Document Part # 026-4703 Rev 8 10-JUN-2009
Page 16 of 18
©2009 Emerson Climate Technologies Retail Solutions, Inc. This document may be photocopied for personal use.
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Installation Instructions: Control Link ACC Anti-Condensate Controller System
technical bulletin
General Status LED
The General Status LED (STATUS) blinks green to indicate the controller is powered up and functioning nor-
mally, and whether or not there are any alarm conditions.
If the controller is functioning normally, the STATUS LED will blink once every two seconds. If there is an error
condition, it will blink at different rates to indicate the active error condition (see the
Error Modes
section
below).
Tx and RX Status LEDs
If the Control Link ACC is being networked with other Control Link ACCs via its MODBUS network connec-
tion, the Tx and Rx LEDs blink to indicate transmission and receipt of network messages. On a properly net-
worked Control Link ACC, the Rx LED should blink about once every 15 seconds. If a Control Link ACC has a
dewpoint sensor, you should also see the Tx LED blink. If these LEDs do not blink, there may be a problem with
the MODBUS network connection.
Error Modes
The Control Link ACC has several error modes it will enter when failures occur. If any of the error modes below
occur, the green STATUS LED will blink at a rate specific to the error condition. For each error mode, note the
priority level — if more than one error mode is active, the LED blink rate will only show the error condition with
the highest priority (priority #1 is the highest, and priority #5 is the lowest).
Priority 1: FAIL THERMAL SHUTDOWN
The Control Link ACC has an internal temperature sensor that will turn OFF the heater if the Triac driving the
heater exceeds a temperature above 105°C. During thermal shutdown the STATUS LED will blink 5 times,
pause, and repeat. Thermal shutdown will automatically clear itself when the Triac internal temperature falls
below 102°C.
If a Control Link ACC experiences a large number of thermal shutdowns, there may be a problem with heat sink-
ing on the Control Link ACC. Make sure the metal tab on the back of the Control Link ACC is mounted securely
against the metal in the mullion for proper heat conduction.
Priority 2: TEMP SENSOR FAILURE
This error occurs when the Control Link ACC is not receiving a valid temperature value from the door tempera-
ture sensor. When this condition occurs, the Control Link ACC will revert to an open loop control method com-
monly used in E2 & PMAC. While operating in this mode, the Control Link ACC will be controlled according to
the dewpoint within the store.
Dewpoint
Output
65°F (18°C)
100%
55°F (12.8°C)
75%
45°F (7.2°C)
50%
35°F (1.7°C)
25%
25°F (-3.9°C)
0%
