Lochinvar 402, 2072 service manual DHW settings

Page 19

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

1 Service (continued)

Freeze protection pump on

In order to prevent the water in the heater from freezing, the SMART SYSTEM control turns on the boiler pump whenever the inlet temperature goes below the minimum temperature. The range of this parameter is 32°F (0°C) to 104°F (40°C). The default value is 45°F (7°C).

Freeze protection burner on

If the inlet temperature continues to drop after strating the pump (see Freeze Protection Pump On), and the inlet temperature goes below a second minimum temperature, the first stage will fire. The temperature range of this parameter is 32°F (0°C) to 104°F (40°C. The default value is 37°F (3°C).

Freeze protection differential

Once the pump has turned on, this parameter determines how much the inlet temperature must rise before the pump turns off. Similarly, once Stage 1 has turned on, this parameter also determines how much the inlet temperature must rise before Stage 1 turns back off. The temperature range of this parameter is 0° to 72°F (40°C). The default temperature is 5°F (3°C).

DHW/SH switching time (boiler only)

The time that the SMART SYSTEM control services a DHW demand before returning to the SH demand is set by this parameter. The range of this parameter is 0 to 240 minutes. Setting this parameter to 0 disables the switching function. The default value of this parameter is 30 minutes.

DHW Tank offset (water heater only)

The tank offset is the number of degrees the DHW tank temperature must go above the tank setpoint before the water heater will turn off. The temperature range of this parameter is 0° to 10°F (5°C). The default value is 4°F (2°C).

DHW Tank differential

The tank differential is the number of degrees the DHW tank temperature must go below the tank setpoint before the heater or boiler will start to heat the DHW tank. The temperature range of this parameter is 0° to 40°F (22°C). The default value is 6°F (3°C).

DHW settings

DHW tank setpoint

When a temperature sensor is installed in the DHW tank, the DHW tank setpoint sets the target temperature of the water in the tank. The temperature range of this parameter is 60°F (15°C) to 190°F (88°C). The default value is 120°F (49°C).

DHW boiler setpoint (boiler only)

When an indirect DHW call for heat becomes active, the control will use the DHW boiler setpoint to determine the firing rate of the unit based on the actual outlet water temperature. The temperature range of this parameter is 32°F (0°C) to 261°F (127°C). The default value is 180°F (82°C).

SH/DHW switching time (boiler only)

When a SH call for heat and a DHW call for heat are present at the same time, the SMART SYSTEM control can switch back and forth between the two calls. This parameter determines the maximum length of time the boiler will service the SH call before switching to the DHW call. The range of this parameter is 0 to 240 minutes. Setting this parameter to 0 disables the switching function. The control will service the DHW demand until it ends, then return to the SH demand (if active). The default value of this parameter is 30 minutes.

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Contents Copper-fin II/IIE Boiler and Water Heater Models 402 Contents Handling ceramic fiber materials Please read before proceedingNiosh 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 Only Parameter table a Boiler OperationAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Viewable and changeable control parameters Temperature settingsFunctions 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 valveInspect/replace hot surface igniter Perform start-up and checks Check all wiringCheck control settings Inspect and clean burner2Adjusting air shutter 399,999 750,000 Btu/ hr Models Checking manifold gas pressure Adjusting combustion air pressurePressure Regulator Chamber Adjustment Manifold Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance DHW Pump NoisyNo Pump Operation Boiler Pump System PumpFlame Sequence Flow SwitchAnti-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/ShootParameters Progr Low Voltage Service BlkWatch Dog Error No Error Stored
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402, 2072 specifications

Lochinvar 2072,502 is an innovative and robust water-heating solution tailored for residential and commercial applications. This model represents a significant advancement in energy efficiency and performance, catering to the dynamic heating requirements of modern buildings.

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