Document Part # 026-4703 Rev 8 10-JUN-2009
Page 14 of 18
©2009 Emerson Climate Technologies Retail Solutions, Inc. This document may be photocopied for personal use.
Visit our website at http://www.emersonretailsolutions.com/ for the latest technical documentation and updates.
Installation Instructions: Control Link ACC Anti-Condensate Controller System
technical bulletin
Step 7 - Set the Setpoint Temperature Offset
Jumper(s)
The Control Link ACC seeks to maintain a constant
minimum difference between the dewpoint of the
outside air and the temperature of the door frame.
You may specify how big this difference will be by
setting the temperature offset jumpers on the dew-
point sensor or the Control Link ACC board.
The offset jumper on the dewpoint sensor is located
on the circuit board on the underside of the sensor
enclosure (use needle-nose pliers to reach the
jumper). The offset jumper on the Control Link
ACC is located on the bottom end of the controller
board near the dip switches (see
Figure 20
).
The offset jumpers determine the number of degrees
(in Celsius) that will be added to the value of the
dewpoint sensor to determine the target temperature
of the door frame. For example, if the current dew-
point is 5°C and the jumpers are set to a medium
offset of 2°C, the Control Link ACC will control the
heaters to achieve a door frame temperature of 7°C.
As the dewpoint rises and falls, the door frame temperature setpoint will also rise and fall, so that the door frame
temperature will always stay slightly above the current dewpoint.
The Control Link ACC uses jumpers on both the
dewpoint sensor and the Control Link ACC board
itself to determine the value of the temperature off-
set. The Control Link ACC prioritizes them in the
following ways:
•The dewpoint sensor’s temperature offset jumper takes
priority over all Control Link ACCs. The setting of
the dewpoint sensor’s jumper is used by all Control
Link ACCs on the network that are using that sen-
sor for its dewpoint provider.
•If the dewpoint sensor’s temperature offset jumper is
removed, all Control Link ACCs will use the tem-
perature offset specified by each Control Link
ACC’s own temperature offset jumper.
This priority structure is designed to make it easier
for temperature offsets to be changed in the field (by
Figure 20 - Setpoint Jumper Location and Settings
H M L
H M L
H M L
OFFSET JUMPERS
ACC
OFFSET JUMPERS
DEWPOINT SENSOR
OFFSET JUMPERS
ACC
DEWPOINT
DI
SC
ON
TI
NU
ED
Figure 21 - Setpoint Jumper Location and Settings
(Discontinued)
