Danfoss WP75-RF Installation guide

Brand: Danfoss

Model: WP75-RF

Category: Thermostats

Type: Installation guide

WP75

7 day electronic

programmable hot

water controller

Installation & User Instructions

Certification Mark

Index

Installation

Product speciﬁ cation 3

Thermostat (WP75-RF) installation 4-5

Sensor (CS1) installation 5-7

Wiring 7

Commissioning 8

User

What is a Cylinder Thermostat? 9

Your programmer 10

How to read the display 10

Preset programmes 11

Resetting the unit 11

Setting the Time and Day 12

Running your programme 12

Before changing the preset programmes 13

Programming the unit (7-day mode) 14

Programming the unit (5/2-day mode) 15

Running your programme 16

BOOST function 17

Hot Water Available function 17-18

Changing clocks forward/back 18

Battery backup 19

Contact details 20

Product Speciﬁ cation

Please Note:

This product should only be installed by a qualiﬁ ed

electrician or competent heating installer and

should be in accordance with the current edition of

the IEEE wiring regulations.

Important note RF products: Ensure that there are no large metal objects, such as boiler cases

or other large appliances, in line of sight between the transmitter and receiver as these will

prevent communication between thermostat and receiver.

Thermostat features WP75-RF

Power supply 2 x AA/MN1500/LR alkaline cells

Memory back-up 1 min for battery change

Transmission frequency (RF model) 433.92MHz

Transmitter range (RF model) 30m max

Max. ambient temperature 45°C

Temperature range 35 - 65°C

Dimensions, mm (W x H x D) Unit - 110 x 88 x 28

Remote Sensor - 48 x 48 x 45

Design standard EN60730-2-9 (EN300220 for RF)

Ball hardness test 75°C

Control pollution situation Degree 2

Time accuracy ± 1 min

Temperature accuracy ± 1°C

Installation Instructions

Thermostat Installation

Installation

WP75-RF installation

 Select a position for the WP75-RF that provides easy access to

the unit (it could be used on a daily basis by the user, so the

display needs to be clearly visible) and bearing in mind that

the maximum distance between the thermostat and sensor is

10 metres.

 Prepare the ﬁ xing position to provide access for the sensor

cable through the rear of the wallplate.

 If the cable is to be surface ﬁ xed note that it can only enter

the WP75-RF from the bottom through the positions shown

below.

 Fix the wallplate so that the control module can be easily

attached or removed. Make the sensor wiring connections as

shown in the wiring diagram on page 7.

 Before attaching the control module to the wallplate set the

DIL switch, located in a recess on the rear of the module, to

select whether the WP75-RF will be a 7 day controller or a 5/2

day (weekday/weekend) controller. Move both switches to the

desired position.

30mm min

Wall or plaster

box mounting

holes

Aperture for

rear entry

Clearance for

screwdriver access

Knockout for bottom

cable entry

Terminals

Outline of entry

 Attach the control module to the wallplate by placing the

slots in the top of the module over the lugs on the top edge

of the wallplate and hinging down until the slot in the bottom

edge of the module locates over the screw attached to the

wallplate. Tighten the screw.

CS1 Sensor installation

Gas or Oil ﬁ red Boiler Systems

 The sensor should be ﬁ tted to the side of the domestic hot

water cylinder, half way up from the bottom.

 Select the ﬁ xing position and remove sufﬁ cient insulation to

ensure that the sensor element can make close contact with

the surface of the cylinder wall.

 Clean away all traces of insulation and ensure both cylinder

wall and sensor are clean.

 Before mounting the sensor, coat the copper foil on the contact

surface of the sensor with the heat conducting paste supplied.

The sensor must be connected to the WP75-RF using double

insulated cable greater than 0.75mm

For insulation thicker than 25mm

and up to 55mm thick, use the

extra cover supplied as a spacer to

ensure that the sensor is held in

firm contact with the cylinder wall.

1/2 cylinder

height

Sensor Installation

IMPORTANT

1. Ensure cylinder wall is clean

2. Use heat transfer paste

provided

 Connect the cable to the sensor terminals and replace the

cover. Place the sensor on the cylinder and clamp tightly to

the cylinder using the strap provided.

 Cable entry is from behind if ﬁ tted to a single gang ﬂ ush box,

or from above, below or from the left if surface ﬁ xed cable is

used.

Fast Recovery Cylinder Heater Systems

 The sensor should be ﬁ tted to the side of the domestic hot

water cylinder just below the top seam.

 Select the ﬁ xing position and remove sufﬁ cient insulation to

ensure that the sensor element can make close contact with the

surface of the cylinder wall (see opposite).

 Clean away all traces of insulation and ensure both cylinder

wall and sensor are clean.

 Before mounting the sensor, coat the copper foil on the

contact surface of the sensor with the heat conducting paste

supplied.

Sensor Installation

For insulation thicker than 25mm

and up to 55mm thick, use the

extra cover supplied as a spacer

to ensure that the sensor is held

in firm contact with the cylinder wall.

IMPORTANT

1. Ensure cylinder wall is clean

2. Use heat transfer paste

provided

Thermostat Wiring

Wiring

Receiver

NL1234

L N

Boiler

Pump

2-port zone valve

Transmitter

A B

WP75-RF

RX1 Receiver

RX1 & RX2

RX3

RX1 & 2 (3055 12/01)

COM

ZONE

2 ON

ZONE

1 ON

ZONE

1 OFF

TERMINAL 1

RX2 ONLY

ELECTRONICS

RX Receiver Wiring

Note 1) For mains voltage operated systems link terminal 2 to mains live supply.

2) Power supply to unit must not be switched by timeswitch

 The sensor must be connected to the WP75-RF using double

insulated cable greater than 0.75mm

 Connect the cable to the sensor terminals and replace the

cover. Place the sensor on the cylinder and clamp tightly to

the cylinder using the strap provided.

Commissioning

If the thermostat and the receiver have been supplied together

in a combined pack, the units have been paired in the factory

and no commissioning is required (RX1 only).

To tune the RX receiver to the frequency of the thermostat signal,

follow steps 1-5 below.

1. WP75-RF

Press the recessed RESET button, using

a non-metallic object, to reset the unit.

2. Press & hold the recessed LEARN

button for 3 seconds, using a non-

metallic object.

NOTE: Thermostat now transmits

continuously for 5 minutes.

3. RX1

Press and hold buttons PROG and CH1

for 3 seconds until green light ﬂ ashes

once.

4. RX2 (if applicable)

Stat 1 - perform steps 1-3

Stat 2 - wait 5 mins, perform steps 1-2,

then press PROG + CH2 on RX2

RX3 (if applicable)

Stat 1 - repeat step 2-3 for CH1

Stat 2 - wait 5 mins, perform steps 1-2, then press PROG + CH2

on RX3

Stat 3 - wait 5 mins, perform steps 1-2, then press PROG + CH3

on RX3

5. WP75-RF

Press  or  - the unit will revert to

normal operation.

(1)

(2)

What is a cylinder thermostat?

... an explanation for householders.

A cylinder thermostat switches on and off the heat supply from the

boiler to the hot-water cylinder. It works by sensing the temperature

of the water inside the cylinder, switching on the water heating

when the temperature falls below the thermostat setting, and

switching it off once this set temperature has been reached.

Turning a cylinder thermostat to a higher setting will not make the

water heat up any faster. How quickly the water heats up depends

on the design of the heating system, for example, the size of boiler

and the heat exchanger inside the cylinder.

The water heating will not work if a time switch or programmer has

switched it off. And the cylinder thermostat will not always switch the

boiler off, because the boiler sometimes needs to heat the radiators.

Cylinder thermostats are usually ﬁ tted between one quarter and

one third of the way up the cylinder. The cylinder thermostat will

have a temperature scale marked on it, and it should be set at

between 60°C and 65°C, then left to do its job. This temperature is

high enough to kill off harmful bacteria in the water, but raising the

temperature of the stored hot water any higher will result in wasted

energy and increase the risk of scalding.

If you have a boiler control thermostat, it should always be set

to a higher temperature than that of the cylinder thermostat. In

most boilers, a single boiler thermostat controls the temperature

of water sent to both the cylinder and radiators, although in some

there are two separate boiler thermostats.

The text below has been edited and approved by the Plain English

Campaign, who has issued a Crystal Mark to be displayed with it.

What is a cylinder thermostat?

Please note: The WP75-RF is a programmable cylinder thermostat.

Your programmer

The WP75-RF is a wireless programmable thermostat, designed to

control the temperature of the water in your hot water cylinder.

Heating water to a temperature which is higher than necessary

is wasteful of energy. The WP75-RF lets you heat your water to a

temperature you require, just at the times you need it. You can

programme up to three ON times and temperatures per day.

It also features a BOOST function, to provide an instant tank of hot

water, as well as a Hot Water Available function, which tells you

how much hot water you have available in your cylinder.

How to read the display

Overview & reading the display

User Instructions

Weekdays (Mon-Fri) Weekend (Sat-Sun)

Event Time Temp °C Event Time Temp °C

1 06:30 55.0 1 07:30 55.0

2 08:30 OFF 2 09:30 OFF

3 12:30 45.0 3 11:30 45.0

4 13:30 OFF 4 13:30 OFF

5 16:00 55.0 5 16:30 55.0

6 22:00 OFF 6 22:30 OFF

Preset Programmes

Your WP75-RF comes ready programmed with a set of operating

times and temperatures which often suit most people.

Please note: In order to reduce the risk of Legionella infection, it is

recommended that water temperature be set to not less than 60°C for

at least one event each day.

If you want to change any of these settings you can do so by

following the instructions on pages 13-15.

First, follow the steps on page 11-12 to set the correct time and date.

Before you start

Open the ﬂ ap on the front of your

programmer. Using a non-metallic

object, press the recessed RESET button,

until you hear a click and the display

goes momentarily blank.

This will reinstate the preset programmes

and will set the time to 12:00 on Day 1.

Preset Programmes & Resetting the unit

BOOST

OFF

AUTO

ALLDAY

Setting the Time/Day & Running the programme

Setting the Time & Day

Press PROG until the time and day number

begin to blink in the display.

DAY - Press DAY until correct day is shown

(1=Monday, 2=Tuesday etc).

TIME - Press + and - to change time (press

and hold to change in 10 min increments).

Press PROG again to accept the settings.

If you are happy to use the preset

programmes on page 11, you don’t need to

do anything else.

Press PROG until colon ﬂ ashes in display.

Your unit is in RUN mode and your hot

water will be heated according to the preset

programmes.

Running your programme

change

DAY

To change TIME

Changing the programmes

Please Note

The unit must be programmed in sequence and ON/OFF

times cannot be programmed out of sequence.

If you want to leave a preset time as it is, simply press

PROG to move on to the next setting.

If at any time you get confused and need to reset the

unit to the preset programmes, press and hold the

recessed RESET button, using a non-metallic object

(see page 11).

Before you change the preset programme

Your installer will have set your unit to operate in either 7-day

mode or 5/2 day mode.

To tell which mode your unit is set press PROG until Event 1 ﬂ ashes

in the display.

If your display looks like this, your unit is

in 7-day mode and you can programme

different settings for each day of the week

(see page 14).

If your display looks like this, your unit is in

5/2 day mode and you can enter one set

of programmes for weekdays and another

set for weekends (see page 15).

a) Press PROG until Event 1 ﬂ ashes, then

press DAY to move from current day to

Day 1 (Event 1, Day 1).

b) Amend the time and temperature as

follows:

i) Use + and – buttons to alter time

(press and hold to change in 10 min

increments).

ii) Use  and  buttons to alter the water

temperature in 0.5°C (1°F) steps.

iii) Press NEXT to advance to next preset time

and temperature (Event 2, Day 1).

iv) Repeat steps i, ii & iii above for Events 2,

3, 4, 5 & 6.

c) When all 6 events are correct, press DAY

to programme events for Day 2.

(If you wish to repeat the previous day’s

programme, simply press COPY) .

d) Repeat steps i-iii above to programme

(or COPY) events for Days 3, 4, 5, 6 & 7.

Press PROG until the colon in the LCD display

starts to ﬂ ash.

The unit is now in RUN mode and your

hot water will come on and go off at the

programmed times.

Proceed to page 16.

Programming in 7-day mode

(separate programmes for each day of the week)

Programming in 7-day mode

For Days 1-5 (weekdays)

a) Press PROG until Event 1 ﬂ ashes in

display (Event 1, Days 1,2,3,4,5).

b) Use + and – buttons to alter time

(press and hold to change in 10 min

increments).

c) Use  and  buttons to alter the water

temperature in 0.5°C (1°F) steps.

d) Press NEXT to move to next preset time &

temperature (Event 2, Days 1,2,3,4,5).

e) Repeat steps b, c & d for programming

Events 3, 4, 5 & 6.

For Days 6-7 (weekends)

 Press PROG until Event 1 ﬂ ashes in

display (Event 1 Days 6-7).

 Repeat steps b, c and d above to

programme time and temperature

events for the weekend.

Press PROG until the colon in the LCD display

starts to ﬂ ash.

The unit is now in RUN mode and your

hot water will come on and go off at the

programmed times.

Proceed to page 16.

Programming in 5/2 day mode

(one set of programmes for weekdays, another set for weekends)

Programming in 5/2-day mode

Running your programme

To run the hot water programme press

the SELECT button.

As you press the SELECT button a bar in

the display will move to indicate which

RUN mode has been selected.

The four available functions and their meanings are as follows:

Select the option you require, depending on your circumstances,

time of year, etc.

BOOST

OFF

AUTO

ALLDAY

 ON = the water will be heated continuously to the

highest temperature set for the day shown on the

display.

 OFF = the water will not be heated at all (unless the

BOOST button is pressed - then the water will be

heated to the highest temperature set for the day.

When this temperature is achieved the thermostat

with revert to OFF.)

 AUTO = the water will come on and go off at the

programmed times.

 ALLDAY = the water will remain on from setting 1

(1st ON) through to setting 6 (last OFF), at the highest

temperature set for the day.

BOOST Function and Hot Water Available Function

BOOST function

Sometimes you may have an immediate requirement for hot water

which is outside the set programme.

 For instant hot water press the BOOST button.

If the system is OFF when you press BOOST - the water

will heat up to the highest setting of the day and then turn

itself off again.

If the system is ON when you press BOOST - the water will

heat up to the highest setting of the day (but only if the

current programmed temperature is lower).

Hot Water Available function

Sometimes you may need to know how much hot water there is in

your tank. With the WP75-RF a simple ‘hot water available’ function

is included.

 To see an approximate indication of how much hot

water is currently stored press the  and  buttons

simultaneously.

The number of horizontal bars displayed indicates approximately

how much hot water is available at the temperature shown.

Hot Water Available function and Changing Clocks

Cylinder more than ⅔ full of

hot water.

Cylinder between ⅓ and ⅔

full of hot water.

Cylinder less than ⅓ full of

hot water.

Open the ﬂ ap on the front of the unit to

reveal the programming buttons.

To change from Summer to Winter

(clocks back) -

 press and hold - button

To change from Winter to Summer

(clocks forward) -

 press and hold + button

Changing clocks forward & back

Take care when making this change for the ﬁ rst time. If

it is made in the wrong direction the unit will have to be

reset and any user-settings re-entered.

(See pages 11-12 on how to Reset the unit and how to set

the Time & Day)

NOTE: After the ﬁ rst time this change has been made this

feature will only allow the clock to be changed in the opposite

direction.

Battery Replacement

 When batteries are low a battery

symbol will ﬂ ash in the LCD display.

 You have 2 weeks to replace the

battery before the unit will switch off.

 When changing batteries, remove old batteries and insert new

ones within one minute and programming will not be lost.

IMPORTANT: use 2 x AA size (LR6) high quality alkaline dry

cell batteries.

NB. If the display ever goes blank during normal operation, the

batteries will need to be renewed, the unit reset and the time and

programmes reset.

Battery replacement

Danfoss Randall Ltd

Ampthill Road

Bedford

MK42 9ER

Tel: 01234 364621

Fax: 01234 219705

Part No 34248 Issue 5 06/06

Still having problems?

Call your local heating engineer:

Name:

Tel:

For problems relating to your heating controls ...

Visit our website:

www.danfoss-randall.co.uk

Email our technical department:

drl_technical@danfoss.com

Call our technical department

0845 121 7505

(8.45-5.15 Mon-Thurs, 8.45-4.45 Fri)

For a large print version of these instructions

please contact the Marketing Services

Department on 0845 121 7400.

Danfoss WP75-RF Installation guide

Brand: Danfoss

Model: WP75-RF

Category: Thermostats

Type: Installation guide

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