Tag Archives: logic module

Heating Season — Flame Rectification

Today’s units react to unsafe conditions in less than a second. This is accomplished through the use of “computerized control modules” and a flame sensing control system known as flame rectification. The safety used in today’s furnaces that accomplishes flame rectification is … Continue reading

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Cycling off A/C or Heat Pumps by Utility Companies Revisited

People are looking for ways to save money on their utility costs, especially, air conditioning.  To control the power usage in peak times, some Utility Companies regulate consumer usage by cycling off a consumer’s A/C outdoor unit at selected times during … Continue reading

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New Honeywell Economizer Controls – Part 2

So, now that you have read my last post and have an “overview” of the new economizer control, we can get into the nitty-gritty of how to install and set-up, and diagnose the new economizer. The installation part is easy. The … Continue reading

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New Honeywell Economizer Controls

Spring is in the air (but we still have some snow too in the north central region) and as our thoughts turn to COOLING, we need to look at the ECONOMIZER.  Economizers still are the most misunderstood, misdiagnosed, most often … Continue reading

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Older Sunline Units – Troubleshooting Heating

For those who subscribe to my blog, you probably just got an email saying there was a new post on Sunline and , guess what — I goofed – instead of hitting save, I hit send.  So here is what I really wanted … Continue reading

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New Economizer Control

Just when you think you can’t learn anything new about economizers,  Honeywell is going to phase out all of those controls and is introducing a new control — the W7220.  Not that the information on the old controls is obsolete … Continue reading

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Economizers –Revisited Part 4

In this fourth and final post on Economizers, I’ll try to go through troubleshooting the mod motor and the logic module.  In the last post, we went over the enthalpy sensors and discharge/mixed air sensors diagnostics.  Now we begin  with the … Continue reading

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