Mikrofill 3 Guide

PRESSURISATION UNIT
MIKROFILL 3 PRESSURISATION UNIT
TECHNICAL DOCUMENTATION
ISSUE 12/15 Rev. 01
INSP I R E D EFFI C IENC Y

TABLE OF CONTENTS
TECHNICAL DOCUMENTATION 03
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Technical Data
Electrical Details
Connection Details
Installation
Mains / Boosted Cold Water Supply
Fill Pressure
Connection to the System
Drain
Dimensions
Diagram of a Typical Installation
Wall Mounting Plate Dimensions for Fixing
Electrical Connections
Electrical Diagram
Electrical Data
Keypad Functions
System Data
Up
Power
Down
Service Mode
Status Display
Pressure Correct
System Filling
Filling Stopped due to Low Mains Water Pressure
Frequent Use
Service Mode
Adjusting Settings
Parameter Functions
Fault Diagnosis
Status / Fault Conditions
Status / Fault Conditions continued.
Manual Override
Component List
Maintenance
Removing the Controls Assembly
Cleaning the Solenoid Valves
Cleaning the Inlet Ballofix Valve
Declaration of Conformity
04
05
06
07
08
09
10
10
11
12
13
14
14
15
16
17
18

TECHNICAL DATA
04 TECHNICAL DOCUMENTATION
WRAS Approval Number:
ELECTRICAL DETAILS
• Supply Voltage:
• Full Load Current:
• Start Current:
• Fuse Rating:
• Maximum Load BMS Relays:
CONNECTION DETAILS
• Cold Water Inlet:
• System Outlet:
• Drain (via Tundish):
• Maximum Inlet Pressure:
• Maximum Cold Fill Pressure:
•Nominal Flow Rate:
•Dry Weight:
1806078
230 Volt
1 Amp
1 Amp
3 Amp
5 Amp
15mm Compression
15mm Compression
¾” BSP
5 Bar
4.7 Bar
14 l/min at 2 Bar
5 kg

TECHNICAL DATA
TECHNICAL DOCUMENTATION 05
The Mikrofill 3 is a fully automatic sealed system filling device and is suitable for the water management in
domestic and commercial heating and cooling systems. It is designed for use in a normal environment. It is not
suitable for installation outside, or in environments where there are excessively cold temperatures.
INSTALLATION
All Mikrofill products should be installed by a competent person with regard to the relevant requirements of
the Health and Safety Regulations, Building Regulations, IEE Regulations, Water Supply (Water Fittings)
Regulations, Water By-laws (Scotland) and any other by-laws or planning requirements.
The Mikrofill 3 is WRAS approved with certificate number 1806078.
It is intended for wall mounting (see page 08) and should be mounted at such a height as to enable the
display to be easily read.
MAINS / BOOSTED COLD WATER SUPPLY
The Mikrofill 3 is designed to be connected directly to the mains cold water supply, or a boosted cold water
supply. The unit is supplied complete with all necessary isolating valves and incorporates a basket filter in the
inlet ballofix valve.
A flexible hose is supplied with the unit which MUST be connected to
the inlet ballofix valve, as shown in the diagram to the left. Failure to
do so may result in damage to the inlet pressure sensor due to water
hammer, resulting in a SENSOR FAILURE. Under such circumstances,
this would not be considered a warranty fault.
The water inlet connection is 15mm compression and should be
connected to the mains cold water supply by 15mm copper pipe or
equivalent approved plastic pipework.
If the Mikrofill 3 is sited some distance from the mains cold water
supply it may be advisable to install a single check valve adjacent to
the mains cold water supply.
To reduce the pressure drop on very long supply routes 22mm supply
pipework is recommended.
FILL PRESSURE
The Mikrofill 3 is capable of filling a system to within 0.3 bar of its
current inlet water pressure.
Where the incoming water pressure exceeds 5 bar please contact
our technical department on 03452 60 60 20 for further installation
information.
FLEXIBLE
HOSE

TECHNICAL DATA
06 TECHNICAL DOCUMENTATION
CONNECTION TO THE SYSTEM
The Mikrofill 3 is connected to the system by way of the 15mm outlet isolation valve. The pipework from the unit
should be made in 15mm copper or similarly approved plastic pipework. A suitable sized expansion vessel
should be incorporated into the system at this point (please refer to the typical installation diagram on page
07 for more information).
Please contact our technical department on 03452 60 60 20 if you require any assistance regarding vessel
sizing.
The final connection into the system should be sized accordingly, recommendations are shown below:
• Vessel size up to ½”
• Vessel size up to ¾”
• Vessel size up to 1”
For vessel sizes in excess of 1000L capacity please contact our technical department.
IMPORTANT NOTE:
DRAIN
Following every fill procedure the unit will discharge a small amount of water, establishing an air break. For this,
the unit is supplied fitted with a ¾” BSP tundish, which must be connected to a suitable drain.
Mikrofill Systems Ltd. cannot accept responsibility for any consequential damage caused by failure to
connect the tundish to a suitable drain.
100L:
300L:
1000L:
(15mm) expansion pipework
(22mm) expansion pipework
(28mm) expansion pipework
The expansion vessel air / nitrogen charge must be set to the same pressure as the cold fill
pressure of the system.
If the installed height of the expansion vessel is different to that of the unit then please
contact our technical department who will advise on the air / nitrogen charge required.
A suitably sized pressure relief / safety valve MUST be fitted on all sealed systems.

TECHNICAL DATA
TECHNICAL DOCUMENTATION 07
DIMENSIONS (IN MILLIMETRES)
DIAGRAM OF A TYPICAL INSTALLATION
Please note that for the purpose of clarity, system valves are not shown. For systems exceeding 90°C contact
our technical department on 03452 60 60 20 for advice.
Further installation guidelines can be found on page 05 of this technical documentation.

TECHNICAL DATA
08 TECHNICAL DOCUMENTATION
WALL MOUNTING PLATE DIMENSIONS FOR FIXING (IN MILLIMETRES)
• A maximum size of No. 8 screws or M4 bolts are to be used.
• A minimum of 25mm clearance either side of the unit is required.
• A minimum of 250mm clearance above the unit is required.
• The unit must be fitted on a sound, solid surface.
262
205
170
177

ELECTRICAL CONNECTIONS
TECHNICAL DOCUMENTATION 09
The Mikrofill 3 requires a permanent 230 V 50 Hz 1 phase fused supply rated at 3 Amp. The unit is internally fused
at 3 Amp (see electrical installation diagram below).
The unit also incorporates two BMS relays offering volt free contacts for the remote indication of low or high
pressure conditions within the system. These relays are also independently fused at 5 Amp to protect the
Mikrofill 3 from external electrical faults. Alternatively, if only a common fault signal is required by the BMS as
opposed to individual low and high alarms, a further volt free relay is included in the unit which can be used
to interlock the boiler or chiller control circuits. Should either the low or high alarm relay operate, then this third
relay will shut down the boiler or chiller and indication of any alarm situation will be shown on the display. The
relays are suitable for use on control voltages up to 250 V.
To access the wiring connections on the Mikrofill 3, the cover on the lower front of the unit will first need to be
removed by unscrewing the PZ2 screw located on the underside. Removing this cover will reveal a 12 way
terminal block, with each connection labelled 1 - 9 for the volt free relays (see electrical installation diagram
below), Live, Earth and Neutral. The wiring can be passed through the cable glands on the underside of the
unit, through an opening in the front casing, then connected as required into the terminal block.
Once the Mikrofill 3 has been correctly connected, the unit is ready for use. Ensure that the unit has a water
supply and that the service valves are open. Check for water leaks, switch on the electrical supply to the unit
and press the central power button on the front of the unit until the display illuminates. After a brief period, the
unit will start to fill the system. Once the system has achieved its set cold fill pressure, the unit will stop filling,
discharge a small amount of water to drain and then go to PRESSURE CORRECT.
ELECTRICAL DIAGRAM (WHEN NOT AT FAULT)
ELECTRICAL DATA
• Supply: 230 V 1 ph 3 Amp.
• Full Load Current: 1 Amp.
• Start Current: 1 Amp.
• Fuse Rating: 3 Amp.
• BMS Relays and Boiler / Chiller Relays: Volt Free Contacts rated at 250 VAC at 5 Amp.
• All relays are independently fused at 5 Amp.

KEYPAD FUNCTIONS
STATUS DISPLAY
10 TECHNICAL DOCUMENTATION
The top line of the display on the Mikrofill 3 will provide information on the current status of the unit as well as
the system that it is managing, providing information on any potential issues and / or faults as and when they
occur.
The following status messages will be displayed on the unit based on current conditions:
If the unit displays any messages other than those detailed above, then there is likely a fault either with the unit
or the system. For a list of possible fault displays, along with causes and remedies, please refer to pages 13 and
14 of this technical documentation.
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SYSTEM DATA
This button is used primarily to scroll through the various settings of the unit. Repeatedly pressing this
button will cycle through each setting (see page 12 for information on each of these settings).
Pressing this button whilst the unit is in SERVICE MODE will again cycle through each setting, but in
this mode the settings can now be adjusted (described in further detail on page 11).
UP
When the unit is in SERVICE MODE this button is used to increase parameter values.
POWER
Pressing and holding this button for approximately 2 seconds will turn the unit on or off. When the
unit is powered on, the display should always be illuminated.
NOTE: This button will turn the unit off, but it does not isolate power to the unit.
DOWN
When the unit is in SERVICE MODE this button is used to decrease parameter values. This button can
also be used to view the calibration code for the unit’s pressure sensors by pressing and holding it
down for 2 seconds. The top line of numbers displayed will relate to the calibration of the unit.
SERVICE MODE
This is a multi-function button that, when the unit is in operational mode, is used to mute the audible
alarm conditions. Pressing and holding this button for approximately 8 seconds will put the unit into
SERVICE MODE where various parameters can then be adjusted (described in further detail on
page 11).
PRESSURE CORRECT
The Mikrofill 3 continuously monitors the system pressure. When the system pressure is within set
parameters, the unit will show this message on the display.
SYSTEM FILLING
This message indicates that the unit is currently filling the system to its target fill pressure.
FILLING STOPPED DUE TO LOW MAINS WATER PRESSURE
The Mikrofill 3 continuously monitors the inlet pressure. If this inlet pressure falls below an acceptable
level (within 0.3 bar of the current system pressure) whilst the unit is attempting to fill the system then
the unit will operate a safety shut-down, displaying this message. Once the incoming pressure is
reinstated, the unit will return to operating as normal.
FREQUENT USE
There is a FREQUENT USE setting on the Mikrofill 3 which can be adjusted by accessing the SERVICE
MODE (described in further detail on page 11). If the unit cuts in to top up the system more than the
number of times this setting is set to within a 24-hour period then the unit will alarm and display this
message. This alert is for informational purposes as it informs that the unit is having to top up the
system unusually often, suggesting there may potentially be a leak somewhere on the system.

SERVICE MODE
TECHNICAL DOCUMENTATION 11
ADJUSTING SETTINGS
The settings on the Mikrofill 3 can be adjusted on site by following the below steps:
STEP 01:
STEP 02:
STEP 03:
STEP 04:
STEP 05:
Press and hold the button for approximately 8 seconds.
The display will indicate that you are now in SERVICE MODE. You can then release the button.
The button can now be used to scroll through the various settings.
To increase or decrease the value of a setting use the or buttons respectively.
After adjusting the settings, the unit will save any changes made and return to its normal
operating mode when no button is pressed for approximately 30 seconds.

PARAMETER FUNCTIONS
12 TECHNICAL DOCUMENTATION
The following lists each parameter of the Mikrofill 3 which can be adjusted through the SERVICE MODE, along
with an explanation of their functions:
• Cold Fill Pressure
• Alarm Low Pressure
• Alarm High Pressure
• Usage
• Lvl 1 Leak Alert Time
• Delay Off
• Frequent Use Alarm
• Delay On
• Time & Date
• Audible Alarm
• Fault Log
• Leak Alert
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the required pressure of the system when cold.
the system pressure at which the low pressure alarm relay will operate,
typically set 0.6 - 0.7 bar below the cold fill pressure.
the system pressure at which the high pressure alarm relay will operate,
typically set 0.2 - 0.3 bar below the system safety valve setting.
provides information on water usage in the system based on the amount of
water the unit has put into the system and how long it has been operating (this
is for information only and thus no setting is required).
to reset the usage, both the and buttons can be held together
for 3 seconds.
affects the flood protection facilities of the unit, if the Mikrofill 3 does not
register a pressure increase in the system whilst filling for the period set here
then it will assume that there must be a leak in the system and alarm, the
longer the Lvl 1 Leak Alert setting (which is calculated in minutes) the less
responsive the flood protection.
set at 0.00 to disable Lvl 1 Leak Alert protection.
refers to the amount of time in seconds that the unit will continue to fill the
system once the cold fill pressure has been reached, to prevent overshoot or
undershoot of the fill pressure - increasing the time prevents undershoot and
decreasing it prevents overshoot.
warns of frequent filling, which would indicate a system leak, by showing a
warning message if in any 24-hour period the unit operates in excess of this
value.
refers to the amount of time in seconds that the unit will wait before it begins
operation once the system pressure has dropped to its cut in point, increasing
the setting will reduce the units sensitivity to temporary drops in system
pressure.
alters the time and date displayed on the unit.
enables or disables the audible alarm when the unit goes to fault.
provides information of the last five registered faults (described in further detail
on pages 13 and 14), displayed as two letter codes which refer to the
following:
• MP - Low Mains Water Pressure when filling.
• FS - Low System Water Pressure (if Leak Alert is enabled).
• LP - Low System Water Pressure (if Leak Alert is disabled).
• HP - High System Water Pressure.
• DR - Leak Alert due to no increase in pressure whilst filling.
• FR - Frequent Run / Use.
enables or disables flood protection for the unit, it is highly recommended that
this setting is enabled.

FAULT DIAGNOSIS
TECHNICAL DOCUMENTATION 13
The Mikrofill 3 has a full self-diagnostic microprocessor unit which continually self-checks its operation. If an
internal fault is diagnosed then this will be displayed on the screen in place of the usual status display
(described on page 10). The message displayed will directly relate to the issue that the unit has registered and
will aid in resolving the fault.
If you continue to experience a fault, or are having difficulty in diagnosing the specific cause, then please
contact our technical department on 03452 60 60 20 for further assistance.
STATUS / FAULT CONDITIONS
continued on page 14...
CAUSE
The system pressure is not
rising due to a leak.
The unit is going to fault
when trying to fill due to low
incoming water pressure.
Low system pressure.
Low incoming water
pressure.
Blocked inlet ballofix valve
filter.
Possible persistent leak on
the system.
High system pressure.
Possible damaged sensor.
RESOLUTION
The unit has been filling the system for longer than the Level
1 Leak Alert Time set in SERVICE MODE. The system should be
checked for leaks. To reinstate the unit, power it off and
back on again.
The unit has been trying to fill the system but has been
unable to due to a lack of mains water pressure, causing
the unit to go to fault for the duration of the Level 1 Leak
Alert Time. Check the incoming mains pressure when the
unit is filling (see also “FILLING STOPPED DUE TO LOW MAINS
WATER PRESSURE”).
The system pressure has dropped below the Alarm Low
setting. Check for leaks and that the Alarm Low has not
been set incorrectly (refer to page 12). To reinstate the unit,
power it off and back on again.
The unit requires a dynamic mains pressure of 0.3 bar or
more above its cold fill setting. If the mains pressure usually
satisfies this requirement, then the cause of the mains
pressure drop should be investigated.
The filter in the included mains inlet ballofix valve should be
removed and cleaned to ensure flow into the unit is not
being restricted (see page 17 for details).
If the unit operates more than the Frequent Use set point
during a 24-hour period this message will be displayed. This
will not stop the unit from operating or trigger the BMS fault
relays but it does indicate that there may be a small leak on
the system which should be investigated. To reinstate the
unit, power it off and back on again.
The system pressure has exceeded the Alarm High setting.
Drain down and check the air charge of any expansion
vessels on the system. Confirm the diaphragm is still intact
and check that the vessel is adequately sized. Also check
the Alarm High has not been set incorrectly (refer to page
12). This fault will automatically reset when the pressure
drops back down below the Alarm High setpoint.
Power the unit off and back on, and the unit will return to
normal operation. If the unit displays a ‘#’ in the corner of
the display then this indicates that there is still a possible
fault. After 10 minutes the unit will recheck the sensors and
return to displaying “SENSOR FAILURE” if the issue still
remains.
Obtain the calibration code for the sensors (as outlined on
page 10) and then contact our technical department on
03452 60 60 20 and we will be able to confirm if this is a
genuine sensor fault.
FAULT INDICATION
“FILLING STOPPED DUE TO
LEVEL 1 LEAK ALERT - CHECK
SYSTEM FOR LEAKS!”
“FILLING STOPPED DUE TO
LEVEL 2 LEAK ALERT - CHECK
SYSTEM FOR LEAKS!”
“FILLING STOPPED DUE TO
LOW MAINS WATER
PRESSURE”
“FREQUENT USE!”
“HIGH PRESSURE FAULT -
CHECK EXPANSION VESSEL!”
“SENSOR FAILURE”

FAULT DIAGNOSIS
MANUAL OVERRIDE
14 TECHNICAL DOCUMENTATION
STATUS / FAULT CONDITIONS continued.
In the unlikely event of “SENSOR FAILURE”, the Mikrofill 3 may begin to give incorrect readings and could cause
alarm conditions. If this occurs, a MANUAL OVERRIDE can be employed which will reinstate the BMS relays in
the unit, forcing them into a healthy position and preventing the unit from locking out any equipment that the
unit has been linked to.
To put the unit into MANUAL OVERRIDE, press and hold both the and buttons simultaneously for
approximately 2 seconds.
Before operating this feature, it must be ensured that there is sufficient pressure in the system. MANUAL
OVERRIDE must not be employed if the unit has shown a potential leak condition or if there is insufficient
pressure in the system.
FAULT INDICATION
“SENSOR FAILURE” cont.
Water continuously passing
through the tundish to drain.
CAUSE
Incoming voltage instability.
Solenoid valve blocked.
Solenoid valve or double
non-return valve has failed.
RESOLUTION
The sensors use the voltage as a baseline to measure
pressure. If the incoming voltage supply to the unit is
fluctuating then this can cause the unit to go to “SENSOR
FAILURE”. If the pressure readings on the display are
fluctuating, or the voltage is unstable when measured with
a multimeter then there is likely an issue with the supply.
The unit can be powered from an alternative source or a
power suppressor can be fitted to try and stabilise the
incoming voltage to the unit.
In either case of “SENSOR FAILURE”, the Mikrofill 3 can be put
into MANUAL OVERRIDE to stop it from locking out any
equipment on-site (described in further detail below).
Over time either or both solenoid valves inside the unit can
become blocked up with limescale or debris and this can
affect their operation. The valves can be taken apart and
cleaned, which will most likely resolve the issue.
To diagnose which of the two valves is blocked, when the
unit is still passing to drain it should be powered off. If the unit
continues to pass then the normally closed solenoid valve in
the top left of the unit will require cleaning. If the unit stops
passing when powered off then the normally open solenoid
valve directly above the tundish will require cleaning.
For detailed instructions of how to access and successfully
clean either valve, please refer to pages 16 and 17 of this
technical documentation.
If cleaning the solenoid valves does not resolve the issue,
then this will mean that either the solenoid valve or double
non-return valve has failed and will require replacing.
For more information please contact the technical
department on 03452 60 60 20.

COMPONENT LIST
TECHNICAL DOCUMENTATION 15
Any components within the Mikrofill 3 that may require replacing have been listed in this section, along with
their respective part codes. If any part needs replacing which is not listed here, please contact our technical
department on 03452 60 60 20 for assistance.
“(PART CODE) PART NAME”:
01
02
03
04
05
06
07
08
09
10
(EFD000005)
(EFD000006)
(EFD000007)
(MK3000009)
(MK3000010)
(MK3000053)
(EFD000012)
(MK3000014)
(MK3000015)
(MK3000033)
¾” TUNDISH (½” FEMALE x ¾” MALE)
AIR VENT VALVE (⅜” MALE)
BALLOFIX VALVE - INLET (15mm COMPRESSION)
CHECK VALVE ( Ø 15mm )
CHECK VALVE WITH FLOW REGULATOR ( Ø 15mm )
CONTROLS ASSEMBLY WITH SENSORS
ISOLATION VALVE - OUTLET (15mm COMPRESSION)
NORMALLY CLOSED SOLENOID VALVE
NORMALLY OPEN SOLENOID VALVE
O-RING (NITRILE) (3mm I.D. x 3mm C.S.)
11
12
13
14
15
16
17
18
19
(MK3000034)
(MK3000017)
(MK3000028)
(MK3000029)
(MK3000019)
(MK3000020)
(MK3000021)
(MK3000024)
(MK3000025)
O-RING (NITRILE) (14.5mm I.D. x 3mm C.S.)
PCB (POWER)
PIPE - CAPILLARY - INLET (COPPER) ( Ø 4mm)
PIPE - CAPILLARY - OUTLET (COPPER) ( Ø 4mm)
PUSH FIT - ELBOW ( Ø 4mm FEMALE x ⅛” FEMALE )
PUSH FIT - REDUCER ( Ø 6mm MALE x Ø 4mm FEMALE )
PUSH FIT - REDUCER ( Ø 8mm MALE x Ø 4mm FEMALE )
STOP END (BRASS) (10mm COMPRESSION)
STOP END (BRASS) (15mm COMPRESSION)
16
13
10
15
17
18
14
10
15
18
08 02
19
19
09
04
04
05
04
11
11
03
07
01
06
12

MAINTENANCE
16 TECHNICAL DOCUMENTATION
REMOVING THE CONTROLS ASSEMBLY
In the unlikely event of either a sensor or PCB failure, it may be necessary to replace the controls assembly. If
this is the case then the unit must first be isolated mechanically and electrically, and then drained down by
slackening the top inlet and system valve nuts, allowing any water in the internal pipework of the unit to drain
out. Once this is done, the controls assembly may be removed by following the steps listed below.
CLEANING THE SOLENOID VALVES
Over time either or both solenoid valves inside the unit can become blocked up with limescale or debris and
this can affect their operation. The most common indication that a solenoid valve is blocked is a steady flow
of water constantly passing through the unit and out to drain.
To diagnose which of the two solenoid valves is blocked, when the unit is still passing to drain it should be
powered off completely. If the unit continues to pass then the normally closed solenoid valve in the top left of
the unit will require cleaning. If the unit stops passing when powered off then the normally open solenoid valve
directly above the tundish will require cleaning.
To clean the solenoid valve(s) and stop them passing, the unit must first be isolated and disconnected both
mechanically and electrically. The wiring cover at the bottom of the unit is held in position by a single screw
which can be removed with a PZ2 screwdriver to give access to the terminal block where the unit can then
be disconnected electrically. Once fully isolated and disconnected both mechanically and electrically, the
unit can be removed from the wall by unscrewing the slot-head bolt on the topside of the unit and lifting then
pulling the unit from its backplate.
With the unit removed from the wall, the steps detailed on the following page will explain how to access and
clean out both solenoid valves.
Unscrew the two retaining screws on either side of the front of the
controls housing until they are extended enough to be able to grip and
pull the control assembly forward and clear of the unit, ensuring not to
pull it too far as to damage the wiring still connecting the controls
assembly to the main unit.
Unclip the two push-fit connectors holding the sensors to the pipework
fittings.
This is done by depressing the orange retaining clip on the push-fit
connector inwards and then pulling the connector and sensor away
from the pipework fitting, which should be clipped into a slot in the front
casing to hold it in place.
With both sensors disconnected from the pipe fittings, the ribbon cable
should then be removed from the back of the controls assembly. Once
this is done, the controls assembly will be completely detached from the
main unit and the above steps should be reversed in order to refit or
replace the controls assembly back into the Mikrofill 3.
Care should be taken when fixing a controls assembly into the main unit
to ensure that the two retaining screws are not over-tightened as this can
damage the PCB and / or plastic casings.
STEP 01:
STEP 02:
STEP 03:

MAINTENANCE
TECHNICAL DOCUMENTATION 17
CLEANING THE INLET BALLOFIX VALVE
As part of the annual maintenance for the unit we recommend cleaning the integral basket filter in the
incoming ballofix valve to ensure it does not become blocked over time with dirt or debris from the incoming
water supply. To do this, the valve must be isolated and the cap on the left hand side of the valve should be
removed utilising a flat-head screwdriver. This will provide access to the filter which can be removed using a
pair of long nose pliers or similar tool. Once the filter is clean, the cap and filter must both be refitted and the
valve reopened.
STEPS 01 - 03
STEP 04:
STEP 05:
STEP 06:
STEP 07:
First follow STEPS 01 - 03 for REMOVING THE CONTROLS ASSEMBLY detailed on page 16.
Once the controls assembly has been removed from the unit, the
pipework fittings can be gently pushed down to unclip them from their
slot in the front casing.
Turn the unit around and there will be four recessed retaining screws, one
in each corner, which can now be unscrewed using a PZ2 screwdriver.
This will allow the casing to be opened, though care should be taken as
the front and back casing will still be connected together with wiring.
If required, the wiring can be separated using the plug and socket
connectors so that the front casing can be fully detached.
Three PZ2 screws will be holding the manifold assembly in place inside
the casing. Unscrewing these will allow the entire assembly to be slid
forward out of the casing, granting easy access to the solenoid valves.
Plug and socket connectors will allow the solenoid valves wiring to be
separated, detaching the valves and the manifold assembly from the
main unit.
Once the valve to be cleaned has been identified (see page 14 or 16 for
details) the valve head should be removed from the manifold by
unscrewing the four bolts using an 11mm spanner or socket. The valve
should then be lifted from the manifold body, ensuring the internals are
not disturbed in the process.
There is a small pilot hole in the diaphragm which aids in equalising the
pressure when the valve opens or closes. This must be cleared of any
obstruction. Depending on the valve, there may also be a small brass pin
and ferrule in the pilot hole which can safely be removed, ensuring that
the diaphragm is not damaged in doing so. The valve and manifold
base should then be given a general clean.
To reassemble the unit, STEPS 01 - 07 should be reversed.

Mikrofill Systems Ltd.
11 Merse Road
North Moons Moat
Redditch
B98 9HL
T+44 (0) 3452 60 60 20
F+44 (0) 3452 60 60 21
DECLARATION OF CONFORMITY
We Mikrofill Systems Ltd. 11 Merse Road, North Moons Moat, Redditch, B98 9HL declare that the Mikrofill 3
pressurisation unit satisfies the essential requirements of the Electromagnetic Compatibility (EMC) Directive
2004/108/EC and the Low Voltage Directive (LVD) 2006/95/EC and is manufactured in accordance with the
harmonised European standard:
BS EN 60730-1:2011
Signed by:
Steven Cherrington
Technical Director
United Kingdom, 28th August 2015

ISO 9001
Registered
Quality
Management 015

North Moons Moat, Redditch, Worcestershire B98 9HL , UK
T+44 (0)3452 60 60 20 F+44 (0)3452 60 60 21
[e-mail] www.mikrofill.com
Mikrofill SystemsLtd. 11 Merse Road,