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RJ SERIES INSTALLATION MANUAL
Cooling Cycle
On a call for cooling, the blower enable output and accessory
output 2 will turn on immediately after the random start delay timer
has been satisfied. If the compressor short cycle time delay has
been satisfied, the compressor will turn on after the blower enable
and accessory output 2 are on and the fixed compressor start
delay timers have been satisfied.
ECM2 Blower Operation
Fan speeds will be selected through the user interface or the
facility management system. There will be a total of 12 speeds
selectable with only three being selected at any one time. The
lowest numbered speed selection set to ON will select the low-
speed fan setting, the middle selection set to ON will select the
medium-speed fan setting and the highest selection set to ON
will select the high-speed fan setting. If all selections are set to
OFF the software shall select speed setting 10 for low-speed,
11 for medium-speed, and will select speed setting 12 for high
speed. If only one selection is set to ON, that selection will set the
low-speed fan setting, the medium-speed setting will be 11, and
the high-speed setting will be speed 12. The maximum low-speed
setting will be speed 10 and the minimum high-speed setting will
be speed 3.
In addition there is a low limit setting in the software to prevent the
ECM2 fan speed from being set below acceptable limits for each
unit size.
Network Enabled Output/Electric Heat Output (BO-5)
This output can be enabled by the BAS network for use as
needed in the field. There is a soft switch in the application
that can be enabled through the BAS or MUI that will allow
this output to be used for auxiliary electric heat. A second
soft switch is available that can be enabled through the BAS
or MUI that will interlock this output with the fan proving input
(BI-6) for operating electric heat. If the fan proving input is
open when the interlock is enabled, the Electric Heat Output
(BO-5) will be immediately disabled.
If this output is enabled for electric heat then it shall be
used as a backup for the compressor in the event that a
compressor fault occurs during heating operation.
MUI Alarm History Reporting
If a fault occurs the fault will be recorded in history for display
on the medium user interface in the History Menu. Each
fault type will be displayed in the history menu with a number
between 0 and 3. A reading of 3+ will mean that fault has
occurred more than three times in the past. The history menu
can be cleared with a power cycle only. Alarm date and time
are not included in the history.
Optional Controls - FX10 cont.
