VEXO PD-Monitor Manual

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PD-Monitor®
Pressure Differential
Monitoring Unit
PD-Monitor®
Pressure Differential
Monitoring Unit
PAGE 1
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
SET
OPERATION &
MAINTENANCE

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PD-Monitor®
Pressure Differential
Monitoring Unit
PAGE 2
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Contents -
Liability
Warranty
Copyright
General Safety Instructions
Electrical Warning Symbol
Purpose & Use of this manual
Qualifications Required (assumptions)
Appropriate Use
Supplied goods
Transportation, Storage & Unpacking
Emergency Stop / Emergency Off
Personal Protective Equipment
Exceeding Permitted Pressure and/or Temperature Levels
Safeguards
External Forces
Electrical Equipment Inspections
Maintenance & Repair
Obvious Misuse
Product Description
Schematic Layout of Various Installations
Component List
Operating Principles
Markings
Installation
Electrical Connections & Wiring Diagram
Commissioning
VEXO®iX-2 Controller
Monitoring & Parameters
Electrical Checks & Inspection
Decommissioning & Dismantling
General Access
MODBUS List
Declaration of Conformity
VEXO®Water Treatment Products
Service History
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WARNING – This equipment must only be used, maintained or serviced by trained competent
engineers. If in any doubt please do not touch this equipment. Please contact VEXO International
or your reseller for additional advice, information and guidance.

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Pressure Differential
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PAGE 3
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Liability -
All technical information, data and information contained herein are correct at the time of
publication. To the best of our knowledge this information is the sum of our current findings
and experience. We reserve the right to make technical changes subject to the future
development of the VEXO™ product referred to in this publication. Hence no rights may be
derived from technical data, descriptions and illustrations. Technical pictures, drawings and
graphs do not necessarily correspond to the actual assemblies or parts as delivered.
Drawings and pictures are not to scale and may contain symbols for simplification.
Warranty -
Active Period: Manufacturing defects for 18 months from the date of manufacture or 12
months from the date of commissioning, whichever is sooner. This warranty covers
manufacturing defects only.
Please note that removal of the identification data labels from the equipment will render the
manufacturing warranty null and void. Manufacturing defects confirmed within the active
warranty period will be corrected at no charge.
The warranty is conditional upon the following clauses:
1.1 The equipment must be commissioned by a trained, competent engineer or qualified
person, who can verify the integrity of the equipment at that time. The qualified person
must confirm in writing that the equipment is undamaged as a result of transportation and
installation and is fit to begin the warranty period.
1.2 Photographic evidence must be collected at the time of commissioning to verify the
condition of the equipment at that time.
1.3 A trained, competent engineer or qualified person must test the equipment annually.
1.4 This warranty covers the equipment against manufacturing defects. Normal wear and
tear is not covered by this agreement and should form part of a separate service
agreement.
1.5 The equipment must be stored, installed and operated in a frost-free and dry area.
Damage resulting from exposure to adverse temperatures or other adverse
environmental conditions will not be covered by this agreement.
1.6 Any and all non-warranty service visits and non-warranty inspection visits are
chargeable and are not covered by this warranty.
Any service costs are applicable if a defect or problem manifests as a direct result of the
connected system, misuse, incorrect handling, incorrect installation or incorrect
commissioning of the unit. Confirmed manufacturing defects will be addressed as per the
above. Additional remedial works due to the misuse, incorrect handling, incorrect installation
or incorrect commissioning of the unit remain chargeable.

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PAGE 4
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Copyright -
The information contained in this manual is confidential. The manual may be circulated among
authorised personnel only. It may not be distributed to third parties. All documentation is
protected by copyright. Distribution or other forms of reproduction of documents, even
extracts, exploitation or notification of the contents hereof is not permitted, unless otherwise
specified in writing by VEXO® International (UK) Ltd. Infringements are liable to prosecution
and payment of compensation. We reserve the right to exercise all intellectual property rights.
General Safety Instructions -
Disregard for, or lack of attention to, the information and measures contained in this manual
may pose a hazard to people, animals, the environment and tangible assets. Failure to observe
the safety regulations and the neglect of other safety measures may lead to the lapse of
liability for damages in the event of damage or loss.
DEFINITIONS:
Operator: Natural person or legal entity who owns and uses the product, or whom use
of the product has been entrusted to on the basis of a contractual agreement.
Principal: Legally and commercially liable client in relation to the system as a whole.
Responsible Person: The representative appointed to act by the installer or operator.
Qualified Person (QP): Any person whose professional training, experience and recent
professional activity affords them the requisite professional knowledge. This implies
that such people have knowledge derived from relevant national and internal safety
regulations.
Electrical Warning Symbol -
Danger - Electric Current
Disregarding these warnings may:
• endanger health,
• cause death, fire or other damage,
• lead to the overloading of individual components
and to damage,
• or otherwise impair the unit’s function.
Caution - Warning for mistakes and wrong basic assumptions
Consider the implications of errors and incorrect set-up
conditions carefully!
Disregarding these warnings may lead to:
• serious personal injury,
• overloading of individual components and damage,
• impair the unit’s function.

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PAGE 5
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Purpose & Use of This Manual -
The following pages list the information, specifications, measures and technical data that will
allow relevant personnel to operate the product safely and for its intended purpose.
Responsible persons or those engaged by them, performing required services relating to this
product, must study this manual to ensure a good understanding of the information
contained herein. Such services include: storage, transportation, installation, electrical
installation, commissioning and re-starting, operation, maintenance, inspection, repair and
dismantling. Where the product is to be used in plants/facilities that do not comply with
harmonised European regulations and relevant technical rules and guidelines of professional
associations for this field of application, the present document is purely for informative and
reference purposes. As this unit may be subject to unlimited inspection at all times, this
manual must be kept in the immediate vicinity of the installed unit, at least within the confines
of the operations room.
Qualifications Required, Assumptions -
All personnel must possess the relevant qualifications to carry out the required services, and
be physically and psychologically capable to do so effectively.
Operating instructions are transferred by VEXO® representatives, or others assigned by them,
during delivery negotiations, or on demand. On-site requirements include logistics, manual
handling, and the preparation of an installation location with the requisite foundation
engineering to accommodate the unit and the requisite hydraulic and electrical connections,
the electrical installation for the power source of the equipment and installation of the BMS
signal leads if required.
Appropriate Use -
This equipment is designed for use on sealed and un-sealed thermal systems (heating, chilled
and condenser water). It is designed to confirm when a filter or item of equipment is blocked
with a designated differential pressure rating and signal the fact with either an audible alarm,
strobe light and/or a BMS common alarm signal. The maximum operating water limits of this
equipment are 30Bar.
Supplied Goods -
The items delivered must be compared against the items listed on the shipping note and
inspected for conformity. Unpacking, installation and commissioning may be started only
once the product has been checked as conforming with the intended use. In particular,
exceeding the permissible operating or design parameters may lead to malfunctioning,
component damage and personal injury. The product may not be used if circumstances are
not in line with our conformity statement, or if the delivery proceeded incorrectly in any other
manner.

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Pressure Differential
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PAGE 6
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Transportation, Storage & Unpacking -
The equipment is delivered in packing units conforming to contract specifications, or
specifications required for certain transportation methods and climate zones. At a minimum,
packing units meet the requirements of VEXO®’s packaging guidelines. Important note:
Deliver the packed goods as close as possible to the envisaged set-up location and make sure
there is a vertical, solid surface to which the goods can be mounted / secured.
Emergency Stop / Emergency Off -
The required EMERGENCY - STOP facility, in line with directive 2006/42EC, is present in the
main power switch on the front panel. Refer to the VEXO® PD-Monitor™ Schematic, item 6 on
page 9 of this document.
Personal Protective Equipment (PPE) -
To prevent or minimise the risk of personal injury, PPE must be used when doing potentially
dangerous work, or other activities, if alternative safety measures cannot be taken.
Any alternative safety measures must comply with the requirements set by the main
contractor or operator of the plant room or the site in question. In the absence of alternative
safety measures, the minimum requirements for operating the product are safety goggles,
hand protection, well-fitting clothing and sturdy, closed and skid-proof footwear.
Exceeding Permitted Pressure and/or Temperature Levels -
Equipment used in combination with the VEXO® PD-Monitor™ must guarantee that the
permitted operating temperature and the permitted medium temperature (heat transfer
medium) cannot be exceeded. Excess pressure and temperature may lead to component
overload, irreparable damage to components, loss of function and, as a result, to severe
personal injury and damage to property.
These safeguards must be checked/inspected regularly. The ambient air temperature in which
the VEXO® PD-Monitor™ is to be installed should be between 5°C and 45°C.
Safeguards -
The equipment supplied is equipped with the required safety devices. To test their
effectiveness or restore the original set-up conditions, the equipment must first be taken out
of service. Taking the system out of service implies that power should be isolated, hydraulics
isolated and then vented.
NOTE: All earthing connections are to be connected to a suitable protective earth.

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PAGE 7
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
External Forces -
Avoid any additional forces (e.g.: forces caused by heat expansion, vibration or dead weights
on the flow and return lines). These can lead to damage / leakage in water-bearing pipework,
loss of stability of the appliance and potential failure of pressure bearing components.
Obvious Misuse -
• Operation at incorrect water pressures, voltage and/or frequency.
• Use in inappropriate system designs and environments.
• Use of non-permitted or inappropriate installation materials.
Electrical Equipment Inspections -
Regardless of the prescriptions of the property insurer / operator, it is recommended to
demonstrably inspect the electrical equipment of the VEXO® PD-Monitor™ together with the
heating or chilled installation at least every 12 months.
Maintenance & Repair -
These services may only be carried out when the VEXO®PD-Monitor™ is shut down. The
VEXO®PD-Monitor™ equipment must be taken out of service and guarded against
unintentional re-starting until the maintenance work is finished. When installed with a VEXO®
X-POT™, the control panel can be interconnected to a BMS or alarm system to allow for
indication that the filter is ready for change and the magnets are ready for cleaning. The
VEXO®iX-2 Controller is fitted with a combined visual illuminated flashing beacon in low light
situations for visual indication and sounder as an indication of filter blockage. The unit must
be inspected on an annual basis, and the electrical and mechanical components verified for
operation and integrity.
Task VEXO®PD-Monitor™
Visual inspection of components 6 Months - Site Engineer
Operational check of hydraulic components 12 Months - Annual Service - Qualified Person
Operational check of electrical components 12 Months - Annual Service - Qualified Person

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Monitoring Unit
PAGE 8
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Product Description -
The VEXO® PD-Monitor™ is a packaged pressure differential monitoring unit. It is a fully
assembled, factory tested, wall-mounted unit incorporating:
• 2No 4-20 milliamp pressure transducers.
• VEXO™ iX-2 12-volt Controller with RS485 MODBUS BMS connectivity - option.
• Strobe Light (Visual Warning Alarm).
• 5-Amp Relay for blocked filter and sensor fail alarm.
• MODBUS RS485 & 5-Amp Common Alarm Relay used to contact BMS System
(Normally Open)
• VEXO™ iX-2 Controller incorporates buzzer/sounder (mute button provided).
• Pre-set to 0.4Bar pressure differential.
• Working Pressure up to 30Bar.
• Working fluid temperature -40°C up to 100°C
VEXO®PD-Monitor™
VEXO®PD-Monitor™ 230V 50Hz 13.5mA 1/4” BSP 54 T3.15AL 250V 45°C
30 Bar 1.3 200 85 150 100°C -4°C
Model
Model Power Supply Transducer
Conn. IP-Rating Fuse Ref. Max. Ambient Temp
Max. Working
Pressure
Weight
(KG)
Dimensions Max.
Working
Temp.
Min.
Working
Temp.
Width
(mm)
Depth
(mm)
Height
(mm)

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Monitoring Unit
PAGE 9
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Schematic Layout of Various Installations -
Components List -
200mm 85mm
85mm
150mm

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PAGE 10
PD-Monitor®O&M Manual
Last Updated - 07/03/2022
Operating Principle -
Operating Sequence Chart -
The VEXO®PD-Monitor™ is designed to be a self-contained pressure differential monitor and
alarm signalling device. It has a dedicated up-stream pressure transducer and down-stream
pressure transducer connection to a sealed or open vented system. As system fluid passes
through the hydraulic components in the flow sequence below, if the pressure detected
upstream and down-stream is out of the pre-set parameters within the VEXO®iX-2 Controller,
the alarm settings are activated to signal a blockage within the item of plant the unit is
monitoring.
Turn the power on.
Upstream water flow passes the upstream pressure transducer.
Upstream pressure transducer sends pressure data to controller.
Upstream water enters the plant item to be monitored.
Downstream water exits the plant item to be monitored.
Downstream flow passes the downstram pressure transducer.
Downstream pressure transducer sends data to the controller.
PD-Monitor Controller corelates up- and downstream data.
If pressure is within parameter, no action is required.
If pressure falls outside of parameters, alarms are activated.
Strobe light flashes / buzzer sounds and BMS signal is sent.
Maintenance required to clear the blockage.
Turn power off.
Blockage cleared.
Turn power back on.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
FLOW DIRECTION