Operating instructions
EXD-TEVI Economizer Controller with
ModBus Communication Capability
Emerson Climate Technologies GmbH
www.emersonclimate.eu
1/3
Holzhauser Straße 180 I 13509 Berlin I Germany
Date: 19.08.2014
EXD-TEVI_OI_EN_R02_865908.docx
General information:
EXD-TEVI is a stand-alone controller for enhanced wet vapor injection in
heating applications for Copeland tandem Scroll compressors.
Notes: Another controller (like EC3-X33) must be used for main superheat control.
For ModBus communication, protocol and bus topology please see technical bulletin
of EXD-TEVI (www.emersonclimate.eu).
Safety instructions:
•
Read operating instructions thoroughly. Failure to comply can result in
device failure, system damage or personal injury.
•
According to EN 13313 it is intended for use by persons having the
appropriate knowledge and skill.
•
Before installation or service disconnect all voltages from system and device.
•
Do not operate system before all cable connections are completed.
•
Entire electrical connections have to comply with local regulations.
Installation:
The EXD-TEVI is designed to be mounted on a standard DIN rail.
Electrical installation:
•
Refer to the electrical wiring diagram for electrical connections.
•
Important: Keep controller and sensor wiring well separated from mains wiring.
Minimum recommended distance 30mm.
•
EXM-125 and EXL-125 coils are supplied with fix cable and JST terminal block
at cable end. Cut the wires close to terminal block. Remove the wire insulation
approximately 7mm at the end. It is recommended to protect wire ends with
ferrules.
•
Color codes for connection of EXM/EXL and pressure sensor PT5:
•
EXM/L BR: Brown; BL: Blue; OR: Orange; YE: Yellow; WH: White
•
PT5
BN: Brown; WH: White
Digital inputs DI1 and DI2
The digital inputs DI1 + DI2 are the interface between EXD-TEVI and system
controller if the Modbus communication has not been used. The digital status is
dependent to operation of system’s compressor/demand.
Operating condition
Digital input status
Compressor starts
Closed (Start)
Compressor stops
Open (Stop)
Wiring:
Warnings:
•
Use a class II category transformer for 24VAC power supply.
•
Do not ground the 24VAC lines.
•
Connecting any inputs to mains voltage will permanently damage the EXD-
TEVI.
We recommend using individual transformers for EXD-TEVI controller and any
3
rd
party controllers to avoid possible interference or grounding problems in the
power supply.
Lower Board
Upper Board
Notes:
* 86k
Ω
NTC Discharge Temperature sensors, see Copeland documentation
Alarm relay, dry contact. Relay coil is not energized during alarm condition or
power off.
Display/keypad unit (LEDs and button functions):
ON: Data display
ON: alarm
OFF: no alarm
ON: ModBus
communication
Next
parameter/
value
(higher)
Next
parameter/
value
(lower)
Selecting/
confirming
Parameters setting/saving
Blinking: valve is opening
ON: valve is fully open
Blinking: valve is closing
ON: valve is fully close
!
