Lochinvar 2072, 402 service manual Manual Reset, Inlet Low, Sensor Open, Sensor Shorted

Page 40

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

3 Troubleshooting

Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

The outlet water temperature has exceeded

• Verify setting of adjustable high limit.

 

 

the setting of the adjustable high limit.

• Verify that the system is full of water and that all air

 

 

 

 

has been properly purged from the system.

 

 

 

• Verify that the appliance is piped properly into the

 

 

system. Refer to the Water Connections Section of

Manual Reset

 

the

Installation

and

Operation Manual

for

 

proper piping methods for the Copper-fin.

 

High Limit

 

 

 

• Check 120 VAC to the pump motor on a call for heat.

(Will require a manual

 

reset once condition has

 

If voltage is not present, check wiring leading to the

 

main control board. Replace the main control board if

been corrected. Press

 

 

necessary.

 

 

 

the RESET button on

 

 

 

 

 

 

 

 

 

 

the SMART SYSTEM

 

• If 120 VAC is present on a call for heat and the pump

display to reset.)

 

is not operating, replace the pump.

 

 

 

• If the system pump is a variable speed pump, ensure

 

 

the system flow is not less than the boiler flow.

 

 

 

• Check temperature setting of the main control board.

 

 

• Check resistance of water sensors and compare to

 

 

the tables on page 35 of this manual. Replace the

 

 

sensor if necessary.

 

 

 

 

• Replace outlet sensor or high limit.

 

 

 

 

 

 

The inlet water temperature did not exceed

• Raise temperature setpoint above 130°.

 

 

130° within 15 minutes of ignition.

• Install a 3-way valve or LTV valve per the piping

Inlet Low

 

 

diagram in the Water Connections Section of the

 

 

Installation and Operation Manual.

 

 

 

• Replace the inlet sensor.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

Sensor Open

 

• Check the sensors and

their associated wiring.

 

Repair or replace the sensor or wiring if damaged.

(Will require a manual

 

Either the inlet water, outlet water, system

 

 

 

 

 

reset once the condition

• Measure the resistance of the sensors and compare

has been corrected. Press

supply, system return, or outdoor temperature

the RESET button on the

sensor has been disconnected.

the

resistance to

the tables on page 35 of

this

manual.

 

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

Sensor Shorted

Either the inlet water, outlet water, system

• Check the sensors and their associated wiring.

(Will require a manual

supply, system return, or outdoor temperature

Repair or replace the sensor or wiring if damaged.

reset once the condition

sensor has been shorted.

• Measure the resistance of the sensors and compare

has been corrected. Press

 

the RESET button on the

 

the resistance to the tables on page 35 of this

SMART SYSTEM display

 

manual.

 

 

 

 

 

 

 

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

 

40

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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 What is in this manual? ServiceMaintenance TroubleshootingService Copper-fin displayControl inputs Control outputs General Operation How the appliance operatesHow the control module operates Sequence of operationSequence of operation OUT 123.8F129HTR Postpurge Display panel menu access Display panel parameter access Parameter table a Boiler Operation OnlyAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Temperature settings Viewable and changeable control parametersData logging FunctionsDHW settings Outdoor air reset boiler only Anti-cycling Control modes Building Management System BMS CascadeService Notification Circulation pumpsMaintenance Maintenance and annual startup Service technicianOwner maintenance See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valveInspect/replace hot surface igniter Check all wiring Check control settingsInspect and clean burner Perform start-up and checks2Adjusting air shutter 399,999 750,000 Btu/ hr Models Adjusting combustion air pressure Checking manifold gas pressurePressure Regulator Chamber Adjustment Manifold Review with owner Inspect and clean the heat exchangerOiled bearing circulators Troubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No BurnerOperation Unit DoesResistance Temperature Checking temperature sensorsTemperature Resistance Noisy No PumpOperation Boiler Pump System Pump DHW PumpFlame Sequence Flow SwitchAnti-cycling Error No Flame IgnHSI Current Low Flame CKTAuto Reset No FlameRunning High LimitManual Reset Inlet LowSensor Open Sensor ShortedLouver Proving Tank OpenAPS Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Progr Service Blk Watch Dog ErrorNo Error Stored Low Voltage
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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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In summary, the Lochinvar 2072,502 stands out for its high efficiency, advanced technology, durability, and flexible installation options. It is an ideal choice for those seeking a reliable and technologically advanced water-heating solution that meets the challenges of contemporary heating demands while promoting energy savings and environmental responsibility.
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