Warmup MD-SML1, MD-MED1, MD-LRG1 Installation Instructions

Installation Manual

Mirror Demister

Technical Helpline

0345 345 2288

Bathroom

Heating

IMPORTANT!

Please read this manual before
attempting to install your Warmup
product. Complete and submit your
warranty form online at

www.warmup.co.uk

1

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2

Contents

Components Required for Installation ..................................... 4

Do’s & Don’ts ............................................................................ 5

Step 1 - Electrical Supply ........................................................ 6

Step 2 - Layout Planning ........................................................ 7

Step 3 - Apply Mirror Demister ................................................ 8

Step 4 - Make Electrical Connection ....................................... 9

Step 5 - Mount the Mirror .....................................................11

Troubleshooting ..................................................................... 12

Performance Troubleshooting ............................................... 13

How to test the Mirror Demister ............................................. 14

Warranty ................................................................................. 15

Control Card ........................................................................... 16

Layout Plan ............................................................................ 17

Technical Specifications ........................................................ 18

WARNING

Your Warmup® Mirror Demister has been designed so that installation

is quick and straight forward, but as with all electrical systems,

certain procedures must be strictly followed. Warmup plc, accepts no

liability, expressed or implied, for any loss or consequential damage

suered as a result of installations which in any way contravene the

instructions that follow.

It is important that before, during and aer installation that all

requirements are met and understood. If the instructions are

followed, you should have no problems. If you require help at any

stage, please contact our helpline.

You may also find a copy of this manual and other helpful information

on our website:

www.warmup.co.uk

3

Components Required
for Installation

Components available from Warmup

Warmup Mirror Demister

Additional components needed as part of your Warmup heating
installation:

30 mA Residual Current Device (RCD), required as part of all
installations.

Digital Multi-meter required for testing the resistance of the
mirror demister.

Electrical tape.

Electrical housing, back boxes and junction boxes.

Scissors.

Silicone.

4

Do’s & Don’ts

DO

Install the Warmup Mirror Demister in line with these
instructions. The demister is designed to warm bathroom
mirrors only.

Ensure that the control card at the back of the manual is
completed and fixed at the consumer unit as per the current
edition of BS 7671.

Adhere the demister to the mirror only, not to the wall.

Remove any air pockets when you are installing the demister
onto the back of the mirror.

Ensure there is a minimum 10 mm gap between the demister
edge and fixing points or the mirror edge.

Allow a 2 mm gap between the mirror and any hard surfaces
to allow for mirror expansion and contraction when heating.

Ensure any metal parts which are accessible and are in
contact with the mirror are earthed/grounded in compliance
with BS 7671.

Ensure the mirror being used is suitable for use with the
Warmup Demister. Contact mirror manufacturer for guidance.

Ensure that the edges of the demisters are at are at least
5 mm apart.

DON’T

Cut or puncture the demister at any time.

Use a demister that is too large for the mirror being heated.

Connect two demisters in series, only connect demisters in
parallel.

Attempt a DIY repair if you damage the demister, it must be
replaced.

DO NOT overlap demisters if two or more are installed.

Pull on the power supply cable as it may cause damage to the
demister.

Use the demister on vanity cabinets as it will heat the
contents of the cabinet

.

5

Step 1 -

ZONE 0

ZONE 2

ZONE 1

ZON

E 2

Z
O
N
E

2

Z
O

N
E
2

ZO

N

E 0

Z

O

N

E

1

2.2

5

m

2.

2

5

m

0

.6

m

0

.6

m

0

.6

m

0

.

6m

0.

6

m

0.
6m

0

.

6m

Electrical Supply

Zone Chart

Install the RCD

Install a dedicated 30 mA RCD or use an existing RCD. No more than

7.5 kW of heating may be connected to each 30 milliamp RCD. For
larger loads, use multiple RCD’s.

NOTE: It is possible to run the demister(s) from a existing lighting
circuit protected by a 30 mA RCD. It should be calculated whether or
not the circuit can handle the additional load.

NOTE: In the case of bathroom installations, electrical regulations
prohibit the installation of Mains Voltage products such as
thermostats, contactors, fused spurs, isolators or junction boxes,
within Zones 0 or 1.

This mirror demister has an IP rating of IP65 and is suitable for
installation within Zone 2, Zone 3 or outside of any Zones.

All electrical connections must conform to the current BS 7671
Wiring Regulations. Final connections to the main electricity
supply MUST be completed by a Part P qualified electrician.

6

Step 2 -

Layout Planning

Before you begin

• Determine the location of the

mirror demister, marking its
intended position of the on
the wall.

• Also mark the demister power

cable position on the wall.

• If the mirror is mounted

within the plane of the tiles,
ensure that it is surrounded
with a minimum 3 mm bead
of silicone to allow for mirror
expansion and contraction
when heating.

• The demister must not be

cut, shortened, punctured or
creased, however the supply
cable may be shortened if
required.

• If the mirror is going to be

mounted within a rigid (metal/
wood/moulded resin) frame it
should be able to expand and
contract independently of the
frame.

NOTE: If using adhesive to
mount the mirror to the wall
ensure that it is suitable for use
with heated mirror demisters.
Please contact mirror adhesive
manufacturer for guidance.

• If fixing the mirror to the wall

using adhesive or screws
ensure flexible fittings are
used, either in the form of a
flexible mirror adhesive or
flexible bushings in the fixing
holes if screwed to the wall.

NOTE: Take care not to
screw through the demister
if mounting the mirror with
screws.

7

Step 3 -

Apply Mirror Demister

1 2

• Measure and record the

resistance of the demister
in the “Resistance Before”
column of the control card,
supplied as part of this
installation guide on Page 16.

• Stop installation immediately

and contact Warmup if its
resistance falls outside the
range set out in the Reference
Resistance Band table on
Page 18.

3

• Position the demister on

the back of your mirror so
that it matches the markings
previously made on the wall.

• Draw the outline of the

demister on the back of the
mirror.

• Always handle mirrors with

care. Lay the mirror face down
on a protective so surface.

• The back of the mirror must

be clean, dry and free from
grease, detergents or polish.

4

• Peel 50 mm o the protective

backing and position it so that
it lines up with your markings
on the mirror back.

• Press the demister into the

back of the mirror smoothing
out any air pockets between
the demister and mirror using
a so cloth or a sponge.

• Gradually remove the rest

of the protective backing
repeating the previous step,
removing any air pockets,
ensuring you keep the
demister in line with the
markings you made on the
back of the mirror.

8

Step 4 -
Make Electrical Connection

The Warmup Mirror Demisters electrical connection
must conform to the current BS 7671 Wiring Regulations.
Final connections to the main electricity supply MUST be
completed by a Part P qualified electrician.

1

• Channel out a recess in the

wall for the connector block
and power supply cable of the
demister. This location should
have been marked on the wall
in Step 2.

NOTE: If installing multiple heaters, they MUST be installed in
parallel, DO NOT connect in series. The power rating of the circuit
should also be checked to determine that the heaters will NOT
overload the circuit.

NOTE: Any metal parts which are accessible and are in contact with
the mirror must be earthed in compliance with BS 7671.

2

• The supply should be

on a circuit protected by
a maximum 5 amp fuse
or circuit breaker. It is
recommended that the mirror
demisters supply is fitted with
an in-line isolator to allow it
to be independently isolated.
Please see Page 6 for correct
zoning.

• The demister is a Class II

device and does not require
connection to earth.

9

Step 4 -

L

30 mA

RCD or

RCBO

N

Max. 5A

Fused Isolator

Switch

Mirror

Demister

L

30 mA

RCD or

RCBO

N

LNL

N

Controller

Mirror

Demister

Max. 5A

Fused Isolator

Switch

Make Electrical Connection

3A

• The Warmup Mirror Demister can be connected into the rooms

lighting circuit, enabling the demister when the lights are switched
on.

3B

• Alternatively they can be controlled by an independent controller

that provides power on demand.

10

Step 5 -

Mount The Mirror

1 2

• Conduct another resistance

test before mounting the
mirror as described on Page
14 to ensure the demister has
not been damaged and record
in the control card on Page 16.

• Ensure that the wall is clean,

dry and flat. The mirror
should be mounted in line
with the mirror manufacturers
instructions.

3

• Once mounted seal around

the edge of the mirror with
silicone

Plasterboard

1

Wall

Back Box

2

Demister

3

Mirror

4

Tile Adhesive

5

Tiles

6

• Ensure when mounting the

mirror that the supply cable
and its connections are not
trapped behind the mirror,
which would cause the mirror
to be stressed or sit unevenly
on the wall.

NOTE: Alterations or cuts are made to the mirror may cause cracking
when installed in conjunction with the Warmup Mirror Demister and
are not recommended. Alterations include:

• A rectangular hole for a switch, outlet, or other appliance.

• A hole exceeding a diameter of 2” (50mm). Common for plumbing

fixtures

• Inner angles cut into the mirror

11

Troubleshooting

Instructions which are shaded must completed by a qualified
electrician.

HEATING ISSUE 1 - The demister does demist my mirror

END USER ELECTRICIAN

With the

demister

switched on

allow 3 - 5

minutes for the

demister to

heat up. Can
you feel heat in
on the mirror in

the demisters

location?

YES

If you can feel heat

on the mirrors

surface then

the demister is

working. Please see

the Performance
Troubleshooting

Guide.

NO

Are the wiring

connections

from the

demister to the

power supply

secure?

YES

Measure the

resistance of the

mirror demister. Is

the resistance in line

with the values on

Page 18.

YES

NO

NO

Rewire the

demister to the

power supply.

Mirror
Demister
has been

damaged and

may need
replacing.

HEATING ISSUE 2 - The demister trips the RCD

ELECTRICIAN

Are the connections from mirror

demister to power supply

secure?

NOYES

Conduct a resistance test on

the demister. Do the figures

match the control card and/or

reference resistance bands?

YESNO

Mirror Demister

has been

damaged and may

need replacing.

Test RCD

12

Rewire the demister

to the power supply.

Performance Troubleshooting

My mirror does
not heat/demist
my mirror

1. The demister may be installed on a solid wall
which be losing heat into the wall surface
behind.

If your mirror has been installed on a solid wall,

ensure that a gap is le between the demister and
brick, tile or cement walls to avoid heat transfer
away from the mirror.

My mirror has
cracked.

1. Old mirrors may not be suitable for use with
Warmup Mirror Demisters.

Before applying a mirror demister to any mirror, its

suitability with a demister should be checked with
the mirror manufacturer.

2. Check that there is suitable expansion space
around the perimeter of the mirror, that fixing
are flexible, not rigid and that there are no cuts
formed into the mirror which are prohibited in
Step 5.

13

How to test the Mirror Demister

The demister must be tested
before they have been installed
and again before mounting the
mirror. The resistance (ohms)
of each demister should be
measured. You should carry out the
following tests and should expect
the results detailed below:

Mirror Demister Resistance Test

Set a multimeter or ohmmeter to record resistance in the range of the
demister. Measure the resistance across the live (brown) and neutral
(blue) wires. Ensure the measured resistance is within the Reference
Resistance Band shown on Page 18 for the demister being tested.

Record the readings on the control card on Page 16 in line with the
installation procedure.

NOTE: Due to the high resistance of the demister, it may not be
possible to get a continuity reading from the demister and as such,
continuity testers are not recommended.

When checking resistance, make sure your hands do not touch the
meter’s probes as the measurement will include your internal body
resistance and render the measurement inaccurate. If you do not
get the expected results or at any time you believe there may be a
problem, please contact Warmup’s Technical Team for guidance.

14

Warranty

The Warmup® Mirror Demister is guaranteed by Warmup

plc (“Warmup”) to be free from defects in materials and
workmanship under normal use and maintenance, and
is guaranteed to remain so subject to the limitations and
conditions described below. The demister is guaranteed
for 5 years, except as provided below (and your attention
is drawn to the exclusions listed at the end of this guarantee).

This guarantee applies:

1. Only if the unit is registered with Warmup within 30 days aer purchase.
Registration can be completed online at www.warmup.co.uk. In the event
of a claim, proof of purchase is required, so keep your invoice and receipt

- such invoice and receipt should state the exact model that has been
purchased;

&

2. Only if the demister has been protected by a Residual Current Device

(RCD) at all times.

The guarantee is void if the mirror covering over the demister(s) is

damaged, replaced, repaired or covered with any subsequent layers. The
guarantee period begins on the date of purchase. During the period of
the guarantee Warmup will arrange for the demister to be repaired or (at
its discretion) have parts replaced free of charge. The cost of the repair
or replacement is your only remedy under this guarantee which does not
aect your statutory rights.

Such cost does not extend to any cost other than direct cost of repair or

replacement by Warmup and does not extend to costs of replacing or
repairing any mirror(s). If the demister fails due to damage caused during
installation, this guarantee does not apply. It is therefore important
to check that the demister is working (as specified in the installation
manual) prior to mounting the mirror.

WARMUP PLC SHALL IN NO EVENT BE LIABLE FOR INCIDENTAL OR

CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT LIMITED TO EXTRA
UTILITY EXPENSES OR DAMAGES TO PROPERTY.

WARMUP PLC is not responsible for:

1. Damage or repairs required as a consequence of faulty installation or
application.

2. Damage as a result of floods, fires, winds, lightening, accidents, corrosive
atmosphere or other conditions beyond the control of Warmup plc.

3. Use of components or accessories not compatible with this unit.

4. Products installed outside the United Kingdom.

5. Normal maintenance as described in the installation and operating

manual, such as cleaning the mirror.

6. Parts not supplied or designated by Warmup.

7. Damage or repairs required as a result of any improper use, maintenance,

operation or servicing.

8. Failure to start due to interruption and/or inadequate electrical service.

9. Any damage caused by frozen or broken water pipes in the event of

equipment failure.

10. Changes in the appearance of the product that does not aect its
performance.

Register your Warmup® warranty online at

www.warmup.co.uk

15

Control Card

Demister Location

.............................

............................

Total Wattage

................................

Warmup Mirror Demister Located
behind mirror - Risk of electric
shock

Electric-wiring and demister panel(s)
contained behind the mirror. DO NOT

penetrate with nails, screws, or similar

devices. DO NOT restrict the thermal

WARNING

emission of the heated mirror.

ATTENTION:

DO NOT cut or modify the demister at any stage.

The demister must be supplied from a circuit protected by a

30mA RCD and 5 A MCB or RCBO.

Demister Model Resistance Before Resistance Aer

Date Signed Company stamp/name

This form must be completed as part of the Warmup Guarantee.

Ensure that the values are as per the instruction manual.

This card along with a plan showing the demister position must

be situated close to the consumer unit in a visible place.

Warmup Plc 702 & 704 Tudor Estate Abbey Road

London NW10 7UW

T: 0345 345 2288 F: 0345 345 2299 www.warmup.co.uk

16

Layout Plan

NOTE: Draw a plan showing the location of the demister(s) on the
back of the mirror

17

Technical Specications

TECHNICAL SPECIFICATIONS - Warmup Mirror Demisters

OPERATING VOLTAGE 230 V AC : 50 Hz

IP RATING IP65

ELECTRICAL CLASS Class II

THICKNESS 0.4 mm

AVERAGE
TEMPERATURE RISE

25 °C

INPUT POWER 200 W/m²

CONNECTION 1.5 m LONG “COLDTAIL” CONNECTION

Mirror Size Guide

Warmup Mirror Demisters

SIZE

POWER

PRODUCT CODE

MD-SML1 260 x 360 14.1 0.06 3751

MD-MED1 360 x 560 33.3 0.14 1589

MD-LRG1 560 x 720 66.0 0.29 801

MD-CIRC Ø 560 42 0.183 1259

(mm)

(W)

LOAD

(A)

RESISTANCE (Ω)

REFERENCE

RESISTANCE

BANDS

(Ω)

3375.9 - 4126.1

1430.1 - 1747.9

720.9 - 881.1

1196 - 1322

18

Notes

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19

Warmup plc

United Kingdom

702 & 704 Tudor Estate

Abbey Road, London

NW10 7UW

Web: www.warmup.co.uk

Email: [e-mail]

Tel: [phone]

Fax: [phone]

Warmup PLC Heizsysteme

Niederlassung Deutschland

Oostraße 3

27793 Wildeshausen

Web: www.warmupdeutschland.de

Email: [e-mail]

Tel: 0 44 31 - 9 48 70-0

Fax: 0 44 31 - 9 48 70-18

The WARMUP word and associated logos are trade marks.

© Warmup Plc. 2020 – Regd. TM Nos. 1257724, 4409934, 4409926,

5265707. E & OE.

Bathroom

Heating

Warmup - IM - Demister - V1.3 2020-10-01

www.warmup.co.uk