Service manual

30
ClimateMaster Water-Source Heat Pumps
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Tranquility
®
Compact (TC) Series
Rev.: 02/06/15
ECM 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. Fan speeds are selected
with DIP switch settings. 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 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 for Tranquility
®
30 (TT) and Tranquility
®
20 (TS) 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.
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 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
Only DIP switch numbers 1 to 4 and 7 to 9 are used.
WARNING! When the disconnect switch is closed, high
voltage is present in some areas of the electrical panel.
Exercise caution when working with energized equipment.
 WARNING! 
illuminated at all times. Heating airfl ow is not affected.
NOTE: Do not select dehumidifi cation mode if cooling
setting is tap 1.