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TABLE OF CONTENTS
I Product Description 1
II Specifi cations 1
III Before Installing 2
IV Locating the Boiler 2
V Air for Combustion and Ventilation 4
VI Venting 9
Vent System Design 9
Vent System Assembly 22
VII Gas Piping 32
VIII System Piping 33
IX Wiring 38
CB502 Control System 38
R8285 Control system 44
X Start-up and Checkout 48
XI Service and Maintenance 52
XII Troubleshooting 57
XIII Parts 65
Appendix A:Special Requirements for
Side-Wall Vented Appliances in the
Commonwealth of Massachusetts
74