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IM 1049-9
DANGER
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, personal
injury or death, be sure to rigorously adhere to field wiring
procedures regarding proper lockout and tagout of components.
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.
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eneral
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nforMation
