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Installation Instructions: Control Link ACC Anti-Condensate
Overview
The Control Link ACC Anti-Condensate Controller System is a stand-alone controller for anti-sweat
heaters in glass door cases. The Control Link ACC varies anti-sweat heat based on dewpoint and temp-
erature around the door frame, providing effective control of door sweat with the maximum amount of
energy savings.
Components
Control Link ACC (P/N 810-6101)
The Control Link ACC (Figure 1) handles all aspects
of anti-sweat heater control. The on-board processor
calculates the required heater ON time based on the
dewpoint and door temperature readings, and controls
an on-board Triac to activate and deactivate the heaters.
The controller is designed to mount in the mullion
between glass doors or in any other suitable electrical
enclosure, such as a raceway or on the top of the case.
The door frame temperature sensor and dewpoint sen-
sor are mounted remotely and connect to this controller
with cable harnesses.
Four LEDs can be viewed on the front of the plastic
enclosure. They indicate the general status, heater ON/
OFF state, MODBUS network transmit, and MODBUS
network receive.
Dewpoint Sensor (P/N 809-6112)
The Control Link ACC uses an external dewpoint sensor
(Figure 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 a12-foot jacketed cable with a four-wire pigtail con-
nects the Control Link ACC to the dewpoint sensor.
Document Part # 026-4703 Rev 8 10-JUN-2009
©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.
technical bulletin
Controller System
Figure 1 - Control Link ACC
Figure 2 - Dewpoint Sensor (6112)
Page 1 of 18
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Summary of Contents for Emerson Control Link ACC
- Page 1 The Control Link ACC Anti-Condensate Controller System is a stand-alone controller for anti-sweat heaters in glass door cases. The Control Link ACC varies anti-sweat heat based on dewpoint and temp- erature around the door frame, providing effective control of door sweat with the maximum amount of energy savings.
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Page 2: Mounting The Control Link Acc
Figure 4 - Control Link ACC Mounting The tab at the top end of the Control Link ACC (the end nearest the CPC logo) must be securely mounted against a large heat-conductive surface. This tab has a metal backing which acts as a heat sink, dissipating heat from the Triac that controls the heater. -
Page 3: Ratings And Current Protection
Connect the GREEN lead on the controller to ground. Ratings and Current Protection The Control Link ACC’s Triac is fused for 20A, 250V on the heater circuit, with a separate 1A fuse on the control components so that communication can continue even if the Triac’s fuse blows. -
Page 4: Mounting And Wiring The Sensors
Placing the dewpoint sensor in either of these locations may require a hole to be drilled in the case to run the wire from the sensor to the Control Link ACC. Use caution when sealing this hole with RTV sealants — the sensor element is sensitive to high concentrations of RTV. Do not let any RTV sealants touch the sensor element, and keep the sensor element as far as possible from where the hole is sealed. -
Page 5: Dewpoint Sensor Wiring
— the sensor is placed under the door just to the left of the center mullion where the Control Link ACC is installed. Do not mount the sensor inside the case mullion or anywhere outside the case. -
Page 6: Network Wiring And Configuration
Control Link ACC enclosure. Network Wiring and Configuration If each Control Link ACC will be configured with its own dewpoint sensor, it is not necessary to network the Control Link ACC together. However, when networked, multiple Control Link ACC controllers may use a single dewpoint sensor. - Page 7 E2 Setup of Control Link ACC Devices Set Up Network Ports Before setting up a Control Link ACC, the port on the E2 that has the MODBUS cable connected must be set up as a MODBUS port. 1. Log in to the E2 with Level 4 access.
- Page 8 5. Locate the CtrlLink ACC units you added to the network list (press to scroll through the list). The default name for a Control Link ACC begins with a two-letter designator of the model type (AC for anti-con- densate). If desired, enter a new name for each device in the Name field.
- Page 9 •Online - The Control Link ACC is communicating normally. •Offline - The Control Link ACC is not communicating, has not been commissioned, is not functional, or is not powered up. Ver- ify the Control Link ACC is powered up, wired correctly, and has the proper network address, baud rate, and parity (see “Troubleshooting Control Link ACCs and the ECT MODBUS Network”...
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Page 10: Wiring Types
Nominal Impedance 120Ω±50Ω Document Part # 026-4703 Rev 8 10-JUN-2009 Page 10 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. - Page 11 Set all network address dip switches or jumpers to the DOWN (OFF) position. This will allow the Control Link ACC to share a dewpoint sensor as long as the network is physically present and ter- minated correctly.
- Page 12 Figure 18 - Control Link ACC Network Baud Rate/Parity Dip Switch/Jumper NOTE: If you are networking Control Link ACC only for purposes of sharing a dewpoint sensor, you do not need to set a baud rate or parity. Set all dip switches or jumpers to the DOWN (OFF) position. This will allow the Control Link ACC to share a dewpoint sensor as long as the network is physically present and terminated cor- rectly.
- Page 13 Control Link ACCs to share a dewpoint sensor is to connect at least one dewpoint sensor to one Control Link ACC on the network. Any Control Link ACC on the network can be configured with the dewpoint sensor.
- Page 14 Figure 21 - Setpoint Jumper Location and Settings (Discontinued) 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.
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Page 15: Operation
When setting up Control Link ACCs and temperature offset jumpers, choose either a HIGH offset (4 degrees C), a MEDIUM offset (2 degrees C) or a LOW offset (0 degrees C) and set each Control Link ACC and the dewpoint sensor to the required position for the chosen offset. -
Page 16: Error Modes
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. - Page 17 Priority 4: FLASH/CLOCK FAILURE A firmware or hardware error has occurred, and the Control Link ACC is unable to function. A controller in this error state will require replacement. The STATUS LED will give one short blink, one long blink, pause, and repeat the pattern.
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Page 18: Specifications
Problem: Control Link ACC Offline 1. Check wiring - Verify the Control Link ACC is properly connected to the MODBUS cable. Verify the net- work polarity is correct (+ to +, - to -, 0V to 0V) and there are no loose wires. If none of the Control Link ACCs are online, check wiring connections on the E2.