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The hot water switch can be used to control the hot water in either a Y-Plan or S-Plan conguration.

The switch must be installed into the existing system in series with the hot water demand. In the

case of Y-plan the switch should be congured as shown (page 4) as a changeover switch to ensure

the three way valve operates correctly.

T1 and T2 are both normally open switches. When the unit is congured as a Y-Plan switch, the

system will recognise this and make T2 a normally closed switch.

Y-Plan Conguration

HTG ON

12:34

T2 T1

Boiler Existing controls

H/W on

Cosy switch

Existing hot

water valves

and tank

thermostat

H/W on

Constant live

H/W oﬀ

Constant live

250Vac supply

CAUTION!

MAINS VOLTAGE

T1A

T1B

T1C

T2A

T2B

T2C

MAINS

Step 2 – install the switch for hot water

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