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ECM FAN MOTOR

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 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.

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 Thermidistat

output operates in reverse logic, and is

compatible with the dehumidifcation mode.

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.

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 GT-G (50YC) and GT-X (50YB)

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 speciﬁ cations catalog for the

speciﬁ c unit series and model to correlate speed tap

setting to airﬂ ow in CFM.

Heating settings: The heating setting determines

the heating CFM for GT-PX (50YD) and GT-PG

(50YE) units. This setting is not used for GT-G

(50YC) and GT-X (50YB) units. Tap 1 is the lowest

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

Consult 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 speciﬁ cations

catalog for the speciﬁ c unit series and model to

correlate speed tap setting to airﬂ ow in CFM.

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