RL SERIES INSTALLATION MANUAL
compressor output can be enabled. During low capacity
compressor operation the ECM2.3 blower will operate in
medium speed and will operate in high speed when the
compressor is operating at full capacity.
Thermostat Control Mode
In thermostat mode the compressor will be cycled based on
Y1 and Y2 calls from a room thermostat. When the control
receives a Y1 command (BI-7) from the thermostat the low
capacity compressor output (BO2) will be enabled and the
ECM2.3 blower will operate in medium speed. When the
control receives a Y2 command (BI-8) from the thermostat
the full capacity compressor output will be enabled and the
ECM2.3 blower will operate in high speed. During the heating
cycle the reversing valve will be commanded into the off
position.
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.
ECM2.3 Blower Operation
Blower 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 blower setting, the middle selection set to ON will select the
medium-speed blower setting and the highest selection set to ON
will select the high-speed blower 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 blower 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
ECM2.3 blower 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 blower proving input (BI-6) for operating electric
heat. If the blower 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 FX10 Microprocessor Control cont.
To Next Page
Loading...
Need help?
General
