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Installation and User Instructions
Unvented Electric Storage Water Heater
Models: S10UNV, S15UNV.
Please read and understand these instructions before starting work.
Please leave this leaflet with the user following installation
PACK CONTENTS
Heater, Pressure relief valve, Fixing screws and plugs,
Installation and user instructions.
WARNING
This water heater must only be installed by qualified persons.
36005801 Issue 2
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Please read and understand these instructions prior to installing your Sector 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 customer and these instructions left with them for
future reference.
TECHNICAL SPECIFICATION
Electrical rating .................................................... 2.0kW @ 230V
............................................................................. 2.2kW @ 240V
Capacities ............................................................. 10 or 15 litres
Weight (full) ......................................................... 10 litre - 15.9 kg
............................................................................. 15 litre - 23.1 kg
Rated pressure ..................................................... 6 bar (0.6 MPa)
Minimum recommended supply pressure ............ 0.8 bar (0.08 MPa)
Pressure Relief Valve ............................................ 6 bar (0.6 MPa)
1.0 IMPORTANT INSTALLATION POINTS
1.1 This unvented water heater MUST be fitted with the Pressure (Expansion) Relief
Valve supplied. This MUST be fitted to the cold water supply near the heater.
FAILURE TO PROVIDE ADEQUATE PRESSURE RELIEF WILL INVALIDATE
ANY GUARANTEE AND LEAD TO A DANGEROUS INSTALLATION
1.2 Expansion can take place within the cold water supply provided that both:
(a) Backflow in the main is not prevented by any stopvalve with loose jumper, check
valve, pressure reducing valve or similar.
(b) Hot water expansion does not enter a branch to a cold water outlet
(see Figure 1 for expansion pipe lengths).
N.B. Both of the above conditions must be met. Additionally, expansion within the
cold water supply will not be possible if the static supply pressure exceeds 4.1 bar
(60p.s.i.).
1.3 If any of the conditions in 1.2 cannot be met, expansion must be accomodated
using an Expansion Vessel. To ensure that all expansion takes place in the vessel a
Non Return Valve must also be fitted together with a Pressure (Expansion) Relief
Valve (see Figure 2). Use Accessory Pack SPACK ALK05.
1.4 If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve
must be fitted to the cold main supply. If a Pressure Reducing Valve is used an
Expansion Vessel must also be used. Use accessory pack SPACK ALK04
(see Figure 3).
1.5 Where specifications demand the fitting of a Temperature/Pressure Relief Valve, one
can be fitted on site (see Figure 4). Use Accessory Pack SPACK ALK06. Note the
fitting of SPACK ALK06 does not alter the requirements detailed in points
1.1 to 1.4.
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WARNING:
IF WATER FLOWS FROM THE PRESSURE RELIEF VALVE OR
TEMPERATURE / PRESSURE RELIEF VALVE (IF FITTED) THE ELECTRICITY
SUPPLY MUST BE SWITCHED OFF IMMEDIATELY AND PROFESSIONAL
ADVICE SOUGHT.
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HOT
COLD
NEAREST COLD
DRAW OFF
SERVICE
VALVE
COLD
WATER
MAINS
2.8 (10L) OR 4.2 (15L) METRES IS REQUIRED
FOR EXPANSION IN PIPEWORK.
NOTE: IF PRESSURE REDUCING VALVE
IS USED EXPANSION DOWN THE MAINS
IS NOT POSSIBLE
FIGURE 1 : FOR INLET WATER PRESSURES UP TO 4.1 BAR (60 P.
S.I.) - NO ADDITIONAL KITS USED.
COLD
EXPANSION
VESSEL
NON-RETURN
VALVE
NEAREST COLD
DRAW OFF
SERVICE
VALVE
COLD
WATER
MAINS
FIGURE 2 : FOR INLET WATER PRESSURES UP TO 4.1 BAR (60 P.S.I.)
WHERE EXPANSION IN MAIN SUPPLY IS NOT POSSIBLE - USING KIT SPACK ALK05
COLD
EXPANSION
VESSEL
NEAREST COLD
DRAW OFF
PRESSURE
REDUCING
VALVE
SERVICE
VALVE
COLD
WATER
MAINS
FIGURE 3 : FOR INLET WATER PRESSURES ABOVE 4.1 BAR (60 P.S.I.) - USING KIT SPACK ALK04
HOT
HOT
TO DRAIN
(WASTE)
PRESSURE
(EXPANSION)
RELIEF VALVE
TO DRAIN
(WASTE)
PRESSURE
(EXPANSION)
RELIEF VALVE
TO DRAIN
(WASTE)
PRESSURE
(EXPANSION)
RELIEF VALVE
S10UNV
OR
S15UNV
S10UNV
OR
S15UNV
S10UNV
OR
S15UNV
NON-RETURN
VALVE
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2. INSTALLATION - GENERAL REQUIREMENTS
2.1 National Wiring rules may contain restrictions concerning the installation of these
units in bathrooms.
2.2 The unit should be vertically wall mounted using the screws and plugs provided.
Position the bottom two screws as shown in Figure 5 with heads 3mm from the
wall. Hang the Heater and secure with the top screw.
Alternatively it can be floor mounted on its base. The water connections must
always be to the top of the unit.
2.3 Enough space should be left at the top above the unit for pipe connections and
access to the Temperature/Pressure Relief Valve if fitted. Refer to Figure 5 and the
Dimensions Table to determine a suitable position for the heater.
2.4 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.
2.5 DO NOT install where the unit may freeze.
2.6 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 1 to 3).
2.7 Both inlet and outlet pipes are clearly labelled. The pipes are 15mm copper tube
and are suitable for compression fittings.
It is recommended that a WRAS listed isolating valve (not supplied) is fitted on
the cold water supply to the heater. Several hot outlets can be served.
2.8 Do not use solder joints as this will damage the heater and may prevent servicing
under warranty.
2.9 Plumbers Paste must not be used as it can impair the operation of the valves.
HOT
T&P VALVE
COLD
TO DRAIN
(WASTE)
FIGURE 4: TEMPERATURE AND PRESSURE RELIEF VALVE.
NOTE: THE FITTING OF SPACK ALKO6 DOES NOT
ALTER THE REQUIREMENTS OF POINTS 1.1 TO 1.4
TO DRAIN
(WASTE)
CONNECTION TO
OUTLET PIPE OF
AQUAHEAT WATER
HEATER.
HOT WATER
OUTLET PIPEWORK
CONNECTION
DETAIL OF TEMPERATURE
AND PRESSURE RELIEF VALVE
PROBE
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3. INSTALLATION - ELECTRICAL REQUIREMENTS
WARNING: This appliance must be earthed. It is suitable for a.c. supply only.
Disconnect the electrical supply before removing the terminal cover.
Installation must be in accordance with the current I.E.E. Wiring Regulations.
3.1 The unit is supplied fitted with a 0.75m 3 core 1.5mm2 flexible cable. The electicity
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 the schematic wiring
diagram, Figure 6, on the next page.
3.2 The wires are colour coded as follows:
Green and Yellow EARTH ( )
Brown LIVE (L)
Blue NEUTRAL (N)
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E
G
I
H
F
A
B
C
D
2 KEYHOLE
FIXING SLOTS
6mm WIDE
FIGURE 5: DIMENSIONS
FIXING HOLE
DIMENSION 10 LITRE 15 LITRE
A 442mm 598mm
B 322mm 478mm
C 437mm 593mm
D 492mm 648mm
E 240mm 240mm
F 100mm 100mm
G 120mm 120mm
H 240mm 240mm
I 57mm 57mm
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4.0 INSTALLATION - DISCHARGE PIPE REQUIREMENTS
4.1 The discharge outlet from the Pressure (expansion) Relief Valve and the
Temperature/Pressure Relief Valve (if fitted) 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.
4.2 The discharge pipe must fall continuously from the valve outlets and be
unobstructed.
4.3 The pipe from the valves to the tundish should be 15mm o/d minimum. From the
tundish to the point of discharge the pipe should be 22mm o/d minimum and have a
resistance to flow equivalent to 9 metres of straight pipe. Long discharge pipe runs
should have an increased internal diameter.
4.4 The pipe material should be capable of conveying water/steam at 100oC.
4.5 The final discharge point should be in a safe, visible position.
5.0 COMMISSIONING
5.1 Do not switch on the electrical supply until the unit has been filled with water and
checked for leaks.
5.2 Check that all installation, electrical and discharge pipe requirements have been met.
ELEMENTNEON
RESET BUTTON
EARTH
POST
('STAT/CUT-OUT PLUGS DIRECTLY
ONTO ELEMENT TERMINATIONS).
DOUBLE POLE
ISOLATING SWITCH
BROWN
BLUE
GREEN/YELLOW
MAINS
SUPPLY
L
N
FIGURE 6: WIRING DIAGRAM 'AC' ONLY.
IMPORTANT: THE COMBINED THERMOSTAT/CUT-OUT MUST BE PUSHED FULLY
HOME TO ENSURE CORRECT OPERATION OF THE CUT-OUT
COMBINED
THERMOSTAT
& CUT-OUT
THERMOSTAT
POCKET
ELEMENT
TERMINALS
FLARED END OF
THERMOSTAT
POCKET
CORRECT INCORRECT
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7. MAINTENANCE - DESCALING
Little maintenance is required, however in hard water areas the unit will require periodic
descaling to ensure efficient operation. To descale the unit:
7.1 Switch off and disconnect the electrical supply. Turn off the water supply to the
unit.
7.2 Open a hot tap to relieve any system pressure. Disconnect the plumbing
connections to the unit and remove the heater (note full weights of units). Empty
unit through the outlet connection.
7.3 Remove the terminal cover as described in Section 6.
7.4 Disconnect the electrical terminations to the thermostat. Disconnect earth links to
the earthing stud.
7.5 Remove the element plate assembly by unscrewing the five 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.
7.6 Re-fit the element plate assembly using a new sealing gasket. Note the correct
orientation of the element plate by reference to Figure 7 overleaf. Rewire the unit
with reference to the Wiring Diagrams.
7.7 Re-commission the unit following the INSTALLATION and COMMISSIONING
instructions.
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5.3 Check that all water and electrical connections are tight.
5.4 Open a hot water tap, turn on mains water supply to the heater.
5.5 Allow unit to fill and leave hot tap running for a short while to purge any air and
flush out the pipework. Close the hot tap and check the system for leaks.
5.6 Manually test the operation of the Pressure (expansion) Relief Valve and, if fitted,
the Temperature/Pressure Relief Valve. Ensure water flows freely from the valve(s)
and through the discharge pipes.
5.7 Switch on the electrical supply.
5.8 The set temperature can be adjusted by rotating the shaft located on the Combined
Thermostat and Thermal Cut-out, clockwise increase the temperature. Access to
adjust the temperature is gained by removing the terminal cover.
6. REMOVAL AND FITTING OF TERMINAL COVER
6.1 To remove the terminal cover use a large flat bladed screwdriver to relieve the
snaps located towards the front, at either side, of the cover. Gripping the cover at
the front, pull upwards.
6.2 To fit the cover, locate the hinge at the back. Slide the snaps into place. Apply
pressure to the front of the cover pushing back and down until it snaps securely
in place.
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8. MAINTENANCE - SAFETY VALVES
The Pressure (expansion) Relief Valve and, if fitted, the Temperature/Pressure Relief
Valve should be regularly checked. Manually operate the valves by either twisting the
cap or lifting the lever. Ensure water flows freely from the valve(s) and through the
discharge pipes. Ensure the valve(s) reseat correctly when released.
9. MAINTENANCE - EXPANSION VESSEL PRECHARGE
PRESSURE
The Expansion Vessel, if fitted, 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:
9.1 Turn off water supply to the unit; open a hot tap to relieve system pressure.
9.2 Remove dust cap from top of Expansion Vessel
9.3 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.
9.4 Re-check pressure and when correct replace dust cap.
9.5 Turn on mains water supply and close hot tap.
INLET
OUTLET
CABLE CLAMP
EARTH POST
COMBINED THERMOSTAT
AND THERMAL CUT -OUT
FIGURE 7: CORRECT ORIENTATION OF ELEMENT PLATE ( VIEWED FROM TOP OF UNIT ).
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10. SPARE PARTS
The following comprehensive list of spare parts is available for your Sector 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
MANUFACTURER - THIS WILL INVALIDATE YOUR GUARANTEE AND MAY
RENDER THE INSTALLATION DANGEROUS.
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 ................. 95 612 687
Element plate gasket ............................................ 95 611 708
Pressure (expansion) Relief Valve ........................ 95 607 986
Temperature/Pressure Relief Valve ....................... 95 607 854
Top cover moulding ............................................. 95 614 272
Terminal cover ...................................................... 95 614 274
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11. FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is recommended
that any service operations on this Sector heater are carried out by a qualified engineer.
NOTE: Use only Sector approved spare parts. Replacement of any parts with
components not recommended by Sector will invalidate the guarantee and may render
the installation dangerous.
ACTIONPOSSIBLE CAUSESFAULT
1. Check electrical supply1. Electrical supply faultWater not heating
2. Check cut-out, if operated reset and
check thermostat operation. If necessary
replace thermostat/thermal cut-out
(see Wiring Diagram)
2. Thermal cut-out tripped
3. Check thermostat operation, replace if
necessary
3. Thermostat fault
Fit Pressure Reducing Valve Pack
SPACK ALK04 (see section 1.0)
pressure
Excessive mains water
pressure
(continuously)
Pressure Relief Valve
Discharge of water from
possible
(intermittently)
Presure Relief Valve
Discharge of water from
1. Fit pack SPACK ALK05
(see section 1.0)
2. Fit pack SPACK ALKO4
(see section 1.0)
3. Replace Pressure Relief Valve.
4. Check and if necessary, re-charge
Expansion Vessel pre-charge pressure
(see Section 9.0)
1. Expansion in mains not
possible.
2. Mains pressure exceeds
4.1 bar (60 p.s.i.)
3. Pressure Relief Valve Fault
4. Loss of pressure from
Expansion Vessel
Thermostat and
thermal cut-out fault
Replace thermostat and thermal cut-out
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Discharge of water from
1. Check all valves are correctly installed
in accordance with flow direction arrows
1. Inlet valves incorrectly
fitted
No water flow
2. Check mains water supply is on
2. Mains water supply not
turned on
3. Check for obstructions. If pack
SPACK ALKO4 is fitted check strainer
is not blocked.
3. Blockage in mains water
supply
Water from a pressurised system releases
oxygen bubbles when flowing. The
milkiness will disappear after a short
time.
Oxygenated water
"Milky" water
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12. 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 SPACK ALK03 is recommended. Follow the installation instructions supplied
with the valve for connection to the system.
13. USER INSTRUCTIONS
13.1 This Sector unvented water heater stores water at the temperature set on the
adjustable thermostat. This can be set to give temperatures in the range of 10 to
70o C. To avoid any 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.
13.2 To ensure the heater continues to operate at its optimum performance it should
be periodically maintained in accordance with the instructions given under the
Sections headed MAINTENANCE.
13.3 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 a qualified installer. Do not turn the electrical
supply on again until the unit has been checked and approved by a qualified
installer.
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14. 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 fitted correctly.
2. Any valves and controls are of the Sector recommended type and specification.
3. The unit has not been modified 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 Sector is one of continuous product development and, as such, we reserve
the right to change specifications without notice.
Hurricane Way, Norwich, Norfolk, NR6 6EA.
For help with fitting and using your Sector water heater please call:
01603 420347 (fax 01603 420349).
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