I WARM 730 User And Installation Manual - page 20
Manual is about: Room Thermostat
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To install a thermostat you should take off the front cover
of the device. To do this, slightly push the locks one by one
(which are situated at the top and at the bottom of the front
cover) using thin screwdriver. At this time pull the front cover
out (Fig. 8). Take off the front cover and the frame (Fig. 9).
Fig. 8 Taking off the device cover
locks
frame
cover