Lochinvar CF-CH(E)-i&s-08, 399 Water Velocity Control, Required Temperature Rise, Water Chemistry

Page 52

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 little velocity through the tubes. Excessive pitting or erosion in the tube is caused by too much 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 boiler 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–W. 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" in diameter on 399,999 - 750,000 Btu/hr models and 2 1/2" in diameter on 990,000 - 2,070,000 Btu/hr models.

5.Common manifold piping for multiple unit installations will require larger minimum pipe sizes and tank circulating tappings to ensure proper flow. See TABLE–X, page 53.

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–W.

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 52.

TABLE-W

 

Temperature Rise Chart

TABLE–U

Btu/hr

Temperature

 

Input

Rise oF

 

399,999 12

500,000 15

650,000 20

750,000 23

990,000 19

1,260,000 24

1,440,000 27

1,800,000 34

2,070,000 39

Water Chemistry

The required temperature rise and the standard pump sizing are based on the heating of potable water with a hardness of 5 to 25 grains per gallon and a total dissolved solids not exceeding 350 ppm. Consult the appliance manufacturer when heating

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Contents Domestic Water Heaters Hydronic Heating Boilers and Domestic Water Heaters General Product Information UnpackingSafety Information Installation Installation Clearances from Combustible ConstructionOutdoor Boiler Installation LocationFreeze Protection Pump OperationShut-Down and Draining Freeze Protection for a Heating Boiler System if requiredCombustion and Ventilation AIR Combustion Air FilterCombustion Air Options Outside Combustion Air, No DuctsCombustion Air from Interior Space Venting Exhaust FansGeneral Information Vertical Vent Termination Clearances and LocationSidewall Vent Termination Clearances and Location ChimneyLength of Air Inlet Pipe Combustion Air Inlet PipingSidewall Air Inlet Vertical Rooftop Air Inlet ClearancesCombined Air Inlet Points Vent System OptionsBarometric Damper Location Negative Draft Conventional Negative Draft VentingFlue Outlet Piping Vertical DirectAire Venting Vertical Vent Termination Clearances and LocationInstallation Vent Kits Venting of Flue ProductsSidewall Venting Sidewall FanSidewall Venting Termination Sidewall Venting Without FanVenting Guidelines Masonry Chimney Installation Horizontal DirectAire VentingVent Kits Direct VentingVertical DV Venting Termination Connecting the Air Inlet Pipe to the Unit Horizontal DV Venting TerminationFlue Pipe Materials Combustion Air Inlet PipingAir Inlet Piping Materials Sealing PVC, CPVC, ABS, Dryer Vent, and Flex Duct Vent PipeOutdoor Installation Venting MaximumOutdoor Vent/Air Inlet Location Outdoor Vent Cap KitConnecting to GAS Supply Connecting Gas Piping to UnitGas Piping Gas Pressure TestGas Train and Controls TABLE-JBtu/hr Distance From Meter in feet Input 51-100 101-200 201-300 301-500Checking Gas Supply Pressure Combination Gas ValvesVenting of Combination Gas Valves Multiple Unit Installations Gas Supply Pipe Sizing Gas Manifold Pressure AdjustmentTable L Connecting to Water Supply Relief Valve Water Flow SwitchLow Water Cutoff Water Connections Heating Boilers Only General Plumbing RulesCirculator Pump Requirements Heat Exchanger Pressure Drop Chart Circulator Pump SpecificationsPump Installation and Maintenance Primary/Secondary Boiler PipingTable O LTV Valve Kits Low Temperature Return Water SystemsInput LTV Valve Kit Btu/hr Radiant Floor and Snow Melt Heating Systems 10ºF 20ºF 30ºF 40ºFTemperature/Pressure Gauge Boiler Flow RatePlacing the Boiler in Operation Boiler Bypass RequirementsInstallation with a Chilled Water System Boiler Operating Temperature ControlWater Treatment Terminal Strip Connection OptionsFor Your Safety Read Before Operating Remote ON/OFF Boiler or Water HeaterOperation Power Up Quick Programming OverviewTo Turn Off Gas To Appliance Standard Btu/hr ModelsAdjust Menu Setting Descriptions Adjust Menu Settings for Operating ModesTABLE-Q TABLE-ROperating Modes Ignition Systems and StagesProgramming Buttons Temperature Control Access LevelsPlacement of Sensors Programming For Mode 1, Boiler Operation Graphic SymbolsStaging Logic Programming For Mode 2, Water Heating Operation Programming For Mode 3, Sequenced OperationRemote Mounting of Sensors TABLE-SError and Warning Messages HOT Surface Ignition SystemHot Surface Igniter and Ignition Control Module Hot Surface Ignition Control ModuleDiagnostic Status Indication Access to Internal Control PanelIgnition Control Diagnostic Codes Removing the Control PanelOperation and Diagnostic Lights Status LED Diagnostic CodesIgnition and Control Timings Hot Surface Ignition Module Timings NominalRequired Temperature Rise Temperature Rise ChartWater Velocity Control Water ChemistryPipe Size Requirements Circulating PumpTABLE-X 399,999 750,000 Btu/hr ModelsPotable Hot Water Temperature Control Settings Minimum Pump PerformanceHeat Exchanger TABLE-YHigh Water Temperature Limit Control Optional Relief ValveThermal Expansion Location of Cold Water Supply Piping ConnectionsFlue Gas Passageways Cleaning Procedures Burner Removal and CleaningAppliance Area Water Circulating PumpElectrical Heat Exchanger CleaningCombustion and Ventilation Air Set Up Procedure Adjusting Differential Air PressureAdjustment Procedure Servicing Hot Surface Igniter and Ignition Module Ignition System CheckoutSequence of Operation Ignition Troubleshooting Guide 990,000 2,070,000 Btu/hr Models Domestic Water Heaters Hydronic Heating Boilers Ladder Diagram 399,999 750,000 BTU/HR Models Hydronic Heating Boilers and Domestic Water Heaters Installation Ladder Diagram 990,000 2,070,000 BTU/HR Models Models Wiring Diagram Hydronic Heating Boilers and Domestic Water Heaters BTU/HR Models
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399, CF-CH(E)-i&s-08, 999 - 750 specifications

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