18
10. Mounting the ‘FHT8V’ valve operating mechanism
To save you from having to laboriously read through several user manuals (heating control and
valve operating mechanism) we have included information on how to mount and start up the
‘FHT8V’ valve operating mechanism on the following pages.
The valve operating mechanism is not supplied with the heating control and must
be ordered separately.
a) Removing the old thermostats
• Remove the old mechanical thermostats.
• If any of the screw connections have seized up you can use
multigrip pliers. Release the thermostats by turning anticlock-
wise.
b) Inserting the batteries into the valve operating mechanism
• Remove the battery compartment cover of the valve
operating mechanism by sliding it down and out.
• Insert two AA batteries into the battery compartment.
Make sure that you observe the correct polarity when
you insert the batteries. See the figures in the battery
compartment and in the image on the right.
• ‘
C1
C1
C1
C1
C1
’ is displayed, followed by a two-digit number. ‘
C2
C2
C2
C2
C2
’
is then displayed, followed by another two-digit number.
These two numbers are the currently stored 2-part
security code of the valve operating mechanism (11
and 22 = security code 1122, for example).
• A signal tone is then generated and ‘
A1
A1
A1
A1
A1
’ is displayed.
• The valve operating mechanism fully retracts the
control pin to facilitate mounting.
• After this ‘
A2
A2
A2
A2
A2
’ is displayed.
Figure 9
Figure 10
