Unit installation

IOMM AGZ-3 AGZ 035A through 065A 55
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 120Vac. 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 can 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
can also be displayed on the keypad display by viewing the menu items in the Misc. Setup menu.
Example of typical software identification: AGZ 2
E 01 A
Unit Model
Refrigerant
English or Metric
Revision
Ver si on