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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
C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Tr a n q u i l i t y
®
3 0 ( T T ) S e r i e s
R e v. : 0 7 / 1 8 / 1 3
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. 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.
Heating Settings:
The heating setting determines the
heating CFM. 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 +/-
5%. The +/- settings are used to “fi ne tune” airfl ow
adjustments. The TEST setting runs the ECM motor at
400 cfm/ton, 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 operatewith
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.
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.
