Service manual

31
climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Tranquility
®
Compact (TC) Series
Rev.: 02/06/15
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.
The ramp down feature may be eliminated during an ESD
(Emergency Shut Down) situation when using a DXM unit
controller. A DPDT relay is required to break the line voltage to
the ECM motor during ESD. This relay can be wired as shown
below to eliminate the ramp down (and operation) of the ECM
blower motor.
To ‘ESD’ on DXM
To ‘R’ on DXM
ESD Signal
(eld input)
ECM Control