![ClimateMaster Tranquility 22 TZ Series Installation Operation & Maintenance Download Page 32](http://html1.mh-extra.com/html/climatemaster/tranquility-22-tz-series/tranquility-22-tz-series_installation-operation-and-maintenance_2624743032.webp)
Tranquility
®
22 (TZ) Series
R e v. : A u g u s t 4 , 2 0 2 1
C l i m a t e M a s t e r Wa t e r-S o u rc e H e a t P u m p s
32
C L I M AT E M A S T E R WAT E R - S O U R C E H E AT P U M P S
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 (ATC32U03C).
The DXM2 control maintains a selectable operating
airflow [CFM] for each heat pump operating mode. For
each operating mode there are maximum and minimum
airflow limits. See the ECM Blower Performance tables
for the maximum, minimum, and default operating
airflows.
Airflow levels are selected using the configuration
menus of a communicating thermostat (ATC32U03C)
or diagnostic tool (ACDU03C). The configuration menus
allow the installer to independently select and adjust the
operating airflow for each of the operating modes. Air
flow 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 highly recommended that ATC32U03C or ACDU03C
be used to set dehumidification mode electronically.
Dehumidification can
NOT be selected when using a
non-communicating thermostat with a vFlow
®
unit with
Internal Flow Controller (pump). For dehumidification
settings on other units using the non-communicating stat,
refer to DXM2 AOM (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 efficiency.
Special Note for AHRI Testing:
To achieve rated airflow for AHRI testing purposes, it is
necessary to change the CFM settings to rated airflow.
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 field selectable by the installer. The
allowable range is 0 to 255 seconds.