A.O. Smith TC-099 - Manual (Page 34)

AOS WPC - Tech Training 33 of 72 Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
VF BOILER SERVICE MANUAL
MCB - SECTION G
Along the bottom edge of the MCB there is a second dip switch (SW2). This page details
and explains the SW2 dip switch. There are 3 switches on SW2: switch 1 is a spare, switch
2 must be configured correctly, dip switch 3 does not affect operation on VF boilers.
Switch 1 Spare On Off
† Switch 2
†. High gas pressure switch is optional; this switch must be set to “Off” if there is not a high gas
pressure switch installed on the boiler.
High gas pressure switch present On = Yes Off = No
‡ Switch 3
‡. The position of this dip switch on VF boilers has no effect on operation.
Number of blower speeds On = 1 speed Off = 2 speed
G
SW2
1 2 3
The MCB circuit board is mounted upside down on VF boilers compared to the illustrations below.