IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 62 www.DaikinApplied.com
Input
Control Source
Set Point
Remote
Input
BAS
Request
Unit
Enable
OFF X X X X OFF
X SWITCHES OFF X X OFF
ON SWITCHES ON X X ON
ON KEYPAD X OFF X OFF
ON KEYPAD X ON X ON
ON NETWORK X X OFF OFF
ON NETWORK OFF X X OFF
ON NETWORK ON X ON ON
Unit Mode
The overall operating mode of the chiller is set by the Unit
Mode Set Point with options of COOL, COOL w/Glycol, ICE w/
Glycol, and TEST. This set point can be altered by the keypad,
BAS, and Mode input.
Changes to the Unit Mode Set Point are controlled by two
additional set points.
• Available Modes Set Point: Determines the operational
modes available at any time with options of COOL, COOL
w/Glycol, COOL/ICE w/Glycol, ICE w/Glycol and TEST
• Control Source Set Point: Determines the source that can
change the Unit Mode Set Point with options of KEYPAD,
NETWORK, or SWITCHES.
When the Control source is set to KEYPAD, the Unit Mode
shall stay at its previous setting until changed by the operator.
When the Control source is set to BAS, the most recent BAS
mode request shall go into eect even if it changed while the
Control source was set to KEYPAD or DIGITAL INPUTS.
Changing the Unit Mode Set Point can be accomplished
according to the following table.
NOTE: An “x” indicates that the value is ignored.
Control Source Set
Point
Mode
Input
BAS
Request
Available Modes
Set Point
Unit Mode
X X X X COOL COOL
X X X X COOL w/Glycol COOL w/Glycol
SWITCHES OFF X X COOL/ICE w/Glycol COOL w/Glycol
SWITCHES ON X X COOL/ICE w/Glycol ICE w/Glyco
KEYPAD X COOL w/
Glycol
X COOL/ICE w/Glycol COOL w/Glycol
KEYPAD X CE w/
Glyco
X COOL/ICE w/Glycol ICE w/Glyco
NETWORK X X COOL COOL/ICE w/Glycol COOL w/Glycol
NETWORK X X ICE COOL/ICE w/Glycol ICE w/Glycol
X X X X ICE w/Glyco ICE w/Glycol
X X X X TEST TEST
Unit Test Mode
The unit test mode allows manual testing of controller outputs.
Entering this mode requires the following conditions:
• Unit Switch = OFF
• Manager password active.
• Available Unit Mode set point = TEST
A test menu can then be selected to allow activation of the
outputs. It shall be possible to switch each digital output ON or
OFF and set the analog outputs to any value.
Circuit Available
A circuit is available if the circuit switch is in the on position
and no circuit alarms are active. Timers that delay startup or
staging of a circuit do not render it unavailable.
After powering up the unit, the motor protector modules may
not reset for up to 150 seconds. After the control is powered
up, no compressor can start for 150 seconds. Motor protect
inputs are ignored during this time so as to avoid tripping a
false alarm.
An adjustable start to start ice delay timer will limit the
frequency with which the chiller may start in Ice mode. The
timer starts when the rst compressor starts while the unit is in
ice mode. While this timer is active, the chiller cannot restart in
Ice mode. The time delay is user adjustable.The ice delay timer
may be manually cleared to force a restart in ice mode. A set
point specically for clearing the ice mode delay is available.
In addition, cycling the power to the controller will clear the ice
delay timer.
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