ClimateMaster TYH/V 024 - 060 60Hz - HFC-410A Manuel d'installation télécharger pdf (Page 27)

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THE SMART SOLUTION FOR ENERGY EFFICIENCY

Tranquility

22 (TY) Series

Rev.: 12/17/14

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 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 highly recommended that ATC32U** or ACDU**

be used to set dehumidiﬁ cation mode electronically.

Dehumidiﬁ cation can NOT be selected when using a

non-communicating thermostat with a vFlow™ unit with

Internal Flow Controller (pump). For dehumidiﬁ cation

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 efﬁ ciency.

Special Note for AHRI Testing:

To achieve rated airﬂ ow for AHRI testing purposes, it is

necessary to change the CFM settings to rated airﬂ ow.

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.

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ClimateMaster TYH/V 024 - 060 60Hz - HFC-410A Manuel d'installation Page 27

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