Ecm Blower Control - ClimateMaster Tranquility 30 Digital TE Series Installation, Operation & Maintenance Instructions Manual

Residential horizontal, vertical & downflow packaged geothermal heat pumps

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Installation operation & maintenance (72 pages)

Table of Contents

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, an iGate™ communicating multi-

stage thermostat should be used (ATC32U**).

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 table (Table 10) for

the maximum, minimum, and default operating airflows.

Airflow levels are selected using the configuration menus of

a communicating thermostat (ATC32U**) or diagnostic tool

(ACDU**). 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

Table 10. 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 Dehumidification feature on

units with Internal Flow Controllers. Units with Internal Flow

Controllers utilize the 'H' terminal on the DXM2 as an input

for an ambient temperature switch. Units without the Internal

Flow Controller option use the 'H' terminal on the DXM2

controller to initiate the Auto Dehumidification 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 efficiency.

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 duration of the "ramp down" periods are adjustable from

0 seconds to 255 seconds. This adjustment is available

in the Aiflow Selection screen using the communicating

thermostat or configuration/diagnostics tool, see Figure 29.

Tranquility

30 Digital ( TE) Series IOM - 60Hz HFC-410A

Special Note for AHRI Testing: To achieve rated airflow for

AHRI testing purposes, it is necessary to change the CFM

settings to rated airflow.

Figure 29: Airflow Configuration Screen on

Communicating Thermostat

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