ClimateMaster DC Series Installation Manual download pdf (Page 24)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

ECM Blower Control

The ECM fan is controlled by an interface board that

converts thermostat inputs and ﬁ eld selectable CFM

settings to signals used by the ECM motor controller.

Units manufactured before July 2005 have version I (P/N

69243707). Units manufactured after July 2005 have version

II (P/N 17B0019N01). Fan speeds are selected with jumpers

for version I or via a nine position DIP switch for version II.

To take full advantage of the ECM motor features, a multi-

stage thermostat should be used (2-stage heat/2-stage

cool or 3-stage heat/2-stage cool).

Note: Power must be off to the unit for at least three

seconds before the ECM motor will recognize a speed

change. The motor will recognize a change in the CFM

Adjust or dehumidiﬁ cation mode settings while the unit is

powered.

There are four different airﬂ ow settings from lowest airﬂ ow

rate (speed tap 1) to the highest airﬂ ow rate (speed tap 4).

The charts below indicate settings for both versions of the

ECM interface board, followed by detailed information for

each setting.

Cooling Settings: The cooling setting determines the

cooling (normal) CFM for all units with ECM motor.

Cooling (normal) setting is used when the unit is not in

dehumidiﬁ cation mode. This setting also determines the

heating CFM for Genesis (GS) units. Tap 1 is the lowest

CFM setting, while tap 4 is the highest CFM setting. To

avoid air coil freeze-up, tap 1 may not be used if the

dehumidiﬁ cation mode is selected. Consult submittal data

or speciﬁ cations catalog for the speciﬁ c unit series and

model to correlate speed tap setting to airﬂ ow in CFM.

Heati

ng Settings

: The heating setting determines the

heating CFM for Tranquility 27™ (TT) and Tranquility 20™

(TS) units. This setting is not used for Genesis (GS) units.

Tap 1 is the lowest CFM setting, while tap 4 is the highest

CFM setting. Consult submittal data or speciﬁ cations

catalog for the speciﬁ c unit series and model to correlate

speed tap setting to airﬂ ow in CFM.

Auxiliary/Emergency Heat Settings: The auxiliary/

emergency heat setting determines the CFM when the unit

is in auxiliary heat or emergency heat mode. This setting

is used for residential units with internal electric heat.

When auxiliary electric heat is energized (i.e. compressor

and electric heat), the greater of the auxiliary/emergency

or heating setting will be used. A “G” (fan) signal must be

present from the thermostat for electric heat to operate.

Consult the submittal data or speciﬁ cations catalog for the

speciﬁ c unit series and model to correlate speed tap setting

to airﬂ ow in CFM.

CFM Adjust Settings: The CFM adjust setting allows

four selections. The NORM setting is the factory default

position. The + or – settings adjust the airﬂ ow by +/- 15%.

The +/- settings are used to “ﬁ ne tune” airﬂ ow adjustments.

The TEST setting runs the ECM motor at 70% torque, which

causes the motor to operate like a standard PSC motor, and

disables the CFM counter.

Dehumidiﬁ cation Mode Settings: The dehumidiﬁ cation

mode setting provides ﬁ eld selection of humidity control.

When operating in the normal mode, the cooling airﬂ ow

settings are determined by the cooling tap setting above.

When dehumidiﬁ cation is enabled there is a reduction in

airﬂ ow in cooling to increase the moisture removal of the

heat pump. Consult submittal data or speciﬁ cations catalog

for the speciﬁ c unit series and model to correlate speed

tap to airﬂ ow in CFM. The dehumidiﬁ cation mode can be

enabled in two ways.

1. Constant Dehumidiﬁ cation Mode: When the

dehumidiﬁ cation mode is selected (via DIP switch or

jumper setting), the ECM motor will operate with a

multiplier applied to the cooling CFM settings (approx.

20-25% lower airﬂ ow). Any time the unit is running in

the cooling mode, it will operate at the lower airﬂ ow

to improve latent capacity. The “DEHUM” LED will be

illuminated at all times. Heating airﬂ ow is not affected.

NOTE: Do not select dehumidiﬁ cation mode if cooling

setting is tap 1.

2. Automatic (Humidistat-controlled) Dehumidiﬁ cation

Mode: When the dehumidiﬁ cation mode is selected

(via DIP switch or jumper setting) AND a humidistat is

connected to terminal DH (version II) or HUM (version

I), the cooling airﬂ ow will only be reduced when the

humidistat senses that additional dehumidiﬁ cation is

required. The DH (or HUM) terminal is reverse logic.

Therefore, a humidistat (not dehumidistat) is required.

The “DEHUM” LED will be illuminated only when

the humidistat is calling for dehumidiﬁ cation mode.

Heating airﬂ ow is not affected. NOTE: Do not select

dehumidiﬁ cation mode if cooling setting is tap 1.

Section 10 - Packaged IOM 24 4/24/09 3:16:52 PM

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ClimateMaster DC Series Installation Manual Page 24

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