Technical Service

Articles about technical service and service tips

Lennox Announces Guidelines For Flood Damaged Furnaces and Air Conditioners

This information is created from Lennox Application Note ACC-63-11

Flood Damaged Heating & A/C Equipment

10/9/2015

In the event Lennox HVAC equipment has been flood damaged or rendered inoperable due to a severe storm, the following steps should be taken before returning the equipment to operation:

  • Any unit that is or has been partially or completely submerged must have the electrical power supply disconnected immediately. The fuel supply to gas or oil burning equipment must be shut off.
  • Complete equipment service must be performed on the equipment. Safe and proper operation of the equipment must be verified. Failure to do so can cause further property damage and/or personal injury.
  • The extent of the damage will depend on the depth of the flood water, water type (fresh, brackish, etc) and the length of time that the unit was submerged.

Gas or Oil Furnaces & Heating Sections of Residential Package Units

  1. Ensure the electrical power supply to the equipment is off.
  2. The equipment must be thoroughly cleaned. This may require removal and disassembly dependent upon depth of water and length of time submerged.
  3. All electrical and safety components, such as those listed below, that have been under water must be removed and replaced with a new part:
    • Ignition control
    • Gas valve
    • Primary and secondary limits
    • Flame rollout switch
    • Combustion air inducer and pressure switch
    • Igniter
    • Blower motors
  4. Burners that have been under water must be thoroughly cleaned and/or replaced.
  5. Equipment insulation is secured to the cabinet with water-soluble glue. If insulation has been under water, it must be replaced with insulation of the same type, density and thickness as the original.
  6. Clean and thoroughly dry all electrical connections and any damaged wiring must be replaced.
  7. After repairs have been completed, an operational safety check must be performed on the equipment.
  8. The correct operation of all safety devices must be verified.

Air Conditioning or Heat Pump Systems & Refrigerant Sections of Residential Package Units

If the refrigerant circuit is damaged resulting in a refrigerant leak or is open to the atmosphere and has been under water, the complete system – (outdoor unit, refrigerant lines and evaporator or air handler) must be replaced.

If the refrigerant circuit is NOT open to the atmosphere, the following steps must be taken:

  1. Ensure the electrical power supply to the system is off.
  2. The equipment must be thoroughly cleaned, including the outdoor coil and evaporator in a furnace or air handler installation. This may require removal and disassembly dependent upon depth of water and length of time submerged.
  3. All electrical and safety components, such as those listed below, that have been under water must be removed and replaced with a new part: (this applies to both the indoor and outdoor equipment)
    • Electronic controls, defrost controls or electric heat controls and sequencers
    • Contactors
    • Motors
    • Refrigerant Pressure Switches (non-hermetically sealed)
  4. Equipment insulation is secured to the cabinet with water-soluble glue. If insulation has been under water, it must be replaced with insulation of the same type, density and thickness as the original.
  5. Clean and thoroughly dry all electrical connections and compressor terminals. Any damaged wiring must also be replaced.
  6. After repairs have been completed, an operational safety check must be performed on the equipment.

The correct operation of all safety devices must be verified.

System Accessories

All system accessories, such as thermostats, air filters, indoor air quality equipment, electrical devices and the air distribution system, should be evaluated using the guidelines listed above.

Warranty

Flood damaged components are not covered by the Lennox limited warranty. New replacement parts carry a one-year limited warranty. Lennox further suggests making a thorough evaluation of the necessary repairs (labor and parts) in order to provide an accurate estimated the cost to the consumer. The estimate should also include an estimate for replacement equipment so the consumer can evaluate the options available and make the best decision for their situation and needs.

Never Forget to Change Your Air Filter Again… Free Reminder Service by Email

We all do it. We forget to change the air filter or we never get around to changing the media in the humidifier. There is good news for us that are forgetful or just procrastinate. CozyParts.com offers a free reminder service that can remind you when it is time to change your air filter, humidifier media, UV lamps, or even your smoke detector or thermostat batteries. Just sign up for a free account at http://www.cozyparts.com/reminder-service/

CozyParts.com is a full service parts and maintenance supplier dedicated to Lennox Heating and Cooling products.

Baso BGN891-1C For Lennox Pulse Furnaces Expected to Arrive Soon at CozyParts

We have been getting a lot of phone calls wanting to know when we were going to get the new Baso Control for Lennox Pulse Furnaces. We expect a shipment the week of January 9th. We are keeping our fingers crossed because we know a lot of HVAC servicers have people customers that are waiting on this part ot arrive. The BGN891-1C is a new product from Baso and is in production now. The BGN891-1C is set up in our online parts catalog and you can view the product detail page by following this link.

We will update when we know more.

Baso Announces Replacement Ignition Control For Lennox Pulse Furnaces

Baso Model BGN891-1C Ignition Control for Lennox Pulse Furnaces
Baso Model BGN891-1C Ignition Control for Lennox Pulse Furnaces
Baso Gas Products LLC has answered the prayers of many Lennox Pulse furnace owners by coming out with a ignition control for use on Lennox’s popular Pulse furnaces. The new Baso Model BGN891-1C is intended to replace the Lennox OEM Ignition control that was discontinued by Lennox in October, 2011. The new control is intended for use on Lennox Pulse model families G14, GSR14, G21, GSR21, G21V and CSR21V.

CozyParts.com, Inc. is a Lennox OEM parts distributor serving customers in North America with Genuine OEM Lennox parts.

Lennox Announces Production End of Pulse Furnace Key Component Parts

In October, 2011 Lennox announced that several key components used in the Lennox Pulse product would no longer be available. This will affect the GSR14, G14, GSR21, G21, GSR21V and G21V product lines.

We have sold all of our available inventory of the 60J00 (60J0001) ignition control, 43G62 (43G6201) spark plug, and the 64K60 (64L6001) flame sensor used in these product lines.

If you have a GSR21, GSR21V, G21, or G21V series furnace in residential service that is less than 15 years old , and one of these key components fails, Lennox does have a program that will help you get a new furnace. Contact your local dealer if you feel that you feel that you qualify under this program.

Tech Tip: When do you change a flame sensor on a furnace?

We get this question a lot when the subject of electronic ignition controls comes up. Even though we have talked to a lot of manufacturers and journeyman, there is no definitive answer. Some experienced technicians will change the flame sensor any time there is a flame current issue, while others usually just clean them. Others will change them as part of their preventative maintenance every two or three years.

Our recommendation:
If the furnace ignition control is seeing a flame current that is within the ignition control’s normal range, there is no reason to change the flame sensor unless the flame sensor has a burnt look or it is pitted. If the flame sensor has a normal look, you can just clean it.

This brings up another subject. How often should you clean the flame sensor? We think the flame sensor should be cleaned each fall as part of the fall preventative maintenance. Of course, it should also be cleaned any time the flame current is low from build up on the flame sensor.

Flame sensors are really not all that exotic. The fact is that they are passive devices that are very reliable. There is no shortage of tradesmen that want to make the subject more complicated than that and we are sure there will be plenty of people that would take exception to our recommendation. Truth is, if you feel more comfortable installing a new flame sensor, its not going to hurt anything (except your customer’s pocket book).

Furnace Repair: How to check flame current.

One of the most common reasons a furnace fails to work is because the flame rectification circuit is not able to detect flame. In other words, the circuitry on the furnace that monitors the flame shuts the furnace down because it is not able to detect flame when it thinks flame should be present.

The process of burning fossil fuels used modern heating units creates a dark blue mantle in the middle of the flame. This area is highly ionized making it possible for the flame to actually conduct current. The furnace’s flame sensor has an AC voltage source applied to it by the furnace’s ignition control. When flame is present, the highly ionized area of the flame conducts current in only one direction (hence the term flame rectification). The ignition control monitors the current while the furnace is being fired and looks to make sure that the rectified current stays above a minimum level. If it doesn’t, the ignition control will shut down the gas valve.

The proper measurement of flame current (flame signal) requires that you have a good quality digital VOM. If you have a $10.00 VOM from the local hardware store, you can probably forget about making a flame current measurement. In some cases, you will need to measure DC flame current of less than 1 µA (micro amp). Only very good quality VOM’s have a current scale capable of measuring flame currents this low. For the most part, if the full scale resolution of your VOM is more than 40 µA, you probably will not be able to accurately measure flame current on ignition controls that have an operating current of 5 µA or less. With that said, here is how to connect your VOM to measure flame current:

How To Connect VOM To Measure Flame Current

How To Connect VOM To Measure Flame Current

Once you know for sure that flame current is low, the next decision is what to do to fix the issue. Most of the time, low flame current is caused by the buildup of combustion byproducts on the flame sensor. There is several schools of thought about what you should do if the flame sensor has a build up of byproducts that is acting like an “insulator” that causes the flame current to drop. Some technicians always replace the flame sensor while other technicians choose to clean the flame sensor of it’s byproducts by cleaning it with steel wool. Which is the correct way to repair the heating appliance? We believe that both methods are acceptable, however, once a flame sensor gets pitted or a burned look, it should be replaced instead of cleaned.

Inspections of Fossil Fuel Furnaces a MUST.

We often here from customers that they do not need to have their furnace inspected because it is only 10 or 15 years old and still under warranty. First, a warranty is only your guarantee from the manufacturer that they will replace the heat exchanger if it fails during the warranty period. It is not a guarantee that the heat exchanger will not fail. Many factors can cause a heat exchanger to fail prematurely… such as lack of maintenance. Restricted air flow caused by loaded filters is a major factor in premature heat exchanger failure. A proper inspection and maintenance is the key.

KMBC 9 News ins Kansas City recently did this story about Greg Hunsicker and his Furnace Safety Consultants Seminars to teach HVAC Techs how to locate failures in furnace Heat Exchangers.… its worth watching.

New HVAC Calculators Added

CozyParts.com has added new web based HVAC calculators that will be handy for many technicians. We currently have a calculator to determine a furnace’s input by clocking the gas meter and a traverse matrix air flow calculator that allows technicians to enter their traverse matrix readings into a form and calculate the air flow.