Heatrae Sadia UTC 15 Guide

UTC 15
1
Installation and User Instructions
for the
UTC
Undersink Vented Water Heater
HEAHEA
HEAHEA
HEATRAE SADIATRAE SADIA
TRAE SADIATRAE SADIA
TRAE SADIA
The quality name in water heating
Please read and understand these instructions before starting
work.
Please leave this leaflet with the user following installation
36 00 5721 Issue 1

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Please read and understand these instructions prior to installing your UTC 15 vented
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 SPECIFICATIONS
Electrical rating ................................................... 1.38/1.5kW 230/240V
or ....................................................................... 2.75/3.0kW 230/240V
Capacities ............................................................ 15 litres
Weight (full) ........................................................ 23.4kg
Rated pressure (Open Outlet) .............................. 0 bar
Rated pressure (Max. head pressure Cistern Fed)
............................................................................. 2 bar (20 metres)
Minimum recommended supply pressure ........... 0.4 bar (4 metres)
1.0 IMPORTANT INSTALLATION POINTS
1.1 The UTC 15 vented water heater is designed to be fitted under a sink or worktop.
1.2 The UTC 15 can be installed either as an Open Outlet or Cistern Fed type unit
when used with the appropriate fittings.
1.3 DO NOT connect directly to the mains water supply.
1.4 OPEN OUTLET INSTALLATION
When installed as an Open Outlet water heater the outlet acts as a vent and
must not be connected to any form of tap or fitting not recommended by
Heatrae Sadia.
Only one outlet can be served via an Open Outlet type tapset.
1.5 CISTERN FED INSTALLATION
When installed as a Cistern Fed water heater the cold water supply must be
from a feed cistern complying with Water Byelaw 30.
A vent pipe must be connected to the outlet of the heater. The vent pipe must
rise continuosly and be arranged to discharge into the cold water feed
cistern.
The vent pipe must have a minimum bore of 19mm.

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2.0 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 wall bracket
provided. 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. Refer to Diagram 1 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 The unit should be fixed to the wall using No. 12 screws into
suitable wall plugs.
2.6 DO NOT install where the unit may freeze.
2.7 Refer to the section IMPORTANT INSTALLATION POINTS to
determine which valves and accessories are required.
2.8 The water connections are 15mm diameter copper tubes suitable for
compression fittings. Do not use solder joints as this will damage
the heater.
2.9 The INLET is marked BLUE, the OUTLET is marked RED. It is
recommended that a WBS Listed isolating valve be fitted on the
cold water supply to the heater.
Diagram 1 Dimensions

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3.0 INSTALLATION - OPEN OUTLET
3.1 When installed as an Open Outlet water heater the outlet acts as a vent and
must not be connected to any form of tap or fitting not recomended by
Heatrae Sadia.
3.2 Only one outlet can be served via an Open Outlet type tapset. A range of Open
Outlet (Vented) taps is available from Heatrae Sadia. All tapsets are of high
quality chromium plated brass construction.
PACK J 95 970 295 Two hole mixer set
PACK K 95 970 296 Monobloc mixer tap
PACK M 95 970 298 Pair of pillar taps with 1/4 turn elbow levers
PACK P 95 970 299 Pair of basin taps with 1/4 turn elbow levers
PACK Q 95 970 310 Two hole mixer set with 1/4 turn elbow levers
PACK R 95 970 311 Pair of pillar taps
PACK S 95 970 312 Basin hot tap
PACK T 95 970 313 Basin cold tap (matches Pack S)
3.3 The cold water supply may be taken from the cold water mains or from a cold
water feed cistern complying with Water Byelaw 30 with a minimum recom-
mended pressure of 0.4 bar (4 metres).
3.4 The inlet and outlet connections of the heater must be connected to the Open
Outlet tapset in accordance with the Fitting Instructions supplied with the tapset.
The inlet must not be connected directly to the cold water mains supply.
3.5 In an Open Outlet installation it is normal for the tap to drip during heating. This
is due to expansion of water as it is heated within the unit, it does not indicate a
fault. DO NOT attempt to stop this dripping by over-tightening the tap as
damage to the sealing washers or internal operating mechanism will occur.
Diagram 2 Typical Open Outlet Installation

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4.0 INSTALLATION - CISTERN FED
4.1 This method of installation must be used if the outlet is to be
connected to one or more conventional taps. It is not recommended
for supplying a shower. Individual site demands should be consid-
ered when choosing the number of outlets to be served.
4.2 A vent pipe must be connected to the outlet connection of the
heater.
The vent pipe must have a minimum internal diameter of 19mm.
The vent pipe must be unobstructed, rise continuosly and be
arranged to discharge into the cold water feed cistern.
DO NOT connect any pressure relief device to the vent pipe of
this water heater.
4.3 The cold water supply must be from a cold water feed cistern
complying with Water Byelaw 30. The maximum head pressure
must not exceed 20 metres.
4.4 It is recommended that a WBS Listed isolating valve is fitted on the
cold water supply to the heater.
4.5 The inlet must not be connected directly to the cold water mains
supply.
Diagram 3 Typical Cistern Fed
Installation

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5.0 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.
5.1 The unit is supplied fitted with a 0.75m 3 core 1.5mm2flexible cable. The
electicity supply should be fused 13 Amp for a 3kW model and 10 Amp for a
1.5kW model 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 below.
5.2 The wires are colour coded as follows:
Green and Yellow EARTH ( )
Brown LIVE (L)
Blue NEUTRAL (N)
Wiring Diagram
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 and electrical requirements have been met.
5.3 Check that all water and electrical connections are tight.
5.4 Open a hot water tap, turn on cold 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.
5.7 Switch on the electrical supply. The indicator light will illuminate during
heating. When the set temperature is reached the indicator light will go out.
5.8 The set temperature can be adjusted by rotating the knob located in the terminal
cover. It is possible to lock the thermostat knob in either the mid-range or a “hot”
position by following the procedures in 5.9 or 5.10 below. Always switch off the
electrical supply before removing the terminal cover.

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6.0 MAINTENANCE
Little maintenance is required, however in hard water areas the unit will
require periodic descaling to ensure efficient operation. To descale the
unit:
6.1 Switch off and disconnect the electrical supply. Turn off the water
supply to the unit.
6.2 Open a hot tap to relieve any system pressure. Disconnect the
plumbing connections to the unit and remove from the wall bracket
(note full weights of units). Empty unit through the outlet connec-
tion.
6.3 Remove the terminal cover by using a large flat bladed screwdriver
to depress the 3 snap lugs located in the top 3 rectangular depres-
sions.
6.4 Remove the plastic disc from the thermostat spindle. Remove the
insulating pad from the terminal housing. Disconnect the electrical
terminations to the thermostat. Disconnect earth links to the
earthing stud.
6.5 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.
5.9 Setting the “mid-range” position:
Rotate the thermosatat knob to the mid postion. Remove the termi-
nal cover by using a large flat bladed screwdriver to depress the
three snap lugs located in the three top rectangular depressions.
Holding the thermostat knob in position turn the terminal cover
over and remove the backing disc from the underside of the cover.
Turn the backing disc over and refit to the knob ensuring the notch
locates with the boss on the underside of the cover. Refit the
terminal cover, the thermostat will now be locked in the “mid-
range” position.
5.10 Setting the “hot” position:
Rotate the thermostat knob to mid way through the hot graduated
range (red graphic). Follow the procedure detailed above, however
in this case the knob should be held in the “hot” position previously
set. When the terminal cover has been refitted the thermostat will be
locked in the “hot” position.

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6.6 Re-assemble the element plate assembly fitting a new sealing gasket. Note the
correct orientation of the element plate by reference to Diagram 4 below. Rewire
the unit with reference to the Wiring Diagram. Refit the insulating pad and
plastic disc to ensure the correct operation of the thermostat.
6.7 Re-commission the unit following the INSTALLATION and COMMISSIONING
instructions.
9.0 SPARE PARTS
The following comprehensive list of spare parts is available for your UTC 15 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 HEATRAE
SADIA - THIS WILL INVALIDATE YOUR GUARANTEE AND MAY
RENDER THE INSTALLATION DANGEROUS.
DESCRIPTION CODE NO.
Element plate assembly - 3kW ............................ 95 606 922
Element plate assembly - 1.5kW......................... 95 606 927
Combined thermostat/thermal cut-out ................ 95 980 041
Indicator light ...................................................... 95 607 992
Element plate gasket ........................................... 95 611 811
Top cover moulding............................................. 95 614 246
Terminal cover c/w thermostat knob .................. 95 614 182
Diagram 4 Correct orientation of element plate (viewed from top of unit)

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10.0 FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It
is recommended that any service operations on the UTC 15 heater are
carried out by a competent person.
NOTE: Use only Heatrae Sadia approved spare parts. Replacement of
any parts with components not recommended by Heatrae Sadia will
invalidate the guarantee and may render the installation dangerous.
ACTIONPOSSIBLE CAUSESFAULT
1. Check electrical supply1. Electrical supply faultWater not heating
h/hl
necessary replace
thermostat operation. If
operated reset and check
2. Check cut-out, if2. Thermal cut-out tripped
necessary
operation, replace if
3. Check thermostat3. Thermos tat fault
replace.
resistance. If faulty
continuity and insulation
4. Check element for circuit4. Element fault
supply is on.
1. Check mains water
turned on
1. Cold water supply not
N
o water flow - Genera
l
2. Check for obstructions .
supply
2. Blockage in cold water
connections to tapset
1. Check water
correctly installed
1. Open Outlet tapset not
Outlet installations
N
o water flow - Open
2. Check for obstructions .2. Blockage in tapset
1. Check for obstructions .1. Blockage in tapset
Fed ins tallations
N
o water flow - Cistern
float valve.
Check operation of cistern
cistern tank is turned on.
2. Check water supply to2. Cistern tank empty
float valve.
Check operation of cistern
equal to outlet flow rate.
and that inlet flow rate is
cistern tank is turned on
1. Check water supply to
as outlet flow rate
1. Cistern not filling as fast
ins tallation s
reduces - Cistern Fed
Water flow gradually
necessary.
obstructions, clear as
2. Check vent pipe for2. Vent pipe blockage

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12.0 USER INSTRUCTIONS
12.1 The UTC 15 vented heater stores water at the temperature set on the adjustable
thermostat. This can be set to give temperatures in the range of 10 to 70oC. 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.
12.2 The thermostat can also be locked in either the mid range or a “hot” position.
To lock the thermostat position the instructions given under Sections 5.9 and
5.10 should be followed. We recommend that this procedure is carried out by a
qualified electrician.
12.3 The indicator light will be illuminated when the unit is heating.
12.4 To ensure the heater continues to operate at its optimum performance it should
be periodically maintained in accordance with the instructions given under the
Section headed MAINTENANCE.
12.5 IMPORTANT NOTES TO USER
OPEN OUTLET INSTALLATIONS
When installed as an Open Outlet water heater the outlet acts as a vent and
must not be connected to any form of tap or fitting not recommended by
Heatrae Sadia. The outlet of the tap must not be restricted or blocked in
any way.
In an Open Outlet installation it is normal for the hot outlet tap to drip
during heating. This is due to the expansion of water as it is heated within
the unit, it does not indicate a fault with the unit. DO NOT attempt to stop
this dripping by over-tightening the tap as damage to the sealing washers or
the operating mechanism will occur.

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GUARANTEE
This water heater is guaranteed for a period of two years from the date
of purchase provided:
1. The unit has been installed in accordance with these instructions
and all necessary controls and valves have been fitted correctly.
2. Any valves or controls are of Heatrae Sadia recommended type.
3. The unit has not been tampered with and has been regularly main-
tained as detailed in these instructions.
4. The unit has been used only for heating potable water.
The unit is not guaranteed against damage by frost or due to the build
up of scale.
This guarantee does not affect the statutory rights of the consumer.
ENVIRONMENTAL INFORMATION
This product is manufactured from many recyclable materials. At the
end of its useful life it should be disposed of at a Local Authority
Recycling Centre to realise the full environmental benefits.

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HEATRAE SADIA HEATING LIMITED
Hurricane Way
Norwich
NR6 6EA
Tel: [phone] General
[phone] Service
Fax: [phone]
HEAHEA
HEAHEA
HEATRAE SADIATRAE SADIA
TRAE SADIATRAE SADIA
TRAE SADIA
The quality name in water heating