Lochinvar 065, 495 Outdoor Air Reset Option, High-Fire Offset, Shutdown, Outdoor Air Max O.A. Max

Page 31

Installation and Service Manual

High-Fire Offset

The temperature control operates a two-stage firing system. The two stages are High-Fire and Low-Fire. High-Fire operates all burners while Low-Fire operates approximately one-half of the burners.

The High-Fire knob specifies the number of degrees below set point that the High-Fire stage shuts down. At that point, the unit will continue to operate at the Low-Fire stage until the set point is reached.

The High-Fire offset knob has settings between 0°F and 20°F. If set at 0°F, the High-Fire offset is disabled and the unit will operate at the High-Fire stage until the set point is reached and the temperature control shuts the unit off.

When the High-Fire offset knob is set to 0 or 1, the unit will light at Low Fire and operate for approximately 10 seconds before the High-Fire stage actuates. When set to 2 or above, the unit will operate at Low Fire for 2 minutes before the High Fire stage actuates.

Outdoor Air Reset Option

For boilers ordered with the Outdoor Air Reset option, there is an additional control (see Figure 36). There are three setting knobs for Shutdown, Outdoor Air Max., and Ratio. There is also a switch to turn the outdoor air sensor On or Off. An O.A. Sensor is also included.

Shutdown

The Shutdown knob specifies the outdoor air lockout temperature at which the control would prevent the unit from operating. This feature can be enabled/disabled with the O.A. Shutdown switch.

Outdoor Air Max (O.A. Max)

The O. A. Max knob allows a reset up to the maximum outdoor air temperature specified by this knob setting. When the outdoor air temperature is above the specified setting, the unit will not function in the O.A. Reset Mode, but will continue to run at the selected set point temperature.

Note that the set point knob will now indicate the “minimum” boiler temperature. Target temperature is determined by the ratio and outdoor air temperature below the O.A. Max setting.

Ratio

The Ratio knob allows the control over the reset ratio to be used during Outdoor Air Reset. The allowable ratios are as low as 0.5:1 or as high as 1.5:1.

Selecting the 0.5:1 ratio will increase the set point 0.5°F for every 1.0°F drop in outdoor air temperature up to the maximum set point temperature.

Selecting the 1.5:1 ratio will increase the set point 1.5°F for every 1.0°F drop in outdoor air temperature up to the maximum set point temperature.

See Figure 37 for an outdoor air reset chart example.

(c)2002 L.C.

55

 

 

CN1

 

 

CN2

 

CN3

 

 

 

 

 

 

 

 

 

 

OJ1

CN7

 

50

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D4

 

65

O.A. SENSOR

 

 

 

 

 

CN4

C10

CN8

 

 

ON ENABLE

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

VR3

 

 

SW1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

70

 

DISABLE

 

 

 

 

 

 

 

 

W1

O.A. SHUTDOWN

 

 

 

 

 

CN5

OJ2

 

SHUTDOWN

 

 

 

 

 

 

 

 

 

 

 

 

R6

R4

C7

 

 

 

 

55

 

 

 

1.0

 

 

 

C9

 

 

 

 

0.9

 

 

 

 

 

CN6

 

 

50

60

 

1.1

 

 

 

 

 

 

 

 

0.8

1.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45

65

0.7

 

1.3

 

 

 

J4

 

 

 

 

 

 

 

 

 

 

W3

 

 

 

 

 

VR1

 

0.6

VR2

1.4

 

 

 

R8

 

 

 

 

 

0.5

 

 

 

 

 

 

 

 

40

70

 

1.5

 

 

 

 

 

CN1

 

 

 

W1

W2

 

 

 

 

O.A. MAX.

 

RATIO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN9

 

160

 

 

 

10 11

 

 

 

 

 

 

 

200

9

 

 

 

10

 

 

140

 

8

 

12

 

 

 

 

 

 

 

 

 

 

 

R15

R16

5

 

 

15

 

 

 

 

7

 

13

 

 

 

 

 

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120

 

 

6

 

14

 

 

 

 

 

 

 

 

 

 

5

VR2

15

 

(F-)0

VR3

20

 

 

 

240

 

 

 

 

OFF

DIFFERENTIAL

 

 

HIGH-FIRE

 

 

SETPOINT

 

TST2314

 

 

 

OFFSET

 

Figure 36 - Optional Outdoor Air Reset Control

31

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Contents Save this manual for future reference Domestic Water HeatersHydronic Heating Boilers and Domestic Water Heaters General Product Information Safety InformationHydronic Heating Boilers and Domestic Water Heaters Front and Rear View Product IdentificationClearances from Combustible Construction InstallationBase for Combustible Floors Pump Operation Outdoor Boiler InstallationHydronic System Antifreeze Shut-Down and DrainingFreeze Protection for a Heating Boiler System if required Installing Combustion Air FilterCombustion Air Filter One Opening Combustion Air OptionsVenting Support Installation VentingGeneral Information Exhaust FansTABLE-A TABLE-C Vent System OptionsTable B Flue Pipe SizesCommon Venting Systems Conventional Negative Draft VentingNegative Draft Flue Outlet PipingMasonry Chimney Installations Outdoor Installation VentingOutdoor Vent Kit Table DOutdoor Vent Kits Outdoor Vent/Air Inlet LocationGas Piping Gas Pressure TestInput Max Min Gas Train and Controls Connecting Gas Piping to UnitChecking Gas Supply Pressure Combination Gas ValvesVenting of Combination Gas Valves Measuring Gas Supply Pressure at Combination Gas Valve Gas Manifold Pressure AdjustmentRegulator Pressure Less Front Chamber Pressure NET Manifold PressureIf Equipped Water Flow SwitchLow Water Cutoff Relief ValveTable J Terminal Strip Connection OptionsNominal AMP Draw Data General Plumbing Rules Water Connections Heating Boilers OnlyPrimary/Secondary Boiler Piping Radiant Floor and Snow Melt Heating Systems Low Temperature Return Water SystemsInput LTV Valve Kit Btu/hr 10ºF 20ºF 30ºF 40ºF 50ºF 60ºF Installation with a Chilled Water SystemSystem Temperature Rise Chart Based on Btu/hr Input Table LFilling the System Temperature/Pressure GaugeBoiler Flow Rate Boiler Bypass RequirementsLighting Instructions OperationTo Turn Off Gas To Appliance Locating Temperature ControlMaximum Set Point Determination Temperature Control SettingsTable M Set PointOutdoor Air Max O.A. Max Outdoor Air Reset OptionHigh-Fire Offset ShutdownWater Heater Application Temperature Control SensorsPlacement of Sensors Boiler ApplicationTable N Remote Wire ConnectionWire Maximum Gauge Hot Surface Igniter and Ignition Control ModuleIgnition Module Lockout Functions Diagnostic Status IndicationHot Surface Ignition Control Module Ignition and Control TimingsTable O Status LED Diagnostic CodesTable P Water Velocity Control Required Temperature RiseTemperature Rise Chart Domestic Water HeatersTable R Pipe Sizing ChartWater Chemistry Circulating PumpMinimum Pump Performance Potable Hot Water Temperature Control SettingsDomestic Water Temperatures Domestic WaterThermal Expansion High Water Temperature Limit ControlLocation of Cold Water Supply Piping Connections Optional Relief ValveFlue Gas Passageways Cleaning Procedures Cleaning MaintenanceElectrical Heat Exchanger CleaningCombustion and Ventilation Air Set Up Procedure Cleaning and MaintenanceAdjustment Procedure 495,000 1,255,000 Btu/hr Models Servicing Hot Surface Igniter and Ignition Module Ignition System Checkout Sequence of OperationSafety Device Terminals Power SupplyON/OFF Rocker Switch Manual Reset High-Limit ThermostatIgnition Module Electronic Temperature ControllerHeat Transfer Process Gas Valves, Burner BTU/HR Schematic DiagramHI-LIMITS PWR SW Main Unit GAS Valves Blower Pressure Switch 15AMPS Wiring DiagramControl BOX Connections Control BOX Connections

000 - 2, 065, 495 specifications

Lochinvar 000 - 2,495,065 is a cutting-edge water heating solution designed to meet the needs of modern residential and commercial applications. This high-efficiency unit combines advanced engineering with robust technologies, providing unmatched performance and reliability.

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