Installation and Maintenance Manual

ECM Overview and Setup
68 UNT-SVX07D-EN
b. The input impedance of the thermistor circuit must
be set correctly (the
 parameter should be set
to
 for CSTI units).
c. The temperature sensed is higher than the

parameter.
d. The
 parameter is higher than the 
parameter.
e. The temperature is not in the dead-band between
the
 parameter and the  parameter (in
this case, previous state will be retained).
4. The customer thermostat is properly hooked up the
input strip 1TB3, and is requesting heating input (V2)
based on the customer heating set point being higher
than the space temperature.
5. The heating input on 1TB3 will drive the main
c
hangeover coil IF conditions 1–4 are satisfied, but will
always drive the auxiliary coil valve (if present).
Electric heat will be locked out (where present) if hot
water is available since SW4 will be factory set to “ON”
in these units.
SW4 selects the electric heat loc
kout function, where we
will lock out the electric heat circuit based on either:
1. The presence of hot water in the changeover coil
section (if the
 parameter is set to ).
2. Abnormal behavior of the fan/s (if the
 parameter
is set to ).
3. Or a combination of both the presence of hot water or
ab
normal behavior of the fan/s (if the
 parameter
is set to ).
4. The preceding three examp
les depend on the
inference of the engine board that hot water is present.
In this case, “hot” water is determined if:
a. The temperature sensed is higher than the

parameter.
b. The
 parameter is higher than the 
parameter.
c. The temperature is not in the dead-band between
the
 parameter and the  parameter (in
this case, previous state will be retained).
d. The input impedance of the thermistor circuit must
be set correctly (the
 parameter should be set
to
 for CSTI units).
Configuring the ECM Engine Board
Every Trane Fan-Coil or Cabinet Heater unit with BLDC
motors will have modules specifically configured at the
factory for the operation of that unit. The ECM engine
configuration label is affixed to the low-voltage access lid
on the outside of the control panel (see Figure 26, p. 58
and Figure 31, p. 68). The ECM engine label may be on the
back-side of the low voltage access lid, depending on the
unit configuration.
The serial number of each unit and the custom
configuration settings specific to that unit will be printed
on the label for convenient matching of labels/settings to
specific units. Programming a unit with the settings from
another unit will result in abnormal operation. The label
contains four important sections:
1. How to enter the configuration menu
2. The description and meaning of the Error Codes
3. The description and meaning of the status display
4. The parameter names and values specific to that unit
Note: This label is provided for reference only, as an
example, and should not be used to configure the
unit.
Figure 31. ECM engine label
UNT-SVX07_-EN.book Page 68 Friday, April 27, 2012 9:40 AM