Distech Controls VA-024ZS Series Hardware Installation Manual page 2

The vertical position is recommended for mounting.
Figure 2. Acceptable Mounting Positions.
Actuators must not be exposed to condensed/dripping
water. If the actuators are installed below piping that can
drip condensate, either the actuator needs to be protected
by shielding to deflect the water drip or the piping needs to
be insulated to prevent condensation.
Actuator housing must not be in contact, or close proximity
to adjacent hot water supply or return piping.
Loosen retaining ring and rotate actuator if necessary, to
avoid proximity or contact with hot water supply or return
piping, then re-tighten ring to maintain desired orientation.
Installation
The black actuator attachment support ring must be in place
on top of the valve bonnet before installing the actuator.
If the support ring is not in place, damage to the actuator
connection may result.
Mounting the VA-024ZSO Series Actuator to a Valve
1. Place the actuator on the valve and firmly hand-tighten the coupling
piece.
2. Connect the wires. See Wiring.
Mounting the VA-024ZSC Series Actuator on a Valve
1. Rotate the manual override lever and latch.
2. Place the actuator on the valve and firmly hand-tighten the
coupling piece.
Failure to fully rotate the manual override handle beforehand
tightening will hinder proper valve close off.
3. Release manual override handle.
4. Connect the wires. See Wiring.
Figure 3. Mounting the Actuator on a Valve.
The installation is now complete.
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Removing the Actuator from a Valve
1. Disconnect the wiring.
2. Unscrew actuator-coupling piece from the valve body threads.
3. Remove the actuator from the valve.
Wiring
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All wiring must conform to NEC and local codes and regulations.
-
Use earth ground isolating step-down Class 2 transformers.
Do not use autotransformers.
-
Determine the supply transformer rating by summing the total VA
of all actuators used. The maximum rating for a Class 2 step-
down transformer is 100 VA.
It is recommended that one transformer power no more
than 10 actuators
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VA-024ZSC024D / VA-024ZSO024D, 24 Vac actuators: Wiring
connection can be made inside the actuator housing (remove the
housing top for access).
-
VA-024ZSC120D/VA-024ZSO120D, line voltage actuators: Wiring
connection requires junction box and flex conduit no further than
15 inches (381 mm) from actuator.
G0 and G must be properly wired for correct function and full
life of the actuator.
Figure 4. 24 Vac Actuator Wiring Diagram.
Figure 5. 120 Vac Actuator Wiring Diagram.
Manual Override
For manual positioning, rotate the manual override handle clockwise
180°, and squeeze it to latch around protruding stop. See Figure 6.
The actuator will automatically unlatch when power is
applied.