Honeywell Furnace 396079 User Manual

Piezo Envelope Assembly  
PART NO. 396079  
INSTALLATION INSTRUCTIONS  
Pilot Lighting Test  
APPLICATION  
1. Turn the knob on the gas valve counterclockwise  
to the PILOT position, push the knob down, and  
hold in position. The pilot valve opens and allows gas  
to flow to the pilot burner.  
2. Push the plunger on the piezo until the pilot burner is  
lit. Hold down the knob until a strong flame is present  
(approximately 60 seconds).  
The 396079 Piezo Envelope Assembly is a replacement  
device used with the VS8420/21 and VS8510/20/21 gas  
valves, that allows manual lighting of the pilot burner. The  
piezo is mounted on the gas valve and lights the pilot  
burner by creating a spark when the plunger is depressed.  
The connecting wire includes a terminal to connect to the  
electrode of the pilot burner.  
3. Release the knob. The shaft will move upward and  
engage the safety valve lever that opens the safety valve.  
The piezo envelope assembly includes the piezo, cover  
and 2-screws.  
4. Turn the knob counterclockwise  
to the ON  
position. On a call-for-heat, the main valve opens and  
the main burner ignites.  
PIEZO  
INSTALLATION  
When Installing this Product...  
1. Read these Instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
2. Check the ratings given in the Instructions and on  
the product to make sure the product is suitable for  
your application.  
M12899  
SCREWS (2)  
TOP VIEW  
OF KNOB  
COVER  
3. Installer must be a trained, experienced service  
technician.  
4. After installation is complete, check out product  
operation as provided in these Instructions.  
Mounting and Wiring the Piezo  
GAS CONTROL KNOB  
PIEZO  
IMPORTANT  
This installation requires working within the  
combustion chamber, follow instructions carefully.  
1. Turn the knob on the gas valve to the OFF position.  
See Fig. 1.  
2. Disconnect pilot burner wire from piezo wire.  
3. Remove the two screws from the cover.  
4. Remove and discard the existing; cover, piezo and  
screws.  
5. Replace the existing piezo with the new piezo.  
6. Place the new cover over the new piezo.  
7. Screw the new screws into the new cover.  
8. Connect the pilot burner wire to the piezo wire.  
M12896  
Fig. 1. Exploded view of the piezo assembly and pilot  
burner connection with VS8520 gas valve.  
Home and Building Control  
Honeywell Inc.  
Honeywell Plaza  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
P.O. Box 524  
Minneapolis, MN 55408-0524  
M2H 3N7  
69-1206-1  
Printed in U.S.A. on recycled  
Copyright © 1998 Honeywell Inc.  
69-1206–1 L.C. Rev. 9-98  
All Rights Reserved  
paper containing at least 10%  
post-consumer paper fibers.  
 

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