Trane Axiom DXH, Installation, Operation And Maintenance Manual

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WSHP-SVX014F-EN 37
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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 24Volt 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.
UC400B Controller
To inhibit operation of the compressor and fan for a
safety shutdown, it is necessary to break the wire (21A)
from the 24Volt transformer to the UC400B (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.
ZN524 Controller
To inhibit operation of the compressor and fan for a
safety shutdown, it is necessary to break the wire (21X)
from the 24Volt transformer to the 1TB1 terminal block.
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.
Hole Plug Installation
1. Locate two Hayco plastic plugs enclosed with the
Installation, Operation and Maintenance manual.
2. Use these plugs to plug the two shipping bolt holes
in the bottom of the units after shipping bolt
removal.
Airflow Adjustment
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Horizontal - Units with Deluxe 24V or
Tracer® ZN524 controls
For horizontal sizes EXHF 006-070 and DXHF 024-070,
the ECM is programmed for constant CFM over a range
of static pressures. The DIP switch on the ECM control
board allows for a quick fan speed adjustment to
optimize unit performance. The factory default setting
is Profile B.
Figure 29. ECM control board
To adjust the cfm, set the DIP switch located in the
control box to the desired profile setting.
Profile A = 110% of rated airflow
Profile B = 100% of rated airflow
Profile C = 90% of rated airflow
Profile D = 80% of rated airflow
Horizontal - Units with Deluxe 24V,
Tracer® ZN524 or Tracer® UC400
controls
Installations at higher altitudes may require an
adjustment to the fan speed setting to achieve proper
airflow. A second control board located in the control
box is provided with DIP switches to allow a quick
adjustment. Using the chart below, select the DIP
switch setting based on the job site’s altitude. If a lower
CFM is needed, set DIP switch 4 to ON.
IIn nsstta alllla attiio on n