A.O. Smith VF VB 1000 Service Handbook page 34

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
High gas pressure switch present On = Yes
†
Switch 2
Number of blower speeds
‡
Switch 3
†. 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.
‡. The position of this dip switch on VF boilers has no effect on operation.
The MCB circuit board is mounted upside down on VF boilers compared to the illustrations below.
AOS WPC - Tech Training
VF BOILER SERVICE MANUAL
Servicing should only be performed by a Qualified Service Agent
On
On = 1 speed
SW2
33 of 72
Off
Off = No
Off = 2 speed
1 2 3
G
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