Document Part # 026-4600 Rev 3 23-APR-2008
Page 4 of 8
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Control Link RSC Installation Instructions
technical bulletin
CL-RSC Operation
The Display
The primary means of interaction with the CL-RSC system during pro-
gramming and operation will be the display on the front of the Control
Link module (or the remote display, if one is being used).
Figure 9
shows the display used on both the module and the remote display.
Seven-Segment Display
The four-digit seven-segment display is the primary means a technician
or operator will use for viewing temperatures and alarm codes, and pro-
gramming setpoints.
Status LEDs
The three LEDs above the seven-segment display show the status of the compressor relay, the fan relay, and whether or not
a setpoint shift is active (lit if setpoint shift is active).
Buttons
The four buttons to the right of the seven-segment display are used to program the CL-RSC, select temperatures and alarms
for viewing, and perform other functions such as alarm silencing and manual defrost.
Modes of Operation
Start-Up
Compressor operation will be suspended after power-up based on the value of the
CSUd
parameter (default 10 minutes).
After this delay, the CL-RSC resumes normal refrigeration control. To prevent nuisance alarms when the case is first started
up, no high temperature case alarms will be generated until 120 minutes after the start of the first cooling cycle.
Normal Operation (Refrigeration)
When in refrigeration mode, the CL-RSC energizes the compressor relay when the case temperature is above the setpoint,
and de-energizes it when the case temperature setpoint is satisfied. The fan relay is activated and de-activated the same way
as the compressor relay, unless the CL-RSC has been programmed to keep the fans always ON.
Alarms During Refrigeration
If the case temperature sensor value falls below the low temperature setpoint or rises above the high temperature setpoint,
the alarm relay (if defined) will energize, and the display will show the alarm code. The energized alarm relay and display
#
Function
Fail-Safe
Output Board 618-1120
RELAY 3
Defrost
N.O.
10A-N.C. or 12A N.O. @ 120-240 VAC
RELAY 4
Auxiliary
N.C.
10A-N.C. or 12A N.O. @ 120-240 VAC
RELAY 5
Fan
N.C.
1/2 hp N.O. or N.C., 120VAC
1 hp N.O. or N.C., 240VAC
RELAY 6
&
RELAY 7*
Contactor
or Solenoid
N.C.
Contactor
Solenoid
Pilot Duty
Inrush
Steady-State
Inrush
Steady-State
VA
24VAC
2.5A
0.3A
4A
2A
50
120VAC 0.5A
0.06A
0.8A
0.4A
50
240VAC 0.25A
0.03A
0.4A
0.2A
50
* Relay 7 is not used by the Control Link RSC but has the same ratings as Relay 6
Table 2 - Relay Ratings (Output Board 618-1120)
Figure 9 - CL-RSC Display
