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Documents & Manuals

Find all the essential guides in one place.

Tensioning Guide
Belt-diagram
C-120 pulleys
+ 13 more

Work Order Templates

Pre-built workflows to keep your asset running smoothly.

Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
+ 29 more

Procedures

Integrate maintenance plans directly into your work orders.

Motion Industries
Applied Industrial Technologies
Electrical Brothers
+ 5 more

Parts

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Drive Motor
B2 Rollers
Tensioning System
+ 40 more

Lochinvar Condensing Boiler OFN1751

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Maintenance Plans for Lochinvar Condensing Boiler Model OFN1751

Integrate maintenance plans directly into your work orders in MaintainX.

Water Chemistry Check

Water Hardness Check

Measure the water hardness in grains per gallon

Is the water hardness between 5 and 12 grains per gallon?

Consult local water treatment companies for hard water areas (above 12 grains per gallon hardness)

pH Level Check

Measure the pH level of the water

Is the pH level between 6.5 and 8.5?

Total Dissolved Solids (TDS) Check

Measure the Total Dissolved Solids (TDS) in ppm

Run this procedure

Flame and Combustion Check

Preparation

Turn the main power off to the boiler by placing the 'On/Off' switch in the OFF position.

Remove the fitting from the flue collector.

Combustion Analysis Setup

Insert the probe from a combustion analyzer into the hole left by the removal of the fitting.

Turn the main power on to the boiler by placing the 'On/Off' switch in the ON position.

Navigate to the Setup Screen from the Home Screen by pressing the SETUP button along the left side of the screen.

Enter the installer password.

Service Mode Activation

Run this procedure

Initial Boiler Cleaning

System Flushing

Flush the entire heating system prior to fill and start-up

System Cleaning

Clean the entire heating system with an approved pre-commissioning cleaner

Follow manufacturer's recommendation for cleaning to remove debris and prolong heat exchanger life

Water Filtering Devices

Clean all water filtering devices in the system

System Refill

Flush the cleaning solution out of the entire system

Run this procedure

Thermostat Circuit Check

Preparation

Disconnect the two external wires connected to the enable terminals on the connection board.

Voltage Check

Connect a voltmeter across the two incoming wires and close each thermostat, zone valve, and relay in the external circuit one at a time. Record the voltmeter reading across the incoming wires.

Is there any voltage reading?

Troubleshooting

If a voltage occurs, was the external wiring checked and corrected?

Final Steps

Reconnect the external thermostat circuit wires to the connection board.

Run this procedure

Water System Check

Fill and Test Water System

Ensure water meets manual requirements before filling system

Close vents and valves

Fill to correct system pressure

Enter the minimum cold water fill pressure