66 AGR 055A through 100A IOMM AGR
Digital Outputs
The digital output board has normally open solid-state relays with an on-board replaceable 5 amp
fuse. The status of all outputs are shown by the individual output red LEDs.
Chilled Water Pump Relay
The optional chilled water pump relay is connected to terminal #10 and #9 on TB-2. When the unit
is enabled, the chilled water pump relay is energized. Be sure the relay coil is rated for a maximum
load of 1.8 amps at 120 Vac. There is a 5 amp fuse on the digital output board for this control
circuit.
External Alarm Annunciator Circuitry
An audible alarm can be connected to the Alarm Output terminals #19 and #28 of TB-3 of the
control panel and is highly recommended to make certain the operator is alerted to any alarm
condition. This output can also be used to alert a building automation system or other controls as
required. This circuit is a 24Vac 1.8 amp maximum load output but can be used as a dry contact or
another voltage by rewiring the circuit. Refer to the unit schematic.
The alarm output can be programmed to activate when an alarm or pre-alarm condition is detected.
The alarm signal is de-energized during normal operations. During a fault alarm condition the
alarm circuit will energize and the alarm status light will be on. During a pre-alarm condition the
alarm output and status light will pulse “on” for one-half second and “off” for four seconds.
Note: The alarm signal is not active during a power failure and will not provide a “Loss of
Power” alarm.
PC Connection
The MicroTech controller can be connected to an IBM or IBM compatible computer for local or
remote system monitoring. Communication network wiring uses low voltage shielded twisted pair
cable (Belden 8760 or equal). The network uses the RS232 communications standard with a
maximum cable length of 50 Feet. An RS232/485 adapter may be used to allow for cable runs to
5000 feet.
Telephone line
If remote access and monitoring of the unit is chosen, then a voice quality direct dial telephone line
is required. The line must be a dedicated line and used only for modem access. The phone line
must be terminated with a standard RJ-11 modular phone plug.
Software Identification
Control software is factory installed and tested in each panel before shipment. The software is
identified by a program code printed on a small label attached to the controller. The software
version may also be displayed on the keypad display by viewing the menu items in the Misc. Setup
menu. The software “version” is the last three digits of the software identification code.
Example of typical software identification: AGR2E01A
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