Bosch 520HN - Reinstalling Pilot Assembly and Orifice

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Cleaning & Replacing The Pilot Assembly Technical Service Bulletin
Data subject to change without notice | Printed in the USA | BTC 746002316 A | 07.2010 Bosch Thermotechnology Corp.
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel: 1-866-642-3198
Fax: 1-603-584-1687
www.boschpro.com
3. Clean orice with compressed air or aerosol carburetor cleaner.
(NOTE: Do not ream or poke any object through orice opening).
Reinstalling pilot assembly and orice - 520HN Model
1. Screw clean or new orice into pilot electrovalve and tighten with
8mm wrench. Do not over tighten.
2. Insert pilot assembly into burner and t cylindrical air screen onto
orice and pilot tube.
3. Insert screws through pilot shield and pilot assembly into burner
and tighten.
5. Replace cover, open gas supply and return heater to service.
6. If pilot ame is not strong and blue, replace orice (NG is
stamped 2C, LP is stamped 1C).