Lochinvar 497 - 2067 Temperature control sensors, Boiler application, Water heater application

Page 41

Installation & Service Manual

5 Electrical connections

Temperature control sensors

(continued)

Boiler application

This is a two-stage temperature control that controls the burner ignition, pump, and alarm functions. This temperature controller can measure up to three different sensor inputs, depending upon how the unit is set up. They are as follows:

1.Inlet Water Temperature Sensor

2.Multi-Purpose Temperature Sensor

3.Outside Air Temperature Sensor

Inlet water temperature sensor

This sensor measures the inlet water temperature coming into the unit.

Multi-purpose temperature sensor

This sensor can be used as a system sensor or a tank sensor.

Outdoor air temperature sensor

This sensor is only available on boiler units with an outdoor air reset option. This allows you to tie boiler operation to the outdoor air temperature. As outside temperatures drop, the control will increase the temperature setting of the boiler. As outdoor temperatures rise, the control will decrease the temperature to the selected set point of the boiler. You can set the control to shut the boiler off when a desired outdoor air temperature level is reached.

Remote sensor for pump delay

This appliance is provided with a special thermostat sensor that MUST be field installed. The sensor is shipped loose in the I & O packet. This remote mounted sensor will be the primary water sensor which will inform the appliance's built- in thermostat control. Reading the water temperature at the remote location is required for proper operation of the pump delay option provided with this appliance.

For domestic water heating, the sensor must be installed into a bulbwell on the storage tank. For boiler and hydronic heating, the sensor must be installed in the system piping loop. If the appliance is controlled by a remote sequencer, the sensor must be routed back into the appliance and placed in a bulbwell on the inlet side of the heat exchanger.

The sensor must be connected to two wires provided on the side of the appliance with the water connections (FIG. 5-9). It will be necessary to add additional wire to reach from the appliance to the remote water source. Use twisted pair wire or minimum 18 gauge wire or larger. Reference Table 5C on page 42 for a chart regarding distance versus wire gauge.

Figure 5-9_Remote sensor for pump delay

Standard boiler units are shipped with two sensors; the inlet water temperature sensor and the multi-purpose temperature sensor. The multi-purpose sensor should be used as a system sensor. Boilers with the outdoor air reset option also have an outside air temperature sensor.

Water heater application

Water heater units are shipped with two sensors; the inlet water temperature sensor and the multi-purpose temperature sensor to be used as a tank sensor.

Placement of sensors

Inlet temperature sensor

The inlet water temperature sensor is installed by the factory in new units. The sensor is an immersion style and maintains direct contact with the water.

System sensor

This is used for boiler applications. This sensor will control the boiler operation based upon the water temperature within the building loop.

Tank sensor

This is used in water heating applications. Place the sensor in the water storage tank to measure water temperature. For more information on mounting the sensor, see Remote Mounting of Sensors, page 42.

Outdoor air Temperature sensor

The outside air temperature sensor will only be used for boiler systems. The outside air sensor is optional. You must purchase the sensor from the appliance manufacturer. The sensor comes with a housing that helps protect the sensor from the elements. Mount the air sensor housing under the eve of the roof. Make sure the housing is out of direct sunlight. This will ensure that the sensor will accurately read the true outdoor temperature. For more information on mounting the sensor, see Remote Mounting of Sensors, page 42.

Figure 5-10_Outdoor air reset chart example

FIELD SUPPLIED WIRING

CONNECTION BOARD

SYSTEM/

TANK

SENSOR

REQUIRED IN ORDER FOR PUMP DELAY TO FUNCTION PROPERLY

 

 

 

 

 

 

1

 

 

+

SYSTEM/TANK

 

 

 

 

 

 

2

 

 

+

SENSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

+

B2 INTERMITTENT

 

 

 

 

 

4

 

 

+

B1

LIMITS

 

 

 

 

 

 

 

 

 

 

 

5

 

 

+

A2

CONTINUOUS

 

 

 

 

 

 

 

 

 

 

 

6

 

 

+

A1

LIMITS

 

 

 

 

 

 

 

 

 

 

 

7

 

 

+

2 NO HIGH FIRE

 

 

 

 

 

 

 

 

 

 

 

8

 

 

+

2 C

ENABLE

 

 

 

 

 

 

 

 

 

 

 

9

 

 

+

1 NO LOW FIRE

 

 

 

 

 

10

 

 

+

1 C

ENABLE

 

 

 

 

 

 

 

 

 

 

 

 

61

72

83

94

10 5

41

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Contents Save this manual for future reference What to do if YOU Smell GASContents Please read before proceeding WarrantySpecial instructions Checking equipmentOwner warning Safety informationPrevention of freezing CodesCopper-fin How it works Copper-fin How it works Models 987 2067 Front View Models 987 2067 Rear View Copper-fin =B=R Rating RatingsCopper-fin Specifications Determine unit location InstallationLocating the unit Indoor clearances from combustible constructionShut-down and draining Outdoor boiler installationFreeze protection Pump operationCombustion and Ventilation Air Freeze Protection for a Heating Boiler System if requiredMinimum Recommended Combustion AIR Supply to Equipment Room NumberCombustion air filter 3Combustion air filter Models 497Outside Combustion Air, No Ducts Outside Combustion Air, Using DuctsCombustion Air Options Combustion Air from an Interior Space Exhaust FansGeneral information VentingVenting support Vertical vent termination clearances and locationFlue Pipe Sizes Model Flue Size Vent system optionsBarometric damper location Negative draft Conventional negative draft ventingFlue outlet piping Common venting systemsInspection of a masonry chimney Masonry chimney installationOutdoor vent/air inlet location Outdoor installation ventingOutdoor Vent Kits Model Pump Cover Without Pump Cover Outdoor vent kitGas connections Connecting to gas supply Gas pipingGas pressure test Inlet GAS Pressure Natural ModelGas connection Suggested GAS Pipe Size for Single Unit InstallationsGas train and controls Fittings to Equivalent Straight PipeCombination gas valves GAS Piping Size ChartVenting of combination gas valves Checking gas supply pressure3Measuring gas supply pressure at combination gas valve Gas manifold pressure adjustmentNat. Gas 4Measuring manifold gas pressureWater connections Boiler circulator requirements Pressure Drop ChartWater connections heating boilers only Run Cycle Output Minimum System Load Temp. Rise 8.33 60 Min Minimum boiler water temperaturesLow system water volume System Temperature Rise Chart Low temperature return water systemsRadiant floor and snow melt heating systems LTV Valve Kits Model LTV Valve KITGPM Common Manifold Size Min Models 497 Number of UnitsDiameter Common Manifold Size Min Models 987 Number of Units6Primary/secondary piping of multiple boilers 7Boiler with low temperature bypass 8Primary/secondary piping with buffer tank Typical heating boiler installations Installation with a chilled water systemBoiler flow rate General plumbing rulesBoiler bypass requirements Temperature / pressure gaugeFilling the system Water treatmentElectrical connections Connecting to electrical supplyAMP Draw Data VACTerminal strip connection options BurnersLocating the temperature control Temperature adjustmentTemperature control settings OJ1 OJ2Outdoor reset option Remote sensor for pump delay Temperature control sensorsPlacement of sensors Boiler applicationHot surface ignition system Remote Wire Connection Wire Gauge Max. Allowable LengthRemote mounting of a sensor Hot surface igniter and ignition control moduleIgnition and control timings Diagnostic Status IndicationSequence Constant Ignition Operation and diagnostic lightsStage 2 on SixOFF StartupCheck/control water chemistry Freeze protection when usedFill and test water system Purge air from water systemCheck thermostat circuits Check for gas leaksCheck vent and air piping Start the boilerWater velocity control Domestic water heatersInitial set-up of maximum water flow Maximum Water Flow1Typical water heater piping with storage tank 2Single water heater piping with two storage tanks Models 497 Number of Units Common Manifold Size Min4Multiple water heater piping with multiple storage tanks Pipe Sizing Chart 497 987 Required temperature risePipe size requirements Water chemistryDomestic water temperature Potable hot water temperature control settingsMinimum pump performance Heat exchangerLocation of cold water supply piping connections Optional relief valve High water temperature limit controlThermal expansion Cathodic protectionMaintenance Combustion and ventilation air Adjustment procedure Models 497 Servicing a hot surface igniter and ignition module Sequence of operationIgnition system checkout OverviewEnd of sequence Heat transfer processGlossary Trial for Ignition Ignition Module Function Pump Delay Electronic Thermostat FunctionIgniter Controlled by Ignition Module Hi-Lo Fire RelayLadder diagram DiagramsDiagrams Connection diagram Connection diagram

497 - 2067 specifications

Lochinvar 497 - 2067 is a highly efficient and versatile condensing boiler that is designed to meet the diverse heating needs of residential and commercial applications. Known for its impressive performance and advanced technology, the Lochinvar 497 - 2067 has garnered a reputation as a reliable choice among heating professionals.

One of the standout features of the Lochinvar 497 - 2067 is its impressive thermal efficiency. The boiler boasts an efficiency rating of up to 95% AFUE (Annual Fuel Utilization Efficiency), allowing users to significantly reduce their energy costs while minimizing environmental impact. This efficiency is facilitated by its innovative condensing technology, which captures and reuses heat from exhaust gases for optimal performance.

The Lochinvar 497 - 2067 is equipped with a robust stainless steel heat exchanger designed to handle high temperatures and ensure long-lasting performance. The heat exchanger’s design maximizes heat transfer, while its corrosion-resistant properties guarantee durability over time. This contributes to the boiler's overall longevity and serviceability, reducing the need for frequent replacements.

Control is another critical feature of the Lochinvar 497 - 2067. The boiler comes with an advanced control system that enables easy management of system operations. Users can take advantage of features such as outdoor reset control, which adjusts the temperature of the boiler based on external weather conditions, enhancing system efficiency and comfort.

In terms of safety, the Lochinvar 497 - 2067 incorporates several cutting-edge safety features, including a flame detection system and multiple safety shut-off devices. These safeguards help to ensure the safe operation of the boiler, providing peace of mind to users and heating professionals alike.

Another important characteristic is the compact design of the Lochinvar 497 - 2067, which allows for flexible installation in various settings, including tight spaces. Its lightweight structure further simplifies the installation process, making it a practical choice for contractors.

In summary, the Lochinvar 497 - 2067 is an exceptional high-efficiency condensing boiler that combines advanced technology, durability, and ease of use. With its impressive thermal efficiency, superior heat exchanger design, advanced control systems, and enhanced safety measures, it stands out as a top choice for those seeking reliable heating solutions. This boiler not only meets but exceeds modern demands for energy efficiency and performance, solidifying its position in the market.
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