External Smoke Detection Wiring To; Unit; Deluxe Controller; Symbio™ 400-B/Uc400-B - Trane Axiom EXH Series Installation, Operation And Maintenance Manual

External Smoke Detection Wiring
to Unit

Deluxe Controller

To inhibit operation of the compressor and fan for a safety
shutdown, it is necessary to break the wire (21X) from the
24 Volt transformer to the 1TB1 terminal block. This can be
done with the dry contacts of a relay. When that connection
is opened, it terminates voltage to both the deluxe
controller and the thermostat, which stops/prevents all
control function to the fan and compressor.
Symbio™ 400-B/UC400-B Controller
To inhibit operation of the compressor and fan for a safety
shutdown, it is necessary to break the wire (21A) from the
24 Volt transformer to the Symbio 400-B/UC400-B (1U1).
This can be done with the dry contacts of a relay. When
that connection is opened, it terminates the power voltage
to the controller, which stops/prevents all control function
including the fan and compressor.

Airflow Adjustment

WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live and exposed rotating components.
Have a qualified or licensed service individual who
has been properly trained in handling exposed
rotating components, perform these tasks.

Units with Deluxe 24V controls

The ECM is programmed for constant torque and delivers
airflow similar to a PSC motor while operating at a higher
efficiency.
WSHP-SVX014J-EN
Figure 33. ECM control box
Figure 34. ECM control board
1. Potentiometer will be used to adjust the PWM output
2. Seven segment display
Using a screwdriver, the potentiometer will be used to
adjust the PWM output from 20% to 100% PWM.
Increasing the PWM will increase the motor speed. When
setting the airflow for air balancing, the high-speed terminal
(GH) must have 24 Vac signal. This will ensure that the
PWM output will be adjusted for the full load airflow.
The display will show the commanded motor speed
percentage. If running on low speed (GL), the low-speed
value will be displayed. If running in GH the high-speed
value will be displayed. If both GH and GL input signals are
present, the PWM output value will be the GH value.
Note: ECM control board is only on units with Deluxe 24V
controls. Tracer® TU is used to adjust fan speed on
units with Symbio™ 400-B/UC400-B controls.
Installation
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