Installation, Operation & Maintenance Manual
IM-225
7
Speed Control Options: ODP & TENV Motors (cont.)
4.
Remote Mounted Dial, RMD (Optional Feature)
– A wall mounted dial allows the fan to be controlled from within the building
by sending the motor a 0-10V DC option. This option includes a 115V or 230V (depending upon the motor voltage selected)
to 24V AC transformer mounted in the NEMA electrical enclosure. On models ACXD, ATD/R and ATDW/R the
junction box for the transformer will be located within the fan motor enclosure/weather cover. On model SCDD,
the junction box for the transformer will be located on the exterior of the fan.
With this option a 3 wire control cable must be field supplied and wired from the 24V AC transformer box to the
remote location of the controller. In addition, a standard 2x4 single gang electrical junction box (by others) is
required to mount the controller. The maximum distance from the remote mounted controller to the motor is
100 feet. Distances greater than this could cause a loss of the signal to the motor and result in unstable motor
performance.
On the back of the remote mounted dial there is a small switch that will allow the user to change the output of the remote
mounted dial. The settings of the switch are 0-10V or 2-10V. A label on the rear of the controller’s printed circuit board describes
the settings. The motor will run regardless of which setting the dial is at, but because the motor operates off of a 2-10V DC
signal, it will be off when a 0-1.9V DC signal is present. If the user requires the remote mounted dial to turn off the motor, the
dial should be set at 0-10V DC.
The field supplied 3 wire control cable connections from
the transformer box to the remote mounted dial must be
made as shown in table to the right:
The user should verify that the dial is properly working
by adjusting the dial and checking that the motor speed
changes accordingly. The voltage at the dial should also be
verified. 24V AC should be present across terminal 1 and 2.
Terminals 1 and 3 should have a DC voltage in the range of
0-10V DC, which should vary as the dial is adjusted.
Note that the motor mounted dial acts as a speed reference for this option. In order to have the full speed control range
available for a given fan/motor combination, the motor mounted dial must be turned all the way in the CW direction or to the
maximum RPM available.
Figures 1, 2 and 3 are detailed wiring diagrams for the Remote Mounted Dial option.
Always disconnect power before inspection or maintenance.
Although motor may be off and not running when a 0-1.9V DC
signal is present, high voltage will still be present at the motor.
CAUTION
DIAL OUTPUT
SELECTION SWITCH
3 WIRE CONTROL CABLE
CONNECTION TERMINALS
Note:
This section refers to motors 67001001, 67001003, 67001004, 67001005,
67001008, 67001015, 67001103, 67001104, 67001105, 6700115, 67001701,
67001703, 67001704, 67001705, 67001715, 67002101, 67002107, 67002205.
Connection in
Transformer Box
Description
Terminal on
Back of Dial
Yellow/White
Common
1
Blue/Black
24V AC
2
Red
0-10V DC
3
