8 Unit Keys
8.1 OPTIONS Key
The 'OPTIONS' key is used to scroll through the list of
options by repeatedly pressing the 'OPTIONS' key. The
options may be changed using the 'UP ARROW‘ and
'DOWN ARROW' keys. After an option is changed the
'ENTER/ADV' key must be pressed to enter the setting
into memory. The options are displayed in the following
order:
One of the display message languages maybe selected.
The System Switches can be set to allow both systems
to run, stop both systems or only one system to run.
The chilled liquid type can be set for water or glycol.
When programmed for 'LOCAL' an ISN, Bacnet or
Modbus control can be used to monitor only. The
microprocessor will operate on locally programmed
values and ignore all commands from the remote
devices. The chiller will communicate and send data to
the remote monitoring devices.
With 'REMOTE’ selected an ISN, Bacnet or Modbus can
be used to control the chiller. This mode will allow the
ISN to control the following items: Remote Start/Stop,
Leaving Liquid Setpoint, Load Limit, Mode (Cooling or
Heating) and History Buffer Request. For Bacnet or
Modbus the following items can be controlled: Leaving
Liquid Setpoint, Load Limit and Mode (Cooling or
Heating). If the unit receives no valid ISN transmission
for 5 minutes, it will revert back to the locally
programmed values.
Display messages can be shown in Imperial units (°F or
PSI) or SI units (°C or Bar).
System1or system 2 can be selected as the lead system
under manual or the microprocessor will determine
which system is assigned to the lead and lag under
automatic. A new lead/lag assignment is made
whenever all compressors are shut down in automatic.
The microprocessor will then assign the lead to the
system compressor with the shortest average run time.
1-31
Form 201.26.OI1(11/09)
L OCAL / REMOT E MODE
LOCAL
L OCAL / REMOT E MODE
REMOT E
or
DI SPLAY UNI T S
IMPERIAL
DI SPLAY UNI T S
SI
or
LEAD/ LAG CONTROL
MANUAL SYS 1 LEAD
LEAD/ LAG CONTROL
MANUAL SYS 2 LEAD
LEAD/ LAG CONTROL
AUTOMATI C
or
or
DI SPLAY LANGUAGE
ENGLI SH
SYS 1 SWI TCH ON
SYS 2 SWI TCH ON
SYS 1 SWI TCH OFF
SYS 2 SWI TCH OFF
SYS 1 SWI TCH ON
SYS 2 SWI TCH OFF
SYS 1 SWI TCH OFF
SYS 2 SWI TCH ON
or
or
or
CHI L LED L I QUI D
WA T E R
CHI L LED L I QUI D
GL Y COL
or
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