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Lifestyle |
SINGLE |
DUAL |
CHANNEL |
CHANNEL |
Timeswitch |
Programmer |
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for heating OR hot water |
for heating AND hot water |
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LP111, LP711 |
LP112, LP241, LP522, LP722 |
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SINGLE |
DUAL |
CHANNEL |
CHANNEL |
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Installation Instructions
06490033001 ISSC
Climate Controls Europe
Sales: 0845 1305522 / Technical Helpline: 0845 1307722
Email: customer.care@invensys.com / Web: www.draytoncontrols.co.uk
INSTALLATION INSTRUCTIONS
PLEASE NOTE: INSTALLATION MUST ONLY BE
CARRIED OUT BY A QUALIFIED ELECTRICIAN OR
HEATING ENGINEER.
MAKE SURE MAINS INPUT HAS A 3 AMP FUSE.
TECHNICAL DATA
LP112, LP241, LP522 & LP722 PROGRAMMERS
LP111 & LP711 TIMESWITCHES
Voltage |
230V AC +10% - 10% 50Hz |
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Programmer Rating |
2 (1) A 230V AC each switch |
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Timeswitch Rating |
2 (1) A 230V AC |
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Ambient temp |
Operating: 0º to 45ºC |
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Storage: -20ºC to 50ºC |
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Without mains power |
Display: blank |
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Time: always kept |
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Program times: always preserved |
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Programming resolution |
1 minute |
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Wiring |
Fixed wiring only, to comply with |
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current IEE regulations |
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Maintenance |
Must be maintained by a qualified |
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electrician or heating engineer |
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Lifestyle Programmers and Timeswitches conform to the essential requirements of these Directives:
89/336/EEC – Electromagnetic compatibility 73/23/EEC – Low voltage
BEFORE INSTALLATION
First, make sure the mains supply is switched off!
PROGRAMMER ONLY
The programmer must be set to the type of system it is to control. The link on the back of the unit has two settings – P and G.
P = a fully pumped and controlled system – allowing heating and hot water to be set separately.
G = a gravity-fed hot water system – which does not allow independent setting of heating without hot water, though hot water can be controlled alone.
USING AN EXISTING WALL-PLATE
Loosen the securing screws on the old programmer and unplug it. Check that there’s 70mm clearance to the right of the wall-plate, and 25mm above it. Check the chart on the next page to compare terminals and if necessary, change the wiring of the wall-plate to suit. Now plug the Lifestyle unit into the wall-plate and tighten the securing screws.
Check the 3A fuse, and switch on the mains.
FITTING A NEW WALL-PLATE
The ideal location is 1.4m above floor level, with reasonable lighting, good access, no condensation, no extremes of temperature, and a supporting surface that fully covers the back of the unit.
Position with 70mm clearance to the right, 25mm above, and sufficient room to access the securing screws underneath.
Fix, with terminals at the top, either direct to a flat wall using wall plugs and No. 6 x 1” (25mm) woodscrews, or on a flush mounting single conduit box type UA1 (BS4662) using M3.5 x 14 bolts. DO NOT USE A SURFACE MOUNTING BOX.
TIMESWITCH TERMINAL COMPARISONS
MAKE |
MODEL |
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Earth |
Neutral |
Live |
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Common |
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On |
Off |
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Spare |
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Current |
Models |
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Drayton |
Tempus 1, 2 (new models) |
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N |
L |
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1 |
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3 |
2 |
4 |
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Lifestyle |
LP111, LP711 |
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N |
L |
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1 |
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3 |
2 |
4 |
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Switchmaster |
300 |
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N |
L |
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4 |
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1 |
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Discontinued/Competitors’ Models |
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ACL |
TC (Towerchron) |
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2 |
1 |
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4 |
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7 |
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Drayton |
Tempus 1, 2 (old models) |
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N |
L |
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1 |
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2 |
3 |
4 |
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Switchmaster |
980 |
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N |
L |
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4 |
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1 |
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Danfoss Randall |
TS15, 75 (Mk18) |
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E |
N |
L |
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1 |
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4 |
2 |
5/6 |
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Danfoss Randall |
TS715 |
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E |
N |
L |
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1 |
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4 |
2 |
3 |
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Danfoss Randall |
TS975 |
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E |
N |
L |
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5 |
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4 |
6 |
1,2,3 |
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Danfoss Randall |
SET1, SET1E |
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E |
N |
L |
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5 |
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4 |
6 |
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Danfoss Randall |
SET4 |
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E |
N |
L |
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5 |
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4 |
6 |
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Danfoss Randall |
103, 103E, 103E5, 103E7 |
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4 |
5 |
6 |
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3 |
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1 |
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2 |
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Danfoss Randall |
911, 971 |
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E |
N |
L |
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5 |
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6 |
4 |
2 |
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Grasslin Towerchron |
QE1 |
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N |
L |
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2 |
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4 |
3 |
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Grasslin Towerchron |
T2001, T2001Q |
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E |
N |
L |
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7 |
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Honeywell |
ST 6100A, ST 6100C |
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N |
L |
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1 |
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4 |
2 |
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Honeywell |
ST 7000B |
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L |
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3 |
2 |
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Horstmann |
Centaur SC1, SC7 |
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N |
L |
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4 |
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3 |
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Horstmann |
Centaur Plus, C11, C17 |
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N |
L |
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2 |
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4 |
3 |
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Horstmann |
Emerald 423, Pearl Auto |
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E |
N |
L |
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3 |
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4 |
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Horstmann |
517, Coronet, H11, H17 |
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E |
N |
L |
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5 |
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4 |
6 |
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Landis & Staefa |
RWB3 |
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N |
L |
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4 |
3 |
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Landis & Staefa |
RWB30, RWB50, 100, 152, 170 |
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N |
L |
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2 |
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4 |
3 |
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Landis & Staefa |
RWB7 |
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N |
L |
2 |
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4 |
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3 |
1 |
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Potterton Myson |
EP4000, 4001, 4002, 5002 |
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N |
L |
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5 |
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4 |
2 |
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Sangamo |
M6 |
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E |
4 |
6 |
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3 |
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1 |
2 |
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Smiths |
Centroller Mk1, Mk2 |
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N |
L |
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3 |
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2 |
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Smiths |
Centroller 30 |
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1 |
2 |
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4/5 |
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Smiths |
Centroller 300, 980 |
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N |
L |
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4 |
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1 |
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Sunvic |
Select 107 |
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N |
L |
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1 |
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3 |
2 |
4 |
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Sunvic |
SP20, SP35 |
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N |
L |
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3 |
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5 |
4 |
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S |
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Venner |
Vennerette |
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N |
L |
LINE |
LOAD |
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PROGRAMMER TERMINAL COMPARISONS |
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MAKE |
MODEL |
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Earth |
Neutral |
Live |
H/W off |
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C/H off |
H/W on |
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C/H on |
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Current Models |
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Drayton |
Tempus 6, 7 (new models) |
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N |
L |
1 |
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2 |
3 |
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4 |
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Lifestyle |
LP112, LP241, LP522, LP722 |
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N |
L |
1 |
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2 |
3 |
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4 |
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Switchmaster |
400, 600 |
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N |
L |
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4 |
3 |
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1 |
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(no connection to terminal 4 on 600) |
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Switchmaster |
805 |
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N |
L |
4 |
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2 |
3 |
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1 |
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Discontinued/Competitors’ Models |
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ACL |
MP (Towerchron) |
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2 |
1 |
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6 |
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10 |
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ACL |
FP (Towerchron) |
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2 |
1 |
8 |
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11 |
6 |
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10 |
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Drayton |
Tempus 3, 4, 6, 7 (old models) |
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N |
L |
1 |
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2 |
3 |
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4 |
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Switchmaster |
905, 9001 |
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N |
L |
4 |
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2 |
3 |
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1 |
Danfoss Randall |
CP15, CP715, FP15, FP715 (Mk18) |
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E |
N |
L |
1 |
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2 |
3 |
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4 |
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Danfoss Randall |
3020P, 3060 |
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E |
7 |
6 |
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4 |
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2 |
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Danfoss Randall |
4033 (link 1-6) |
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E |
7 |
6 |
5 |
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3 |
4 |
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2 |
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Danfoss Randall |
102, 102E, 102E5, 102E7 (link 6-3) |
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E |
5 |
6 |
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1 |
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2 |
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Danfoss Randall |
701 (link L-5 and 5-6) |
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E |
N |
L |
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3 |
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1 |
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Danfoss Randall |
702 (link L-5 and 5-6) |
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E |
N |
L |
4 |
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2 |
3 |
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1 |
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Danfoss Randall |
922, 972 (link L-2 and 2-5) |
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E |
N |
L |
1 |
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4 |
3 |
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6 |
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Danfoss Randall |
SET2, SET2E, SET3E, SET3M, FP975 |
E |
N |
L |
3 |
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6 |
1 |
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4 |
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SET5 (link L-2 and 2-5) |
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Grasslin Towerchron |
DP 72, QE2 |
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N |
L |
1 |
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2 |
3 |
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4 |
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Honeywell |
ST 699/799 (link L-5 and 5-8) |
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N |
L |
7 |
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4 |
6 |
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3 |
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Honeywell |
ST 6200, ST 6300, ST 6400, ST 6450 |
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N |
L |
1 |
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2 |
3 |
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4 |
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Honeywell |
ST 7100 (link L-3 and 3-6) |
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N |
L |
7 |
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4 |
8 |
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5 |
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Horstmann |
525, 527, 425 Diadem, H21, H27, |
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E |
N |
L |
3 |
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6 |
1 |
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4 |
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H121, Tiara (link L-2 and 2-5) |
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Horstmann |
Centaur Plus, C21, C27 |
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N |
L |
1 |
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2 |
3 |
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4 |
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Landis & Staefa* |
RWB2, RWB2E, 20, 40, 102, 200, |
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N |
L |
1 |
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2 |
3 |
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4 |
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252 & 270, RWB9 |
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Myson |
Microtimer (link L-5 and 5-8) |
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N |
L |
7 |
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4 |
6 |
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3 |
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Potterton Myson |
All EP2000’s, EP3000’s, EP6000’s |
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N |
L |
1 |
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2 |
3 |
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4 |
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(link L-5 and N-N) |
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Potterton Myson* |
Mini Minder |
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N |
L |
1 |
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2 |
3 |
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4 |
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Sunvic |
Select 207 |
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N |
L |
1 |
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2 |
3 |
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4 |
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Sunvic |
SP50, SP100 (link L-3) |
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N |
L |
1 |
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4 |
2 |
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5 |
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* Can simply be removed from the backplate and replaced without any disturbance to the existing wiring.
WIRING THE TIMESWITCH
Make the wiring connections as above. Note that the output contacts are voltage-free, so power needs to be put on to Terminal 1 either by linking from Terminal L or from a separate supply with a 3A fuse.
WIRING THE PROGRAMMER
USING A DRAYTON SIMP-L-FIT, ALTHOUGH NOT NECESSARY, WILL MAKE THIS INSTALLATION EASIER.
*Thermostat Key
C Common
H Call for Heat S Satisfied
N Neutral
E Earth
L Live
Connection Charts
Arrowed numbers relate to the junction box.
Consult boiler handbook for details of pump overrun wiring.
Wiring Colour Codes
GR |
Grey |
Y |
Yellow |
BK |
Black |
BL |
Blue |
BR |
Brown |
RD |
Red |
W |
White |
OR |
Orange |
YG |
Yellow/Green |
|
Lifestyle |
SINGLE |
DUAL |
CHANNEL |
CHANNEL |
Timeswitch |
Programmer |
|
|
for heating OR hot water |
for heating AND hot water |
|
|
LP111, LP711 |
LP112, LP241, LP522, LP722 |
|
|
SINGLE DUAL CHANNEL CHANNEL
User Instructions
06490033001 ISSC
Climate Controls Europe
Sales: 0845 1305522 / Technical Helpline: 0845 1307722
Email: customer.care@invensys.com / Web: www.draytoncontrols.co.uk
User’s Instructions
TIMESWITCHES
INTRODUCTION
Lifestyle Timeswitches will automatically control your system by switching it on and off at times that suit you. The red light on the front of the timeswitch shows when it’s on.
■LP111 – a 24hr program, up to 3 heating periods each day, and every day the same.
■LP711 – a 7-day program, allowing for different
timings on each day of the week, up to 3 heating periods each day.
If the engineer hasn’t set your timings for you, your timeswitch will work with a standard program that has been set at the factory. If this doesn’t suit you, it’s very easy to change it – when you’ve read this introductory section, simply turn to
the page for your timeswitch model.
Remember:
■Make your changes using the SET?, YES/-, and + buttons.
■You can’t set ON1 as the last timing before midnight, but you can set OFF3 after midnight – providing it’s not more than 23 hours and 59 minutes after ON1.
■You need to set the timings in sequence – i.e. ON1, OFF1, ON2, OFF2, ON3, OFF3. If you get out of sequence, the display will flash a warning.
SWITCHING
ON 1 – start of first timed period
OFF 1 – end of first timed period
ON 2 – start of second timed period
OFF 2 – end of second timed period
ON 3 – start of third timed period
OFF 3 – final switch-off of the day
If the engineer has set your program and timings – you won’t need to do anything else. Just keep this guide in a safe place for future reference.
DAY-TO-DAY VARIATIONS
Sometimes you might need to change the way you use your system temporarily – perhaps due to an exceptionally cold day.
Here’s how to do it – without affecting the timings in your program.
Switching on and off
On the front of the timeswitch is an Advance button. It allows you to switch your system on or off, irrespective of the program. Press Advance to switch it on, and it will stay on until the end of the next OFF period. Turn it off, and it will stay off until the beginning of the next ON period.
DAY-TO-DAY VARIATIONS Cont...
Over-riding the program
At the side of the display there are four operating modes:
OFF |
= |
continuously off. |
TIMED |
= on for up to 3 periods a day. |
|
ONCE |
= on for 1 period a day, from the start of ON1 |
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|
|
to the end of OFF3. |
ON |
= |
continuously on. |
Use the SELECT button under the flap to change the mode. This won’t alter the timings in your program, which you can return to by selecting TIMED.
THE LP111 24hr ELECTRONIC TIMESWITCH
LP111 – a 24hr program, up to 3 heating periods each day, and every day the same.
Want to leave a timing as it is? Just press SET? and move on to the next one.
If you need to reset your timings to the standard program and start again, press ‘SET’ and ‘+’ together to go back to the pre-set program.
The standard program
Your system will come on for up to 3 heating periods every 24hrs. ON1 starts the first one, OFF1 finishes it, and so on. Notice that ON2 and OFF2 are set to the same time.* This means your system won’t respond, but if you want to activate that middle period or change any other timings – read on.
SWITCHING |
STANDARD PROGRAM |
||
ON 1 |
– start of first timed period |
6.30am |
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OFF 1 |
– end of first timed period |
8.30am |
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ON 2 |
– start of second timed period* |
12.00pm |
|
OFF 2 |
– end of second timed period* |
12.00pm |
|
ON 3 |
– start of third timed period |
4.30pm |
|
OFF 3 |
– final switch-off of the day |
10.30pm |
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Changing the timings
■ Press the SET? button and you’ll see ‘SET PROG?’.
PROG?
■Press the YES button, and you’ll see ON1, the start of your first heating period. Adjust it in 1-minute steps using the – and + buttons. If the – and + buttons are held down, the time changes in 10-minute steps.
■Press SET?, and you’ll see OFF1, the end of your first heating period. Adjust this in the same way, press SET?, then repeat the procedure for ON2, OFF2, ON3 and OFF3.
■When you press SET? after setting OFF3, the timeswitch will return to normal operation.
THE LP711 7-DAY ELECTRONIC TIMESWITCH
LP711 – a 7-day program, allowing for different
timings on each day of the week, up to 3 heating periods each day.
Want to leave a timing as it is? Just press SET? and move on to the next one.
If you need to reset your timings to the standard program and start again, press ‘SET’ and ‘+’ together to go back to the pre-set program.
The standard program
Your system will come on for up to 3 heating periods every 24hrs. ON1 starts the first one, OFF1 finishes it, and so on. Notice that ON2 and OFF2 are set to the same time.* This means your system won’t respond, but if you want to activate that middle period or change any other timings – read on.
|
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SWITCHING |
STANDARD PROGRAM |
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MON-FRI |
SAT-SUN |
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ON 1 |
– start of first timed period |
6.30am |
7.00am |
|
OFF 1 |
– end of first timed period |
8.30am |
9.00am |
|
ON 2 |
– start of second timed period* |
12.00pm |
12.00pm |
|
OFF 2 |
– end of second timed period* |
12.00pm |
12.00pm |
|
ON 3 |
– start of third timed period |
4.30pm |
4.00pm |
|
OFF 3 |
– final switch-off of the day |
10.30pm |
11.00pm |
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THE LP711 7-DAY ELECTRONIC TIMESWITCH Cont...
Changing the timings
■ Press the SET? button and you’ll see ‘SET PROG?’.
PROG?
Set all weekdays
First you set the times that are going to be the same for each weekday, then you can select each day individually and make any further adjustments. If you want each day to be quite different, go straight to ‘Set each day’.
■Press the YES button, and the display will ask ‘SET MON to FRI PROG?’.
MON TUE WED THU FRI
PROG?
■Press YES and you’ll see ON1, the start of your first heating period. Adjust it in 1-minute steps using the – and + buttons. If the – and + buttons are held down, the time changes in 10-minute steps.
■Press SET?, and you’ll see OFF1, the end of your first heating period. Adjust this in the same way, press SET?, then repeat the procedure for ON2, OFF2, ON3 and OFF3.
Set each day
■If, after you’ve set OFF3 you want to fine-tune one or more weekdays, press SET? until you find the first day you want to adjust – then go through the procedure, altering any time you wish. Press SET? to move on to the next day. When you’ve finished, press SET? until you see ‘SET SAT SUN PROG?’.
MON
PROG?
■If you don’t want to alter any individual days, keep pressing SET? until you see ‘SET SAT SUN PROG?’.
Set weekend
SAT SUN
■Press YES and alter ON1, OFF1, ON2, OFF2, ON3 and OFF3 times in the same way.
Set each day
■If, after you’ve set OFF3 for both SAT & SUN, you want to finetune Saturday or Sunday, press SET? until you find the first day you want to adjust – then go through the procedure, altering any time you wish. Press SET? to move on to the next day. When you press SET? after setting your hot water for Sundays, the programmer will go back to normal operation.
SAT
■If you don’t want to alter either day, keep pressing SET? until the programmer goes back to normal operation.
User’s Instructions
PROGRAMMERS
If the engineer has set your program and timings – you won’t need to do anything else. Just keep this guide in a safe place for future reference.
INTRODUCTION
Lifestyle Programmers will automatically switch your central heating and hot water on and off at times that suit you. Depending on your system, central heating and hot water can either both come on and off at the same time, or work independently. The red light on the front of the programmer shows when each one is on.
There are 4 models in the Lifestyle range:
■LP112 – a 24hr program, with linked central heating and hot water on for up to 3 heating periods each day, and every day the same.
■LP241 – a 24hr program, with central heating and
hot water working independently for up to 3 heating periods each day, and every day the same.
■LP522 – a 5/2-day program allowing for different
timings at the weekends, with central heating and hot water working independently for up to 3 heating periods each day.
■LP722 – a 7-day program allowing for different
timings on each day of the week, with central heating and hot water working independently for up to 3 heating periods each day.
INTRODUCTION Cont...
If the engineer hasn’t set your timings for you, your programmer will work with a standard program that has been set at the factory. If this doesn’t suit you, it’s very easy to change it – when you’ve read this introductory section, simply go to the section that contains your programmer model.
Remember:
■Make your changes using the SET?, YES/-, and + buttons on the programmer.
■You can’t set ON1 as the last timing before midnight, but you can set OFF3 after midnight – providing it’s not more than 23 hours and 59 minutes after ON1.
■You need to set the timings in sequence – i.e. ON1, OFF1, ON2, OFF2, ON3, OFF3. If you get out of sequence, the display will flash a warning.
SWITCHING
ON 1 – start of first timed period
OFF 1 – end of first timed period
ON 2 – start of second timed period
OFF 2 – end of second timed period
ON 3 – start of third timed period
OFF 3 – final switch-off of the day
The engineer has set your program and timings – you won’t need to do anything else. Just keep this guide in a safe place for future reference.
DAY-TO-DAY VARIATIONS
Sometimes you might need to change the way you use your central heating or hot water temporarily – perhaps due to an unusually cold day, or exceptional demand for hot water.
Here’s how to do it – without affecting your program.
Switching on and off
On the front of the programmer there are two Advance buttons
– one for central heating and one for hot water. They allow you to switch either on or off, irrespective of the program. So if the heating is off, and you want warmth now – press Advance to switch it on, and it will stay on until the end of the next OFF period. Or if the hot water is on and you don’t need it, press Advance and it will go off until the beginning of the next ON period.
Over-riding the program
On each side of the display there are four operating modes – one group for central heating, the other for hot water. You can change modes with immediate effect by using the appropriate SELECT button. This won’t alter the timings in your program, which you can return to by selecting TIMED.
OFF |
= |
continuously off. |
TIMED |
= on for up to 3 periods a day. |
|
ONCE |
= on for 1 period a day, from the start of ON1 |
|
|
|
to the end of OFF3. |
ON |
= |
continuously on. |
THE LP112 24hr ELECTRONIC PROGRAMMER
LP112 – a 24hr program, with linked central heating and hot water on for up to 3 heating periods each day, and every day the same.
If the timings haven’t been set for you, then your programmer will still be on the factory-set standard 24hr program, with central heating and hot water operating together on the same settings for every day of the week. But it’s easy to make changes – just follow the instructions.
Want to leave a timing as it is? Press SET? and move on to the next one.
If you need to reset your timings to the standard program and start again, press ‘SET’ and ‘+’ together to go back to the pre-set program.
If you don’t press anything for two minutes, the programmer automatically goes back to normal operation.
The standard program
Your system will come on for up to 3 heating periods every 24hrs. ON1 starts the first one, OFF1 finishes it, and so on. Notice that on the standard program ON2 and OFF2 are set to the same time.* This means your system won’t respond, but if you want to activate that middle period, or change any other timings – read on.
SWITCHING |
STANDARD PROGRAM |
||
ON 1 |
– start of first timed period |
6.30am |
|
OFF 1 |
– end of first timed period |
8.30am |
|
|
|
|
|
ON 2 |
– start of second timed period* |
12.00pm |
|
|
|
|
|
OFF 2 |
– end of second timed period* |
12.00pm |
|
ON 3 |
– start of third timed period |
4.30pm |
|
OFF 3 |
– final switch-off of the day |
10.30pm |
THE LP112 24hr ELECTRONIC PROGRAMMER Cont...
Changing the timings
■ Press the SET? button and you’ll see ‘SET PROG?’.
PROG?
■Press the YES button, and you’ll see ON1, the start of your first heating period. Adjust it in 1-minute steps using the – and + buttons. If the – and + buttons are held down, the time changes in 10-minute steps.
■Press SET?, and you’ll see OFF1, the end of your first heating period. Adjust this in the same way, press SET?, then repeat the procedure for ON2, OFF2, ON3 and OFF3.
■When you press SET? after setting OFF3, the programmer will return to normal operation.
THE LP241 24hr ELECTRONIC PROGRAMMER
LP241 – a 24hr program, with central heating and hot water working independently for up to 3 heating periods each day, and every day the same.
If the timings haven’t been set for you, then your programmer will still be on the factory-set standard 24hr program, with central heating and hot water operating together on the same timings for every day of the week. But it’s easy to make changes, and have heating and water working independently
– just follow the instructions.
Want to leave a timing as it is? Press SET? and move on to the next one.
If you need to reset your timings to the standard program and start again, press ‘SET’ and ‘+’ together to go back to the pre-set program.
If you don’t press anything for two minutes, the programmer automatically goes back to normal operation.
The standard program
Your system will come on for up to 3 heating periods every 24hrs. ON1 starts the first one, OFF1 finishes it, and so on. Notice that on the standard program ON2 and OFF2 are set to the same time for both central heating and hot water. * This means your system won’t respond, but if you want to activate that middle period, or change any other timings – read on.
|
|
SWITCHING |
STANDARD PROGRAM |
|
|
|
|
CH |
HW |
|
|
|
|
|
ON 1 |
– start of first timed period |
6.30am |
6.30am |
|
OFF 1 |
– end of first timed period |
8.30am |
8.30am |
|
ON 2 |
– start of second timed period* |
12.00pm |
12.00pm |
|
OFF 2 |
– end of second timed period* |
12.00pm |
12.00pm |
|
ON 3 |
– start of third timed period |
4.30pm |
4.30pm |
|
OFF 3 |
– final switch-off of the day |
10.30pm |
10.30pm |
Changing the timings
■ Press the SET? button and you’ll see ‘SET PROG?’.
PROG?
Set the central heating
■ Press the YES button, and the display will ask ‘SET CH PROG?’.
CH
PROG?
■Press YES and you’ll see ON1, the start of your first central heating period. Adjust it in 1-minute steps using the – and + buttons. If the – and + buttons are held down, the time changes in 10-minute steps.
■Press SET?, and you’ll see OFF1, the end of your first central heating period. Adjust this in the same way, press SET?, then repeat the procedure for ON2, OFF2, ON3 and OFF3.
Set the hot water
■When you press SET? after setting OFF3 for the central heating, the display will ask ‘SET HW PROG?’.
■Press YES, then set your times in the same way. Remember, in this mode you can have different times to your central heating if you wish.
■When you press SET? after setting OFF3 for the hot water, the programmer will return to normal operation.