Technical information

A. O. Smith Water Products Company Service Handbook
Irving, Texas 2000© Training Department
34
SERVICING AIDS
1. This type product is polarity sensitive. Be certain that your electrical supply wire neutral has no
voltage.
2. This unit will produce condensation--quite heavily at times. The outlet drain hose must be allowed
to drain. Exhaust Vent piping must also drain condensate. Code 11 error would imply that these
must be checked.
3. If this unit is located in a cold climate, take steps to ensure that exhaust vapors are not inhaled by
the air intake vent. Terminate both vents in the same area but maximize the distance between
them.
4. Do not combine vent these units.
5. Pushing the reset button at random times may alter setting of the control. Note the sequence of
operation comments on when to push this button.
6. If you make a setting change, cycle the heater with this new setting to lock it into memory.
7. The first items to check on a service call
a. Correct venting installation
b. Drainage of condensate from hose and exhaust vent pipe
8. BTH models are certified to 6.800 ft. ASL with the standard orifices--air and gas
9. The temperature display board indicates average tank water temperature. If one tank sensor is "open,"
the indicator will display the active sensor temperature. (Because the top tank sensor also contains
the high limit-24V-sensor, disconnecting this from the control board results in an error code (04).)
10. Temperature and pressure relief valve operation. Weeping usually indicates thermal expansion. Large
volume discharge usually indicates excessively hot water operation.
11. BTH models are well within decimal level limits but, if you desire to lower the installation level
approximately 6 decibels a muffler (AOS No. 192718) may be installed in the exhaust vent.