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Posted by Andrew on January 13, 2011 at 22:11:49:
In Reply to: Understanding Powerhead operation posted by Mike D on January 19, 2008 at 00:25:07:
http://customer.honeywell.com/Techlit/Pdf/60-0000s/60-2133.pdf
To install a replacement powerhead in a system with an old style body (series 1-5), the valve body must be converted to accept the new powerhead using part no. 40003918
Conversion Kit.