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I HAVE A LENNOX FURNACE WITH AN INTERMITTENT PILOT GAS

Customer Question
I HAVE A LENNOX FURNACE...
I HAVE A LENNOX FURNACE WITH AN INTERMITTENT PILOT GAS IGNITION CONTROL HONEYWELL S8600H (NOW OBSOLETE) A HONEYWELL NAT GAS VALVE VR8204A2076 (NOW OBSOLETE) AND A TJERLUND MODEL HSUL-J POWER VENTER (NOW OBSOLETE). I HAVE REPLACED THE 24 VOLT TRANSFORMER AND INSTALLED THE HONEYWELL S8610U INTERMITTENT PILOT GAS IGNITION CONTROL, I REPLACED THE IGNITION WIRE PILOT LIGHT BECAUSE I COULD NOT GET CONTINUITY WITH THE OLD WIRE AND THE PILOT LIGHT IGNITOR. THE PILOT VENTER DOES NOT COME ON WHEN THE THERMOSTAT CALLS FOR HEAT BUT THAT APPEARS TO BE BECAUSE I AM NOT GETTING 24 VOLTS ACROSS THE MV AND PV/MV TERMINALS ON THE GAS VALVE. AND IN READING THE TJERNLUND DATA IT WON’T PULL IN THE POWER RELAY TO THE POWER VENTER MOTOR UNLESS IT DOES. I DON’T GET A SPARK AT THE PILOT LIGHT IGNITOR IF THE POWER VENTER PROOF OF FAN SWITCH DOES NOT MAKE. I TESTED THE POWER VENTER MOTOR AND THE PROOF OF FAN SWITCH AND BOTH ARE OPERATING CORRECTLY.MY QUESTION IS WHY AM I NOT GETTING 24 VOLTS ACROSS THE MV PV/MV TERMINALS ON THE GAS VALVE? THE LENNOX MODEL NUMBER IS ***** THE S/N IS 4691G00031.
Submitted: 2 years ago.Category: HVAC
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Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 2 years ago
I TRIED TO ENTER MY CELL NUMBER AND THE SYSTEM SAID MY EMAIL HAD ALREADY BEEN USED. I USED THIS SYSTEM A NUMBER OF YEARS AGO BUT DON'T REMEMBER SETTING UP AN ACCOUNT. MY CELL IS(###) ###-#### THERE IS NO DIRECTIONS FOR FINDING OUT MY OLD PASSWORD. MY E MAIL IS***@******.***.
Answered in 1 hour by:
2/1/2016
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3,972
Experience: Experienced in all aspects of HVAC, both residential and commercial.
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Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite. At the end of our dialog you will be asked to rate my service, but please wait until then and all your question(s) have been answered satisfactorily. If you are not satisfied, I'd appreciate it if you'd tell me why before leaving a negative rating and allow me to continue to work with you until we are able to both agree on an outcome to follow. Thanks for your business!

In order for the module to send voltage to the gas valve, you must first have 24 volts to 24 V (GND) and TH-W. Do you have 24 volts here o0n a call for heat?

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

If you do and control does not send 24 volts to pilot to light and then main gas, it would be a bad control.

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Customer reply replied 2 years ago
NO IT IS THE SECOND CONTROL I HAVE INSTALLED. IT IS INTERLOCKING SOMEWHERE
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

The control is designed to send 24 volts to MV/PV and PV on gas valve and first light pilot. Then if the system has a flame sensor, it must sense pilot flame and then allow main gas to come on. I'm not sure what setup you have there as that's a very old furnace.

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Customer reply replied 2 years ago
THIS IS NOT WORKING
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Does your pilot have a separate flame sensor or not?

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Customer reply replied 2 years ago
NO
Customer reply replied 2 years ago
I LEFT THE JUMPER ON PER INSTRUCTIONS
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

When you call for heat, does control spark and light pilot or not?

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Customer reply replied 2 years ago
NO I DO NOT GET A SPARK AND PILOT DOES NOT LIGHT . BUT AS I LOOK AT THE POWER VENTER DOCUMENTATION UNLESS THE PROOF OF FAN SWITCH PULLS IN PILOTAND CLOSE THE SWITCH THE GAS VALVE WILL NOT OPEN TO THE PILOT
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Is this a separate venter motor arrangement that you have? This is not standard to my knowledge.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Are you venting vertically through the side of the house? This would usually be where a Tjernlund would be used.

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Customer reply replied 2 years ago
IT ISSEPERATE AND IT IS HORIZONTAL VENTING THE MODEL NUMBER IS *****
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

If you jump out the air proving switch does it then work?

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Try that, and let me know. I have to step away for a few minutes, but will check back.

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Customer reply replied 2 years ago
I AM NOT AT THE FURNANCE LOCATION NOW. I AM GOING TO THE FURNACE LOCATION TOMARROW TOMARROW. ARE YOU SAYING TO PUT 24 VOLTS ON THE VENTER POWER RELAY . MY UNDERSTANDING IS THE GAS VALVE OPENS FOR THE PILOT. MV PV/MV TERMINALS GET 24 VOLTS TO OPEN PILOT GAS. THAT 24 VOLTS PULLS IN THE 110 VOLTS TO THE POWER VENTER MOTOR . MOTOR ON FAN CAUSES PROOF OF FAN TO MAKE. PROOF OF FAN TELLS CONTROLER THROUGH THERMOSTAT TO OPEN GAS VALVE TO FURNACE BURNERS. EVERYTHING GET WARM. AM I RIGH HERE?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

No, I'm just saying to jump past the air proving switch to see if the ignition process works.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

If there is some special way this is wired, you'll have to let me know as I have access to standard Lennox furnace wiring diagrams, but not some optional equipment wiring.

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Customer reply replied 2 years ago
I'LL TRY THAT TOMARROW. IS THERE A CASE NUMBER ***** THIS. AND CAN I ENTER A CASE NUMBERTO GET BACK TO YOU
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Just bookmark the page and come back to it. Question will remain open.

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Customer reply replied 2 years ago
OK I WILL BE THERE AFTER 12:00 CENTRAL TIME.
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

When you get a chance, please look at that Tjernlund manual you sent me a link to and go to the wiring diagram pages and tell me how yours is wired. It will probably correspond to one of those diagrams.

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Customer reply replied 2 years ago
IS THERE A PRINT BUTTON HERE?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

No, I don't believe so. Perhaps if you highlight everything and transfer it to another file, you can print.

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Customer reply replied 2 years ago
HI TIM I'M SORRY BUT I CAN NOT GO TO THE FURNACED TODAY. BUT I AM NOT QUITING THIS SESSION. I HOPE TO GO TOMARROW BUT MY DAUGHTER IS UNCERTAIN
HARRY
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

OK, thanks for the update.

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HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Let me know if you still wanted to work more on this question.

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