Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Operation

Page 40

Commercial Pool Heaters

OPERATION Continued

Figure 44 – Vertical Pool Heater Piping

Figure 45 – Horizontal Pool Heater Piping

OPERATING TEMPERATURE CONTROL

The pool heater is equipped with a microprocessor based adjustable digital temperature control to provide ON/OFF operation. The temperature control is located behind the overlay on the front of the control panel. Operation is based on temperature inputs from immersion sensors, and, if desired, an external thermostat. The temperature control will turn on and off based upon the temperature measured by the pool return sensor. This sensor is factory installed in a bulbwell located in the inlet piping to the pool heater, upstream of the 3-way automatic bypass valve. The temperature control will turn on and off based upon an external thermostat connected between terminals R1 and W1 on the terminal board. The temperature control will also turn off if the temperature measured by the pool heater output sensor exceeds a limit (default = 200°F) or if the temperature measured by the optional pool supply sensor exceeds another limit (default = 100°F). In addition, the temperature control will operate a factory installed 3-way automatic bypass valve. This is done to maintain a minimum temperature at the inlet to the pool heater (default = 130°F), automatically protecting the pool

heater from condensation of the flue products. If the boiler inlet temperature is not satisfied within 15 minutes the controller will shut the unit down. To reset the unit, press any key. No manual valve adjustments are required.

An LCD is provided to display various readings and operating parameters. Three (3) pushbuttons are available to change the display and to program parameters (Figure 46).

Figure 46 - Temperature Control Display and Programming Keys

Specifications

•Set Point Adjustment Range:

OFF, 55°F up to 105°F (13°C up to 41°C).

•Differential Adjustment Range: 1°F up to 20°F (1°C-11°C)

•Temperature Accuracy: +/- 1°F.

•Display Resolution: 1°F via Liquid Crystal Display (LCD).

•Sensor: NTC Thermistor, 10k ohms @ 77°F (25°C).

•Operating Humidity: < 90% RH Non-condensing.

•Operating Ambient Temperature: -20° to 140°F (-30° to 60°C).

The programming keys are as follows:

Select - Allows the user to select the reading or parameter being displayed. Each time the key is pressed, a different indicator will appear which describes the value being shown. These are detailed as follows:

Up and Down Arrows - While in the Adjust mode, the user can increase or decrease the parameter being shown.

The default display mode is the View mode, indicated in the upper right-hand corner of the display.

The default value shown is the Pool Temperature, indicated by the arrow pointing to the POOL text on the overlay. If the

40

Page 39 Page 41
Image 40
Page 39 Page 41
Contents GAS Heaters for Commercial Pool Applications Commercial Pool Heaters General Product Information UnpackingCommercial Pool Heaters Product Identification Clearances from Combustible Construction Base for Combustible FloorsFreeze Protection Combustion Air FilterInstallation Combustion Air OptionsExhaust Fans Combustion Air from Interior SpaceVenting Support General InformationVertical Vent Termination Clearances and Location Sidewall Vent Termination Clearances and Location Table BLength of Air Inlet Pipe Combustion Air Inlet PipingSidewall Air Inlet Vertical Rooftop Air Inlet Combined Air Inlet PointsConventional Negative Draft Venting Vent System OptionsNegative Draft Flue Outlet Piping Masonry Chimney InstallationsCommon Venting Systems Vertical DirectAire Venting Inspection of a Masonry ChimneySidewall Venting Vent KitsVenting of Flue Products Sidewall Venting Termination Sidewall FanSidewall Venting Without Fan Masonry Chimney Installation Horizontal DirectAire Venting TABLE-EDirect Venting Flue Pipe Materials Horizontal DV Venting TerminationCombustion Air Inlet Piping Air Inlet Piping Materials Length of Air Inlet PipeSealing Type-B Doublewall Vent Pipe or Galvanized Vent Pipe Combined Combustion Air Inlet Points Vertical Rooftop Air InletOutdoor Installation Venting Outdoor Vent/Air Inlet LocationCombustion Air Fan Adjustment for startup 3-Way Valve Cover InstallationGas Pressure Test Outdoor Vent Cap KitGas Piping Connecting Gas Piping to the Pool HeaterGas Train and Controls Combination Gas Valves Venting of Combination Gas ValvesChecking Gas Supply Pressure TABLE-JMultiple Unit Installations Gas Supply Pipe Sizing Table KGas Manifold Pressure Adjustment Measuring Net Manifold Gas PressureAuxiliary Mixed Water Limit Control Pumped Automatic BypassWay Valve Cover Heater is Within 15 Feet of Pool Piping Heaters are within 15 feet Perpendicular of Pool Piping Relief Valve Water Flow SwitchAutomatic Chlorinator and Chemical Feeders Service Indicator Option Pump Purge Delay OptionWay Automatic Bypass Valve Wiring Terminal Strip Connection Options TABLE-MOperation Lighting InstructionsTo Turn Off Gas To Pool Heater Pre-Start ChecklistStarting the Filter System Operation Programming Mode Error Messages Displayed by the Temperature ControllerDiagnostic Status Indication Hot Surface Igniter and Ignition Control ModuleHot Surface Ignition Control Module Ignition Module Lockout FunctionsTABLE-N Access to Internal Control PanelIgnition and Control Timings Water Chemistry TABLE-OTABLE-P Test Recommended LevelPipe Size Requirements Circulating PumpMinimum Pump Performance Heat ExchangerHigh Water Temperature Limit Control Flue Gas Passageways Cleaning ProceduresAppliance Area Water Circulating PumpBurner Removal and Cleaning Heat Exchanger CleaningElectrical Combustion and Ventilation AirAdjusting Differential Air Pressure Fan CleaningCombustion Air Fan Adjustment Set-Up ProcedureServicing Hot Surface Igniter and Ignition Module Adjustment ProcedureIgnition System Checkout Sequence of Operation Glossary Prepurge Wiring BOX Connections Wiring BOX Connections Ladder Diagram Control BOX Connections Commercial Pool Heaters Appendix a Appendix B View Menu Item Menu Description
Top Page Image Contents