Lochinvar 495 Domestic Water Heaters, Water Velocity Control, Required Temperature Rise, Table Q

Page 36

Hydronic Heating Boilers and Domestic Water Heaters

DOMESTIC WATER

HEATERS

This section applies only to those units used to supply potable hot water for domestic use. The hot water supply boiler must be installed with a storage tank.

This section contains specific instructions for those units used to supply domestic hot water. All warnings, cautions, notes and instructions in the general installation and service sections apply to these instructions. Hot water supply heaters are designed for installation with a properly sized storage tank. The use of a properly sized pump and the control of water velocity, as explained below, are important for correct operation of your water heater.

Water Velocity Control

IMPORTANT: To ensure proper velocity through the heat exchanger, you must regulate the temperature rise across the heat exchanger from inlet to outlet. Do this upon initial installation and periodically recheck. The correct temperature rise across the heat exchanger ensures proper velocity in the tubes. This will yield long life and economical operation from your hot water heater. Excessive lime build up in the tube is caused by too low of velocity through the tubes. Excessive pitting or erosion in the tube is caused by too high of velocity through the tubes. Take care to measure temperature rise and maintain a velocity as follows:

1.With the pump running and the water heater off, the inlet and outlet thermometers should read the same temperatures. If they do not, an adjustment must be made to your final calculation.

2.Turn the water heater “On” and allow time for the temperature to stabilize. Record the difference between the inlet and outlet temperatures. This difference will be the “temperature rise”.

3.Compare the temperature rise on the heater with the required temperature rise in TABLE-Q. Should adjustment be needed, proceed as follows:

If the temperature rise is too high, the water velocity is too low. Check the following:

1.Check for restrictions in the outlet of the water heater.

2.Be sure all valves are open between the water heater and the tank.

3.Check the pump to be sure it is running properly and that the pump motor is running in the proper direction (see arrow on volute housing).

4.Be sure the installed circulation pipes between the water heater and storage tank are not less than 2 1/2" in diameter on models 985,000 - 2,065,000 Btu/hr.

5.Common manifold piping for multiple unit installations will require larger minimum pipe sizes and tank circulating tappings to ensure proper flow. See TABLE-R.

If the temperature rise is too low, the water velocity is too high. Adjust as follows:

1.Slowly throttle the valve on the outlet side of the water heater until the temperature rise is steady at the required temperature rise as noted in TABLE-Q.

2.Sustained high water velocity and low temperature rise may result in pitting or erosion of the copper tubes in the heat exchanger. This is a non-warrantable failure. Temperature rise must be properly adjusted to achieve the specified flow rate.

Required Temperature Rise

Based on heating potable water with a hardness of 5 to 25 grains per gallon and/or total dissolved solids not exceeding 350 ppm, see Water Chemistry, page 37.

TABLE - Q

Temperature Rise Chart

Btu/hr Temperature

Input

Rise °F

495,000 15

645,000 19

745,000 22

985,000 18

1,255,000 23

1,435,000 26

1,795,000 32

2,065,000 37

36

Page 35 Page 37
Image 36
Page 35 Page 37
Contents Domestic Water Heaters Save this manual for future referenceHydronic Heating Boilers and Domestic Water Heaters Safety Information General Product InformationHydronic Heating Boilers and Domestic Water Heaters Product Identification Front and Rear ViewInstallation Clearances from Combustible ConstructionBase for Combustible Floors Outdoor Boiler Installation Hydronic System AntifreezeShut-Down and Draining Pump OperationInstalling Combustion Air Filter Freeze Protection for a Heating Boiler System if requiredCombustion Air Filter Combustion Air Options One OpeningInstallation Venting General InformationExhaust Fans Venting SupportTABLE-A Vent System Options Table BFlue Pipe Sizes TABLE-CConventional Negative Draft Venting Negative DraftFlue Outlet Piping Common Venting SystemsOutdoor Installation Venting Masonry Chimney InstallationsTable D Outdoor Vent KitsOutdoor Vent/Air Inlet Location Outdoor Vent KitGas Pressure Test Gas PipingInput Max Min Connecting Gas Piping to Unit Gas Train and ControlsCombination Gas Valves Checking Gas Supply PressureVenting of Combination Gas Valves Gas Manifold Pressure Adjustment Measuring Gas Supply Pressure at Combination Gas ValveNET Manifold Pressure Regulator Pressure Less Front Chamber PressureWater Flow Switch Low Water CutoffRelief Valve If EquippedTerminal Strip Connection Options Table JNominal AMP Draw Data Water Connections Heating Boilers Only General Plumbing RulesPrimary/Secondary Boiler Piping Low Temperature Return Water Systems Radiant Floor and Snow Melt Heating SystemsInput LTV Valve Kit Btu/hr Installation with a Chilled Water System System Temperature Rise Chart Based on Btu/hr InputTable L 10ºF 20ºF 30ºF 40ºF 50ºF 60ºFTemperature/Pressure Gauge Boiler Flow RateBoiler Bypass Requirements Filling the SystemOperation Lighting InstructionsLocating Temperature Control To Turn Off Gas To ApplianceTemperature Control Settings Table MSet Point Maximum Set Point DeterminationOutdoor Air Reset Option High-Fire OffsetShutdown Outdoor Air Max O.A. MaxTemperature Control Sensors Placement of SensorsBoiler Application Water Heater ApplicationRemote Wire Connection Wire Maximum GaugeHot Surface Igniter and Ignition Control Module Table NDiagnostic Status Indication Hot Surface Ignition Control ModuleIgnition and Control Timings Ignition Module Lockout FunctionsStatus LED Diagnostic Codes Table OTable P Required Temperature Rise Temperature Rise ChartDomestic Water Heaters Water Velocity ControlPipe Sizing Chart Water ChemistryCirculating Pump Table RPotable Hot Water Temperature Control Settings Domestic Water TemperaturesDomestic Water Minimum Pump PerformanceHigh Water Temperature Limit Control Location of Cold Water Supply Piping ConnectionsOptional Relief Valve Thermal ExpansionCleaning Maintenance Flue Gas Passageways Cleaning ProceduresHeat Exchanger Cleaning ElectricalCombustion and Ventilation Air Cleaning and Maintenance Set Up ProcedureAdjustment Procedure 495,000 1,255,000 Btu/hr Models Servicing Hot Surface Igniter and Ignition Module Sequence of Operation Ignition System CheckoutPower Supply ON/OFF Rocker SwitchManual Reset High-Limit Thermostat Safety Device TerminalsElectronic Temperature Controller Ignition ModuleHeat Transfer Process Gas Valves, Burner Schematic Diagram BTU/HRHI-LIMITS PWR SW Main Unit GAS Valves Blower Pressure Switch Wiring Diagram 15AMPSControl 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.

One of the standout features of the Lochinvar 000 - 2,495,065 is its high thermal efficiency, which often exceeds 95%. Utilizing condensing technology, the unit harnesses heat from exhaust gases, allowing it to recover otherwise lost energy, thereby reducing operational costs significantly. This efficiency not only lowers energy bills for users but also lessens the environmental impact by minimizing greenhouse gas emissions.

The Lochinvar 000 - 2,495,065 is equipped with a lightweight stainless steel heat exchanger. This construction ensures exceptional corrosion resistance and longevity, extending the lifespan of the unit while maintaining optimal performance. The stainless steel design also contributes to faster heating times, making it ideal for high-demand environments.

In terms of control technologies, the Lochinvar 000 - 2,495,065 features an intuitive touchscreen interface. This user-friendly design allows for seamless operation, real-time monitoring, and easy adjustments to temperature settings. Additionally, it facilitates remote diagnostics, promoting efficient maintenance and reducing downtime, which is crucial for busy facilities.

For enhanced safety, the Lochinvar 000 - 2,495,065 includes multiple safety mechanisms, such as over-temperature protection, flame safeguard, and leak detection systems. These safety features ensure secure operation and give users peace of mind.

Moreover, the unit is compatible with various fuel sources, including natural gas and propane, making it versatile and adaptable to different infrastructure requirements. This flexibility ensures that the Lochinvar 000 - 2,495,065 can be integrated into various settings, from residential homes to large commercial buildings.

Another significant characteristic is its compact design, allowing for easy installation in tight spaces. The footprint of the Lochinvar 000 - 2,495,065 makes it an ideal solution for applications where space is at a premium, without compromising on performance.

In summary, Lochinvar 000 - 2,495,065 represents a premium choice for water heating solutions, merging advanced technologies, high efficiency, and user-friendly design to cater to a wide range of heating needs while ensuring safety and sustainability.
Top Page Image Contents