Heatrae Sadia Hotflo 10 User manual

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HOTFLO 10 / 15
Fitting Instructions and User Guide

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CONTENTS
SECTION PAGE
1.0 INTRODUCTION 2
2.0 TECHNICAL SPECIFICATION 3
3.0 INSTALLATION 4
4.0 COMMISSIONING 9
5.0 EXPLANATION TO USER 9
6.0 MAINTENANCE 10
7.0 FAULT FINDING 13
8.0 SPARE PARTS 14
9.0 ACCESSORIES 14
10.0 GUARANTEE 15
11.0 ENVIRONMENTAL INFORMATION 15
12.0 SPARES STOCKISTS 16
1.0 INTRODUCTION
Thank you for purchasing a Heatrae Sadia Hoto unvented water heater. The
Hoto water heater is manufactured in the UK to the highest standards and
has been designed to meet all the latest relevant safety specications.
This Hoto water heater must be installed, commissioned and maintained by
a competent person only. Please read and understand these instructions prior
to installing your Hoto unvented water heater. Particular attention should be
paid to the section headed IMPORTANT INSTALLATION POINTS.
Following installation and commissioning, the operation of the heater should
be explained to the user and these instructions left with them for future
reference.
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 the use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
WARNING: IF WATER FLOWS FROM THE PRESSURE RELIEF VALVE OR
TEMPERATURE/PRESSURE RELIEF VALVE THE ELECTRICITY SUPPLY
MUST BE SWITCHED OFF IMMEDIATELY. CONTACT THE
HEATRAE SADIA SERVICE TEAM (Tel: [phone]) OR AN
APPROVED INSTALLER.

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2.0 TECHNICAL SPECIFICATION
Electrical rating 2.2kW@240V~ / 2.0kW@230V~
Capacities 10 or 15 litres
Weight (full) 10 litre - 16.5kg
15 litre - 23.4kg
Rated pressure 0.6 MPa (6 bar)
Minimum supply pressure 0.08 MPa (0.8 bar)
15 Litre10 LitreDim e ns ion
613457A
656500B
516360C
NOTE: If fitting Pack U6 the valve will add
110mm to the overall height (Dimension B)
FIGURE 01: DIMENSIONS

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3.0 INSTALLATION
3.1 IMPORTANT INSTALLATION POINTS
3.1.1 The Hoto unvented water heater MUST be tted with a Pressure
(expansion) Relief Valve. This MUST be tted to the cold water supply
near the heater.
FAILURE TO PROVIDE ADEQUATE PRESSURE RELIEF WILL
INVALIDATE ANY GUARANTEE AND LEAD TO A DANGEROUS
INSTALLATION.
3.1.2 Expansion can take place within the cold water supply
PROVIDED THAT BOTH :
(a) Backow in the main is not prevented by any stopvalve with loose
jumper, check valve, pressure reducing valve or similar
AND
(b) Hot water expansion does not enter a branch to a cold water outlet
(see Figure 01, page 3 for expansion pipe lengths).
Note: Both the above conditions must be met. Additionally expansion
within the cold water supply will not be possible if the static supply
pressure exceeds 0.41 Mpa (4.1 bar).
3.1.3 If any of the conditions in 3.1.2 above cannot be met, expansion must
be accommodated using an Expansion Vessel. To ensure all expansion
takes place in the vessel, a Check Valve must also be tted (see Fig.
03, page 5). Use Accessory Pack U5 code no. 95 970 356.
3.1.4 If the static supply pressure exceeds 0.41 MPa (4.1 bar), a Pressure
Reducing Valve must be tted to the cold main supply. If a Pressure
Reducing Valve is used, an Expansion Vessel must also be used
(see Fig. 04, page 5). Use Accessory Packs U1 and U5 code no.’s
95 970 352 and 95 970 356.
3.1.5 Where specications demand the tting of a Temperature/Pressure
Relief Valve, one can be tted on site (see Fig. 04, page 5). Use
Accessory Pack U6 code no. 95 970 359. NOTE the tting of Pack
U6 does not alter the requirements detailed in points 3.1.2 to 3.1.4
above.
3.1.6 National Wiring rules may contain restrictions concerning the installation
of these units in bathrooms.
3.1.7 The installation must be carried out in accordance with the relevant
requirements of:
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland) or Building
Regulations (Northern Ireland).

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FIGURE 02: FOR INLET PRESSURES UP TO 0.41 MPa (4.1.BAR)
FIGURE 03: FOR INLET PRESSURES UP TO 0.41 MPa (4.1BAR) WHERE
EXPANSION IN MAIN SUPPLY IS NOT POSSIBLE
FIGURE 04: FOR INLET PRESSURES ABOVE 0.41 MPa (4.1BAR)

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3.2 LOCATION
3.2.1. The water heater should be vertically wall mounted using the screws
and plugs provided. Position the bottom two screws as shown in Figure
01, page 3 with heads 3mm from the wall. Hang the heater and secure
with the top screw. Alternatively it can be oor mounted on it’s base.
The water connections must always be to the top of the unit.
3.2.2 Enough space should be left at the top above the water heater for pipe
connections and access to the Temperature/Pressure Relief Valve (if
tted). Refer to Figure 01, page 3 and the Dimensions Table to determine
a suitable position for the heater.
3.2.3 NOTE: Ensure that the wall can support the full weight of the unit (see
TECHNICAL SPECIFICATIONS) and that there are no hidden services,
(electricity, gas, or water) below the surface of the wall.
3.2.4 DO NOT install where the water heater may freeze.
3.3 TERMINAL COVER REMOVAL
3.3.1 To remove the terminal cover, use a large at bladed screwdriver to
relieve the 3 snap lugs located in the top 3 rectangular depressions.
3.3.2 To re t the cover, locate the hinge at the back of the cover and slide
the snaps into place, taking care to ensure the thermostat spindle and
thermostat knob align correctly.
FIGURE 05: TEMPERATURE AND PRESSURE RELIEF VALVE

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3.4 PLUMBING
3.4.1 Refer to the section IMPORTANT INSTALLATION POINTS to determine
which valves and accessories are required. Plumb in the valves in the
sequence shown in the relevant Diagrams (Figures 02, 03, and 04,
page 5).
3.4.2 The INLET is marked BLUE and the OUTLET is marked RED. The
pipes are 15mm copper tube and are suitable for compression ttings.
It is recommended that a WRAS listed isolating valve (not supplied) is
tted on the cold water supply to the heater. Several hot outlets can be
served.
3.4.3 Do not use solder joints as this will damage the heater and may prevent
servicing under warranty.
3.4.4 Plumbers Paste must not be used as it can impair the operation of the
valves.
3.5 DISCHARGE
3.5.1 The discharge outlet from the Pressure (Expansion) Relief Valve and
the Temperature & Pressure Relief Valve (if tted) must be connected
to a discharge pipe. It is recommended that a tundish (not supplied)
be installed in the discharge pipe to give a visible indication that the
valves are operating.
3.5.2 The discharge pipe must be installed in a continuously downward
direction and in a frost free environment.
3.5.3 The pipe from the valves to the tundish should be 15mm o/dia minimum.
From the tundish to the point of discharge the pipe should be 22mm
o/dia minimum and have a resistance to ow equivalent to 9 metres
of straight pipe. Long discharge pipe runs should have an increased
internal diameter.
3.5.4 The pipe material should be capable of conveying water/steam at
100°C.
3.5.5 The nal discharge point should be in a safe, visible position.

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3.6 ELECTRICAL REQUIREMENTS
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 water heater.
3.6.1 The unit is supplied tted with a 0.75m 3 core 1.5mm2 exible cable.
The electricity supply should be fused 13 Amp and be via a double pole
isolating switch with a contact separation of at least 3mm in both poles.
Refer to Fig. 06 below.
3.6.2 The wires are colour coded as follows:
Green and Yellow EARTH
Brown LIVE (L)
Blue NEUTRAL (N)
ELEM ENT
NEON
RESET BUTTON
EA RTH
POST
(STAT/CUT-OUT
PLUGS DIRECTLY
ONTO ELEMENT
TERMINATIONS).
DOUBLE POLE
ISOLATING SWITCH
BROWN
BLUE
GREEN/ YELL OW
MAINS
SUPPLY
L
N
FIGURE 06 : WIRING DIAGRAM
IM PORTANT: THE COMBINED THERMOSTAT/ CUT-OUT MUST BE PUSHED FULLY
HOMETO ENSURECORRECT OPERATION OF THE CUT-OUT
CO M BI N ED
THERM OSTAT
& CUT-OUT
THERM OSTAT
PO CKET
ELEM EN T
TERM I N A L S
CORRECT I N CO RRECT

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4.0 COMMISSIONING
4.1 Do not switch on the electrical supply until the unit has been lled with
water and checked for leaks.
4.2 Check that all installation, electrical and discharge pipe requirements
have been met.
4.3 Check that all water and electrical connections are tight.
4.4 Open a hot water tap, turn on mains water supply to the heater.
4.5 Allow unit to ll and leave hot tap running for a short while to purge any
air and ush out the pipework. Close the hot tap and check the system
for leaks.
4.6 Manually test the operation of the Pressure (Expansion) Relief Valve
and, if tted, the Temperature/Pressure Relief Valve. Ensure water ows
freely from the valve(s) and through the discharge pipes.
4.7 Switch on the electrical supply. The indicator light will illuminate during
heating. When the set temperature is reached the indicator light will go
out.
5.0 EXPLANATION TO USER
Following Installation and Commissioning of the water heater the operation
should be fully explained to the user:
5.1 HOT WATER
5.1.1 Indicate the location of the water heater and identify the outlets to
which it is connected.
5.1.2 Explain that the indicator light will be illuminated when the unit is
heating.
5.2 SETTING THE TEMPERATURE
5.2.1 The temperature can be set between the minimum setting (10°C) and
the maximum setting (70°C) by rotating the dial on the thermostat.
5.2.2 It is recommended that the temperature is set above 60°C.
5.3 DISCHARGE
5.3.1 Explain that water may drip from the discharge pipe of the pressure
relief valves/s and that this pipe must be left open to atmosphere.
5.3.2 Explain that if water ows from any safety valve tted, the electrical
supply to the water heater should be switched off immediately. The
electrical supply should not be switched on again until the water heater
has been checked and approved by a qualied installer.

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5.4 SYSTEM MALFUNCTION
5.4.1 Explain how to isolate electrical and water supplies incase of a fault.
5.4.2 Explain that a qualied plumber and / or electrician should be contacted
if there is a fault.
5.4.3 Explain how to identify / check basic faults.
5.5 SYSTEM MAINTENANCE
Explain the necessity to carry out regular maintenance of the water heater to
ensure it’s continued safe and efcient operation.
5.6 LITERATURE
Hand over the installation and user instructions
6.0 MAINTENANCE
WARNING: Disconnect from all electrical supplies before beginning any work
on the water heater. Water contained in the water heater may be very hot!
To ensure the continued safe and efcient operation of the water heater, it
should be regularly maintained.
In hard water areas the water heater will require periodic descaling.
Maintenance and servicing should be carried out by a competent person
and any replacement parts used should be authorised Heatrae Sadia spare
parts.
6.1 RE SETTING THE THERMAL CUTOUT
6.1.1 Switch off and disconnect the electrical supply, turn off the water supply
to the unit and remove the terminal cover.
6.1.2 Press the thermal cut out button (see Figure 06, page 8).
NOTE: If the thermal cut out continues to operate, check the operation of the
thermostat and the element plate assembly.

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6.2 DRAINING THE WATER HEATER
6.2.1 Switch off and disconnect the electrical supply. Turn off the water supply
to the unit.
6.2.2 Open a hot tap to relieve any system pressure. Disconnect the plumbing
connections to the unit and remove (note full weights of units, page 3).
Empty unit through the outlet connection.
6.3 DESCALING
6.3.1 Switch off and disconnect the electrical supply, turn off the water supply
to the unit and remove the terminal cover.
6.3.3 Disconnect the electrical terminations to the thermostat. Disconnect
earth links to the earthing stud.
6.3.4 Remove the element plate assembly by unscrewing the ve securing
screws, tapped jacking points are provided. Remove any loose scale
from the container. Carefully clean off any scale from the element and
thermostat pocket. DO NOT clean scale from interior container walls.
6.3.5 Re-t the element plate assembly using a new sealing gasket. Note
the correct orientation of the element plate by reference to Figure 07
above. Rewire the unit with reference to Figure 06, page 8 .
6.3.6 Ret the cover.
6.3.7 Re-commission the unit following the INSTALLATION and
COMMISSIONING instructions.
FIGURE 07: ELEMENT PLATE ORIENTATION
CABLE
CLAMP
EARTH
POST
INLET
OUTLET
COMBINED
THERMOSTAT
AND THERMAL
CUT OUT

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6.4 SAFETY VALVES
The Pressure (Expansion) Relief Valve and, if tted, the Temperature/Pressure
Relief Valve should be operated regularly to remove lime deposits and to verify
that it is not blocked. Manually operate the valves by either twisting the cap or
lifting the lever. Ensure water ows freely from the valve(s) and through the
discharge pipes. Ensure the valve(s) reseat correctly when released.
6.5 EXPANSION VESSEL PRESSURE
6.5.1 The Expansion Vessel, if tted, should have a precharge pressure of
4.1 bar (60 p.s.i.). This can reduce over time and eventually require
re-charging. To do this:
6.5.2 Turn off water supply to the unit; open a hot tap to relieve system
pressure.
6.5.3 Remove dust cap from top of Expansion Vessel
6.5.4 Check pre-charge pressure using a tyre pressure gauge. If the pressure
is lower than 4.1 bar (60 p.s.i.) it should be recharged using a tyre pump
(Schraeder Valve type). DO NOT OVER CHARGE.
6.5.5 Re-check pressure and when correct replace dust cap.
6.5.6 Turn on mains water supply and close hot tap.
6.6 SUPPLY CORD
If the supply cord is damaged the water heater should be switched off until
the supply cord can be replaced by a competent electrician or a Heateam
Engineer in order to avoid a hazard.

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7.0 FAULT FINDING
WARNING: Disconnect from all electrical supplies before beginning any work
on the water heater. Water contained in the water heater may be very hot!
The water heater should give trouble free operation, however should a
problem occur, the tables 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 spare parts.
ACTION
POSSIBLE CAUSES
FAULT
1. Check electrical supply
1. Electrical supply fault
Water not heating
WiringDiagram, page 8)
replace thermostat/thermal cut-out (see
check thermostat operation. If necessary
2. Check cut-out, if operated reset and
2. Thermal cut-out tripped
necessary
3. Check thermostat operation, replace if
3. Thermostat fault
POINTS, page 4)
U2 (see IMPORTANT INSTALLATION
Fit Pressure Reducing Valve Pack U1 and
pressure
Excessive mains water
(continuously)
Pressure Relief Valve
Discharge of water from
INSTALLATION POINTS, page 4)
1. Fit Pack U2 (see IMPORTANT
possible
1. Expansion in mains not
(intermittently)
Presure Relief Valve
Discharge of water from
2. Fit Packs U1 and U2
4.1 bar (60 p.s.i.)
2. Mains pressure exceeds
3. Fit Pack U2 when using Pack U1
Pack U2
3. Pack U1 fitted without
4. Replace Pressure Relief Valve
4. Pressure Relief Valve Fault
(see Section 6.5)
Expansion Vessel pre-charge pressure
5. Check and, if necessary, re-charge
Expansion Vessel
5. Loss of pressure from
Replace thermostat and thermal cut-out
cut-out fault
Thermostat and thermal
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Discharge of water from
in accordance with flow direction arrows
1. Check all valves are correctly installed
fitted
1. Inlet valves incorrectly
No water flow
2. Check mains water supply is on
turned on
2. Mains water supply not
fitted check the strainer is not blocked
3. Check for obstructions. If Pack U1 is
supply
3. Blockage in mains water
while.
milkiness will disappear after a short
oxygen bubbles when flowing. The
Water from a pressurised system releases
Oxygenated water
"Milky" water

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8.0 SPARE PARTS
WARNING: Disconnect from all electrical supplies before beginning any work
on the water heater. Water contained in the water heater may be very hot!
To ensure the continued safe and efcient operation of the water heater, it
should be regularly maintained.
Maintenance and servicing should be carried out by a competent person
and any replacement parts used should be authorised Heatrae Sadia spare
parts.
DESCRIPTION CODE No.
Element plate assembly - 10 litre 2.2kW 95 606 940
Element plate assembly - 15 litre 2.2kW 95 606 941
Combined thermostat/thermal cut-out 95 612 633
Indicator light 95 607 992
Element plate gasket 95 611 708
Pressure (Expansion) Relief Valve 95 607 986
Temperature/Pressure Relief Valve 95 970 359
Check Valve 95 607 987
Expansion Vessel 95 607 988
Pressure Reducing Valve 95 607 989
Top cover moulding 95 614 186
Terminal cover c/w thermostat knob 95 614 182
9.0 ACCESSORIES
The heater can be used to supply several hot water outlets via conventional
taps. It is not recommended for supplying a shower. Individual site
demands should be considered when choosing capacity and the number of
outlets to be served.
A Thermostatic Blending Valve can be used in conjunction with this unit.
Accessory Pack U3 (code no. 95 970 354) is recommended. Follow the
installation instructions supplied with the valve for connection to the system.

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10.0 GUARANTEE
This product is guaranteed against faulty materials and manufacture for a
period of 2 years from the date of purchase provided that:
1. The unit has been installed in accordance with the Installation and
User Instructions and all relevant Codes of Practice and Regulations
in force at the time of installation, and that all necessary controls and
safety valves have been tted correctly.
2. Any valves and controls are of the Heatrae Sadia recommended type
and specication.
3. The unit has not been modied or tampered with in any way and has
been regularly maintained as detailed in the Installation and User
Instructions.
4. The unit has been used only for heating potable water.
The unit is not guaranteed against damage by frost and the inner container
with integral immersion heater is not guaranteed against excessive scale
build-up.
This Guarantee in no way affects the statutory rights of the consumer.
The policy of Heatrae Sadia is one of continuous product development and,
as such, we reserve the right to change specications without notice.
11.0 ENVIRONMENTAL INFORMATION
Heatrae Sadia products are manufactured from many recyclable materials.
At the end of their useful life they should be disposed of at a Local Authority
Recycling Centre in order to realise the full environmental benets. Insulation
is by means of CFC-free polyurethane foam.
This water heater does not contain substances harmful to health; it does not
contain any asbestos.

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12.0 SPARES STOCKISTS
For the fast and efcient supply of spares, please contact the stockists listed
below:
Advanced Water Company Ltd.
Unit D5 Enterprise way, Vale Park,
Evesham, Worcs, WR11 1GS
Tel: [phone]
Fax: [phone]
Electric Water Heating Co.
2 Horsecroft Place, Pinnacles
Harlow, Essex, CM19 5BT
Tel: [phone]
E-Mail: [email protected]
SPD
Units 9 & 10 Hexagon Business Centre
Springeld Road, Hayes, Middlesex, UB40 0TY
Tel: [phone]
Parts Centre
Tel: [phone]
www.partscentre.co.uk
Newey & Eyre
Specialist Products Division
Please contact your local branch
UK Spares Ltd.
Unit 1155 Aztec West
Almonsbury, Bristol, BS32 4TF
Tel: [phone]
William Wilson Ltd.
Unit 3A, 780 South Street
Whiteinch, Glasgow, G14 OSY
Tel: [phone]
Heatrae Sadia Heating
Hurricane Way Norwich NR6 6EA
www.heatraesadia.com
Service: 0844 8711535
Sevice Fax: [phone]
E-mail: heatraesadiaservice
@heateam.co.uk
36005719_issue_05
©2011