Test in – Test Out

When performing a diagnostic it is important to fully diagnose the issue. Here is a way to ensure a correct diagnosis and to avoid expensive callbacks. It is called Test in, Test out. Before you replace a part, test it to make sure it does not meet or exceed the standards set forth by the manufacturer. Once the part is replaced, test it again to make sure the readings are better. For example: If an inducer is pulling .7”WC and the pressure switch closes at .5”, and is not closing, the switch would be the logical part to change. Once you replace the faulty switch, retest it to ensure the switch is closing at the specified rating. This extra test now verifies that you correctly diagnosed the problem. As always, if you need technical assistance please feel free to call one of our technical specialists.

Jeff Rosenblum
Technical Support
14 Years Industry Experience
Cell (330) 962-2491
jrosenblum@famous-supply.com

The Right Tools for the Job

Nowadays, newer furnaces require the proper tools for efficient and correct diagnostics.

The days of an analog meter and a book of matches are gone. New, more efficient furnaces, boilers, oil furnaces and air conditioners require the technician to have the proper diagnostic tools. Using the right tools will help the technician diagnose the problem faster and avoid costly callbacks. Some tools that are commonly used are:

  • Digital Multimeter Capable of Reading Volts, Ohms, Amps, Micro Amps, Millivolts, Capacitance and Hertz By properly using this type of meter you can diagnose problems such as poor flame signal, switches not closing, open safeties, poor motor performance, failing igniters and more.
  • Digital Dual Port Manometer for Testing Pressure Switches and Air Flow This is an often-overlooked tool that should be in every toolbox. A dual port manometer will allow you to test pressure switches to see if that is the reason for the issue. You can also test airflow in the furnace to see if it is set up right. This also helps diagnose issues in the duct system so that new furnace can perform the way it is supposed to.
  • Combustion Analyzer for Setting up and Diagnosing the Firing Rate This helps you set up the furnace correctly. By using this it can help you diagnose combustion issues, set up an oil burner and will also check to make sure the furnace is burning safely and efficiently.

Jeff Rosenblum
Technical Support
14 Years Industry Experience
Cell (330) 962-2491
jrosenblum@famous-supply.com

Specifying a Generator for Use

With cold weather upon us now there will be time when customers will lose power to their homes and will try to operate their furnaces with a generator. We receive calls whenever the weather turns bad that the furnace does not operate even when there is 110 volts present and the generator has a sufficient wattage output to operate the load. In some cases the generator may damage the controls on the unit.

The following requirements must be kept in mind when specifying a generator for use with this equipment.

  • The furnace requires 120 volts ± 10%
    (Range: 108 volts to 132 volts).
  • The furnace operates at 60 Hz ± 5%
    (Range: 57 Hz to 63 Hz).
  • The furnace’s integrated control requires both polarity and proper Both polarity and ground should be checked before attempting to operate the furnace on either permanent or temporary power.
  • Generator should have a wave form distortion of less than 5% total harmonic distortion (THD).

Jeff Rosenblum
Technical Support
14 Years Industry Experience
Cell (330) 962-2491
jrosenblum@famous-supply.com

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