Time Guard TS900B Operating Instructions Manual Download Page 2

TS900B 24 Hour Immersion 
Heater Time Controller

1

2

3

Self-cancelling and 

Override switch

Time 

indicator

Setting 
pins

24 hour 
programme ring

Store for 

unused 

setting 

pins

Concealed 

wiring for 

safety

Cover 
fixing 
screw

Removable 
cover

FITTING INSTRUCTIONS

1.  Choose any suitable flat surface between switched supply 

and immersion heater to fit the TS900.

2.  Remove cover by undoing screw on lower front cover.
3.  Place timeswitch in required position (it must be mounted 

vertically with the time indicator at the top) and mark wall at 
the centre of the top side.

4.  Measure down from this mark 5mm/0.2" and make a second 

mark. At this second mark drill a hole and plug, if necessary, 
to take a No 6 woodscrew.

5.  Screw in woodscrew until head is 2.5mm proud (see 

diagram).

6.  Place ‘Keyhole’ in back of timeswitch over screw head and 

slide downwards. Now mark wall through large recessed hole 
near bottom of unit. Remove Timeswitch, at this third mark 
drill and plug as before.

7.  Replace Timeswitch over screw head. Fit second woodscrew 

into recessed hole and tighten into wall.

8.  You are now ready to wire up.

5mm 
minimum

To Heater

From Supply

SL N

N

L

WIRING INSTRUCTIONS

1.  SWITCH OFF AT MAINS.
2.  Cut cable to suit Timeswitch position and bare ends of cable, 

connecting to Timeswitch as shown below.

3.  From immersion heater fit live connection (brown) into 

terminal 1. From immersion heater fit neutral connection 
(blue) into terminal 2. From both cables fit both earth 
connections (green yellow) into terminal E. From switch/supply 
fit neutral connection (blue) into terminal 4. From switch /
supply fit live connection (brown) into terminal 5. Ensure all 
screws are tightened.

4.  Fit two cable clamps using 4 self-tapping screws and tighten 

to grip outer insulation of both cables.

5.  Replace cover, tighten screw.
6.  Switch on mains and programme Timeswitch to your own 

requirements.

5mm

2.5mm

1

2

3

5

4

Please refer diagrams 
1-5 to sections 1-5 in 
above instructions.

Reviews: