Instruction Manual

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6. MVA INSTALLATION
6.1 CHANGING ACTUATOR ADAPTERS
The 410BT-MVA timer is factory set to t a 3/4 in. brass manual anti-
siphon valve. To install the controller with actuator on a 1 in. manual
anti-siphon valve, the 3/4 in. seat washer and adapter must be removed
and replaced with the 1in. adapter and seat washer, which are included
in this box.
1. Turn the actuator so that the seat
washer and the 3/4 in. threaded
adapter face up.
2. Using pliers, or a 5/16 in. wrench,
remove the seat washer screw by
turning counter clockwise and pull
off the 3/4 in. seat washer
assembly (see Fig. 6a).
3. Push the 3/4 in. threaded
adapter down towards the
actuator to ease the tension on
the retainer clip (see Fig. 6b).
4. Next, place your thumb on one
side of the retainer clip and with
a pair of pliers grip the other side
of the retainer clip and pull
outwards, away from your thumb,
and upwards, removing it from the
base of the 3/4 in. threaded adapter
then, remove the adapter (see Fig. 6c).
Figure 6a
Figure 6b
Figure 6c
5. Install the 1 in. threaded adapter
by pushing it onto the actuator
stem and making sure the notch
on the adapter lines up with
the notch on the stem of the
actuator (see Fig. 6d).
6. Spread the retainer clip with
your thumbs and push the
retainer into the adapter until it
clicks (see Fig. 6e).
7. Install the 1 in. seat washer
assembly as shown. Insert the
seat washer screw into the
bottom of the actuator stem and
tighten turning clockwise
(see Fig. 6f).
NOTE: Do not over-tighten.
Figure 6d
Figure 6f
Figure 6e