Lochinvar 502 - 2072 Viewable and changeable control parameters, Temperature settings boiler only

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Copper-fin II/IIE Boiler, Water Heater and Pool Service Manual

1 Service (continued)

Viewable and changeable control parameters

CAUTION Before changing parameters, note the settings so that the unit can be returned to

its original operating parameters.

A: General

A1: User code

The User Code allows the user to access and change a limited number of control parameters. The access code can be changed by the user or the installer to a code of their choosing. To change the code, parameter A1 must be accessed. The default code is 0704. The code can be changed one digit at a time by using the arrow keys on the display.

A2: Date and time

The control uses an internal clock for the night setback feature and for logging of events. For these features to work correctly, the clock must be set when the unit is first installed or any time the unit has been powered off for more than 30 days. To set the clock, parameter A2 must be accessed. The date and time are displayed as “YY:MM:DD W hh:mm”. YY = year, MM = month, DD = date, W = day (1 = Monday, 2 = Tuesday, etc.), hh = hour (24 hour time; 2:00 PM = 14:00), mm = minutes.

NOTICE

The internal clock does not adjust for

Daylight Savings Time and therefore, will

 

require a manual adjustment.

A3: Software version

The software version allows the user to view the software version in use by the control. This software controls the operation of the unit. When a new software version becomes available, the existing control can be replaced with a new control to update the software.

A4: Temperature units

The control can be configured to display temperature in either °C or °F. This parameter can be changed by the user or the installer by accessing parameter A4. The default is °F.

A5: SH Night setback offset

Once the internal clock has been set correctly, the SH night setback feature can be used to program a lower set point. The value of this parameter will be subtracted from the normal set point to determine the set point used during night setback. This parameter can be changed by the user or the installer by accessing parameter A5. The temperature range for this parameter is 0°F to 90°F (50°C). The feature is turned off with a setting of 0°F. The default value is 0°F.

A6: SH Night setback times

If parameter A5 is set to anything other than 0°F, the night setback feature becomes active. This will require start and stop times to be programmed for the days that reduced temperatures are required. These times can be changed by the user or the installer by accessing parameter A6. Each day of the week (Monday through Sunday) will have an on and off time.

Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you wish to skip a day and have no night setback, set the on and off times to the same time, and prior to 12:00 p.m. To keep night setback active through the entire day, set the on and off time to the same time, and after 12:00 p.m. The default times for each day will be 08:00 (OFF) and 18:00 (ON).

A7: DHW Night setback offset

Once the internal clock has been set correctly, the DHW night setback feature can be used to program a lower SH set point during various times of the week. The value of this parameter will be subtracted from the normal set point to determine the set point used during night setback. This parameter can be changed by the user or installer by accessing parameter A7. The temperature range for this parameter is 0°F to 90°F (50°C). The default value is 0°F.

A8: DHW Night setback times

If parameter A7 is set to anything other than 0°F, the DHW night setback feature becomes active. This will require start and stop times to be programmed for the days that reduced temperatures are required. These times can be changed by the user or the installer by accessing parameter A8. Each day of the week (Monday through Sunday) will have an on and off time. If you wish to skip a day, set the on and off times to the same time, and prior to 12:00 p.m. To keep night setback active through the entire day, set the on and off times to the same time and after 12:00 p.m.

B:Temperature settings (boiler only)

B1: SH Set point user

The SH set point user sets the water temperature or pool temperature set point for fixed operation, or the maximum temperature set point when the outdoor air sensor is used. This parameter can be changed by the user or the installer by accessing parameter B1. The temperature range of this parameter is 60°F (15°C) to 230°F (110°C). The default value is 80°F (27°C).

B2: SH Minimum set point

The SH minimum set point sets the minimum water temperature set point that can be used for space heating and pool heater operation. The user or installer will not be able to program the control with a lower SH set point. This parameter can only be changed by the installer by accessing parameter B2. The temperature range of this parameter is 32°F (0°C) to 230°F (110°C) (space heating) or 32°F (0°C) to 105°F (40°C) (pool heater). The default value is 70°F (21°C).

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Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid Troubleshooting What is in this manual?Service MaintenanceCopper-fin display ServiceControl inputs Control outputs Sequence of operation General OperationHow the appliance operates How the control module operatesOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Parameter table Datalogging Functions Settingsdhw ResetoutdoorAnti-cycle Delay Yes Viewable and changeable control parameters Temperature settings boiler onlyFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterPerform start-up and checks Check all wiringCheck control settings Inspect and clean burnerChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Inspect and clean the heat exchanger Review with ownerOiled bearing circulators Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationChecking temperature sensors Resistance TemperatureTemperature Resistance DHW Pump NoisyNo Pump Boiler Pump System PumpFlow Switch Flame SequenceAnti-cycling Flame CKT ErrorNo Flame Ign HSI Current LowHigh Limit Auto ResetNo Flame RunningSensor Shorted Manual ResetInlet Low Sensor OpenAPS Closed Louver ProvingTank Open APS OpenRem Ctrl Flt Temp O/ShootLow Voltage Service BlkParameters ProgrProgram EEProm Watch Dog ErrorNo Error Stored Write EEProm
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502 - 2072, 402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

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