Trane VUV Installation, Operation And Maintenance Manual page 64

ECM Overview and Setup
WARNING
Safety Alert!
You MUST follow all Instructions below. Failure to do so
could result in death or serious injury. All settings take
effect immediately, including fan start-up, enabling of
electric heat. Caution should be taken to stay clear of
hazardous voltages, moving parts and electric heat
elements while making adjustments to the motor
control board. If it is not practical to stay clear of these
areas during adjustment of the motor control board,
please contact Trane Global Parts for configuration kit
that allows easy powering of the motor control board
outside of the unit with a 9V battery.
A courtesy 10-Vdc supply is provided that can support a 10-mA
draw. The use of a 1K or a 10K potentiometer is recommended,
and only a stand-alone potentiometer (not shared with any
other electrical system) should be employed. When a simple
potentiometer is used as depicted in
Vflr
setting will define a null-zone (off).
The typical connection is depicted in
however, please consult the unit schematic for the most
updated instruction, as this is provided as reference only.
Figure 77. Typical connection
Adjusting Optional Auto-Changeover
Function on CSTI Units
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
64
Figure 77, p. 64, the
Figure 77, p. 64;
The motor control board provides additional temperature
controlled logic to help coordinate certain electric-heat and
valve logic functions:
• On units with electric heat and a changeover coil, the motor
control board and adapter boards are pre-configured to
cause hydronic heat and electric heat to be mutually
exclusive:
– On units with ComfortLink™ controls (Tracer® ZN
controllers) or BACnet® controls (UC400-B/Symbio™
400-B), the Tracer® ZN controller board will serve as
the primary logic to select the electric heat only if hot
water is not available, but the motor control board will
service as a backup lockout.
– On units with Customer Supplied Controllers (CSTI
units), the motor control board and CSTI board will
serve as the primary lockout.
• On CSTI units selected with a changeover coil
configuration, the motor control board is factory configured
to work in conjunction with the CSTI adapter board to
provide a useful auto-changeover function. Traditionally, a
fixed setpoint bi-metallic disc temperature switch is used to
provide changeover with customer controls; however, the
motor control board has defeatable and configurable bi-
metallic disc temperature switch emulation when
combined with the CSTI adapter board. The motor control
board is preconfigured for typical values, so changeover
settings do not necessarily need to be changed.
Note: CSTI board does not support changeover function with
modulating valves.
– An NTC thermistor is supplied and affixed to the supply
pipes where applicable. The motor control board has
several settings that affect the operation of the
changeover function:
Fprv
• parameter should normally be set to
Ehfs
to use the changeover functions.
Ehl
• parameter should be chosen if the unit has a
changeover coil without electric heat.
EhFs
• parameter should be chosen if the unit has a
changeover coil with electric heat. Generally, this
will perform the same as the
addition, will disable heating function on electric
heat and on the changeover coil if there are fan
failures. The auxiliary heating coil function will
continue to operate and respond to the customer
heating request.
AiPU
• parameter should be set to
Out
to for ComfortLink or BACnet® controller units.
Ai2M
• parameter defines the temperature at which the
motor control board will close the triac onboard the motor
Fprv
control board (if
Ai2b
• parameter defines the temperature at which the
motor control board will open the triac onboard the motor
Fprv
control board (if
leaving a "gap" between the make and break value, we will
EHl
Ehl
parameter but in
In
for CSTI units and
parameter is set correctly).
parameter is set correctly). By
UV-SVX005G-EN
or