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INTERIOR JUMPER & SWITCHES
24
Fig # 9242
Fig # 9245
Fig # 9246
S-3
J-2
The Last Stage Selector Jumper (J2) is comprised of an eight (8) position jumper block. A shunt
bar jumper is placed in the position corresponding to the last active stage or boiler number. See
table below for examples of Jumper (J2) settings.
The First Stage Selector (Stage #1 ID) (S2) Switch is an eight (8) position switch, each switch
position corresponds to a Y-Series output stage. Turn ON the switch(s) that correspond(s) to
the FIRST stage of EACH boiler. Turn OFF the switch(s) that correspond(s) to the second (or
subsequent) stage(s), of EACH boiler.
(Switch #1 should always be on.) See the table below for examples.
The Mode Selector Switch (S3) is comprised of an eight (8) position dip switch with the
following functions:
AUTO
Sw #1 - Manual/Auto Lead-lag Selection Off - Manual lead-lag selection
On - Automatic lead-lag selection
OD off
Sw #2 - Outdoor Reset Off - Outdoor Reset Enabled
"OD off" On - Outdoor Reset Disabled. Use this setting
for applications like Domestic Hot Water
where outdoor air sensing is not required.
Note: The outdoor sensor must be connected in all modes, otherwise a sensor error will be
displayed.
S-2