Unit Controller
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IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
Unit states can be OFF, COOL, GYLCOL, ICE, or ALARM as
determined from the Unit Mode set point, the Unit Enable, and
the presence of an alarm. Circuit states can be OFF/OFF, ON/
OFF, OFF/ON, and ON/ON. Evaporator Pump States can be
OFF, STRT, or RUN.
When more than one screen are stacked (i.e., relate to each
other on the same subject), they are numbered sequentially
with the numbers appearing in the upper-right corner. This
menu gives the status of digital outputs (D.O.), 1=ON, 0=OFF.
Numbers are 1 through 18. See Table 6 on page 19 for number
reference
This menu gives the status of digital inputs (D.I.), 1=ON,
0=OFF. Numbers are 1 through 18. See Table 5 on page 19 for
number reference.
Water Cooled = Y Only
VIEW TOWER (2)
Bypass Valve = XXX%
VFD Speed = XXX%
The Bypass Valve value shall be “None” (in place of XXX%)
if the Valve/VFD Control set point = None or VFD Stage. The
VFD Speed value shall be “None” if the Valve/VFD Control set
point = None, Valve Set point, or Valve Stage.
Screen Definitions – SET
Set Unit Set points
SET UNIT SPs (1)
Unit Enable = OFF
Unit Mode = COOL
Source = KEYPAD
Unit Enable settings can be OFF and ON as determined from
the Unit Enable set point.
Unit Enable is an external signal or a keypad setting that keeps
the unit off 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 set point to be used.
• ICE w/GLYCOL, used with ice storage systems,
allows changing from chilled glycol operation to lower
temperature ICE operation. In ICE, the unit runs at full
load until the ICE set point is reached, at which time the
unit shuts off. A three-position switch wired to terminals
#28 and #38 initiates the change from glycol cooling to
making ice. (See wiring diagrams on page 8 or 9.)
Summary of Contents for IOM 1322-1
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Page 74: ...IOM 1322 1 WATER COOLED SCROLL COMPRESSOR 74 www DaikinApplied com Troubleshooting Chart...
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