Adey Midi 135 User manual

Installation and servicing
Midi 135/150/235/250
Digital Pressurisation Unit

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CONTENTS Page
Checklist .......................................................................... 4
Important Facts - read before commencing installation ............................... 5
Location ........................................................................... 6
Key Features ....................................................................... 8
Installation ........................................................................ 9
Electrical Installation ............................................................... 13
Commissioning .................................................................... 17
Operation .......................................................................... 24
Maintenance ....................................................................... 26
Environment Protection ............................................................ 27
Technical Specification ............................................................. 28
Trouble Shooting ................................................................... 29
Product Log ....................................................................... 30
Guarantee ......................................................................... 33
PRODUCT DESCRIPTION
Heating and cooling system pressurisation top up unit with integral water storage tank and
electric motor driven peripheral pump, automated control system consisting of pressure
transducer and water level sensors. The tank includes an AB air gap for category 5 fluid
isolation (BS EN 1717).
APPLICATION
The ADEY® Pressurisation Unit, (APU) Midi range is designed to provide initial system fill and
intermittent water top up to compensate for intermittent losses in system pressure in heating
and cooling systems in commercial or industrial applications. These could include slight leaks,
air venting, etc. The units are not designed to deal with sudden losses of system pressure
due to major water losses over extended periods. They are also not to be used for water
boosting applications.
STORAGE
If this product is not to be installed immediately on receipt, ensure that it is stored in a dry,
frost and vibration free location in its original packaging.
WARNINGS:
zThe electrical installation must be carried out in accordance with the current
national electrical regulations.
zThe electrical installation must be installed by a qualified person.
zThe motor is not accessible in normal operating mode. The unit must only be
operated with the front cover in place.
zIn the interests of electrical safety a 30 mA residual current device (R.C.D.
not supplied) should be installed in the supply circuit. This may be part of a
consumer unit or a separate unit.
zThis appliance must be earthed via the supply cord.
zThis appliance must not be used for any other application without the written
consent of ADEY Commercial Limited.
zThis appliance can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given supervision or instruction
concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user
maintenance shall not be made by children without supervision.
zChildren should be supervised to ensure that they do not play with
the appliance.
zThis product should not be used for the supply of water to more than one
heating/cooling system at a time.
Please read installation details carefully as they are intended to ensure this product
provides long, trouble free service. Failure to install the unit in accordance with the
installation instructions will lead to invalidation of the warranty.
Read this manual carefully before commencing installation.
This manual covers the following products:
Midi 135
CP1-03-04913
Midi 150
CP1-03-04914
Midi 235
CP1-03-04915
Midi 250
CP1-03-04916
As a WEEE producer, ADEY Commercial Limited are obligated to finance the collection,
treatment & recovery of WEEE, and our compliance under these regulations is ensured
via our work with our WEEE Compliance Scheme of choice, B2B Compliance.
THIS PRODUCT COMPLIES WITH CURRENT EU PRODUCT LEGISLATION

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CHECKLIST
Note: Your product may vary slightly from the picture above.
Item Description Qty Item Description Qty
APU 1 Fill valve flow restrictor 2
Front cover 1 Rubber hose sealing washer, to
be used with item C 2
Flexible hose, G ½ 15 mm
compression 2 Cable tie 2
M6 screw 1 Instruction book 1
Wall mounting plate 1
A
E
C
B
D
H
G
F
I
1 IMPORTANT FACTS: READ BEFORE COMMENCING PUMP INSTALLATION
A Water storage capacity.
1.11 The APU Midi has a usable water volume of approximately 8 litres; the length
of time the APU takes to pressurise a system will be dependent on the pressure
differential between the cold fill and set pressures and also the
refill rate of the tank
1.12 Ensure the pumps are primed as described in the priming section before
starting, to avoid causing damage to the pump shaft seal. See Section 6.26 Hydraulic
commissioning.
B Water temperature
This unit is designed to pump cold water only which should not exceed the following
values:
1.13 The maximum allowable water temperature is 23 oC (see Technical Section).
1.14 The minimum allowable water temperature is 4 oC.
C Pipework - General
1.15 Do not drill holes or put fastenings into the APU Midi tank, this will
cause leakage.
1.16 Secure pipework: Ensure pipework to and from pump is independently
supported & clipped to prevent forces being transferred to inlet and outlet
branches of the unit. Do not secure pipework to the APU Midi, this will cause
damage and possible leakage.
1.17 Flux: Solder joints must be completed and flux residues removed prior to APU
Midi installation (flux damage will void any warranty).
1.18 Pipework design: Care should be taken in the design of pipework runs to
minimize the risk of air locks e.g. use drawn bends rather than 90obends.
1.19 DO NOT introduce solder flux to flexible hose, tank, pump or any
parts manufactured from plastic.
1.20 DO NOT allow contact with oil or cellulose based paints, paint
thinners or strippers, acid based descalents or aggressive cleaning
agents.
1.21 DO NOT bend the flexible hose beyond 90o. It must be installed as
detailed, DO NOT kink. See Installation Section 4.15.
D Plumbing installation regulations
1.22 The plumbing installation must comply with the current water and building
regulations.
1.23 The plumbing installation must be installed by a qualified person.
C
Fig. 1
IMPORTANT: With the appliance removed from its packaging check for any damage prior
to installation. If any damage is found contact ADEY Commercial Ltd within 24 hours of
receipt.
AD
Front cover removed for clarity
B
E
Electrical rating
plate & serial
number
G
F
H

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2 LOCATION - GENERAL
2.11 Location: The preferred APU Midi location is either on a solid wall
or on a smooth level floor, both of sufficient strength to support
the filled weight of the unit, close to the water source and a
suitable overflow position (see Section 10 - Technical
Specification for filled weight). The APU Midi must not be installed
in a loft space. It must also be considered that the noise and
vibration from the APU Midi may be transmitted through the
structure it is sited on. Ensure the minimum clearance
requirements are followed to allow servicing of the unit.
2.12 Access and minimum clearance requirements: For emergencies
and maintenance the APU Midi must be easily accessible and have
the minimum clearance around it as laid out in Fig. 2. Additional
access to the front of the unit will be required to operate the
keypad and view the display.
2.13 Protection: The APU Midi must be located in a dry, frost free area.
2.14 Ventilation: Ensure an adequate air flow to cool the APU Midi.
Separate the APU Midi from other appliances that generate heat.
Do not block the vent holes on the front cover or the air inlet at
the rear.
2.15 Water retention: Site the APU Midi in a location where in the
unlikely event of a water leak, any spillage is contained or
routed to avoid electrics or areas sensitive to water damage.
As part of the AB airgap (CAT 5 fluid isolation) the APU has a weir
type overflow on the right hand side, water will be discharged from
this area in the event of the failure of the inlet valve or non-return
valves.
2.16 Supply inlet pressure: The water supply inlet pressure must not
exceed 7 bar.
2.17 Ambient temperature: The APU Midi must be sited in a location where
the ambient temperature does not drop below 4 °C or exceed 40 °C.
2.18 Pipework: For optimum performance inlet and outlet pipework must be a
minimum of 15 mm pipe.
2.19 Static outlet pressure: The static outlet head must be 3 metres below pump
maximum cold fill pressure (vertically above the appliance).
2.20 Noise: A flexible hose is supplied as standard which will minimise the
transmission of noise and vibration from the APU Midi pump to the pipework
connected to the appliance outlet. However, care must be taken when
mounting the APU Midi that any noise is not amplified through loose panels or
pipework.
2.21 Flexible hose: Only use the ADEY hoses supplied with the APU Midi.
2.22 Isolating valves: Separate system isolating valves (non-restrictive) must be
fitted to allow easy service of the APU Midi. Isolating valves must be mounted
where specified to allow the system isolation and removal of the APU Midi
if needed. See Section 4.15 for installation details.
Fig. 2
300
500
300
150150

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3 KEY FEATURES
3.11 The APU Midi comprises of the following main components:-
1. Moulded tank – Main body of the APU, comprising of an integrated water
tank with warning pipe and weir overflow and mounting the brass pump
assembly, manifold and controller.
2. Pump assembly – One or two brass peripheral pump units powered by
induction motors, with integrated non return valves and venting screw.
Mounted into the moulded tank with vibration isolating rubber mounts.
3. Outlet manifold – Brass manifold with pressure transducer used to monitor
system pressure and connection to the pump(s).
4. Programmable controller – Intuitive, user set controller allowing system set up
and easy alarm connection.
5. Wall mounting plate – Robust stainless steel wall mounting plate allowing
quick, easy installation and removal if needed.
6. Moulded cover – Moulded acrylic capped ABS cover retained to the
moulded tanks with Dual LockTM fastening system for quick and easy
access.
3.12 Principle of operation: The pressurisation unit consists of a break tank and
one/two peripheral pumps. The break tank is supplied with mains water from
either the left or right through a flexible hose connected to a float valve and
includes an overflow and weir to maintain an AB air gap in the tank. The unit is
connected to the heating/chiller system via another flexible hose which can
exit the unit on either the left or right. The pumps are connected to the tank
via a rubber connector.
A pressure transducer monitors system pressure and if a reduction in system
pressure is detected, the controller runs the pumps until the system is re-
pressurised to the required pre-set level. If the unit only has a single pump
connected it will run continuously until this level is reached, if the unit is a
twin pump model the pumps run in duty standby mode (the controller will
alternate which pump starts first to even the wear on the pumps). The pumps
are fitted with non-return valves to ensure system pressure is maintained once
pressurised.
4 INSTALLATION
4.11 Fill valve flow restrictor guidelines: The side entry fill valve must be fitted
with the correct filter and flow restrictor combination (dependant on the
mains water pressure) into the G ½ threaded tail as outlined below:
Coloured insert - To be used for water pressure between 1 and 4 bar
White insert - To be used for water pressure above 4 bar
4.12 Cold mains feed connection: The connection to the cold water mains inlet is
made using the 15 mm compression flexible hose supplied. Ensure the rubber
sealing washer supplied with the hose is installed when the hose is fitted.
When tightening ensure the fill valve within the tank is not rotated. If the
valve is rotated it may not function correctly with the risk of flooding. The
hose is made water tight with a sealing washer on assembly, nip tight to
4 to 5 Nm for water tight seal. (Do not overtighten). See Fig. 6.
1Fig. 3
2
3
4
5
6
Fig. 4
Fig. 5
Fig. 6

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4.13 Wall plate fixing:
1. If installing the APU Midi on a wall ensure suitable fixings for the wall
structure are used and are suitable to support the unit when fully
filled with water (see technical section for filled weights). The holes in the
wall plate are 6 mm ( section 10) in diameter, the maximum permissible screw
head height is 3 mm.
2. All holes in the wall mounting plate must have fixings used in them as per
the image below, do not leave out fastenings as this will compromise the
integrity of the wall plate.
3. Ensure you have sufficent room around the area you are mounting the APU
Midi to allow installation, servicing and operation. See section 2.12.
4. Ensure wall plate is fixed to a flat vertical wall and the top of the plate is
horizontal.
5. Retain the APU Midi to the wall mounting plate using the single M6
retaining screw at the top of the wall plate.
6. Fit the plastic cover by pressing as indicated below with the palm of the
hand as until the Dual LockTM is heard to ‘click’.
4.14 Floor installation:
1. If installed on a floor ensure the APU Midi is located so it cannot be kicked
or knocked over.
2. Ensure the floor surface on which the APU Midi is located is flat and level.
3. If possible locate the unit against a wall for added stability.
4. If the APU Midi is located in an area that might be subjected to flooding,
mount the APU Midi on a raised plinth.
4.15 Pipework connections & guidelines:
1. Before connecting the APU Midi to the system ensure that system flushing
has been performed correctly and all foreign matter, including pipe scale,
has been removed.
Note: Foreign material from the system coming into contact with the
expansion vessel bladder could cause premature failure of the expansion
vessel.
2. Isolating valves MUST be installed on the unit inlet and outlet, before
connection to the flexible hoses to allow the unit to be isolated if required.
The isolation valve on the outlet should be of a lockshield type.
See Fig. 12.
3. A drain valve must be fitted on the outlet of the APU Midi before the
isolation valve. See Fig. 12.
4. The connection to the heating/chilling system is also made with the
supplied flexible hose and a 15 mm compression fitting. The hose is made
water tight with a sealing washer on assembly, nip tight to 4 to 5 Nm
for water tight seal. (Do not overtighten).
5. The connection to the heating/chilling system can be made to the left or
right hand side by routing the flexible hose supplied as detailed below.
Fig. 7
Fig. 8
Fig. 9 Fig. 11Fig. 10
Cable tie

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6. The flexible hose and any wiring can be retained in the desired position
using cable ties and the two metal cable retention points on the top left
and right of the APU tank. See Figs. 10 & 11.
7. The warning pipe should be connected to a suitable drain via a tundish
enabling visual warning of an overflow condition. The overflow fitting is
designed to use 19 to 23 mm diameter plastic waste pipe or connect to
G ¾ threaded pipe. Ensure there is a demountable joint in the pipe to
allow the removal of the APU Midi if needed.
8. Non-return valves, pressure reducing valves and RPZ valves MUST NOT
be installed between the APU Midi and the heating/cooling system. These
devices will prevent the pressure sensor from reading the system pressure
and will lead to incorrect operation of the unit.
9. The APU Midi should be connected to the system return header along with
the expansion vessels as specified in BS 7074. See Fig. 12.
4.16 Typical installation diagram:
4.17 Vessel sizing & location:
1. System expansion vessel sizing should comply with the BS 7074 Expansion
Vessel sizing calculation.
2. The pressurisation unit and expansion vessels should be connected to the
system at the same point, to provide a neutral pressure reading.
3. A lockshield valve and drain valve should be installed at the inlet of each
expansion vessel to allow for servicing.
5 ELECTRICAL INSTALLATION / EARTHING
5.11 Regulations: The electrical installation must be carried out in
accordance with the current national electrical regulations and
installed by a qualified person.
5.12 Safety: In the interests of electrical safety a 30 mA residual current
device (R.C.D. not supplied) should be installed in the supply circuit.
This may be part of a consumer unit or a separate unit.
5.13 Before starting work on the electrical supply ensure power supply is
isolated.
5.14 DO NOT allow the supply cord to contact hot surfaces, including the
motor shell, pump body or pipework. The cord should be safely
routed and secured by cable clips.
5.15 Adjacent pipes: Adjacent suction and delivery pipes should be fitted with
earthing clamps in accordance with current regulations (Fig. 14).
5.16 Earthing: This appliance must be earthed via the supply cord.
5.17 Pipework: Copper or metallic pipework must have supplementary earth
bonding where the continuity has been broken by flexible hoses or plastic
components.
5.18 Additional earthing: Certain installations may require additional earthing
arrangements such as equipotential bonding. Reference should be made to
the relevant regulations concerning this subject to ensure compliance.
5.19 Connections: The APU Midi must be connected to a dedicated fused SPUR via
a lockable isolator to avoid unauthorised disconnection.
5.20 The electrical connection must be made adjacent to (not behind) the APU
Midi to allow disconnection of the electrical supply should the pump module
need to be removed for service or maintenance.
Fig. 12
Fig. 13
APU Midi
Warning pipe
Drain
valve
Isolation
valves
Expansion
vessel
Return
header
Lockshield
valve
Drain valve
Earth continuity
connection
Fig. 14
Flexible
hoses Metallic
pipework

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5.21 Wiring of connection unit:
WARNING: This appliance must be earthed.
The wires in the mains lead (supply cord) are coloured in accordance with the
following code:
Green and Yellow: Earth
Blue: Neutral
Brown: Live
As the colours of the wires in the mains lead of this appliance may not
correspond with the coloured markings identifying the terminals in your
connection unit proceed as follows:
zThe wire which is coloured green and yellow must be connected to the
terminal in the connection unit which is marked with the letter E or by the
earth symbol: or coloured green or green and yellow.
zThe wire which is coloured blue must be connected to the terminal which
is marked with the letter N or coloured black.
zThe wire which is coloured brown must be connected to the terminal
which is marked with the letter L or coloured red.
5.22 Boiler interlock safety function:
The APU Midi is fitted with a volt free contact specifically assigned for boiler/
chiller shut down in the event that the APU Midi detects system pressure
above the Hi alarm pressure or below the Lo alarm pressure.
The boiler interlock contact will be open circuit below the Lo alarm pressure
and above the Hi alarm pressure.
When the system pressure is in its normal operating pressure range (above Lo
alarm pressure and below Hi alarm pressure settings) the contact is
closed circuit
Always refer to the boiler/chiller manufacturer’s instructions for correct
integration.
5.23 Alarm and boiler interlock connections:
Circuits connected to the relays are limited to 5 Amps, 230 V a.c.
maximum. The Installer MUST fit a 5 Amp fuse in the circuit to the
alarm relay to protect the APU Midi from damage.
For connection of output relays follow the steps and images below:
1) Remove the required green connector from the right hand side of the
control board.
2) Strip 6-8 mm insulation from the end of the connection wire (Max 1.5 mm2
CSA).
3) Insert wire into connector and screw down terminal screws to secure
(0.6 Nm max.).
NO
NO
NO
NO
Boiler Interlock
Common Alarm
High pressure alarm
Low pressure alarm
Fig. 15
Fig. 16
Fig. 17
Fig. 18

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4) Re-insert connector into the correct location on the control board and
route the cable to the back of the APU Midi and secure with a cable tie to
the retainer.
5.26 Supply cord replacement:
The supply cord and internal wiring within the terminal box are routed
and secured to ensure compliance with the electrical standard EN
60335-1. It is essential that prior to any disturbance of this internal
wiring, all cable routing and securing details are carefully noted to
ensure re-assembly to the same factory pattern is always maintained.
If the supply cord is to be changed or is damaged, it must be replaced
with a special cord assembly available from ADEY or one of their
approved repairers.
On disassembly note the cord retention and routing system.
Re-assemble to the same pattern. For information on cable connection
consult the wiring diagram.
Model Fuse Size (AMPS)
All models 5
5.24 RS 485 Modbus – BMS Connection:
RS 485 is available on this product for BMS connection and is enabled in the
Advanced settings menu.
5.25 Fuses: The following fuse size should be used:
The APU Midi is fitted with an internal re-settable fuse, see Section 11.
6 COMMISSIONING
6.11 Pre-commissioning checklist:
Before starting the commissioning process the following conditions must be met.
If these conditions are not adhered to, damage to the equipment, system and
property may result.
zEnsure the unit is sited in a frost free area, away from precipitation and
water sprays/jets.
zAll necessary pipe/electrical connections should have been made to a
satisfactory standard by a qualified person.
zThe temperature and pressure at the point of connection are within the
operating limits of the pressurisation unit.
zThe heating/cooling system is fitted with a safety valve and expansion
vessel sized appropriately.
6.12 In order for the pressurisation unit and heating/cooling system to function
correctly the following conditions must be met. If these conditions have not
been met, the commissioning process should not continue.
zEnsure the system connection has been made into the heating/chiller
system return header.
zEnsure non-return valves, pressure reducing valves or RPZ valves are NOT
installed between the pressurisation unit and the heating/cooling system.
zThe expansion vessel is pre-charged to the correct pressure (equal to
initial system design pressure).
6.13 Prior to commissioning fill the heating/cooling system via a filling loop if
possible. If this is not possible, the pressurisation unit can be used to fill the
system after commissioning has taken place. Depending on the size of the
system, this may take a considerable amount of time. The system fill
function of the unit will stop after 24 hours, if further filling is required,
reset this function.
zEnsure the heating/cooling system is filled and pressurised to the required
cold fill pressure, with the water at approximately ambient temperature.
zEnsure the system is dosed with a suitable corrosion inhibitor. Note the
APU Midi is not designed for dosing chemicals into the system, this must
be done via other means.
6.14 Expansion vessel setting:
zTo set or check the expansion vessel charge pressure the lock-shield
valve between the APU Midi and the vessel must be closed and the
vessel drained using the drain valve.
zA suitable gauge should be used to check the charge pressure.
zIf the charge pressure is too high it can be reduced by releasing air from
the vessel pre-charge valve or by using a pressure gauge with an integral
air release valve.
zIf the charge pressure is too low a small increase can be provided using a
car foot pump otherwise an oil free compressor or nitrogen bottle is
recommended.
zWhen the correct pressure is set the Schrader valve protective cap must
be replaced.
zCheck the integrity of the pipe-work. Ensure the lock-shield valve
between the system and the expansion vessel is open and the drain
valve is closed.
Fig. 19
Retainer
Cable tie

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6.15 Controller overview
The pressurisation unit controller is designed to be intuitive to use and allows
functions and alarms to be set by the installer/user. It also allows faults to be
monitored and logged to enable easier system fault diagnosis.
The functions are set using the 4 buttons (A, B, C & D) on the front of the
controller and with the help of on screen prompts via the back lit LCD display.
On the front of the APU a green ‘power on’ light will be displayed whilst the
unit is powered. If an alarm or error is raised the red ‘Error’ light will be
displayed.
A number of pressure set points can be set using the menus, these set points are
detailed below, 1 to 4 and in the description of the function.
Button A Scrolls up through menus or increases set values.
Button B Enters menus or selects values.
Button C Scrolls down through menus or reduces set values.
Button D Returns to previous menu
6.16 Function list & explanation
The functions are contained within an initial display and 3 menus:-
Setting menu (pass code protected) see Section 6.18.
Advanced setting menu (pass code protected) see Section 6.19.
Test menu (pass code protected) see Section 6.20.
6.17 Initial display
On start up, and during operation, if the APU has had no button inputs for
1 minute, a home screen (see Section 7.11) will be displayed with system
pressure, tank water level, any active alarm and any pump that is operating at
the time. By using buttons A & C to scroll up or down the following screens will be
displayed:-
System pressure
Active errors
System fill status
Pump activity
Pump run time
Alarm reset
6.18 Setting menu
(Pass code protected, if set)
The following functions can be set and modified:-
System pressure (2)
see Fig. 20
Sets the required system pressure. Set in 0.1 bar increments up
to the maximum set value for the pressurisation unit model - Midi 130
& 230 - 3.5 bar max; Midi 150 & 250 - 4.1 bar max.
Differential pressure (3)
see Fig. 20
Sets the pressure at which the pressurisation unit will turn
on at as the system pressure falls. Relative to the system
pressure. Set in 0.05 bar increments below the System pressure (2),
cannot be set above 0.1 bar below the System pressure (2).
Hi Alarm (1)
see Fig. 20
Sets high system pressure alarm. Set in 0.05 bar increments
above the System pressure (2). Cannot be set below System pressure
+ 00.5 bar. Alarm auto resets when system pressure is reduced below
alarm level.
Lo Alarm (4)
see Fig. 20
Sets low system pressure alarm. Set in 0.05 bar increments
below the System pressure (2) - Differential pressure (3) - 0.05 bar.
Alarm auto resets when system pressure is increased above alarm
level
System fill
Turns on system fill option. System fill option will turn off once
the System pressure (2) has been reached or a period of 24 hours has
passed since it was set to ‘on’. Lo alarm and Max runtime functions
are disabled whilst System fill is turned on. Pumps will stop if the
System pressure (2) or Hi alarm pressure (1) is reached.
Start Activity High
Alarm triggered if the APU starts more than the preset
limit in 24 Hours.
Set to minimum of 100 starts per 24 hrs. Set in increments of 100.
TIME
PRESSURE
HIGH ALARM SET VALUE (1)
LOW ALARM SET VALUE (4)
SYSTEM PRESSURE SET VALUE (2)
DIFFERENTIAL SET VALUE (3)
PUMP 'OFF'
PUMP 'ON'
SYSTEM FILL MODE NORMAL OPERATION
SYSTEM PRESSURE
Fig. 20
Fig. 21
A
B
C
D

- 20 - - 21 -
6.19 Advanced setting menu
(Pass code protected, if set)
The following functions can be set and modified:-
6.20 Test menu
(Pass code protected, if set)
The following functions can be set and modified:-
Common alarm relay allocation
Can be set to operate if one of the following alarms activate:-
Low water
Pump fail
Pump run time
Pump activity high
Sensor error
‘Common alarm relay operation Allows the relay to operate either as normally open or normally closed.
Run time limit
Sets the maximum time a pump can run before the pump run time
alarm is activated. Set in increments of 10 minutes up to 60 minutes
maximum. Disabled when the System fill option is turned on.
Passcode change Sets a 4 digit passcode, defaults to 0000 (off). Can be user set to limit
access to Setting, Advance setting and Test menus.
Pump run on delay
Sets the time the pump will continue to run after the system pressure
(2) is reached on rising pressure. Adjustable from 3 to 120 seconds,
pre-set to 10 seconds. Reducing this time will improve the accuracy
of the pressure setting on lower volume systems
Pump start delay
Sets the time delay in starting the pump after system pressure -
differential pressure (3) is reached on falling pressure. Adjustable
from 3 to 120 seconds, pre-set to 3 seconds. Increasing this time will
reduce un-wanted APU Midi operation during rapid system pressure
fluctuations (circulator pump starts)
Pump test Forces pump 1 (LH) or 2 (RH) to run for 5-10 seconds to enable
operation of the pump to be confirmed.
System fill volume
Monitors the volume of water pumped into the system since it was
last reset. Displayed in cubic metres (1m³ = 1000 litres). Can be user
reset.
Fill rate Monitors the rate at which water is flowing into the system and is
displayed as a real time flow rate (l/min).
Power interrupt log Monitors how long the electrical power has been applied to the APU.
Resets when power is removed or during a power cut. No user input.
Controller info Displays software revision and pump set up. No user input.
Alarm log Displays the last 30 alarm events. Can be user reset.
Pump run time log Displays how long each pump has run. Can be user reset
Pump activity log Displays which pump has run and how long it ran for. Can be user
reset.
6.21 Pre-set values
The APU will be delivered with the following pre-set values:-
6.22 Setting menu
6.23 Advanced setting menu
Set Pressure 2 bar
Differential 0.2 bar
Hi Alarm 2.5 bar
Lo Alarm 1.3 bar
System fill off
Run activity high 1000
Relay allocation Pump fail
Relay operation normally open
Pass code 0000 (not active)
Run time limit 10 minutes
Pump run on delay 10 seconds
Pump start delay 3 seconds

- 22 - - 23 -
6.24 Controller menu diagram 6.25 Common alarm relay set-up:
The common alarm relay, (relay 3, Fig.25) can be configured via the Advanced setting
menu to activate when one of the following alarms are displayed on the screen:
This will allow remote monitoring of an alarm to help fault find or monitor the
system condition. The Common alarm relay can also be configured via the Advanced
setting menu to be open circuit (NO) or closed circuit (NC) when the alarm is active
allowing the output signal to be changed.
6.26 Hydraulic commissioning:
zEnsure both inlet and outlet hydraulic connections are made using the
supplied rubber sealing washer and are watertight.
zTurn on water supply to APU – Check for leakage and operation of fill
valve.
zAllow the tank to fill and water level to stabilise. Adjust the float of the
fill valve to set the water level if needed.
zBleed pumps by undoing the slot
head bleed screw on the pump body
by ½ a turn until water can be seen to
flow out. Nip up, do not over
tighten.
zClose isolation valve on the outlet of
the APU.
zTurn the electrical supply ON to the
APU. The ADEY start up logo will be
displayed and then the Home screen will
be displayed.
zThe APU will run briefly and then turn off after a pre-set run on time.
Due to the small size of the isolated system the APU will signal a Hi
pressure error and the red error light will illuminate on the front of the
APU, this is normal.
zOpen the isolation valve on the outlet of the APU and the APU will
run and start to fill the system.
6.27 For further technical support: Phone the ADEY Customer Services team on
[phone]. Our staff are trained to help and advise you over the phone.
Hi pressure Pressure above the Hi pressure alarm (1)
Lo pressure Pressure below the Lo pressure alarm (4)
Low water level Low water level is seen by the sensor in the tank.
Pump fail A system pressure increase is not acheived in a 5 minute period.
Pump run time high A pump has run for longer than the set Pump run time value, 10 to 60
minutes without stopping.
Pump activity high A pump has started more than the Start Activity high value in 24 hours.
Sensor fail The sensor input is above or below the normal input range.
Power ‘on’ Home screen
Setting menu
Advanced menu
Test menu
Set system
pressure
Set differential
pressure
Set Hi alarm
Set Lo alarm
System Fill
`
Pump run on
delay
Common relay
operation
Run time limit
Enter pass
code
(If set)
Delay
Push to test
pump
Pump activity
log
Power
interrupt log
Alarm log
Start up screen
Pump run time
log
System fill
volume
System
pressure
display
Error display
System fill
status display
Pump activity
display
Pump run time
display
Alarm reset
Controller info
display
Setting menu
Advanced
menu
Test menu
17 Oct 2019
Passcode
change
Star Activity
High
Common relay
allocation
Pump start
delay
RS485
MODBUS
setting
Fig. 22
Fig. 23

- 24 - - 25 -
7 OPERATION
7.11 Normal operation:
The ‘Home’ screen will display the status of the tank water level, system
pressure and if any pump is running. Pressing the return key (D) will get back
to this screen.
A green ‘Power on’ light will be displayed on the front of the APU.
More detailed information is available by scrolling up or down to display:-
System pressure
System errors i.e. pump fail, low or high pressure or none.
System fill status on or off
Pump activity log
Last pump run
Alarm reset
Settings menu (access to more functions)
Advanced setting menu (access to more functions)
Test menu (access to more functions)
During normal operation the APU will monitor the system pressure and re-
pressurise the system if the system pressure drops below the system pressure
– differential pressure. See Fig. 20.
Example: System pressure 2 bar, differential pressure 0.5 bar, pump will start
to re-pressurise system at 1.5 bar system pressure and stop at a system
pressure of 2 bar.
During the normal filling operation of the APU Midi the pressure displayed on
the screen may be shown slightly higher than the set pressure whilst the
pump is running. As soon as the pump stops this displayed reading will settle
back to the actual system pressure.
During the normal operation of the pressurised system, the system pressure
will fluctuate due to expansion and contraction of the water as the system
temperature changes.
When setting the differential pressure and the Hi and Lo alarms please ensure
that the normal system pressure fluctuations are below the Hi pressure alarm
set pressure and above the differential pressure. If this is not done the APU
will try to compensate for the pressure change causing an over pressure
within the system or alarms being triggered.
7.12 Pump exercise function: If the pumps do not need to operate for more than
a week, both pumps will start for 3-5 seconds to avoid the pump(s) from
seizing due to inactivity.
7.13 Fault codes:
If there is a system fault, a red light will be displayed on the front of the APU.
If the fault/alarm is cleared the red light will go out.
The current fault will be displayed on the screen and logged in the alarm log
(last 10 alarms).
FULL ON 2.10 bar OFF
21
Fig. 24
Tank full
Pump 1
running Pump 2 is not
running
System pressure is
2.10 bar

- 26 - - 27 -
8 MAINTENANCE
8.11 Routine maintenance & service checks:
Every 6 & 12 months (see service log sheets below) the APU should be
inspected for:-
zDamage to the electrical supply cable.
zDamage to the inlet and outlet flexible hoses.
zLeakage from the APU or the connecting pipework.
zController log check; fault codes, pump run times, etc.
zTest unit operation
zFloat valve check
zLevel probe check
zWater condition check
zExpansion vessel pre-charge check
8.12 Wiring diagram
There are no user servicable wiring or components inside the controller
assembly. DO NOT remove the retaining screws or the membrane cover over
the display.
8.13 Spares
The APU Midi is designed and built to be a reliable and high quality product,
in the event of spares being required, please contact the ADEY Customer Services
team on [phone].
8.14 Long term isolation and restart procedure
If the system is to be shut down for an extended period of time due to
maintainance or system modifications being carried out to the system the
following steps must be taken.
1. Isolate mains inlet water from the APU Midi.
2. Isolate the APU Midi from the system and vent excess pressure to drain.
3. Run the APU to pump excess water from the tank to drain.
4. Isolate the electrical supply from the APU.
5. Remove the vent screws on the front of the pumps and allow excess
water to drain. Replace vent screws. See section 6.26.
6. Ensure the pressurisation unit cannot freeze. Damage will occur to the pumps
if this is allowed to happen.
7. Cover with plastic sheet or cardboard if work is to be conducted close to
the APU.
8.15 Restart
To ensure the APU is in good working order after a prolonged period of
maintainance the following steps should be taken.
1. Inspect the APU for signs of damage.
2. Check APU tank for debris, remove debris and clean tank if needed. Debris
may cause damage to the pumps if it is allowed to be drawn in.
3. Check pressure vessel pre charge pressures before the system pressure is
increased.
4. Open the mains water isolating valve allowing the APU tank to fill, and
ensure the fill valve is operating correctly and maintaining the correct
water level.
5. Check for signs of leakage.
6. Open the drain valve on the outlet of the APU.
7. Turn on the mains electrical power and ensure both (if fitted) pumps can
run (use test pump option if needed) and are pumping water to drain.
8. Close the drain valve and allow the APU to build pressure; the pressurisation unit
should turn off as the isolation valve to the system is closed.
9. Open the APU outlet isolation valve and monitor the APU to ensure there are
no leaks as the system pressure increases.
10. Check all the pre set values on the APU to ensure they are still suitable for
the system (after maintainance/modification)
9 ENVIRONMENT PROTECTION
Your appliance contains valuable materials which can be recovered or recycled.
At the end of the product’s useful life, please leave it at an appropriate local civic waste
collection point.
230 VAC/1PH/50Hz
SUPPLY
N
E
L
MAIN WINDING
THERMOTRIP
START WINDING
BLUE
BROWN
MOTOR 2
THERMOTRIP
BLUE
BROWN
MOTOR 1
PRESSURE TRANSDUCER
4-20mA, 0 - 10 bar
COMMON
LOW LEVEL
HIGH LEVEL
GREEN/YELLOW
GREEN/YELLOW
L E N
L E N
VOLT FREE ALARM CONTACTS - 5 AMP MAX.
RS 485 modbus
LOW PRESSURE ALARM N/O
HIGH PRESSURE ALARM N/O
BOILER INTERLOCK N/O
COMMON ALARM N/O
GREEN/YELLOW
BLUE
BROWN
RED GREEN
BLUE
C L1 L2
- +
CAPACITOR
BLACK BLUE
MAIN WINDING
START WINDING
CAPACITOR
BLACK BLUE
2
1
BROWN
BLUE
TANK
1
2
3
4
Fig. 25

- 28 - - 29 -
10 TECHNICAL SPECIFICATION
ADEY reserve the right to amend the specification without notice.
10.11 Noise: The equivalent continuous A-weighted sound pressure level at a
distance of 1 metre from the pump does not exceed 70 dB(A).
11 TROUBLE SHOOTING GUIDE
Symptoms Error Code Probable Cause Recommended Action
No power Blank screen
No power to APU
Internal re-settable
fuse tripped
Check power supply/fuse
Disconnect APU from mains power for 20 seconds & and then re-connect
Pump(s) not
starting
No power to APU Ensure the green light is on the front of the APU, check fuse.
Low water Low water in tank Depress float valve to varify water is filling tank, check water level and
supply.
System pressure =
set pressure
APU functioning correctly. Check the set system pressure.
Pump run fail Pump seized Force the pumps to run using the pump test function. Clear error.
Pump run fail System pressure set
too high
System set pressure is set higher than the pump performance capability,
reduce set pressure. Ensure you have purchased the correct APU for the
system pressure required.
Sensor error Pressure sensor fault Remove pressure from the APU outlet and verify the displayed pressure
is 0 bar. Error will be displayed if the sensor signal is outside parameters.
(Replace sensor – call ADEY Customer Services).
Pump(s) will not
stop
Sensor error
System pressure set
too high
System set pressure is set higher than the pump performance capability,
reduce set pressure. Ensure you have purchased the correct APU for the
system pressure required.
Pressure sensor fault Remove pressure from the APU outlet and verify the displayed pressure
is 0 bar. Error will be displayed if the sensor signal is outside parameters.
(Replace sensor – call ADEY Customer Services).
Low pressure alarm
triggered
Low pressure
Leak in system. Check system for leaks. Check pump activity in logs. Check for leaking
pressure relief valve.
Low pressure alarm
set too high.
Reduce Low press alarm pressure. Check system pressure range during
normal operation.
Sensor error Pressure sensor fault Remove pressure from the APU outlet and verify the displayed pressure
is 0 bar. Error will be displayed if the sensor signal is outside parameters.
(Replace sensor – call ADEY Customer Services).
High pressure
alarm triggered
High pressure System pressure
too high
Check system operation. Increase High presure alarm set pressure.
Sensor error Pressure sensor fault Remove pressure from the APU outlet and verify the displayed pressure
is 0 bar. Error will be displayed if the sensor signal is outside parameters.
(Replace sensor – call ADEY Customer Services).
Pump run time
alarm activated.
Pump running for
longer than set
time
Pump run time
alarm
Pump filling system Activate system fill option to suppress alarm for 24 hours.
Leak in system Check system for leakage. Monitor using system fill volume log, reset if
needed.
Increase pump run time limit.
Activity high alarm
activated. Pump
starting more than
set value Activity High
alarm
Pump filling system Activate system fill option to suppress alarm for 24 hours.
Leak in system Check system for leakage. Monitor using system fill volume log, reset if
needed.
Activity High alarm
number too low
Increase the Activity High alarm value.
Sensor failure error Sensor error Pressure sensor
outside specifcation
Remove pressure from the APU outlet and varify the displayed pressure
is 0 bar. Error will be displayed if the sensor signal is outside parameters.
(Replace sensor – call ADEY Customer Services).
Low water error Low water Loss of water supply
to APU
Depress float valve to verify water is filling tank and check water level and
supply.
Water level set
too low
Adjust water level by turning float, ensure upper level probe is in contact
with water when the fill valve is turned off.
Check water level prior to leaving unattended.
Water overflowing
warning pipe or
weir
Water level too high Check function of the fill valve, replace or adjust if needed.
Pump NRV leaking Isolate APU from system and mains water and replace non-return valve
and holder.
Midi 135
CP1-03-04913
Midi 150
CP1-03-04914
Midi 235
CP1-03-04915
Midi 250
CP1-03-04916
General Guarantee 2 year
Approvals CE
Features System capacity Up to 300,000 litres
Mounting Wall or floor mount
Pump control system ✓ ✓ ✓ ✓
Intelligent control interface ✓ ✓ ✓ ✓
System fill mode ✓ ✓ ✓ ✓
Dry run protection ✓ ✓ ✓ ✓
Typical Noise 60 dB(A) 60 dB(A) 62 dB(A) 62 dB(A)
Materials Break tank Polyethylene
Front cover Acrylic capped ABS
Performance Maximum Fill Pressure 3.5 bar (350 kPa) 4.1 bar (410 kPa)
Maximum flow 17 l/min 20 l/min
Maximum inlet pressure (tank fill valve) 7 bar (700 kPa)
Maximum working pressure 6 bar
Ambient air temperature Min 4 oC / Max 40 oC
Relative humidity 95 % non-condensing
Min./Max. water temperature Min 4 oC / Max 23 oC
Water tank Usable water capacity 8 litres
Inlet valve and fill rate Torbeck (side entry) 12 l/min
Fluid category CAT 5 (type AB air gap with weir)
Connections Cold water inlet and outlet 15 mm compression x 600 mm flexible hose
Overflow (compression fitting) G ¾ (19 - 23 mm diameter pipe)
Pump Number of pumps 1 2 1 2
Pump mode Duty Duty-standby Duty Duty-standby
Pump type / head / impeller Peripheral / brass / brass
Motor type Induction (thermal trip, auto reset)
Duty rating Continuous (S1)
Electrical Power supply (Vac/Ph/Hz) 230/1/50
Power consumption - P1 380 Watts 545 Watts
Current (full load) 1.7 Amps 2.4 Amps
Fuse rating 5 Amps
Power cable length 1.5 metres (pre-wired)
Alarm output Multiple
Physical Enclosure protection IPX4
Width 415 mm
Depth 270 mm
Height 504 mm
Weight (including fittings) 13.4 Kg 19.4 Kg 13.4 Kg 19.4 Kg
Weight (Filled) 23.4 Kg 29.4 Kg 23.4 Kg 29.4 Kg

- 30 - - 31 -
12 PRODUCT LOG
12.11 Customer details
Customer/company name
Site address
Date
12.12 Equipment details
System volume m3
Expansion vessel(s) fitted & pre-
charge pressure
Boiler(s) fitted
12.13 Commissioning record
Date commissioned
Company
Engineer
System set pressure
Differential pressure
Hi alarm set pressure
Lo alarm set pressure
12.14 Service Log
Service No. 1
Date
Engineer name
Company name
Tel. No
System pressure bar
Differential pressure bar
Check 6 months 12 months
Condition of wiring ü ü
Condition of hoses ü ü
Evidence of leakage ü ü
Controller fault codes ü ü
Test pump operation ü ü
Float valve operation xü
Level probe operation xü
Water condition xü
Exp. vessel pre-charge xü
Comments
Service No. 2
Date
Engineer name
Company name
Tel. No
System pressure bar
Differential pressure bar
Check 6 months 12 months
Condition of wiring ü ü
Condition of hoses ü ü
Evidence of leakage ü ü
Controller fault codes ü ü
Test pump operation ü ü
Float valve operation xü
Level probe operation xü
Water condition xü
Exp. vessel pre-charge xü
Comments
Service No. 3
Date
Engineer name
Company name
Tel. No
System pressure bar
Differential pressure bar
Check 6 months 12 months
Condition of wiring ü ü
Condition of hoses ü ü
Evidence of leakage ü ü
Controller fault codes ü ü
Test pump operation ü ü
Float valve operation xü
Level probe operation xü
Water condition xü
Exp. vessel pre-charge xü
Comments

- 32 - - 33 -
Service No. 4
Date
Engineer name
Company name
Tel. No
System pressure bar
Differential pressure bar
Check 6 months 12 months
Condition of wiring ü ü
Condition of hoses ü ü
Evidence of leakage ü ü
Controller fault codes ü ü
Test pump operation ü ü
Float valve operation xü
Level probe operation xü
Water condition xü
Exp. vessel pre-charge xü
Comments
Service No. 5
Date
Engineer name
Company name
Tel. No
System pressure bar
Differential pressure bar
Check 6 months 12 months
Condition of wiring ü ü
Condition of hoses ü ü
Evidence of leakage ü ü
Controller fault codes ü ü
Test pump operation ü ü
Float valve operation xü
Level probe operation xü
Water condition xü
Exp. vessel pre-charge xü
Comments
EC DECLARATION OF CONFORMITY
Product:
Name: ADEY Digital Pressurisation Unit – Midi
Model: Midi 135 - CP1-03-04913, Midi 150 - CP1-03-04914,
Midi 235 - CP1-03-04915, Midi 250 - CP1-03-04916
Manufacturer:
Name: ADEY Commercial Limited
Address: UK Head Office, Gloucester Road, Cheltenham, GL51 8NR, United Kingdom
Object of the declaration:
Pressurisation Unit
The object of the declaration described above is in conformity
with the relevant Union harmonisation legislation:
Machinery Directive 2006/42/EU
Electromagnetic Compatibility Directive 2014/30/EU (EMC)
Low Voltage Directive 2014/35/EU (LVD)
REACH 1907/2006
ROHS 2011/65/EU
and carries the CE mark accordingly.
The product also complies with the requirements of the WEEE Directive
2012/19/EU and carries the WEEE symbol accordingly.
Conformity to the essential requirements of the legislation(s)
have been demonstrated by using the following standards:
EMC:
EN 55014-1
EN 55014-2
EN 61000-3-2
EN 61000-3-3
Safety:
EN ISO 12100
EN 809
EN 60335-1
EN 60335-2-41
EN 62233
Technical documentation is kept at the following address: ADEY Commercial Limited,
UK Head Office, Gloucester Road, Cheltenham, GL51 8NR, United Kingdom.
This declaration of conformity is issued under the sole responsibility of the manufacturer.
SIGNED FOR AND ON BEHALF OF ADEY Commercial Limited.
Signature:
Neil Watson
Date: 21/10/2019

- 34 -

M0996 LF2-01-05001 V1
Telephone: [phone] Email: [e-mail]
www.adey.com
Produced from recycled material
A carbon neutral company
All ADEY marks are trademarks of Adey Holdings (2008) Limited. Please visit adey.com/trademarks for a list of ADEY marks
Copyright Adey Holdings (2008) Limited © 2019. All rights reserved.
20940 V1