Emerson EC2-311 사용자 설명서

 

EC2-311_65081_EN_R08.doc 

Replacement for Rev.:06 

2 / 4  

PCN: 864 911   20.03.2008 

 

 
Recommended Sensor Positions in Detail: 
(1) ECN-Pxx coil-in temperature sensor: Position on the first return bend of the 
evaporator.  
(2) ECN-Pxx coil-out temperature sensor: Position directly after the evaporator on 
the common suction line. 
(3) ECN-Sxx air-in temperature sensor: Position in the middle of the cabinet as 
high as possible. 
(4) ECN-Sxx air-out temperature sensor: Position asymmetric closer to the 
expansion valve as high as possible. 
(5) ECN-Fxx fin temperature sensor: Position on the evaporator, asymmetric closer 
to the expansion valve. 
Recommendations for mounting both pipe sensors: Insure proper thermal contact 
by using a metallic pipe clamp or temperature resistant plastic straps. Do not use 
standard plastic tie wraps (as used for electrical wiring) as they may become loose 
over time, which could result in faulty temperature measurements and poor 
superheat control performance. It is recommended to insulate the pipe temperature 
sensor with ARMAFLEX™ or equivalent. The recommended position of the pipe 
sensors is between 9 and 3 o’clock as shown in the picture. 

 

 
Both air temperature sensors should be mounted on spacers in the air duct so that 
there is airflow around.  
Caution: The sensor cables can be extended if necessary. The connection must be 
protected against water and dust. 
The superheat control is based on the two temperature sensors (1) and (2). The 
coil-in simulates the saturated suction temperature. Though the suggested position 
is the first return bend, alternative positions may be selected but the measured 
temperature should be checked against the pressure measured at the suction header. 
The evaporator outlet temperature sensor should be mounted on the common 
suction header of the evaporator. The superheat is calculated from the difference 
between these two sensors. 
A calibration correction can be made using the parameter u1 (see procedure 
below). 

For convenience, an infrared receiver for the optional IR remote control unit is 
build-in, enabling quick and easy modification of the system parameters when a 
computer interface is not available. 
Alternatively, the parameters can be accessed via the 4-button keypad. The 
configuration parameters are protected by a numerical password. The default 
password is “12”. To select the parameter configuration: 

• Press the PRG button for more than 5 seconds, a flashing “0” is displayed 
• Press   or   until “12” is displayed (password) 
• Press SEL to confirm password 
The first modifiable parameter code is displayed (/1). 
To modify parameters see Parameters modification below. 

• Press   or   to show the code of the parameter that has to be changed; 

• Press SEL to display the selected parameter value;  
• Press   or   to increase or decrease the value; 
• Press SEL to temporarily confirm the new value and display its code;  
• Repeat the procedure from the beginning "press   or   to show..." 
To exit and save the new settings: 

•  Press  PRG to confirm the new values and exit the parameters modification 

procedure. 

• Do not press any button for at least 60 seconds (TIME OUT). 
• Press “ESC” on IR remote control. 

A defrost cycle can be activated locally from the keypad : 
• Press the   button for more than 5 seconds, a flashing “0” is displayed 
• Press   or   until “12” is displayed (password) 
• Press SEL to confirm password 
The defrost cycle is activated 
 

The Special Functions can be activated by: 
• Press   and   together for more than 5 seconds, a flashing “0” is displayed. 
•  Press   or   until the password is displayed (default = 12). If password was 

changed, select the new password. 

•  Press  SEL to confirm password, a “0” is displayed and the Special Function 

mode is activated. 

• Press   or   to select the function. The number of special functions is dynamic 

and controller dependent. See list below. 

• Press SEL to activate the function without leaving the special function mode. 
• Press PRG to activate the function and leave the special function mode. 
Most of the Special Functions work in a toggle mode, the first call activates the 
function, and the second call deactivates the function. 
The indication of the function can only be displayed after exiting the special 
function mode. 

•  0: Display test function 
•  1: Clear alarm messages 
•  2: Cleaning mode. The cleaning mode is effectively a manual defrost with the 

option of the fans on/off. The cleaning mode should not be used in order to 
isolate the application for maintenance purposes. 

•  3: Fans only 
•  4: Set the electronic control valve to 100% open 

•  5: Resets all parameters to the factory default setting. The controller will 

indicate “oF” during the reset and the valve will close. 

The data to be shown on the display can be selected by the user. In case of an 
alarm, the alarm code is displayed alternately with the selected data. The user can 
inhibit the alarm code. Press the SEL button to scroll through all possible 
displayable data. 
The display will show for one second the numerical identifier of the data and then 
the selected data. After two minutes the display will return to the by parameter /1 
selected data. 
It is possible to temporarily display the values of the different sensors. This is a 
useful feature when initially setting-up the system without the aid of the 
WebPages. Press the SEL sequentially. The value displayed on the screen 
corresponds to the number corresponding to the /1 parameter. Action only valid 
when parameter H2 = 3 

 Logical status of compressor relay 

LON service LED 

 

Logical status of fan relay 

Logical status of defrost heater relay 

Alarm condition 

IR LED