Lefroy Brooks CT 8700, MK 8700 Installation Manual

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Page 1

CT 8700 / MK 8700

EXPOSED THERMOSTATIC SHOWER VALVE

WITH CERAMIC LEVER

INSTALLATION GUIDE

Page 2

MADE IN

50mm

105mm

33mm

107mm

Ø90mm

15mm Copper

153mm (Connaught – CT)

148mm (Mackintosh – MK)

COLDHOT

200mm

G¾

DIMENSIONS

Not to scale

Shown with CT8700

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200mm

1035mm

maximum

200mm

585mm

1085mm

maximum

CT/MK 8702

CT/MK 8720

CT/MK 8703

CT/MK 8705

All dimensions are taken from centres

HOTCOLD

HOT COLD

200mm

(Note: On 8720 the hot is on the right and cold on the left)

HOT COLD

TYPICAL SHOWER SETS

Not to scale

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EXPLODED VIEW

PTE005 –

Valve backplate

Flow supressor (white)

See ‘balancing ﬂow’ in ‘important

information’ section

PTS002 –

Non-return

valves (pair)

PTS024 – Override

including screw

PTS026 – (CT)

Handwheel

with lion indice

PPW005 – Lion indice

only

PTS011 – Ceramic

ring only

PTS030 – Screw

PTE018 – (CT)

Thermostatic

cartridge cover

PTE020 – (MK)

Thermostatic

cartridge cover

PTS025 – (MK)

Handwheel

PTS020 – Lock washer

PTS022 – Temperature stop

LB2750 – Thermostatic cartridge

PTS021 – Lock nut

PTS007 – Screw

PTS004 – White lever (UPPER ceramic only) PTE016 – Black lever (ceramic only)

PTE002 – Flow cartridge

PTE003 – Flow control

cover

PTE007 – Pair of 15mm crack cover plates PTE040 – A single 15mm crack cover plate

PTE006 – Pair of 15mm inlet connection elbows with compression nuts, olives and ﬁbre washers PTE041 – A single 15mm inlet connection elbow with compression nut, olive and ﬁbre washer

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20 30

3.0

2.0

1.0

Flow (Litres/minute)

Static Pressure (Bar)

TYPICAL FLOW RATES

Note: Balanced pressures shown are applied directly to the hot and cold inlets; ﬂow rates indicated are free ﬂowing and may var y subject to restrictions created by installation, pipework, layout or application. The outlet temperature during testing was 38°C.

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IMPORTANT INFORMATION

Professional installation

We recommend that our products are ﬁtted by a fully qualiﬁed professional plumber. They should be installed correctly and in accordance with all local water regulations. All products and connections should be accessible for routine servicing.

Suits all systems

This Lefroy Brooks product is potentially suitable for every possible application, type of boiler and water supply pressure. However, for full ‘power’ shower performance it is advisable to ﬁt a water pump if the supply pressure is below 1 bar. For systems with combination boilers, it is not advisable to ﬁt pumps (refer to boiler manufacturer).

Recommended supply temperatures

HOT = 60/65°C COLD = 10/15°C

Water quality

In hard water areas, a suitable water treatment system should be provided to prevent limescale deposits (calcium deposits) which may eect the long term performance of the thermostatic cartridge and ceramic cartridge. Exterior surfaces should be gently wiped with a dry soft cloth after use to minimise water stains and limescale deposits.

Servicing

All serviceable parts are available to maintain your Lefroy Brooks product. We recommend periodic servicing to help maintain the best performance from your shower (‘servicing the thermostatic cartridge’, ‘replacing the ﬂow cartridge’ & ‘replacing the non-return valve’ sections). Time between servicing can vary as it is subject to usage and water quality. Servicing kits are available (reference code PTE021) or refer to exploded view for individual items.

Flushing system

It is most important to ﬂush out all pipework thoroughly before connecting the product. This is the single most common cause of ceramic cartridge and thermostatic cartridge failure.

Supply connections

The hot water supply must be connected to the left inlet elbow and cold water supply to the right inlet elbow, as viewed from the front. If the thermostatic valve is ﬁtted with the ﬂow valve at the bottom the hot water supply must be connected to the right inlet elbow and the cold water supply to the left inlet elbow.

Balancing ﬂow

If there is a signiﬁcant dierence in water pressures between hot & cold supplies, we recommend an in-line ﬂow suppressor/ regulator (supplied) be ﬁtted.

Safety/Anti-scald

This thermostatic valve not only maintains a constant temperature to approximately plus or minus 1°C, but will automatically shut down completely on failure of hot or cold supplies.

Temperature setting

Once the installation has been completed the ‘safe temperature’ must be checked and set in accordance with the setting instructions (see following ‘setting safe temperature’ & ‘ﬁtting the temperature override’ sections). The valve is factory set but the working temperature may dier subject to the hot & cold water temperatures being supplied to the valve.

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Fixing the valve backplate to a wall

When locating and securing the valve backplate (see exploded view) to a wall, it is important to use No. 8 screws. Before marking mounting hole locations, ensure that one of the set screws mounted in the valve backplate is at the bottom.

Non-return valves

To protect your water system, non-return valves are ﬁtted inside the inlet elbows to the sides of the valve body. These can be removed and cleaned if required.

Testing

It is important to pressure check all connections. During manufacture the internal components and external joints of the valve are pressure tested to 5 bar. However, installation can aect the external joints. For this reason we recommend that all connections to and from the valve are pressure tested.

Access

It is important to leave suitable clearance and access to the valve and connections for future servicing.

Setting the ‘safe temperature’

To avoid damage, when setting the ‘safe temperature’ the thermostatic cartridge spindle must be turned by hand only. The spindle will require only minor adjustment. Turning the

spindle to the end of its travel and forcing it beyond this point will cause internal damage to the thermostatic cartridge.

Always ﬁt the black plastic ‘temperature stop’ before ﬁtting the ‘override’. One of the functions of the temperature stop is to prevent the thermostatic cartridge spindle being turned beyond the end of its travel. Not ﬁtting the

temperature stop will result in damage to the thermostatic cartridge.

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SETTING ‘SAFE TEMPERATURE’

Recommended safe temperature settings:

General domestic: 38 °C Young children or elderly: 37 °C

For speciﬁc details please refer to local building regulations, current legislation,

relevant standards and codes of practice.

This valve is designed to be set at the required safe operating temperature, but is ﬁtted with an override

button which allows the user to select higher temperatures if required. The override control is to be

returned to the ‘safe temperature’ setting after use.

Remove the thermostatic control handwheel (A) by unscrewing set screw (B) using a 1.5mm hexagonal key.

Remove the override (C) and temperature stop (D) by unscrewing and removing screw (E). Fitting handwheel (A) and set screw (B) will aid with removal of override (C).

Adjust the car tridge spline whilst measuring the temperature of the water. Ideally the temperature measurement should be taken using a digital thermometer.

Duty of care

Legislation dictates recommendations and guidelines on health and safety, including safe hot water

temperatures. The emphasis is on regulatory and design criteria, with responsibility for meeting such

guidelines being that of a suitably appointed responsible person.

How hot water temperatures aect the skin

65°C A partial thickness burn in about 2 seconds 60°C A partial thickness burn in about 5 seconds

55°C A partial thickness burn in about 15 seconds

50°C A partial thickness burn in about 90 seconds

Safe temperature

The age, mental and physical capabilities of persons occupying the proper ty will eect the ‘safe temperature’ setting of the thermostatic valve. For speciﬁc details please refer to local building

regulations, current legislation, relevant standards and codes of practice.

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Button position

Set horizontal –

or slightly lower

Minimum

temperature

Maximum

temperature

Safe temperature

(see ‘setting safe

temperature’ section)

(button alignment)

Safe temperature locator

Safe temperature position

Temperature stop (D) orientation

Once the safe operating temperature has been set, the next stage is to correctly assemble the

temperature stop (D) & override (C). The temperature stop and ‘safe temperature’ button can be

positioned to customer requirements. The below setting is suitable for right handed operation.

Three typical settings are shown on the next page.

FITTING THE ‘TEMPERATURE OVERRIDE’

1 Locate the temperature stop (D) onto the

cartridge spline with the ‘safe temperature’ locator in a horizontal or slightly lower position. This is dependent on the orientation of the splines (as shown above). Do not set higher as this will eect the position of the button on the override (C). Once located in a suitable position push the temperature stop in fully.

2 Locate the override (C) with the button

positioned horizontally and to the left. Slide the override carefully onto the smaller cartridge spline. There may be a small amount of rotation required to align the override mechanism with the safe temperature position.

Note: The button may not be per fectly horizontal depending on the orientation of the cartridge splines.

3 Secure with screw (E). It is impor tant to check

the water temperature.

4 Fit the temperature control handwheel (A) then

tighten set screw (B) using a 1.5mm hexagonal key to secure.

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MADE IN

Safe temperature

(see ‘setting safe

temperature’ section)

Temperature stop positionButton position

Set vertically –

or slightly

counter clockwise

Minimum

temperature

Maximum

temperature

Set horizontal – or slightly lower

Minimum

temperature

Maximum

temperature

Set horizontal –

or slightly

higher

Minimum

temperature

Maximum

temperature

(button alignment)

Safe temperature button set to top

(suitable for right and left handed operation)

Safe temperature button set to left

(suitable for right handed operation)

Safe temperature button set to right

(suitable for left handed operation)

Safe temperature

(see ‘setting safe

temperature’ section)

Safe temperature

(see ‘setting safe

temperature’ section)

The temperature stop and safe temperature button can be positioned to customer requirements

as below:

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3 To remove the thermostatic cartridge cover

(F) unscrew the set screw (G) using a 1.5mm hexagonal key and pull the thermostatic cartridge cover away from the valve body.

4 To remove the thermostatic cartridge

(H), unscrew and remove locking nut (J). Remove anti-rotation washer (K) and pull out cartridge. To help with cartridge removal, it is recommended you ﬁt override (C) with screw (E) to make pulling the cartridge out easier.

1 Isolate the hot and cold water supplies before

the shower valve. Remove the thermostatic control handwheel (A) by unscrewing set screw (B) using a 1.5mm hexagonal key.

2 Remove the override (C) and temperature

stop (D) by unscrewing and removing screw (E). Fitting handwheel (A) and set screw (B) will aid with removal of override (C).

SERVICING THE THERMOSTATIC CARTRIDGE

If after a period of time you experience temperature problems with your shower valve,

particularly if you are in a hard water area, it is quite common for limescale deposits to have formed in the thermostatic cartridge. We recommend you remove the car tridge and soak it in a descaling ﬂuid which normally resolves the problem. It is dicult to set a regular servicing time scale as it is subject to

water conditions and usage.

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5 Check the ‘o’ rings (L) for damage (ie. cuts or tears). Remove the ‘o’ rings before soaking the cartridge

in descaling ﬂuid. Soak the car tridge according to the instructions on the descaling ﬂuid packaging. Rinse under cold water before ﬁtting (refer to the ‘installing the thermostatic cartridge’ section to install).

INSTALLING THERMOSTATIC CARTRIDGE

Important note:

For an approximately 38 °C setting, align the ‘key setting points’ shown. Once assembled, reset the safe temperature by following the setting instruction in the ‘setting safe temperature’ section. Check the water temperature with a thermometer.

1 Once the ‘key setting points’ have been

aligned and ‘o’ rings (L) ﬁtted, apply a smear of silicon grease to the ‘o’ rings and ﬁrmly push the thermostatic cartridge (LB2750) into the valve body with the groove pointing upwards.

2 Insert the anti-rotation washer (K) so it

locates to the ‘ﬂats’ on the cartridge and ﬁts into the ‘notch’ cut into the valve body.

3 Screw in locking nut (J) and fully tighten using a

32mm a/f spanner to secure the thermostatic cartridge in place.

Groove

Black line or drilled indication hole

LB2750

Slot

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If after a period of time you experience problems with your shower or hand shower developing a regular

drip after use, it is normally an indication that the ﬂow cartridge requires replacement.

REPLACING THE FLOW CARTRIDGE

(PTE002)

1 Remove the lever assembly (M) by fully

unscrewing and removing the fulcrum screw (N) in a counterclockwise direction. Gently pull the lever from the cartridge spline.

2 Remove the cartridge cover (P) by unscrewing

set screw (Q) using a 1.5mm hexagonal key. We recommend wearing a rubber glove such as those used for washing up to improve grip.

3 Using a 17mm spanner or socket, unscrew

the ﬂow cartridge (R) (counterclockwise) and remove. The replacement cartridge code is PTE002.

4 After installing the replacement ﬂow cartridge,

ﬁt the cartridge cover and lever in reverse order.

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Non-return valve (NRV)

1 Isolate the hot and cold water supplies before

the shower valve. Unscrew and remove the hose/pipe connected to the ﬂow valve outlet. Unscrew the three set screws from the valve backplate.

2 Support the thermostatic valve. Unscrew

the two collar nuts in a counterclockwise direction. This will release the thermostatic valve from the mounting surface.

3 Unscrew the elbow assemblies from the sides

of the thermostatic valve body.

4 Place a ﬁnger into the end of the non-return

valve and pull the non-return valve out of the va lve b ody.

5 Assemble in reverse order using replacement

non-return valve(s).

REPLACING THE NON-RETURN VALVES

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DOs DON’ Ts

• Check all joints and connections.

• Ensure that the ‘safe temperature’ has been set.

• Ensure the black plastic ‘temperature stop’ has been ﬁtted to avoid damage to the thermostatic cartridge and enable the ‘safe temperature’ to be operational.

• Ensure that the thermostatic valve, connected controls and outlets work satisfactory.

• Instruct the customer how to override the ‘safe temperature’ setting. Also ensure the customer knows the dangers of overriding the setting and understands that the override control is to be returned to the ‘safe temperature’ setting after use.

• Hand these instructions along with the cleaning leaﬂet to the customer.

• Ensure that the valve is suitably protected from damage and decorating materials during installation.

• Do not use excessive force when turning the thermostatic cartridge spindle. This will damage the cartridge. To avoid damage, when setting the ‘safe temperature’ the thermostatic cartridge spindle must be turned by hand only. The spindle will require only minor adjustment.

Turning the spindle to the end of its travel and forcing it beyond this point will cause internal damage to the thermostatic cartridge.

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Whilst every effor t is made to ensure the accuracy of these, they are subject to change without

notice as part of the company’s product developme nt process. The use of trademarks, product design

and art work is subject to licence or agreement with LBIP Ltd. The design registrations, trademark registr ations

and copyrights are protected by law and t he use or reproduction outside the terms of an agreeme nt is prohibited.

The right to modify designs and dimensions is reserved. LBIP Ltd is a member of ACID (Anti Copying in Design).

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+44 (0)1992 708 316

LEFROYBROOKS.CO.UK

20.065.272A / JUNE 2017