OM 1239
10
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I/O expansion module jumper settings
Table 7: I/O expansion module jumper settings
I/O Expansion Description
Jumper(s)
Jumper Setting
Model
Not Used
JP1
JP1
Open
–
Not Used
JP2
JP2
Open
–
Secondary Heating
Options
JP3 & JP4
JP3
Open
None
JP4
Open
JP3
Shorted
Supplemental Electric Heat
JP4
Open
JP3
Open
Boilerless Electric Heat
JP4
Shorted
Cooling / Dehumidification
Options
JP5 & JP6
JP5
Shorted
Without Hydronic Cooling
JP6
Open
JP5
Open
Hydronic Cooling (Waterside Economizer)
JP6
Shorted
Not Used
JP7
JP7
Open
–
Lead Compressor Option
JP8
JP8
Open
Compressor #1 is Lead (factory default setting)
JP8
Shorted
Compressor #2 is Lead