EHC Comet Combi 14.4kW User manual

Comet Combination Unit



Unit 40 block 5 Third Road
Blantyre Glasgow
G72 0UP
Tel: [phone] Fax: [phone]
email: [email protected]

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28.06.2017
Contents Page
1. Introduction 4
2. Contents 4
3. Safety 5
4. Installation; Dimentions 6
5. Installation; General 7
6. Hydraulic Schematic 10
7. Installation: Plumbing 11
8. Installation; Discharge Arrangement 13
9. Electrical Connections 15
10. Connection Of External Appliances & Controls 16
11. Electrical Schematic 17
12. Commissioning 18
13. Control Panel 20
14. Operation 21
15. Servicing 22
16. Guarantee 23
17. Troubleshooting 24
18. Technical Data 25
19. Benchmark Service Record 26

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Thank you for specifying the Comet Combination Unit (hereafter reffered to as the Comet Combi) from The
Electric Heating Company.
The Comet Combi is an electrically heated direct acting self modulating boiler that is designed for domestic
heating purposes, The Comet Combi consists of an electric heating boiler and an indirect unvented hot water
cylinder with the necessary safety devices. The Comet Combi is supplied with a twin channel programmer &
room thermostat that can be installed remotely from the boiler. When the unit is setup under its own scheduled
program times it can control both heating & hot water circuits independently. The cylinder coil is powered the by
boilers internal heat exchanger responsible for the purposes of space and water heating.
This appliance is not intended for use by persons (including children with
reduced physical, sensory or mental capabilities, or lack of experience and knowledge) unless
they have been given supervision or instruction concerning use of
the appliance by the person responsible for their safety.
Children should be supervised to ensure they do not play with the appliance.
• The Electric Heating Company reserve the right to make minor changes to the specication or design when necessary.
• All boilers come with a 24 month warranty that covers all defects originating from faulty materials and workmanship in the
manufacture of the boilers.
• The warranty covers the replacement of any faulty parts and labour costs.
• The warranty will not cover any damage to the boiler from poor or incorrect installation work.
• The warranty will not cover any call out charges that have not been authorised by the Electric Heating Company Ltd.
• The warranty will not cover water leaks into the boiler. All plumbing joints must be checked.
• The warranty card must be completed and sent back to The Electric Heating Company as soon as possible for registration.
• An internal Magnetic Filter is tted to the Boiler and it must be cleaned at least annually.
• Failure to clean the Magnetic Filter may result in boiler shut-down, this will not be covered under warranty.
• Take care when handling the boiler not to cause any damage to the unit.
• The boiler must be stored in a dry place.
• Care must be taken when installing the boiler to make sure the oor area will take the boilers full weight when full.
• Minimum clearances must be adhered to.
1. Introduction
2. Contents
Optional Extras
• Comet Combi Boiler
• Monoblock Control Set Valve
• Room Thermostat
• Twin Zone Programmer
• Tundish
• Installation Manual
• Filling Loop
• EHC Shower Flow Sensor
• Backup Immersion Heater
• Solar PV Immersion Heater

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3. Safety
Please read and understand these instructions before installing the Comet Combi. Following the
installation and commissioning instructions of the Comet Combi the system should be explained to
the customer and all instructions left with them for future reference.
• The Comet Combi must be installed in accordance with the manufacturer’s instructions and all relevant regula-
tions in force at the time of installation.
• The Comet Combi’s Domestic Hot Water Cylinder is of the UNVENTED type. Its installation is subject to Build-
ing Regulation G3 (England and Wales), Technical Standards for (Scotland) or Building Regulation (Northern
Ireland). The Installation must be carried out by a competent person qualied to do so.
• The Comet combi must be installed into a sealed (pressurised) primary system. Following installation or the
primary system the unit should be ushed in accordance with BS7593 and appropriate cleaner & inhibitor added
to the system.
• The Comet Combi’s hot water cylinder is indirectly heated by the primary heat exchanger located within the
unit.
• Please note a load check should be taken into consideration when installing high output electrical appliances.
• The use of an Off-Peak tariff that provides at least three off peak electricity periods, such as Economy 10 is
recommended. Where possible the central heating and hot water should be programmed to coincide with the
Off Peak periods available. For more information on tariffs please contact the Electric Heating Company.
This appliance must be tted in accordance with the following instructions.
The Local Building Regulations
The Building Regulations
The Building Standards, (Scotland-consolidated) Regulations. Local water bylaws. British Standards-
code of practice

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4. Installation: Dimensions
581
90168
1745
1773
~1330
150mm
Side
25mm
Side
120 60145
628
470
62
400mm Min
Front
25mm
Rear
250mm Min
Top
Note:
Please take care to leave
enough space at the front
of the boiler for routine
maintenance!
• Remove the boiler packaging checking the contents are correct.
• Take care when lifting the boiler not to cause damage to the outer casing.
• Due to the weight of the product the use of a handling device will be required.
• The boiler should be handled by two persons.
• Lift the boiler by the internal frame only, do not lift by pipes.
• Stooping should be avoided and protective clothing worn.
• Packaging is recyclable and should be disposed of approporately.

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5. Installation: General
1. General
The boiler must be installed by a professional plumber or heat-
ing engineer and must be connected to the public low voltage
network by a competent person. For systems that require a three
phase electrical supply we strongly recommend this is installed
by a 17th Edition certied Electrician.
The Electric Heating Company will not be held responsible for
faulty installations which are performed by unqualied trades-
people.
2. Pipe Connections
All Comet Combi Electric Boilers have 22mm Compression pipe
connections that are clearly marked. Please note that the boilers
are supplied with blank plugs for transit purposes that must be
removed before tting.
Mains Inlet, Hot Outlet, Flow & Return connections are clearly
marked on the external case, under no circumstances should
these connections be reversed.
If hot capillary joints are to be used, these joints must be made
before connections to the boiler are done.
3. Case Removal
Loosen the outer screw at the bottom of the boiler and pull the
front cover up & outwards taking care to remove internal earth
connections. Earth connections must be re-connected before the
boiler case is re-installed.
4. Isolation Valves
We recommend that full bore isolation valves are tted on the
Flow,Return & Main Water Supply Pipework. Such valves must
be full bore and not “ball valves”. The installation of ball valves
in the ow and return pipework will reduce the recommended
ow rate through the boiler.
5. Auto air vents
An auto air vent is integral within the boiler.
6. Boiler sizing
Calculate the space heating requirements in accordance with
BS EN 12831 and BS EN 1433. An additional allowance of 3kW
(10,239 Btu’s) should be made to the ‘space heating’ calculation.
7. Insulation
Where practical, and if at all possible, we recommend that all
pipework be insulated, in particular the primary pipework within
a boiler cupboard. This is to reduce heat loss and reduce high
cupboard temperatures from exposed pipework.
8. System Design
The boiler has an integral automatic bypass valve which should be
set to allow the minimum ow rates to pass through the boiler (8
l/min) when all radiator thermostats and zone valves are closed.
Allowance should be made for a radiator to be installed within the
heating circuit and locked open. This will be located in the room
that has the room thermostat installed. To comply with building
regulations, Part L and Part J (in Scotland), room and cylinder
stats must be tted.
9. Water Connections
Provisions must be made for the replacement of water lost from
the heating system (sealed systems). Reference should be made
to BS EN 14336 for the method of lling and make up of water.
There must be no direct connection between the boilers central
heating system and the main water supply. When mains water
is required to ll the system directly, all local water bylaws must
be observed, and any connection made must be disconnected
after use.
10. Flushing
The system must be ushed to within 10% of mains water PPM
to ensure that no debris is trapped in the system as this may
result in boiler failure. Where existing radiators and pipe-work
are utilized a power ush must be carried out to remove debris.
For further guidance please see section - Flushing & System
Protection.
11. System pressures
All boilers are tested to 4.0 bar. The normal working pressure of
the boiler should be set to approx 1.0 / 1.5 bar. All sealed sys-
tems should comply with the relevant building regulation sand
standards, including BS EN 13831 – Specication for Expansion
Vessels.
Please note:
In order to protect the boiler, it is imperative that the pre-installed
magnetic lter is removed and cleaned at least annually. Failure
to carry out this action will increase contamination of the boiler
by system residue.
12. System types
The Comet Combi range of boilers can be used in various system
designs. Please refer to The Electric Heating Company for more
details on our Comet Combi Boiler for under oor heating.
We recommend the use of thermostatic radiator valves on all
radiators except in the room that has the wall thermostat tted.
This radiator should be tted with lock shield valves and left in
the fully open position.
Systems should be designed to meet the current building regula-
tions in force at the current time.

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5. Installation; General
1 2
The following steps will assist in removing the casing for installation & maintenance purposes.
Loosen Bottom Screw. Lift & Pull Cover Out At The Bottom To Remove.
3
4
Remove Left Screw.
Remove Right Screw.
5
Carefully Lift & Remove Top Section.

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5. Installation; General
1
6
9
2
3
10
5
8
4
7
1 - Expansionvessel
2 - Tundish
3 - MagneticFilter
4 - VortexFlowSensor
5 - PressureSensor
6 - PowerBoard
7 - Pump
8 - HeatExchangerincludingAAV
9 - Zonevalves
10- Drainvalve

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Mains water inlet hot water outlet
Primary return
balanced mains outlet
Primary flow
1
13
12
11
10
9
8
6
2
3
7
4
5
14
14
Valve Not Included Valve Not Included
1 - CombinationValvewithPRV
2 - Expansionvessel
3 - T&PReliefvalve
4 - Automaticbypass
5 - Tundish
6 - MagneticFilter
7 - VortexFlowSensor
8 - PressureSensor
9 - PowerBoard
10- Pump
11 - HeatExchangerincludingAAV
12- Zonevalves
13- Isolatingvalves(Notincluded)
14- DrainValve
6. Hydraulic schematic

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7. Installation: Plumbing
Water supply requirements
The Comet Combi operates at 3 bar (controlled by the inlet set) and is capable of delivering over 50 litres per minute. The high quality
inlet control set has been designed to make the most of the ow rates available, however the performance of the system is only as
good as the mains water supply to the unit. The maximum possible water demand should be assessed by taking into consideration
that both hot and cold services are supplied simultaneously from the mains. The water supply should be checked to ensure it can meet
these requirements. If necessary consult the local water company regarding the likely pressure and ow rate availability.
If measuring the water pressure, please note that a high static (no ow) mains pressure is no guarantee of a high ow rate.
In a domestic installation 1.5 bar and 25 l/m should be regarded as the minimum. The maximum recommended mains pressure for
the inlet control set is 16 bar. Consideration should be given to upgrading existing ½” (15mm) cold mains pipework to a larger size if
the recommended minimum pressure / owrate is not being achieved.
Cold mains pipework
1. Run the cold water mains pipework to the location of the Comet Combi. Take care not to run cold pipes close to hot pipework as
this will cause thermal transfer.
2. Install an isolating valve (not supplied) before the combination valve. A 22mm BS1010 stopcock can typically be used, however a
22mm 1/4 turn full bore valve is preferable as it is less likely to restrict the ow. Do not use“screwdriver slot” or similar valves.
3. Allow space for a 22mm x 22mm x 15mm tee between the combination valve and the boiler heating return connection for the
system lling loop. This must be disconnected after the system has been commissioned.
Balanced
Mains Outlet
Hot
Water
Return
Inlet c.h.
Flow outlet
c.h.
Cold Mains
Inlet

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7. Installation: Plumbing
Balanced cold connection
Do not use monobloc mixer taps or showers if the balanced cold connection is not used. Outlets of this
type can back-pressurise the unit and result in discharge.
A 22mm balanced cold mains outlet can be found on the control set supplied, (see diagram below)
Use the balanced cold mains outlet from the inlet control set (as shown in the illustration) to feed all mixer taps /
showers, instead of connecting them direct to the cold main supply. If this is not possible then a pressure reducing
valve can be installed immediately after the incoming cold mains stopcock (typically under the kitchen sink). All
outlets in the house will be set to 3 bar and thus automatically balancing the system. The expansion relief valve
section must still be mounted just above the boiler (see diagram below).
Hot Water Pipework
Ensure the rst part of the hot water pipework is run in 22mm pipe. This can be reduced to 15mm depending on the
type of taps outlets used etc. Your aim should be to reduce the volume of the hot draw off pipework to a practical
minimum so that the time taken for the hot water is as quick as possible to the point of use.
Hard Water Areas
If the unit is installed in a hard water area that exceeds 200mg/L a water softener must be used. This device will
be connected to the mains water supply within the property and must be of the type that can be connected to un-
vented hot water systems.
Cold Mains
Inlet Balanced
Mains Outlet

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trapped gulley
xed
grating
Discharge below
xed grating
metal discharge pipe (D2) from
tundish, with continuous fall.
300mm
minimum
600mm maximum
safety device
temperature
relief valve
metal discharge pipe (D1) from
temperature relief valve to tundish
tundish
Note: The discharge will consist of scalding water and steam. Asphalt, roong felt and nonmetallic rainwater
goods may be damaged by such discharges.
Note: It is not acceptable to discharge straight into a soil pipe. Position the inlet control group so that the discharge
from both the two safety valves can be joined together via a 15mm end feed Tee. Connect the Tundish and route
the discharge pipe.
The discharge pipework must be routed in accordance with Part G3 of schedule 1 of the Building Regulations.
The information that follows is not exhaustive and if you are in doubt you should seek advice.
The two safety valves will only discharge water under fault conditions. When operating normally water will not be
discharged. The tundish should be vertical, located in the same space as the unvented hot water storage system
and be tted as close as possible and within 600mm of the safety device e.g. the temperature relief valve. The
discharge pipe (D2) from the tundish should terminate in a safe place where there is no risk to persons in the vicin-
ity of the discharge, be of metal and:
A) Be at least one pipe size larger than the nominal outlet size of the safety device unless its total equivalent hy-
draulic resistance exceeds that of a straight pipe 9m long i.e. discharge pipes between 9m and 18m equivalent
resistance length should be at least two sizes larger than the the nominal outlet size of the safety device, between
18 and 27m at least 3 sizes larger, and so on. Bends must be taken into account in calculating the ow resist-
ance. Refer to diagram 1, Table 1 and the worked example. An alternative approach for sizing discharge pipes
would be to follow BS6700 Specication for design installation, testing and maintenance of services supplying
water for domestic use within buildings and their curtilages.
B) Have a vertical section of pipe at least 300mm long, below the tundish before any elbows or bends in the pipe-
work.
C) Be installed with a continuous fall.
D) It is preferable for the discharge to be visible at both the tundish and the nal point of discharge but where this
is not possible or practically difcult there should be clear visibility at one or other of these locations. Examples
of acceptable discharge arrangements are:
Theabovediagramisofatypicaldischargepipearrangement. (extract from Building Regulation G3)
8. Installation: discharge arrangement

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8. Installation: discharge arrangement
1. Ideally below the xed grating and above the water seal in a trapped gulley.
2. Downward discharges at a low level; i.e. up to 100mm above external surfaces such as car parks, hard standings, grassed areas
etc. are acceptable providing that where children play or otherwise come into contact with discharges, a wire cage or similar guard
is positioned to prevent contact whilst maintaining visibility.
3. Discharges at a high level; e.g. in to metal hopper and metal down pipe with the end of the discharge pipe clearly visible (tundish
visible or not) or onto a roof capable of withstanding high temperature discharges of water and 3m from any plastic guttering sys-
tems that would collect such discharges (tundish available).
4. Where a single pipe serves a number of discharges, such as in blocks of ats, the number served should be limited to not more than
6 systems so that any installation can be traced reasonably easily. The single common discharge pipe should be at least one pipe
size larger than the largest individual discharge pipe to be connected. If unvented hot water storage systems are installed where
discharges from safety devices may not be apparent i.e. in dwellings occupied by blind, inrm or disabled people, consideration
should be given to the installation of an electronically operated device to warn when discharge takes place.
Worked example
The example below is for G1/2 temperature relief valve with a discharge pipe (D2) having four elbows and length of 7m from the
tundish to the point of discharge.
From Table 1:
Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a G1/2 temperature relief valve is: 9.0m
Subtract the resistance for 4 x 22mm elbows at 0.8m each = 3.2m
Therefore the maximum permitted length equates to: 5.8m
5.8m is less than the actual length of 7m therefore calculate the next largest size. Maximum resistance allowed for a straight length
of 28mm pipe (D2) from a G1/2 temperature relief valve equates to: 14m
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Table 1
Sizing of copper discharge pipe ‘D2’ for a temperature relief valve with a G1/2 outlet size (as supplied).
Size of discharge pipework Maximum length of straight pipe
(no bends or elbows)
Deduct the gure below from the
maximum length for each bend or elbow
in the discharge pipe
22mm Up to 9m 0.8m
28mm Up to 18m 1m
35mm Up to 27m 1.4m
Note:
• The tundish must be installed in such away that it is visible to the occupants,and positioned away from any electrical controls
or connections.
• Cylinder Relief valve connections should not be used for any other purpose than intended.
• No valve should be tted between the expansion relief valve and the storage cylinder.

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9. Electrical Connection
ALL WIRING MUST BE CARRIED OUT IN ACCORDANCE
WITH CURRENT IEE BS7671 WIRING REGULATIONS.
ALL ELECTRICAL CONNECTIONS MUST BE MADE BY A
QUALIFIED ELECTRICIAN.
Load check must be taken into consideration when installing high
power boilers. This will be carried out by a qualied electrician.
There may be an additional requirement to upgrade the incoming
main fuse supplying the property if other high power devices are
used within the property. E.g
Electric Showers. If an electric shower is present we recommend
that a Shower Sensor is installed within the system. This will
cause an interrupt to the boilers control signal when the shower
is in use. It will disable the boiler protecting the electrical system
from overload.
All boilers must be protected at the meter position with a 30mA
double pole RCD with a minimum of 3mm contact separation
accompanied by a suitably rated MCB. If the boiler is not tted
local to the meter position then an additional isolation switch must
be tted local to the boiler for each supply.
If the property is prone to lightening strikes or power cuts it is
recommended to install a suitable surge protection device to the
boiler supply. This will reduce the risk of damage to the boiler
electronics during these events.
THIS APPLIANCE MUST BE EARTHED.
All pipe-work must be earthed in accordance with the IEE BS7671
Wiring Regulations.
After completion of all electrical works, an electrical safety check
should be carried out i.e. short circuit, earth continuity, resistance
to earth and polarity check, and all relevant Test Certicates
completed and issued to the customer.
Never open the front cover of the boiler until all power supplies
to the boiler have been disconnected.
ELECTRICAL CONNECTIONS
The electrical supply cables can be routed in to the boiler from
the top left hand side of the unit. Cable grommets are supplied
and tted to the boiler's cable entry point.
All cables should be secured to meet current regulations. The
boiler connections are clearly marked inside the boiler
L- Live, N - Neutral, E - Earth.
The supply is a permanent Feed connection to the boiler from
the mains supply and should never be isolated unless for main-
tenance purposes.
The Boiler circuit RCD should be independent of all other do-
mestic circuits. The boiler supply cable should be calculated by
the means of a cable calculation in accordance with BS7671 by
a suitably qualied electrician.
N
L
Boiler Protection
The recommended protection for hard wired boilers are as fol-
lows:
Model No Boiler size Protection (per phase)
Comet Combi 14.4kW 14.4kW BOILER 80 AMP Protection
Comet Combi 12kW 12kW BOILER 63 AMP Protection
Comet Combi 9kW 9kW BOILER 50 AMP Protection
EXTERNAL CONTROLS.
We recommend using EHC controls that are supplied with the
boiler. The boiler come with a twin zone programmer and room
thermostat.
The use of EHC controls ensures that boiler interlock is provided
as the use of TRV’s alone will not provide boiler interlock.
We recommend the use of TRV’s, however they must not be
used in the room that has the room thermostat tted.
BACK UP IMMERSION HEATER
The Comet Combi has a connection that allows you to install a
back up immersion heater if required. It is recommended that
this is connected via a local 16A double pole isolation switch
and connected to the consumer unit using the correct size cable
& 16A MCB

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10. Connection of external appliances & Controls
FACTORY CONNECTIONS
ZoneValve (RP 1 & 2 Volt Free Inputs)
When the Volt Free contacts are open circuit the boiler will automati-
cally stop heating the system.
These connections are factory tted, under NO circumstances
should any voltage be connected to these terminals as this will
result in damage to the boilers control electronics.
Master Appliance Control (NA)
The NA Connection is used when you have another high current
device installed within the property. i.e. Electric Shower or Water
Heater.
The shower sensor would be connected to the Main Water supply
feeding the shower, the switch wires from the ow sensor will then
be connected to the NA connections shown in Fig:1.
When the shower is in use the ow sensor will create an open circuit
on the NA connections. This will switch the boiler OFF when the
shower is in use protecting the power supply within the property.
External Control Connections
The Comet Combi control system is internally wired and protected
with a 1 amp fuse.
The Comet Combi is supplied with a Twin Zone programmer and
wall thermostat. The programmer and room thermostat must be
connected to the terminal connections as shown in Fig:1.
The EHC Twin Zone programmer and room thermostat that are
supplied must be connected to the internal terminal block.
This must be carried out by a fully qualied electrician.
RP1RP2 NA Thw
NA (NC)
Fig:1
1
2
3
4
5
6
7
8
9
10
11
12
XP
RM Stat
2CH. PROGRAMMER
CH
HW
N
L
Fig:2
2
1
4
3

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11. Electrical Schematic
1A 1B
ZG
U V W
1 2 3
WT3
ZM
NL
PUMP
NL
Power
Pres.ToutTinQ
NA RP1 RP2
PELN
M1
PSK
Q
BC
1A 1B 1A 1B
G1 L1 G2 L2 G3 L3
NL
N
PSK
K2K1
HW
RELAY
POWER SUPPLY
Unit
Tin
Tout
Pres
orange
grey
brown
RP2CH. PROGRAMMER
L N
PE
1 2 3
XF
CHHWNL
PE
BC - back cover
UC
UC - upper cover
LC
LC - left cover
OP
FC
RC - right cover
FC - front cover
UB1
UB1 - upper board
UB2
UB2 - upper bracket
1
2
3
4
5
6
7
8
9
10
11
12
XP
Thw
Thw
grey orange
blue
brown
yellow
green
brown
white
yellow-green
F1
1A
yellow
green
brown
white
HW CH
NZ1 NZ2 WT
MM
PE PE
 BC -backcover
 UC -uppercover
 LC -leftcover
 RC -rightcover
 FC -frontcover
 UB1 -upperboard
 UB2 -upperbracket
Room Stat
1
2
4
3

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12. Commissioning
IMPORTANT:
TURN ON THE ELECTRICAL POWER SUPPLY TO THE BOILER. MAKE SURE THAT THE PROGRAMMER IS NOT CALLING
FOR HEAT AT THIS STAGE!
FILLING THE HOT WATER CIRCUT.
1. Check the pressure in the potable vessel is set to 3 Bar
2. Check that all plumbing connections are tight
3. Open the furthest away tap outlet
Note: Make sure that the lling loop is closed at this stage!
5. Turn on the mains water supply to the unit
6. It will take a few minutes to ll the cylinder, once the water comes through the tap outlet let it run
7. Open the other hot water outlets and purge all air out of the system
8. Once fully purged close all the outlets and further check for leaks
FILLING THE PRIMARY HEATING CIRCUT.
THE PRIMARY CIRCUT MUST BE FLUSHED IN ACCORDANCE TO BS 7593
1. Connect the primary lling loop and tighten.
2. Make sure that all primary connections are tight before lling.
3. Open the lling loop and allow the system to start lling.
4. Press the right arrow key on the boiler control panel until the A (bar) led is illuminated.
5. Fill the system to 2 bar, then start to purge the radiators until all the air is out the system.
6. This will have to be repeated several times to fully purge the system re-lling as you go.
System protection:
Failure to protect the system will invalidate the manufacturer’s warranty.
1. Fill the system with cold mains water to the recommended pressure 1.5 bar and check for leaks, then drain the system thoroughly
making sure all drain cocks are fully open and that the system is completely drained.
2. Add Fernox F3 cleaner to the system at the furthest point from the boiler, this is to allow the substance to fully dilute throughout
the system. If you are unsure of the correct dose rate, contact Fernox on 03301007750 for advice.
3. Re-ll the system and circulate the F3 cleaner prior to the boiler being red up. Commission the system in the normal way. The
cleansing agent must be in the system for a minimum 1 hour with the system running at normal operating temperature. A longer
period of time would be more benecial to the cleansing process especially if excess ux was used or is an old system. F3 cleaner
can be left in the system for up to a maximum of one week running on a normal heating cycle. (We recommend that existing sys-
tems are power ushed as per BS 7593 and PAS33 regulations)
4. Drain and ush the system thoroughly to remove the cleaning agent and any debris or contaminants. This is a critical part of the
cleaning process and must be carried out correctly. Use a rinse test meter (TDS), such as the Fernox CTM. The reading must be
within 10% of the mains ppm value.
5. After the system has been thoroughly ushed and TDS readings are within 10% you can now add Fernox F1. This will protect
against the formation of scale, corrosion and microbiological growths. It is crucial however, that for the protector to work correctly,
the system must be properly cleansed and ushed.
6. Now attach the label included within the Fernox F1 packaging completed and attached adjacent to the boiler. We recommend
inhibitor levels are checked on an annual basis (usually during the service) or sooner if the system content is lost. This should be
carried out using a Fernox inhibitor Test Kit. Fernox Technical Service Helpline on 0870 870 0362 for further assistance.
We recommend inhibitor levels are checked on an annual basis (usually during the service) or sooner if the system content is lost.
This should be carried out using a Fernox inhibitor Test Kit. Fernox Technical Service Help line on 0870 870 0362 for further assistance.

19
28.06.2017
12. Commissioning
LED
1 2 3 4 5
LED
IF SUPPLIED WITH THE GRUNDFOS UPM3 PUMP
1. Ensure the system is lled with water and correctly vented.
2. Check if the appropriate system installation pressure is
reached (see the “TECHNICAL DATA” section) by pressing the
down arrow button whilst the control panel is off, the pressure
value will be displayed. When the installation pressure is too
low The “A’’indicator ickers (see “Operating’’ section). This
doesn’t concern open vented system installations.
3. Set the external controls to call for heat.
4. Switch the boiler on by pressing the power button.
5. Check the pump is set to the correct mode (see table 15.1).
To do this, press the pump arrow button for no more than 2
seconds. The LED’s should signal an operating mode at the
place pointed by arrow.
6. If the LEDs are signalling a different operating mode than rec-
ommended in table 15.1, set the appropriate mode according
to the following instructions: press the pump arrow button for
longer than 2 seconds, but less than 10 seconds (LED’s will
start to ash),the pump then switches to the programming
mode. LEDs glows to indicate the current settings. To change
the settings of the pump in accordance with table 15.1, you
can set the right combination of glowing LEDs by pressing
the pump arrow button. Once the LED combination is set
correct, by not pressing the button for 10 seconds the pump
will remember this setting and will exit from the programming
mode back to performance view.
Note: holding the pump arrow button for more than 10
seconds will enter the pump into key lock mode. This
prevents the user from altering the pump settings. To
remove the key lock and allow the pump settings to be
changed, hold the pump arrow button again for more than
10 seconds.
7. Ensure adequate ow through the boiler is reached (the ‘H’
indicator is on with a constant light). The pump should self vent
after a short period of running. If necessary assist the venting
process in the following way; Warning the screw head in the
centre of the pump is not intended to be used to assist venting
of the pump, Damage to the pump internals may occur!
• close the isolation valve on the outlet,
• leave boiler running for 15 sec.
• open the isolation valve.
8. Set the external controls to the required program and the
boiler to the required system temperature, see the “Operating”
section.
In the case of a seized pump impeller due to a long layover
out of the heating season and simultaneous noncompliance
with the recommendation to cycle the pump every couple of
days, please restore proper movement of the impeller. To do
this, please use PH2 screwdriver, press and turn the screw
anti-clockwise, located in the middle of the front panel of the
pump (Figure 3) until the pump impeller is spinning freely.
Alarm status
If the pump has detected one or more alarms, the bicolored LED
1 switches from green to red. When an alarm is active, the LEDs
indi-cate the alarm type as dened in the table below. If multiple
alarms are active at the same time, the LEDs only show the error
with the highest priority. The priority is dened by the sequence of
the table. When there is no active alarm anymore, the user inter-
face switches back to operation mode.
Display Indication Pump
operation
Counter
action
One red LED
+ one yellow
LED (LED 5)
Rotor is
blocked.
Trying to start
again every
1,5 seconds
Wait or
deblock the
shaft..
One red LED
+ one yellow
LED (LED 4)
Supply voltage
too low
Only warning
pump runs
Control the
supply voltage
One red LED
+ one yellow
LED (LED 3)
Electrical error
Pump is
stopped be-
cause of low
supply voltage
or serious
failure
Control the
supply voltage
/Exchange the
pump


Rated
power
[kW]
Pump
lifting
height
[m]
LED 1
red
LED 2
yellow
LED 3
yellow
LED 4
yellow
LED 5
yellow
4 ● ●
9 5 ● ● ●
12 6 ● ● ● ●
14,4 7 ● ● ●
Table 15.1
Table 15.2

20
28.06.2017
 A- pressure[bar]
 B- ow[l/min]
 C- power[kW]
 D- temperature[0°C]
 E- digitaldisplay
 F- indicatorofmediumtemperaturesetting
  (forDHWcylinder)
 G- indicatorofroomthermostatandheatingactivity
  (forcentralheating)
 H- indicatorofpumpandowactivity
 I,J- inactiveindicators
 K- inlettemp.indicator
 L- outlettemp.indicator
 M- indicatorofboileractivity(forcentralheating)
 N- indicatorofboileractivity(forDHWcylinder)
 O- controlbuttons
13. Control panel
INDICATOR STATUS DETAILS
on room thermostat calling for heat
off room temperature has been achieved (boiler inactive)
flashing shower sensor activated appliance inactive (NA connection is open)
on pump is running, minimum system ow rate has been acheived
ashing insufcient ow rate (failure condition), (boiler inactive)
red boiler operating (boiler active)
green
system temp has been achieved (boiler inactive)
Temp in CH system is lower than set, however the room temperature has been achieved.
off no call for heat
red boiler heating (DHW)
green Cyl Temp achieved (DHW)
A ashing system pressure is low (below 0,5 bar), boiler inactive.
E dashes parameter out of range or a temp. sensor failure
K and L ickers
relevant temperature sensor failure
E EE message data record error