User Guide

ZONE DAMPER WIRING
• Run 2-conductor thermostat wire for spring
return dampers (normally open or normally
closed).
• Run 3-conductor thermostat wire for power
open/power close dampers.
• Multiple dampers for the same zone can
be wired in parallel as shown in FIGURES
9 & 10.
• Wire the dampers to the zone panel:
– NC – This terminal is used to power
open a normally closed damper. For
power open and power close dampers
this terminal is used to power open the
damper.
– NO – This terminal is used to power close
a normally open damper. For power open
and power close dampers this terminal is
used to power close the damper.
– COM – This terminal provides a common
connection for the NC and NO terminals.
• If multiple transformers will be required,
wire them in parallel as shown. Before
wiring the transformers together, ensure
that they are connected in phase by
observing polarity marks or terminal
orientation on each transformer.
See FIGURE 11.
OPEN
CLOSE
COMMON
OPEN
CLOSE
COMMON
IMPORTANT: CHECK PHASE OF TRANSFORMERS BEFORE WIRING TOGETHER
90-2091
FIGURE 9 – NORMALLY OPEN / POWER CLOSE DAMPERS
FIGURE 10 – POWER OPEN / POWER CLOSE DAMPERS
FIGURE 11 – MULTIPLE TRANSFORMERS
90-2090
90-2141
English 7
61001165A 6403-6404 Zoned Comfort Control Install.indd 7 11/3/15 2:55 PM