EMERSON EXD-HP1 Economizer Controller Instruction Manual

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

1. Function code not supported
2. Starting Address or register count out of range
3. 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

1. Function code not supported
2. 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

1. 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.
2. 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.
3. 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.
4. Emerson does not assume responsibility for possible typographic errors contained in this publication.

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