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110VAC
24 VAC
/230VAC
For UL rating the
*
transformer must
be class 2 rated.
*If the power supply
is not current-limited,
an external 4A fuse
or circuit breaker
must be fitted.
MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
1
3
2
Fig. 15. Power wiring
DO NOT SWITCH ON POWER
Supply voltage: 24 VAC (20 to 30 VAC) 50/60 Hz
Important: Where multiple devices are powered from
a single transformer, the same side of the transformer
secondary must be connected to the same power input
terminal in each device.
Important: When connecting power ensure that one
leg of the 24VAC secondary circuit and the ground
terminal on the device are connect to a known earth
ground at the panel/enclosure. Limit the distance of the
power wire run between the device and the transformer
to 15 feet (4.5 meters and restricted for same room
installation).
The transformer must be UL Listed for smoke control.
The transformer also needs to mounted and installed in
an enclosure. It is recommended to use a 15407287
15
EN1Z-1076GE51 R1021
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