed above radiation level, a low water cut-off device must be installed at the time of boiler installation. Electronic or float type low water cut-offs are available as a factory supplied option on all models. Low water cut-offs should be inspected every six months, including flushing of float types. A status point alarm of LowH2OFlow will be indicated in the Command Display on a low water condition as sensed by a low water cutoff.

GAS TRAIN AND CONTROLS

ORIFICE

DIAPHRAGM

VALVE

RATIO VALVE

FIG. 42 Gas Train Assembly

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Contents

IFB/IFW-i&s-05 WarrantySpecial Instructions To Owner Table of Contents Checking Equipment Do notWhat to do if YOU Smell GAS Owner WarningInstallation Procedure Location of Unit Recommended Service ClearancesTable a Clearances from Combustible ConstructionCombustion Air Direct from Outside Table B Minimum Recommended CombustionAIR Supply to Mechanical Room 500 in2 3226 cm2 667 in2 4303 cm2 000 in2 12,903 cm2Construction AIR Filter Construction Air FilterConstruction AIR Filter Kits Table C VentingTable D Category IV Flue Pipe SizesCategory IV Positive Pressure Venting System Category IV VentingCategory IV Flue Pipe Materials Venting Guidelines for a Category IV VentExceed a maximum of 100 equivalent feet 30.5 m in length Drain Tee InstallationGeneral Category IV Vent Termination Clearances Masonry Chimney Installations Vertical Venting TerminationsSidewall Venting Terminations Table ESidewall Vent Cap Kits Sidewall VentLocation of a Sidewall Vent Termination Direct Vent INTELLI-VENT SystemsTable F Direct Vent and Intelli-Vent Flue Air Inlet Pipe SizesAir Inlet Length of Air Inlet PipeVertical Direct Vent Systems Combined Combustion Air Inlet PointsMultiple Vertical Direct Vent Installations Horizontal Direct VentLocation of a Sidewall Air Inlet Cap Sidewall Combustion AIR InletTable G Multiple Horizontal Direct Vent Installations These areTable H Combined Air Inlet PointsMaximum Length of an Intelli-Vent System Air Inlet Sidewall Input Flue Pipe Btu/hr SizeHorizontal INTELLI-VENT with Vertical Combustion AIR Air Inlet Sidewall Input Flue PipeBtu/hr Size Cap Kit 500,000 SVK3026Vertical Combustion Horizontal INTELLI-VENT AIR Inlet Location of a Rooftop Air Inlet CapTable J GAS Supply GAS Pressure Test Table KGAS Connection Table LRecommended Gas Pipe Size Single Appliance Installations Multiple Appliance Installations Gas Pipe Size ChartTable M Table NGAS Manifold Pressure Adjustment Install Piping to ControlGAS Piping Checking GAS Supply PressureChecking Manifold GAS Pressure Water Connections Water ConnectionsMinimum Pipe Size Requirements Secondary Heat Exchanger Primary Heat ExchangerInlet and Outlet Connections Integral Bypass Bypass Valve SynchronizationBypass Piping Assembly Integral CirculatorOptional Intermittent Pump Operation Bypass Initial Set-up of Maximum Water FlowMinimum Water Temperatures Btu/hr Input Temperature RiseTable P Bypass OperationWater Flow Switch Table QLOW Water Cutoff GAS Train and ControlsRelief Valve Diaphragm GAS Valve Ratio GAS ValveJacket Assembly Electrical ConnectionsAccess to Components and Controls Front Control Panel LocationsVariable Frequency Drive Transformer and Relay LocationsExcel High GAS Pressure Switch LOW GAS Pressure Switch OptionalLOW AIR Pressure Switch Be used as a diagnostic indicator Temperature Adjustment Default Values Pre-programmed in the ExcelTable S To Activate the Manual OverridePassword Function Configuring Command DisplayTable T Display Default Values Accessing the SIX Changeable Points from Command DisplayCalculated Set Point Total Run TimeSet Point Temp Sequencing TypeCommand Display Data Screen Status Points Table UStatus Point Operational Modes Hot Surface Igniter OnOutdoor Reset Function Selections Optional on Heating Boilers OnlyMultiple Appliance Installations Efficiency Optimized with Time EqualizationTable W Singly Terminated FTT Network Bus Topology SpecificationsInterfacing Multiple Appliances Wire Termination for E-Bus Connection Additional Components Used to Interface Multiple AppliancesHigh Water Temperature Limit Control Typical Building Management System DiagramIgnition Module Lockout Functions Service PartsHOT Surface Ignition System Diagnostic Status Indication Table YIgnition and Control Timings Table ZOPERATION/DIAGNOSTIC LIGHTS, Resets and Switches IndicatorBurner Table AACombustion AIR Blower Combustion Air Blower and Transition ChamberCondensate Management System OptionalTable BB Condensate Drain Location On RearReplenishing the Neutralizer Condensate TestingCondensate Trap Installation Install Condensate Trap Lighting InstructionsTo Turn OFF GAS to Appliance Ignition System CheckoutSequence of Operation Heat Transfer ProcessMaintenance End of SequenceBurner Removal and Cleaning Burner MaintenanceBurner Cleaning Procedure Location of Primary Heat ExchangerSecondary Heat Exchanger Inspection Lubrication Freeze Protection Heating Boiler Installations Freeze Protection for a Heating Boiler System If RequiredWater Treatment Water Connections Heating Boilers onlyPrimary Loop Circulator Pump Specifications Piping LengthsBoiler Circulator Pump Limitations Circulator Pump OperationMinimum Boiler Water Temperatures PRIMARY/SECONDARY Boiler PipingBoiler Temperature Rise Chart Table DD Table CCMaximum Flow for Heating Boiler Btu/hr Input Maximum FlowPlacing the Boiler Operation TEMPERATURE/PRESSURE GaugeTypical Heating Boiler Installations Boiler Operation Installation with a Chilled Water SystemBoiler Operating Temperature Control Water Velocity Control Typical Water Heater Piping with Storage TankMaximum Flow Rate Btu/hr Input Table EETable FF Water Chemistry Piping Multiple Unit Installations Single Water Heater Piping with Two Storage TanksTable GG Pump OperationHeat Exchanger Common ManifoldThermostat Settings Table HHCathodic Protection Optional Relief ValveThermal Expansion Ladder Diagram PWM Wiring Diagram

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Lochinvar 000, 1 warranty Table Q, Water Flow Switch, LOW Water Cutoff, GAS Train and Controls

TABLE - Q

Minimum Inlet Water Temperatures

Input

Minimum Return

Btu/hr

Temperature

Setpoint

50°F (10°C)

70°F (23.9°C)

WATER FLOW SWITCH

LOW WATER CUTOFF

(If Equipped)

GAS TRAIN AND CONTROLS

FIG. 42 Gas Train Assembly