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Emerson Climate Technologies

Electronic Valves & Controls

Emerson Climate Technologies

under different operating conditions such as com-

pressor start-up, start of further compressor, high head

pressure, low head pressure, high load, low load and

partial load operation.

EC3-X32 is capable for diagnostics and alarm. The

alarm can be received via relay output, via TCP/IP net-

work as well as optical LED/alarm code on ECD-002.

TXV Controller – EC3-X33

EC3-X33 is a stand-alone universal superheat con-

troller for air conditioning, refrigeration and industrial

applications such as chillers, industrial process cooling,

rooftops, heat pumps, package unit, close control, cold

room, food process and air driers. The optional ECD-

002 Display/Keypad Unit is necessary for setup but not

for operation of the controllers. ECD-002 can be con-

nected or disconnected to EC3-X33 at any time.

EC3-X33 with ECD-002

Universal Driver – EXD-U00

EXD-U Universal driver is a stepper motor driver

which uses an analogue input signal to dene the valve

opening. It enables the operation of EX4/EX5/EX6/

EX7/EX8 as:

EXD-U00

Optional ECD-002 Display/Keypad Unit

The ECD-002 is required to set parameters during

start-up. After completion of start-up of the EC3-X33, it

may be left connected or removed.

The display unit can be switched from K/bar/°C to

R/psig/°F. Indicator LEDs show the status of valve open-

ing, valve closing, demand and alarm.

Blinking: valve is closing

ON: valve is fully closed

Blinking: valve is opening

ON: valve is fully open

Parameters setting/saving

Next parameter

value (higher)

Next parameter/

value (lower)

Selecting/confirming

Prg & Sel (5 sec)

Manual reset for

blinking alarm codes

ON: alarm

OFF: no alarm

: demand

F: no demand

• Electronic expansion valve.

• Capacity control by means of hot gas bypass or

evaporating pressure regulator.

• Crankcase pressure regulator.

• Condenser pressure regulator.

• Liquid level actuator.

• Liquid injection valve.

The input signal for the driver module can be

4…20mA or 0…10V. The output pulses provide the pro-

portional opening/closing of EX4/EX5/EX6/EX7/EX8 and

consequently the control of liquid or vapor refrigerant

mass ow. The universal driver module can be connect-

ed to any controller which provides the analogue signal.

This gives system manufacturers the extreme exibility

to use any desired controller in conjunction with the

universal driver module to achieve different functionality.

For further details please refer to EXD-U technical data

sheet.

XEV22 Superheat Controller

The XEV22 Superheat Controller responds to

temperature and pressure inputs to precisely control

the position of an electronic stepper expansion valve

thereby maintaining accurate superheat control. A fast

recovery algorithm corrects for superheat changes more

rapidly than traditional systems after verifying a super-

heat alarm condition. This superheat controller improves

system efciency through its ability to maintain low,

accurate, stable superheat settings.

The device supports R-22, R-134a, R-404A, R-407,

R-507 and R-744 (CO

) refrigerants.

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