Lochinvar 502 - 2072, 402 - 2072 service manual DHW settings

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

1 Service (continued)

D5: 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. This temperature can be adjusted by using parameter D5. The range of this parameter is 32°F (0°C) to 104°F (40°C). The default value is 45°F (7°C).

D6: 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. This second temperature can be adjusted by using parameter D6. The temperature range of this parameter is 32°F (0°C) to 104°F (40°C. The default value is 37°F (3°C).

D7: 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. This temperature differential can be adjusted using parameter D7. The temperature range of this parameter is 0° to 72°F (40°C). The default temperature is 5°F (3°C).

E4: 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 parameter E4. 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.

E5: Tank offset (water heater only)

The tank offset is the number of degrees the DHW tank temperature must go above the tank set point before the water heater will turn off. To adjust this value, access parameter E5. The temperature range of this parameter is 0° to 10°F (5°C). The default value is 4°F (2°C).

E6: Tank differential

The tank differential is the number of degrees the DHW tank temperature must go below the tank set point before the heater or boiler will start to heat the DHW tank. To adjust this value, access parameter E6. The temperature range of this parameter is 0° to 40°F (22°C). The default value is 6°F (3°C).

E:DHW settings

E1: DHW tank set point

When a temperature sensor is installed in the DHW tank, the DHW tank set point sets the target temperature of the water in the tank. The user or installer can adjust this set point by accessing parameter E1. The temperature range of this parameter is 60°F (15°C) to 190°F (88°C). The default value is 120°F (49°C).

E2: DHW boiler set point (boiler only)

When an indirect DHW call for heat becomes active, the control will use the DHW boiler set point to determine the firing rate of the unit based on the actual outlet water temperature. This parameter can be changed by the installer by accessing parameter E2. The temperature range of this parameter is 32°F (0°C) to 261°F (127°C). The default value is 180°F (82°C).

E3: 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. The time that the control services the SH demand before switching to the DHW demand can be adjusted by using parameter E3. 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, Water Heater Pool Heater Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials Service What is in this manual?Maintenance TroubleshootingCopper-fin display ServiceControl inputs Control outputs How the appliance operates General OperationHow the control module operates Sequence of operationOUT 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 NotificationService technician Maintenance Maintenance and annual startupOwner maintenance See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterCheck control settings Check all wiringInspect and clean burner Perform start-up and checksChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Oiled bearing circulators Inspect and clean the heat exchangerReview with owner Before troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature Resistance Checking temperature sensorsResistance Temperature No Pump NoisyBoiler Pump System Pump DHW PumpAnti-cycling Flow SwitchFlame Sequence No Flame Ign ErrorHSI Current Low Flame CKTNo Flame Auto ResetRunning High LimitInlet Low Manual ResetSensor Open Sensor ShortedTank Open Louver ProvingAPS Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Service BlkProgr Low VoltageNo Error Stored Watch Dog ErrorWrite EEProm Program 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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