Emerson EC2-311 User's Manual

Emerson Thermostats User's Manual - EC2-311.
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EC2-311_65081_EN_R08.doc 

Replacement for Rev.:06 

1 / 4  

PCN: 864 911   20.03.2008 

 

 

EC2-311 Display Case and Coldroom Controller 

Operating Instructions 

GB 

Note: This document contains short form instructions for experienced users. 
Use last column in List of Parameters to document your individual settings. 
More detailed information can be found in the User Manual.  

 

 

The EC2-311 is a dedicated refrigeration controller with superheat control and a 
driver for an Alco Controls Electric Control Valve EX2. In addition the EC2-311 
controls air temperature and manages defrost and fan(s). 
 

Network

1

2

3

4

5

6

7

9

8

 

 

Two ECN-Pxx pipe temperature sensors (1) and (2) measure saturated suction gas 
temperatures at the evaporator inlet and outlet and feed the signals into the 
superheat control loop. The superheat controller output modulates the opening of 
the EX2 pulse width modulated Electrical Control Valve (6) thus optimising the 
refrigerant mass flow through the evaporator. The ECN-Sxx air temperature 
sensors (3) and (4) measure air-in and air-out temperature of the evaporator and 
feed signals into the air temperature thermostat. The ECN-Fxx fin sensor (5) is 
used for defrost termination. The controller has 3 relay outputs to control the 
compressor (7), defrost heater (9) and evaporator fan (8). Please consult the 
technical data (right) for input and output ratings. 
In case of power loss, due to the positive shut-off characteristics of the EX2 
Electrical Control Valves, a liquid line solenoid valve is not needed to prevent 
flooding of the compressor.  

!   Safety instructions:  

• 

Read installation instructions thoroughly. Failure to comply can result in 
device failure, system damage or personal injury. 

• 

The product is intended for use by persons having the appropriate 
knowledge and skills.  

• 

Ensure electrical ratings per technical data are not exceeded.  

• 

Disconnect all voltages from system before installation. 

• 

Keep temperatures within nominal limits.  

• 

Comply with local electrical regulations when wiring 

Technical Data 
EC2 Series Controller 
Power supply  

24VAC ±10%; 50/60 Hz; Class II 

Power consumption 

20VA max including EX2. 

Communication LonWorks® 

Interface, FTT10, RJ45 connector 

Plug-in connector size 

Removable screw terminals 
wire size 0.14 … 1.5mm2 

Temperature 
     storage 
     operating 

 
   -20 … +65°C 
 

0 … +60°C 

Humidity 

0…80% r.h.  non condensing 

Protection class 

IP65 (front protection with gasket) 

Output relays               (3) 

SPDT contacts, AgCdO 

 Inductive 

(AC15) 

250V/2A 

 

Resistive (AC1) 250V/8A; 12A total return current 

Triac output for EX2  
Electrical Control Valve 
Coil (ASC 24V only) 

24VAC, 0.1 … 1A  

Marking 

  

 

Mounting 
The EC2-311 can be mounted in panels with a 71 x 
29 mm cutout. See dimensional drawing below for 
space requirements including rear connectors. 
Push controller into panel cutout.(1) 
Make sure that mounting lugs are flush with outside 
of controller housing 
Insert allen key into front panel holes and turn 
clockwise. Mounting lugs will turn and gradually 
move towards panel (2) 
Turn allen key until mounting lug barely touches 
panel. Then move other mounting lug to the same 
position (3) 
Tighten both sides very carefully until controller is 
secured. Do not over tighten as mounting lugs will 
break easily. 
 

 

 

Electrical Installation 
Refer to the electrical wiring diagram (below) for electrical connections. A copy of 
this diagram is labeled on the controller. Use connection wires/cables suitable for 
90°C operation (EN 60730-1) 

 

EC2 analog inputs are for dedicated sensors only and should not be connected to 
any other devices. Connecting any EC2 inputs to mains voltage will permanently 
damage the EC2. 
Important:
 Keep controller and sensor wiring well separated from mains wiring. 
Minimum recommended distance 30mm.  
Warning:
 Use a class II category transformer for 24VAC power supply 
(EN 61558). Do not ground the 24VAC lines. We recommend to use one 
transformer per EC2 controller and to use separate transformers for 3rd party 
controllers, to avoid possible interference or grounding problems in the power 
supply. Connecting any EC2 inputs to mains voltage will permanently damage the 
EC2. 

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