MODELS ST-2 / ST-3 Rev. E
Model ST series panels are for single stage heating and
cooling with manual changeover. Zone 1 is the "master" zone which controls
the heating and cooling mode and also the fan operation. The ST-2 is a 2
zone panel and the ST-3 is a 3 zone panel. Zones 2 and 3 will only operate
in the same mode that the zone 1 thermostat is in. Each thermostat can
turn the system "on" and "off ", but only in the same mode. It is
recommended the zones 2 and 3 have no switching subbases for the thermostats.
The ST panels can be used with mechanical or digital programmable thermostats
that are non-power stealing.
Open-Close switches on the control panels near the damper terminal blocks
allow for continuous air circulation. This switch controls the damper
position when the heating and air conditioning system is at rest. The ST
panels can be wired together to create larger zoning systems up to 6 zones.