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520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
1
CONFIDENTIAL
520 Direct Vent Indoor
and Outdoor Models
On-Demand Water Heater
Service Manual
Water Heater
Model 520 Direct Vent Indoor
Water Heater
Model 520 Outdoor
A.O. Smith Water Products Company
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840