If there are 4 flanges,
push down the top and
bottom flanges to leave
just 1 on either side.
Use a 35mm back box
with 2 screw flanges.
2.
16
7.2.2 Installing the Programmable Room Thermostat
1.
Use a flat headed screwdriver to press the fastener at the top of
the unit, then gently loosen from the unit, unhooking from top to
bottom.
Fix the 35mm back box, terminals at the top, onto a 2 flange
metal back box with 2 BM3.5x23 screws. If installing on a 4
flange metal back box, simply push down the flanges on the top
and bottom to leave the flanges on the left and right hand side.
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