Heatrae Sadia Multipoint 50 User manual

MULTIPOINT SS V 50/80 & 100
Fitting Instructions and User Guide

2
CONTENTS
SECTION PAGE
1.0 INTRODUCTION 3
2.0 TECHNICAL SPECIFICATION 4
3.0 INSTALLATION 7
4.0 COMMISSIONING 14
5.0 EXPLANATION TO CUSTOMER 15
6.0 MAINTENANCE 15
7.0 SPARE PARTS 18
8.0 FAULT FINDING 20
9.0 ACCESSORIES 21
10.0 GUARANTEE 22
11.0 ENVIRONMENTAL INFORMATION 23
12.0 SPARES STOCKISTS 24

3
1.0 INTRODUCTION
Thank you for purchasing a Heatrae Sadia Multipoint SS unvented water
heater. The Multipoint SS water heater is manufactured in the UK to the
highest standards and has been designed to meet all the latest relevant
safety specications.
1.1 IMPORTANT POINTS
The Multipoint SS must be installed and commissioned by a competent
person. Please read and understand these instructions before installing the
Multipoint SS. Following installation and commissioning, the operation of the
Multipoint SS should be explained to the user and these instructions left with
them for future reference.
The Multipoint SS 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
the use of the appliance by a person responsible for their safety.
Children should be supervised to ensure they do not play with the Multipoint
SS.
The Multipoint SS hot water cylinder is of unvented type. Its installation is
subject to Building Regulation G3 (England and Wales), Technical Standard
P3 (Scotland) or Building Regulation P5 (Northern Ireland). Installation must
be carried out by a competent person.
Electrical installation must be carried out in accordance with the current IEE
Wiring Regulations.
Prior to installation the unit should be stored in an upright position in an
area free from excessive damp or humidity.

4
1.2 PACK CONTENTS
Before commencing installation please check that the following
components have been supplied in the Installation Kit:
Multipoint SS Unit (x1)•
Expansion vessel 3/4” BSP male, precharge pressure 3.5bar (x1)•
Expansion vessel wall mounting bracket (x1)•
Pressure reducing valve 3.5 bar, 22mm x 22mm compression (x1)•
Single check valve 22mm x 22mm compression (x1)•
Pressure (expansion) Relief Valve 1/2”BSP x 1/2”BSP female, factory•
set at 6 bar (x1)
Tundish, 22mm x 15mm compression (x1)•
3/4” compression nuts (x2)•
Copper olive, 22mm (x2)•
Element plate tool (x1)•
Mounting brackets (x4)•
User Instructions•
Guarantee Card•
2.0 TECHNICAL SPECIFICATION
Electrical Rating 3.0kW @ 240v / 2.8kW @ 230v
Capacity 50,80 & 100 litres
Weight (100 Litre) 30Kg (empty), 130Kg (full)
Weight (80 Litre) 24Kg (empty), 104Kg (full)
Weight (50 Litre) 18Kg (empty), 68Kg (full)
Operating pressure 0.35 MPa (3.5 bar)
Rated pressure 0.6 MPa (6.0 bar)
Expansion vessel charge pressure 0.35 MPa (3.5 bar)
Expansion relief valve setting 0.6 MPa (6.0 bar)
Minimum supply pressure 0.08 MPa (0.8 bar)
Maximum supply pressure to PRV 1.6 MPa (16.0 bar)
Temperature / Pressure Relief Valve 90°C / 1.0 MPa (10.0 bar)

5
PERFORMANCE
TABLE 01: Multipoint SS Performance; Heatup, Recovery & Heat Loss
MODEL HEAT UP TIME
(MINS)
RECOVERY
(MINS)
STANDING HEAT-
LOSS kWhr/24hr
50 litre 1.5kW 98 64 0.6
50 litre 3.0kW 49 32 0.6
80 litre 1.5kW 162 112 0.8
80 litre 3.0kW 81 56 0.8
100 litre 1.5kW 208 146 1.0
100 litre 3.0kW 104 73 1.0
Heat up times are based on heating from 20°C through 45°C tempera-•
ture rise.
Recovery times are based on heating 70% of capacity through 45°C.•
Standing heat losses are based on an ambient air temperature of 20°C•
and a stored water temperature of 65°C.

6
DIAGRAM 01: MULTIPOINT SS WATER HEATER- DIMENSIONS & IMPORTANT FEATURES
01 TEMPERATURE/PRESSURE RELIEF VALVE
02 THERMOMETER
03 COMBINED THERMOSTAT & CUT OUT
04 ELEMENT
05 TERMINAL BLOCK
06 CABLE CLAMP
07 HOT OUTLET
08 CONTROL KNOB
09 COLD INLET
10 INDICATOR LIGHT
DIMENSION 50 LITRE 80 LITRE 100 LITRE
A 705 963 1151
B 802 1060 1248
300
451
100
'B'
'A'
01
02
08 10
07 09
472
104
04
06
05
03

7
3.0 INSTALLATION
Warning: this appliance must be earthed. It is suitable for A.C. supply only.
Electrical installation must be carried out by a competent electrician and be
in accordance with the latest I.E.E. wiring regulations.
Ensure the electrical supply is switched off before making any connections
to the Multipoint SS.
The Multipoint SS unvented water heater is factory tted with a Temperature/
Pressure Relief Valve which must not be removed, blocked or restricted in
any way.
Expansion MUST be accommodated within the system. The expansion ves-
sel & check valve provided in the installation kit must be installed and will
fulll this function.
3.1 LOCATION
Using Diagram 01 and the dimensions table as a guide mark the positions1.
of the xing points. Drill and plug the wall with suitable xings.
Fix the top two xings rst followed by the bottom two xings.2.
The Multipoint SS must be plumb and vertically wall mounted using the3.
wall brackets tted to the heater. The water connections must always be
at the bottom of the unit.
Enough space should be left below the unit for pipe connections and4.
above the unit for access to the Temperature/Pressure Relief Valve (400
mm minimum). Refer to Diagram 01 and the Dimensions Table to deter-
mine a suitable position for the heater.
Ensure that the wall can support the full weight of the unit and that there5.
are no hidden services (electricity, gas or water) below the surface of the
wall.
DO NOT install where the unit may freeze.6.
DO NOT install in direct sunlight or where the unit is open to the ele-7.
ments.
The latest IEE wiring regulations may contain restrictions concerning the8.
installation of these units in bathrooms.
NOTE: THE MULTIPOINT WATER HEATER IS HEAVY. PRIOR TO FIXTURE
ENSURE THE WALL IS STRONG ENOUGH TO TAKE THE WEIGHT OF THE
WATER HEATER WHEN FULL.

8
Multipoint SS
50, 80, 100
Litre
Heater
DIAGRAM 02: PLUMBING SCHEMATIC
No other valves should be placed between the expansion valve and the
Multipoint SS cylinder. The expansion valve connection must not be used for
any other purpose.
3.2 PLUMBING
To make installation of the Multipoint SS easier it is supplied with a Non1.
Return Valve, Expansion Vessel and Pressure Relief Valve.
Plumb the Multipoint water heater as shown below in Diagram 02. Ensure2.
the Pressure Reducing Valve is installed in the correct orientation by
reference to the direction of the ow arrow marked on it.
The water connections to the unit are 3/4” BSP male with Ø22 mm3.
compression ttings suitable for Ø22 mm copper pipe.
Inlet and outlet are colour coded accordingly for hot and cold. Several4.
hot outlets via conventional taps can be served, however, individual site
demands should be considered when choosing capacity and the number
of outlets.
It is recommended that a WRAS listed isolating valve (not supplied) is5.
tted on the cold water supply to the heater before the Pressure Reducing
Valve.
Plumbers Paste must not be used as it can impair the operation of the6.
valves.

9
3.3 DISCHARGE
It is a requirement of Building Regulations that any discharge from an unvented
system should be visible and safely conveyed away from the system without
danger to persons in or about the building where it is installed. The discharge
pipe should be tted in accordance with the requirements and guidance notes
of Building Regulations. Building Regulation G3 Requirements and Guidance
section 3.9 are reproduced in the following sections.
Information Sheet No.33 available from the British Board of Agrement gives
further advice on discharge pipe installation. For discharge pipe arrangements
not covered by G3 Guidance or BBA Info sheet No. 33 advice should be sought
from your local Building Control Ofcer. The discharge pipework will convey
any discharge from the unvented cylinder Temperature and Pressure Relief
Valve. (A discharge pipe will also be required from the Expansion Valve tted
to the Cold Water Combination Valve) Where practical this can be feed into the
discharge pipe from the Multipoint SS. It is recommended that an additional
tundish is tted into this discharge pipe to give an early indication of operation
of the Expansion Valve.
In some instances it may be possible to discharge into an internal waste system
and soil stack. To do this a self sealing waste valve must be tted into the
discharge pipe after the tundish to prevent foul odours or back-pressurisation
from the waste system entering the building via the tundish. In these systems
it is essential that the tundish is tted in a visible position as the nal point of
discharge will not be visible. Consult the manufacturer’s recommendations
with respect to the correct tting, orientation and waste and soil stack materials
selection. It will also be necessary to get dispensation from your local Building
Control Ofcer to discharge in this manner. Discharges from an unvented
system can be up to 95oC for several minutes, ensure any waste or soil pipe
connected to the discharge can safely accept these conditions.
G3 REQUIREMENT
“…there shall be precautions…to ensure that the hot water discharged from
safety devices is safely conveyed to where it is visible but will not cause
danger to persons in or about the building.”
Water may drip from the discharge pipe of the pressure-relief device and that
this pipe must be left open to the atmosphere.

10
The expansion relief valve is to be operated regularly to remove lime deposits
and to verify that it is not blocked.
The discharge pipe connected to the pressure relief device is to be installed
in a continuously downward direction and in a frost free environment
G3 GUIDANCE SECTION 3.9
The discharge pipe (D1) (see Diagram 03, page 12) from the vessel up to
and including the tundish is generally supplied by the manufacturer of the hot
water storage system. Where otherwise, the installation should include the
discharge pipe(s) (D1) from the safety device(s). In either case 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 / pressure relief valve.
The discharge pipe (D2) from the tundish should terminate in a safe place
where there is no risk to persons in the vicinity of the discharge, preferably
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 hydraulic resistance exceeds that of a
straight pipe 9m long i.e. discharge pipes between 9m and 18m equivalent
resistance length should be two pipe sizes larger, and so on. Bends must
be taken into account in calculating the ow resistance. Refer to table 02
page 12 and the worked example.
b. Have a vertical section of pipe at least 300mm long below the tundish before
any elbows or bends in the pipework.
c. Be installed with a continuous fall.
d. Have discharges visible at both the tundish and nal point of discharge,
but where this is not possible or is practically difcult there should be clear
visibility at one or other of these locations.
An alternative approach for sizing discharge pipes would be to follow
BS6700:1987 Specication for design, installation, testing and maintenance of
services supplying water for domestic use within buildings and their cartilages,
appendix E, section E2 and table 21.
Examples of acceptable discharge arrangements are:
i. Ideally below a xed grating and above the water seal in a trapped gully.
ii. Downward discharges at low level; i.e. up to 100mm above external
surfaces such as car parks, hard standings, grassed areas etc. are

11
acceptable providing that where children may play or otherwise come into
contact with discharges a wire cage or similar guard is positioned to prevent
contact, whilst maintaining visibility.
iii. Discharges at high level; e.g. into a 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 plastics guttering system that would collect such discharges
(tundish visible).
iv. 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 discharging can be traced reasonably easily. The
single common discharge pipe should be at least one pipe size larger than
the largest individual discharge pipe (D2) 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.
Note: The discharge will consist of scalding water and steam. Asphalt, roong
felt and non-metallic rainwater goods may be damaged by such discharges.
Worked example of discharge pipe sizing:
The example below is for a G1/2 temperature relief valve with a discharge
pipe (D2) having 4 No. elbows and length of 7m from the tundish to the point
of discharge.
From Table 02:
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 allowed for 4 No. 22mm elbows at 0.8m each•
= 3.2m
Therefore the 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 18m
Subtract the resistance of 4 No. 28mm elbows at 1.0m each = 4.0m•
Therefore the maximum permitted length equates to 14.0m•
As the actual length is 7m, a 28mm (D2) copper pipe will be•
satisfactory.

12
Fixed grating
Discharge below
fixed grating
(Building Regulation
G3 section 3.9d gives
alternative points
of discharge)
Trapped
gully
Discharge pipe (D2) from tundish,
with continuous fall. See Building
Regulation G3 section 3.9d i-iv,
Table 4 and worked example
300mm
minimum
600mm maximum
Metal discharge pipe (D1) from
Temperature relief valve to tundish
Tundish
Safety device
(e.g. Temperature
relief valve)
DIAGRAM 03: DISCHARGE PIPE ARRANGEMENT
TABLE 02: Sizing of copper discharge pipe (D2) for common T&P relief valve
sizes.
Valve
outlet
size
Minimum
size of
discharge
pipe D1
Minimum size
of discharge
pipe D2 from
tundish
Maximum resistance
allowed, expressed
as a length of straight
pipe (i.e. number of
elbows or bends)
Resistance
created by
each bend.
G1/2 15mm 22mm
28mm
35mm
up to 9m
up to 18m
up to 27m
0.8m
1.0m
1.4m
G3/4 22mm 28mm
35mm
42mm
up to 9m
up to 18m
up to 27m
1.0m
1.4m
1.7m
G1 28mm 35mm
42mm
54mm
up to 9m
up to 18m
up to 27m
1.4m
1.7m
2.3m

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3.4 ELECTRICAL
WARNING: THIS APPLIANCE MUST BE EARTHED. IT IS SUITABLE FOR
A.C. SUPPLY ONLY. DISCONNECT THE ELECTRICAL SUPPLY BEFORE
REMOVING THE BASE COVER. INSTALLATION MUST BE IN ACCORD-
ANCE WITH THE CURRENT I.E.E. REGULATIONS.
The electrical supply to the property must be checked to ensure it is of1.
sufcient current rating and voltage.
The immersion heater supply must include a 16A MCB in the circuit.2.
The circuit must incorporate a double pole isolating switch with a contact3.
separation of at least 3mm in both poles.
The supply cable should be 2.5mm² 3 core HOFR sheathed and must be4.
routed via the cable seal and entry provided with the outer sheath of the
cable rmly secured by tightening the screws on the cable clamp.
The wires are colour coded as follows:5.
Green and Yellow EARTH
Brown LIVE (L)
Blue NEUTRAL (N)
The Multipoint SS water heater has one heating element. The heating6.
element is controlled by a combined themostat and thermal cut out, refer
to Diagram 04 for wiring details.
DO NOT OPERATE THE IMMERSION HEATER UNTIL THE MULTIPOINT7.
SS HAS BEEN FILLED WITH WATER.
CUT-OUT SENSOR
THERMOSTAT SENSOR
COMBINED THERMOSTAT
AND CUT OUT
TO ELEMENT
GREEN&YELLOW
BROWN/RED
BLUE/BLACK
ELEMENT EARTH
LIVE (RED)
NEUTRAL (BLACK)
TERMINAL BLOCK
CUT OUT
RESET
A B
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DIAGRAM 04: WIRING DIAGRAM
NEON POWER INDICATOR

14
4.0 COMMISSIONING
4.1 PLUMBING
WARNING: Water that is left standing in a stainless steel water cylinder for long
periods without draw-off will become de-oxygenated and potentially corrode
the vessel material. If the installation is to be left unused following installation
and commissioning, the water cylinder must be drained or regularly ushed
(once a week) through with fresh mains water.
Check that all installation and discharge pipe requirements have been1.
met.
Check that all water connections are tight.2.
Open a hot water tap, turn on mains water supply to the Multipoint SS.3.
Allow Multipoint SS to ll and leave hot tap running for a short while to 4.
purge any air and ush out the pipework. Close the hot tap and check
the system for leaks.
Manually test the operation of the Temperature/Pressure Relief Valve and5.
the Pressure (expansion) Relief Valve. Ensure water ows freely from the
valves and through the discharge pipes.
4.2 ELECTRICAL
PRELIMINARY CHECKS
Ensure all power supplies are switched off.
Check all electrical connections are tight.
Check all earth bonding links are connected, tight and un-damaged.
Check earth continuity, short circuits, polarity and resistance to earth.
Do not switch on the electrical supply until the Multipoint SS has been1.
lled with water and checked for leaks.
Check that all electrical requirements have been met.2.
Check that all electrical connections are tight.3.
Switch on the electrical supply. The indicator light will illuminate during4.
heating. When the set temperature is reached the indicator light will go
out.
The set temperature can be adjusted by rotating the control knob. This5.
can be set to give temperatures in the range 10°C to 70°C. In hard water
areas it is advised that the maximum temperature is restricted to prevent
build up of scale.

15
5.0 EXPLANATION TO USER
The Multipoint SS unvented heater stores water at the temperature set on1.
the adjustable control knob. This can be set to give temperatures in the
range 10°C to 70°C. In hard water areas it is advised that the maximum
temperature is restricted to prevent build up of scale. To avoid risk of
freezing when the heater is not in use for long periods during the winter
months, do not switch off the electrical supply and set the thermostat to
its minimum position. N.B. This will not protect other system pipework.
The indicator lights will be illuminated when the unit is heating.2.
To ensure the heater continues to operate at its optimum performance3.
it should be periodically maintained in accordance with the instructions
given under the section headed MAINTENANCE.
IMPORTANT NOTES TO USER
DO NOT BLOCK OR RESTRICT THE DISCHARGE FROM ANY SAFETY•
VALVE FITTED.
DO NOT TAMPER WITH ANY SAFETY VALVE FITTED.•
IF WATER DISCHARGES FROM ANY SAFETY VALVE FITTED SWITCH•
OFF THE ELECTRICAL SUPPLY TO THE UNIT IMMEDIATELY. CONTACT
THE HEATRAE SADIA SERVICE TEAM (TEL: [phone]) OR AN
APPROVED INSTALLER. DO NOT TURN THE ELECTRICAL SUPPLY
ON AGAIN UNTIL THE UNIT HAS BEEN CHECKED AND APPROVED
BY A QUALIFIED INSTALLER.
6.0 MAINTENANCE
WARNING: DISCONNECT FROM ALL ELECTRICAL SUPPLIES BEFORE
BEGINNING ANY WORK ON THE MULTIPOINT SS. FLUID CONTAINED
IN THE CYLINDER MAY BE VERY HOT!
To ensure the continued safe and efcient operation of the Multipoint SS it
should be regularly maintained.
Maintenance should be carried out by a competent person and any replacement
parts used should be authorised Heatrae Sadia Multipoint SS spare parts.
It is recommended that maintenance is carried out annually and should include
the checks detailed in the sections on page 16 & 17.

16
6.1 DESCALING
Little maintenance is required, however in hard water areas the unit will
require periodic descaling to ensure efcient operation. To descale the unit:
Switch off and disconnect the electrical supply. Turn off the water1.
supply to the unit.
Open a hot tap to relieve any system pressure. Empty unit by opening2.
the drain cock in the inlet pipework.
Remove the terminal cover by removing the two supporting screws3.
holding it in place.
Disconnect the electrical terminals to the element. Withdraw the4.
thermostat and thermal cut-out capillary tubes from the pockets on the
element plate.
Remove the element plate assembly by unscrewing the element5.
backnut using the element tool provided (NOTE: a quantity of water
may still be present in the container, it is recommended that a container
be placed under the unit to collect any spillage).
Remove any loose scale from the container. Carefully clean off any scale6.
from the element and thermostat pocket. DO NOT clean scale from interior
container walls.
Re-assemble the element plate assembly tting a new sealing gasket. 7.
Rewire the unit with reference to Diagram 04 (wiring diagram).
Re-commissiontheunitfollowingtheINSTALLATION andCOMMISSIONING8.
instructions.
6.2 SAFETY VALVES
The Temperature/Pressure Relief Valve and the Pressure (Expansion) Relief
Valve should be regularly checked. To check the valves:
Manually operate the valve by twisting the cap. Ensure water ows 1.
freely from the valves and through the discharge pipes (NOTE: the water
discharged may be very hot). Ensure the valves reseat correctly when
released.
Clean the strainer incorporated in the Pressure Reducing Valve.2.
To inspect and clean the strainer turn off the mains water supply to the
heater and open a hot tap to relieve the system pressure. Unscrew the
black cap from the Pressure Reducing Valve and remove. The strainer will
be removed with the cap. Wash any particulate matter from the strainer
under COLD CLEAR WATER ONLY. Replace the cap assembly ensuring
the sealing ring is correctly tted. Do not use any other type of sealant.
Close hot tap, open mains stop cock and check for leaks.

17
6.3 EXPANSION VESSEL PRECHARGE PRESSURE
The Expansion Vessel should have a precharge pressure of 3.5 bar (51p.s.i.).
This can reduce over time and eventually require re-charging. To do this:
Turn off water supply to the unit; open a hot tap to relieve system1.
pressure.
Remove dust cap from top of Expansion Vessel.2.
Check pre-charge pressure using a tyre pressure gauge. If the pressure3.
is lower than 3.5 bar (51 p.s.i.) it should be recharged using a tyre pump
(Schraeder Valve type). DO NOT OVER CHARGE.
Re-check pressure and when correct replace dust cap.4.
Turn on mains water supply and close hot tap.5.

18
7.0 SPARE PARTS
The following comprehensive list of spare parts is available for your Multipoint
SS water heater. Please refer to the Rating Label on the side of your heater
before ordering to ensure the correct spare part is obtained.
Do not replace with parts not recommended by Heatrea Sadia. This will
invalidate your guarantee and may render the installation dangerous.
TABLE 03: Spare parts list
PART DESCRIPTION PART NUMBER
1 Thermostat / Thermal Cut Out 95 607 256
2 Element Plate Assembly - 3.0kW 95 606 979
3 Indicator Light 95 615 063
4 Element Tool (Not Shown) 95 607 861
5 Element Backnut 95 607 869
6 Thermometer 95 607 258
7 Electrical Cover & Screws (x2) 95 614 116
8 Thermometer Bezel 95 605 087
9 Blanking Plate 95 605 881
10 Element Gasket 95 611 822
11 Electrical Cover Gasket 95 611 015
12 Pressure Reducing Valve (Not Shown) 95 605 082
13 Expansion Relief Valve 6 Bar (Not Shown) 95 605 083
14 Compression Nuts & Olives (Not Shown) 95 607 253
15 Temperature and Pressure Relief Valve 95 605 084
16 Expansion Vessel 12ltr (Not Shown) 95 607 316
17 Expansion Vessel Bracket (Not Shown) 95 607 317
18 Tundish (Not Shown) 95 605 838
19 Safety Valve 6 Bar (Export Only) 95 605 085
20 3/4” to 1/2” Pipe Adapter (x2) (Export Only) 95 607 318

19
15
20
19
11
07
05
02
01
10
06
08
09
03
DIAGRAM 05: SPARE PARTS

20
8.0 FAULT FINDING
WARNING: DISCONNECT FROM ALL ELECTRICAL SUPPLIES BEFORE
BEGINNING ANY WORK ON THE MULTIPOINT SS. FLUID CONTAINED
IN THE CYLINDER MAY BE VERY HOT!
The Multipoint SS should give trouble free operation, however should a
problem occur, the table below should enable most faults to be identied
with ease.
Fault Finding should be carried out by a competent person and any replacement
parts used should be authorised Heatrae Sadia Multipoint SS spare parts.
TABLE 04: Fault nding table
FAULT POSSIBLE CAUSE REMEDY
Water not heating Electrical supply fault.
Thermal cut out tripped.
Check electrical supply. Check cut out. If
operated then reset. Check thermostat &
replace if necessary.
Thermostat setting to low
or faulty.
Check and adjust setting if required. Re-
place if necessary.
Discharge of water from pres-
sure relief valve
(continuously).
Excessive mains water
pressure.
Check pressure from pressure reducing
valve. Replace if greater than 3.5bar (51psi)
Expansion relief valve fault. Replace expansion relief valve.
Discharge of water from pres-
sure relief valve
(intermittently).
Loss of pressure from
expansion vessel.
Check and if necessary recharge expan-
sion vessel precharge pressure.
Discharge of water from
temperature/pressure relief
valve and/or water/steam from
pressure relief valve
Thermostat and thermal cut
out fault.
Replace combined thermostat & thermal
cut out.
No water 󰘱ow Product incorrectly installed. Check inlet & outlet connections are cor-
rect. Check valves are installed in accord-
ance with 󰘱ow direction marks.
Mains water supply not
turned on.
Check mains water supply is turned on.
Blockage in mains water
supply.
Check mains water supply for obstructions.
Check expansion relief valve.
Check strainer in pressure reducing valve.
“Milky water” Oxygenated water Water from a pressurised system releases
oxygen bubbles when 󰘱owing. The milki-
ness will disappear after a short while.