Unit Controller
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IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
Screen Definitions – ALARM
ALARM ACTIVE (X)
Time Date
Alarm Description
OR
ALARM ACTIVE (X)
No more alarms
Press ENTER to clear all active
alarms
If the unit is off 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
first 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.
Screen Definitions – EVENT LOG
EVENT LOG (X)
Event Description
Time Date
SET ALARM LIMITS
SET ALARM LMTS (1)
Low EVAP Pressure
Hold=XXXpsi
Unload=XXXpsi
The Hold and Unload have the same default value of 59 psi. If
two compressors are running, the LowEvPrUnld is in effect and
the lag compressor will be shut off to unload the unit. If one
compressor is running, the LowEvPrHold is in effect and the
lag compressor is prevented from starting, thereby holding the
unit capacity
The last action to take place is the shutoff of all compressors
running when the LowEvPrStop setting is reached (default is
58 psi). Reducing these time intervals will increase detrimental
compressor cycling. It is recommended that these settings not
be changed.
SET ALARM LMTS (2)
High Cond Pressure
Unload= XX .X°F
Stop=XXX sec
Unload is a limit alarm that unloads the unit at 370 psi in an
attempt to prevent total shutdown from the HighCondPr at 380
psi. The stage down is set at 370 psi. It is recommended that
these settings not be changed.
Stop (the unit high-discharge-pressure shutdown) is a stop
alarm that shuts off the unit when the discharge pressure
reaches the setting. The default setting is 380 psi.
LowEvPrDelay is a time delay on the low pressure trip that
reduces nuisance low-pressure trips. The default setting is 30
seconds.
SET ALARM LMTS (3)
GroundFault = N
PhaseVoltage = N
Evap Freeze (the unit freeze protection shutdown) is actually
a stop alarm and shuts off the unit when the LWT reaches
36°F. It is cleared by going to the CLEAR ALARM menu in the
ACTIVE ALARM hierarchy.
EvapFlowProof is the flow switch interlock. Closing the flow
switch and therefore proving the existence of chilled water flow
resets this trip. It is recommended that these settings not be
changed.
BAS Interface
The BAS interface will use the supervisor port on the controller
as a connection point.
Protocols Supported
The following building automation system (BAS) protocols are
supported. It is possible to change the building automation
interface without loading different software.
BACnet®
When protocol is set to BACnet, the baud rate and ident set
points are not accessible. The ident setting is locked at 1 for
BACnet, and the baud rate is locked to 19200.
LONworks®
With protocol set to LON, the baud rate and ident set points are
not accessible. The ident setting is locked at 1 for LON, and
the baud rate is locked to 4800.
Summary of Contents for WGZ030DW
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