2 • Control Link ACC I&O Manual 026-4704 Rev 6
2.2. Dewpoint Sensor
(P/N 814-6115)
The Control Link ACC uses an external dewpoint
sensor (Figure 2-2) to measure the dewpoint of the
outside air next to the case doors. This sensor is
typically mounted directly above or to the side of the
case doors.
The dewpoint sensor is supplied in a mountable
enclosure with a 3-pin connector that attaches the
Control Link ACC to the dewpoint sensor (use a
3-wire 22AWG cable harness - Belden# 8771
P/N 135-8771 not supplied). The push button will
increase the offset in 1-degree (Celsius) (1.8°F)
increments indicated by the LED.
When Control Link ACC controllers are net-
worked together via MODBUS, a single dewpoint
sensor connected to one Control Link ACC may be
shared by multiple Control Link ACC controllers.
2.3. Door Frame
Temperature Sensor
(P/N 281-0002)
In addition to the indoor air dewpoint, the Control
Link ACC also factors in the value of the temperature
of the case door frame using a mounted temperature
sensor (Figure 2-3). The door frame temperature
sensor should be mounted to the coldest surface of the
door frame. The door frame temperature sensor is
supplied with a 16-foot (4.88-meter) two-wire cable,
which plugs into the matching 2-pin connector on the
bottom, low voltage end of the Control Link ACC
(side closest to the LEDs).
Figure 2-2 - Dewpoint Sensor (814-6115)
Figure 2-3 - Door Frame Temp Sensor (281-0002)
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