Ignition Fails on First Cycle


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Old 12-01-10, 07:19 AM
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Ignition Fails on First Cycle

Background Information

Location = Northern Illinois
Building = 8 Room Townhome
Furnace = York Diamond 80 model P2MP upflow installed 1995 and under annual maintenance with local heating service
Thermostat = White-Rodgers 1F80-261 Programmable
Furnace Modifications = 11/26/2010, new Honeywell S9200u1000 HSI integrated furnace control to cure a total failure to ignite issue (DIY install)

Issue Information (manifested after new control installation)


●Thermostat calls for heat

First Cycle =
Induction fan starts;
after about 30 seconds HSI (new) properly glows brightly;
after about 15 seconds HSI cuts off without ignition

Second Cycle =
Induction fan starts;
after about 30 seconds HSI glows brightly;
after about 15 seconds the gas valve clicks on;
ignition is successful and HSI cuts off, blower runs and the heat cycle is successfully completed.


What do I need to do to cause ignition during the first cycle?
 

Last edited by betterL8; 12-01-10 at 08:29 AM.
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Old 12-01-10, 08:29 AM
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Why did you replace the ignition control?

>



Why are you making a distinction here?

Ordinarily the hot surface ignitor would heat up and then the gas valve would turn on, the burners would light and the HSI would shut off. Is something else happening?
 
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Old 12-01-10, 08:38 AM
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Originally Posted by SeattlePioneer View Post
Why did you replace the ignition control?
As stated in the original post "to cure a total failure to ignite issue (DIY install)." That issue was cured by the new control board. The new issue has manifested itself after the installation of the new control board.

Reviewing the cycles after thermostat calls for heat

FIRST CYCLE
induction fan on
30 second delay
HSI on for about 15 seconds
HSI off

SECOND CYCLE (ignition retry)
induction fan on
30 second delay
HSI on for about 15 seconds
Gas valve is initiated (it clicks on)
Burner ignites
HSI off
Normal heat cycle completes
 
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Old 12-01-10, 07:29 PM
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Have I offended you or something?
 
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Old 12-01-10, 07:40 PM
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Is the ignitor getting white hot?

Does it appear to get as hot on the second trial as the first?


Is the main burner gas switching on with the first trial for ignition?


In other words, are trial one and trial two the same except for the successful burner ignition with the second trial?

If so, you might want to measure the AC volts being applied to the HSI. Should be 120 VAC in most cases.
 
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Old 12-02-10, 02:50 AM
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"Is the ignitor getting white hot?"
The ignitor is very white hot. I'm afraid to look at it directly just a few seconds after it is initialized.

"Does it appear to get as hot on the second trial as the first?"
Absolutely. I can not see any difference in igniter intensity at all.

"Is the main burner gas switching on with the first trial for ignition?"
I don't think so. As noted in my description of the FIRST CYCLE, I do not hear any click in the gas module as I do just before ignition in the SECOND CYCLE.

"In other words, are trial one and trial two the same except for the successful burner ignition with the second trial?"
With the exception of the gas module turning on, they are identical except that the SECOND CYCLE may have a slightly (1-2 seconds) longer HSI run time than the FIRST CYCLE.
 

Last edited by betterL8; 12-02-10 at 02:51 AM. Reason: mispell
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Old 12-02-10, 06:10 AM
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There is a short bank of dip switches on the control board that manage what is called Safety Timings. It allows reset of "HSI Warm Up" and "Trial for Ignition." I'm going to change the "HSI Warm Up" from 17 seconds to 30 seconds and the "Trial for Ignition" from 4 seconds to 6 seconds. That may allow enough time for the gas module to be turned on during the FIRST CYCLE.
 
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Old 12-02-10, 12:15 PM
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Changed the HSI. That fixed it. Reset the dip switch in the short bank.

The recommended replacement HSI (41-405) had the wrong sex on the 2-pin plulg. I had to extract the pins from the existing HSI connector housing, then the new HSI connector housing and remount the existing housing onto the the new HSI.

I'v since then found 2 recommended replacements the 41-405 and the IG102. The first is flat while the second is round-spiral and has the proper gender on the plug. I've ordered one of each as a backups to keep in the basement.

Thanks for the help.
 
 

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