IM 986-2 / Page 47 of 48
General Use and Information
The MicroTech III unit controller is provided with two
drive terminals, R(24VAC) and C(0 VAC) that can be
used by the end user to drive the thermostat inputs (G,
Y1, Y2, W1, and W2) and control inputs (U, E, and
O). Any combination of a single board drive terminal
(R or C) may be used to operate the MicroTech III unit
controller’s control or thermostat inputs. However, only
one drive terminal (R or C) can be connected to any
individual input terminal or damage may result. Some
control inputs are not accessible to the end user (for
example, HP, LP, SLTS, and COF).
Typically the MicroTech III unit controller’s R (24VAC)
terminal is used to drive the board’s thermostat inputs
and control inputs by connecting it to the R terminal
of an industry standard thermostat. The control outputs
of the standard thermostat are then connected to the
MicroTech III unit controller thermostat inputs and
control inputs as needed. Any remaining board input(s)
may be operated by additional thermostat outputs or
remote relays (dry contacts only).
All MicroTech III unit controller inputs must be
operated by dry contacts powered by the control board’s
power terminals. No solid state devices (Triacs) may be
used to operate the MicroTech III unit controller inputs.
No outside power source may be used to operate the
MicroTech III unit controller inputs.
To avoid electrical shock, personal injury or death, be
sure that field wiring complies with local and national fire,
safety, and electrical codes, and voltage to the system is
within the limits shown in the job-specific drawings and
unit electrical data plate(s).
Power supply to unit must be disconnected when
making field connections. To avoid electrical shock, per-
sonal injury or death, be sure to rigorously adhere to field
wiring procedures regarding proper lockout and tagout of
components.
DANGER
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