EMERSON EXD-HP1 Economizer Controller Instruction Manual
- June 4, 2024
- Emerson
Table of Contents
- EMERSON EXD-HP1 Economizer Controller
- General information
- Features
- Selection Table – Controller
- Selection Table – Accessories
- Alarm functions – List of alarms
- Technical Data
- Input Sensors, Output Valves
- Dimension
- MOP Table & Functions
- Wiring Diagrams
- EXD-HP2-Upper board
- Communication Modbus RTU protocol details
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
EMERSON EXD-HP1 Economizer Controller
General information
EXD-HP1/2 are stand-alone universal superheat and/ or economizer controllers for heat pumps, heating units, air conditioning and precision cooling such as telecom and shelter applications.
Features
- Self-adapting superheat/economizer control in conjunction with EMERSON stepper motor driven electronic expansion Valves EXM/EXL or EXN
- Discharge hot gas temperature control by wet refrigerant vapor/vapor injection to compressor
- EXD-HP1: Controller with one EXV output
- EXD-HP2: Controller with two independent EXV outputs
- Controllers as slave with Modbus (RTU) communication capability. All data (read/write) accessible by any thirdparty controller having modbus communication (RTU)
- Upload/download key (accessory) for transmission of parameter settings among controllers with the same setting
- Low pressure switch and freeze protection function
- Manual positioning of valve(s)
- Limitation of evaporating pressure (MOP)
- Low/high superheat alarm
- Monitoring of sensors and sensor wiring and detection of sensor and wiring failures
- Integrated display (3-digits LEDs) and key board
- Electrical connection via plug-in type screw terminals (included with controller)
- OEM product: Box order quantities: 20 pieces (Multi-pack)
Selection Table – Controller
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Selection Table – Accessories
NOTE:
- Mandatory only for PT5N-…FLR, PT5 -…FLR with molded cable
- For further details of EXM/EXL, EXN and PT5(N): Please see separate Technical Information. For assistance with selection, please contact your local Emerson Sales offices.
Alarm functions – List of alarms
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Technical Data
Input Sensors, Output Valves
Dimension
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MOP Table & Functions
NOTE: EXN not permitted
WARNING: Flammable refrigerants: EXD-HP1/2 has a potential ignition
source and does not comply with ATEX requirements. Installation
only in a non-explosive environment. For flammable refrigerants only use
valves and accessories
approved for it
Wiring Diagrams
EXD-HP1 and EXD-HP2 (Base board)
EXD-HP2-Upper board
NOTE
- Base board for superheat control or Economizer control.
- Alarm relay, dry contact. Relay coil is not energized at alarm condition or power off and energized during normal operation
- Hot gas discharge sensor input is mandatory only for the economizer control function.
- A transformer shall be class 2
- Upper board only for superheat control
- Upper board does not need to be wired if circuit 2 of EXD-HP2 is disabled
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Communication Modbus RTU protocol details
The use of communication is not necessary/mandatory; however, the communication is available for connection to upper level of system controller (third party controller) in order to perform data and commands transfer as well as data logging.
Modbus Specification
- The Mode: RTU
- Modbus slave address range: 1 to 127 (parameter Adr)
- Baud rate: 9600 bps, 19200 bps (parameter br)
- Start bit: 1
- Data bits: 8
- Parity: even (default), no parity (parameter PAr)
- Stop bits: 1
- Master response timeout: 500 ms
Transmission Details
Modbus register address ranges
- Read-only data: Starting address: 0x0100 (256)
- Writable data: Starting address: 0x0200 (512)
- Configuration data: Starting address: 0x0300 (768)
Read Data transmission
Available with Modbus Function code 03 (0x03) Read Holding Registers
Request
Response
Error
- Function code not supported
- Starting Address or register count out of range
- Register count out of range
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Write Data transmission-single register
Available with Modbus Function code 06 (0x06) Write Holding Register
Request
Response
Error
- Function code not supported
- Starting address out of range
**Write Data transmission-multiple registers
**
Available with Modbus Function code 16 (0x10) Write Holding Registers
Request
N = register count
Response
Error
- Function code not supported
- Register Address invalid
- Register Value out of range
Writable variables EXD-HP1/2
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Read-only variables EXD-HP1/2
Configuration parameters EXD-HP1/2
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Configuration parameters EXD-HP1
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Configuration parameters EXD-HP2
Configuration parameters EXD-HP1/2 & Discharge Temperature Control
DISCLAIMER
- The contents of this publication are presented for informational purposes only and are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability.
- Emerson Climate Technologies GmbH and/or its affiliates (collectively “Emerson”), as applicable, reserve the right to modify the design or specifications of such products at any time without notice.
- Emerson does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson product remains solely with the purchaser or end user.
- Emerson does not assume responsibility for possible typographic errors contained in this publication.
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Read User Manual Online (PDF format)
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