Specifications

TY Series 60Hz - HFC-410A Submittal Data Eng/I-P
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Service Department at 1-405-745-6000 for specifi c information on the current design and specifi cations. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties,
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Page ______ of ______Revised: 30 January, 2015LC992 - 27
ECM Blower Control
The ECM fan is controlled directly by the DXM2 control
board that converts thermostat inputs and CFM settings
to signals used by the ECM motor controller. To take full
advantage of the ECM motor features, a communicating
multi-stage thermostat should be used (ATC32U**).
The DXM2 control maintains a selectable operating airfl ow
[CFM] for each heat pump operating mode. For each
operating mode there are maximum and minimum airfl ow
limits. See the ECM Blower Performance tables for the
maximum, minimum, and default operating airfl ows.
Airfl ow levels are selected using the confi guration
menus of a communicating thermostat (ATC32U**) or
confi guration/diagnostic tool (ACDU**). The confi guration
menus allow the installer to independently select and
adjust the operating airfl ow for each of the operating
modes. Air fl ow can be selected in 25 CFM increments
within the minimum and maximum limits shown in the
ECM Blower Performance Table. The blower operating
modes include:
• First Stage Cooling (Y1 & O)
• Second Stage Cooling (Y1, Y2, & O)
• First Stage Cooling in Dehumidification Mode
(Y1, O, & Dehumid)
• Second Stage Cooling in Dehumidification Mode
(Y1, Y2, O, & Dehumid)
• First Stage Heating (Y1)
• Second Stage Heating (Y1 & Y2)
• Third Stage (Auxiliary) Heating (Y1, Y2, & W)
• Emergency Heating (W with no Y1 or Y2)
• Fan (G with no Y1, Y2, or W)
It is necessary to use the ATC32U** communicating
thermostat to engage the Auto Dehumidifi cation feature
on units with variable speed pumps. These units utilize
the ‘H’ terminal on the DXM2 as an input for an ambient
temperature switch. Units without the variable speed
pump option may use the ‘H’ terminal on the DXM2
controller or the ATC32U** communicating thermostat
to initiate the Auto Dehumidifi cation mode. Refer to the
DXM2 AOM for more information (part #97B0003N15).
The ECM motor includes “soft start” and “ramp down”
features. The soft start feature is a gentle increase of motor
rpm at blower start up. This creates a much quieter blower
start cycle.
The ramp down feature allows the blower to slowly
decrease rpm to a full stop at the end of each blower
cycle. This creates a much quieter end to each blower
cycle and adds overall unit effi ciency.
AIRFLOW SELECTION
CFM
HEAT STAGE 1 600
HEAT STAGE 2 750
AUXILIAR
Y HEAT 850
EMERGENCY HEAT 850
COOL STAGE 1 525
COOL STAGE 2 700
COOL DEHUMID 1 425
COOL DEHUMID 2 550
CONTINUOUS FAN 350
HEAT OFF DELAY 60
COOL OFF DELAY 30
PREVIOUS NEXT
Airfl ow Confi guration Screen on Communicating
Thermostat
The ramp down feature is eliminated during an ESD
(Emergency Shut Down) situation. When the DXM2 ESD
input is activated, the blower and all other control outputs
are immediately de-activated.
The ramp down feature (also known as the heating or
cooling “Off Delay”) is fi eld selectable by the installer. The
allowable range is 0 to 255 seconds.