Dipswitch Settings - A.O. Smith Water Heater 520 Direct Vent Indoor Service Manual

12-5. Dipswitch settings

The computer board in the 520 Indoor is the same as
one in the 520 Outdoor. There are two banks of
dipswitches (right and left bank) on the computer board.
The left bank has certain special functions as shown on
the following table and generally should not need
adjustment. Carefully verify the functions of each
dipswitch before changing any settings.
The functions of the right dipswitch bank
No. Functions
1 Changes unit of displayed temperature
2 N/A
3
4 Activation of Individual operation mode
See Section 12-11
5 Pump mode
6
7 The number of priority unit in a 520 Indoor or 520
Outdoor
8 Deactivation of the freeze protection firing system
9 Deactivation of the exhaust temperature control
(This switch is for a specialized purposes only)
10 Parent / Child setting on Easy-link systems
520 Indoor / 520 Outdoor Service Manual
Right bank of dipswitches
ON position
˚C
N/A
Enable
(Default)
Two
priority units
Enable
Enable
Parent
65
CONFIDENTIAL
Ver. 1.00
Left bank of dipswitches
OFF position
˚F
(Default)
N/A
(Default)
Disable
One
priority unit
(Default)
Disable
(Default)
Disable
(Default)
Child
(Default)