IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 78 www.DaikinApplied.com
TGZ Unit (R134a)
The Bypass Valve value shall be “None” (in place of XXX%)
if the Valve/VFD Control setpoint = None or VFD Stage. The
VFD Speed value shall be “None” if the Valve/VFD Control
setpoint = None, Valve Setpoint, or Valve Stage.
This screen shows the number of air-cooled condenser fans
“on” for each circuit. This screen will show the fans “on”
whether they are actually connected to and controlled by the
MicroTech II controller or not.
Stg Error Up Down
XXX.X
Time Date
Alarm Description
OR
No more alarms
Press ENTER to clear
all active alarms
If the unit is o on a shutdown alarm or running, but in a limit
alarm condition, the cause and date will appear in the upper
screen. If there is a simultaneous occurrence of more than one
alarm, the others will appear in additional screens below the
rst one, accessed by the DOWN ARROW.
Either type alarm will light a red light in back of the LEFT-
ARROW KEY. The light will go out when the fault is cleared.
To clear the fault, scroll down to the last screen and press
ENTER. If other faults have appeared, they will all be cleared
at the same time. It is not necessary to have a password open
to clear alarms.
ALARM LOG (X)
Alarm Description
Time Date
Data Edit and scroll
The last 25 alarms, either shutdown or limit, are shown in
this menu and subsequent menus located under it. ARROW
DOWN from this menu will go to the next-to-last alarm,
ARROW DOWN again will go to the second from last, and so
on through the last 25 occurrences. The screens are numbered
(1), (2), (3), etc.
Event Description
Time Date
Set Unit Setpoints
SET UNIT SPs (1)
Unit Enable settings can be OFF and ON as determined from
the Unit Enable setpoint.
Unit Enable is an external signal or a keypad setting that keeps
the unit o when the setting is OFF and allows it to run if there
is a call for cooling when the setting is ON. The source for the
signal is selected in the 4th line and can be:
• KEYPAD, in which case the selection is made in line 2
and would be normally selected as ON. This is the normal
setting when no external signals are controlling the unit.
• SWITCHES, in which an external switch is wired across
terminals #40 and #53. (See wiring diagram page 8 or 9.)
• NETWORK, used with BAS signal, which is wired to the
three communication ports.
• Unit Mode settings can be
• COOL, normal setting used with chilled water air-
condition applications.
• COOL w/GLYCOL, used with low temperature, glycol
applications. It allows a lower LWT setpoint to be used.
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