Certified Drawing
IM 613 / Page 13 (Rev. 7/99)
Following are UVC start-up procedures for each communication
type. The start-up procedure must be performed by a qualified
technician for every UVC on a job.
Stand-alone
Because stand-alone controllers are independent of each other,
they may be started in any order.
PC Access
A PC is not required for stand-alone UVC start-up; however, the
start-up process will be easier and faster if a PC is used. If a PC
is used, it must be equipped with Monitor software. For further
information, refer to “PC Connection” in the “Service Information”
section of this manual.
Procedure for Each Stand-alone UVC
1. Verify that the main power switch is at “Off.”
2. Verify that the hex switch setting is not “00” or “FF.”
These settings are reserved for special applications. For
further information, refer to “Hex Switches” in the
“Component Data” section of this manual.
3. Compressorized Units Only (Self-contained or Split
System): Set hex switches for random start delay.
Valid settings are between 01 and 3F. For further
information, refer to “Random Start” in the “Standard
Control Features” section of this manual.
4. Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to the desired speed, wait 5-minutes until calibration
is complete.
5. Check the status LED and operating mode changeover
devices. The status LED should illuminate after calibration.
If a wall sensor package is used, the remote status LED
should also illuminate. Referring to Table 1, verify that the
day-night changeover and tenant override options (if
present) are working properly. Do this by switching these
devices and observing the status LED.
6. Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the room setpoint and unoccupied offset
pots to obtain the expected heating or cooling control
actions. If a PC is available, adjust any other applicable
parameters to obtain the expected UVC control actions.
7. Check the remote setpoint adjustment pot operation
(if present).
Verify that the expected UVC control action occurs when
the remote pot is adjusted up or down.
8. Check that the ventilation lockout option works properly
(if present).
Communication Acceptable
Port Terminal Voltage Reading
4 (+) 3.0 ± 0.3 VDC
5 (-) 2.0 ± 0.3 VDC
6 (ground) 0.0 ± 0.2 VDC
Table 8. Network Communication Port Terminal Voltage Ranges
Start-Up
When the unit is in the occupied operating mode, verify
that the OA damper closes when the ventilation lockout
relay is energized.
9. Check that the exhaust fan interlock option works properly
(if present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
Master/Slave
Because it provides operating mode and setpoint information to
the slaves on its network, the master UVC must be started
before any slave. After the master has been started, the slaves
may be started in any order. However, if the start-up order follows
the daisy chain from the master UVC to successive slaves, it will
be easier to detect any wiring problems that may exist in the
communications trunk.
To perform the setup procedures on the next page you must have
the Windows Monitor program installed on a PC, the PC must be
connected with proper cabling to Port-A on the MicroTech con-
troller, and you must have established communication between
the PC and the controller. The cable kit required to properly
connect a 9-pin serial PC port to Port-A on a MicroTech controller
is P/N 057186802 which will contain cables P/N 067784501 and
P/N 067784503.
The DOS Monitor program may also be used to perform these
setup procedures.
Points to keep in mind about Master/Slave Units
• Master/Slave controllers must be either all MicroTech 125
or all MicroTech 325; you cannot mix 125’s with 325’s and
vice versa.
• Master/Slave networks that have both new and old EOS
version MicroTech 325 controllers must use a new EOS
controller for the Master (new EOS 325 controllers are
labeled 21.169 or 21.A9, all other 325’s are old EOS).
• Master/Slave controllers both use the same program
(UV*M**.COD).
• All units are shipped as stand-alone units. Master/Slave
code must be downloaded and then Master/Slave configu-
ration performed.
• Slave UVC’s are considered to be independent slaves, this
means that Slave UVC’s obtain their setpoints from the Mas-
ter UVC but the Slave UVC’s then operate based upon their
own sensors.
• Port-A on a Master UVC unit will not communicate as you
may expect a stand-alone UVC to communicate. If you must
connect directly with a Master UVC, you must first set its
HEX network address switches to FF then cycle power. The
address to use in the Monitor program would then be 00.FF.
While the HEX network address switches are set at FF, the
Master UVC will not communicate with the Slave UVC’s
properly; therefore, you must remember to return the HEX
switches to their proper settings, then cycle power when
you are done.
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