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8. Mounting the „FHT8V“ valve operating mechanism
a) Removing the old thermostat
• Remove the old mechanical
thermostat.
• If necessary, use multigrip pli
ers to loosen seized screws by
turning them counterclockwise.
b) Inserting the the batteries into
the valve operating mecha-
nism
• Remove the battery compart
ment cover of the valve oper
ating mechanism by sliding it
down.
• Insert two AA batteries into the
battery compartment.
Make sure to insert the batteries
with the correct polarity, see illus
tration in the battery compartment
and figure on the right
side.
• “C1” is displayed first, followed
by a twodigit number, “C2”,
and another twodigit number.
These two numbers are the
currently stored safety code of
the valve operating mechanism
(e.g. 11 and 22 = safety code
1122).