Venstar T1900 Installation - Manual (Page 11)

Page 3.5
3
Y2 JUMPER SETTING
If the jumper for MISC1 is set to Y2 the
will control a second stage of cooling. MISC1 screw terminal on the backplate
Y2 OPERATION - SECTION 14 of the Owner’s Manual
Control up to two Cool stages.
The 2nd Stage of heat or cool is turned on when:
(A) The 1st Stage has been on for the time required (step #27,
page 14.6). It is adjustable from 0-60 minutes and the default
is two minutes.
(B) The temperature spread from the setpoint is equal to or greater
than: the setpoint plus the deadband (step #24, page 14.5), plus
the 2nd deadband (step #25, page 14.5). This 2nd deadband is
adjustable from 0-10 degrees and the default is two degrees.
Explanation of Jumper Settings
(continued)
And
Cool
Setpoint
Deadband Deadband
db 1 db 2
(adj. 0-10 ) (adj. 1-6 )
1st Stage
turn on
2nd Stage
turn on
Cooling
TEMPERATURE INCREASE