AAON RQ SERIES, Manual

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2. Obtain a Class 2 24 VAC
transformer with a capacity of 40 to
100 VA and an output of 24 VAC at
a frequency of 60 Hz. Alternatively,
a 120 VAC to 12 VDC or 120 VAC
to 24 VDC Class 2 step-down power
supply with a 40 to 100 W power
rating may be used. The schematics
of the power sources are shown
below in Figure 18.
a. For the user’s own safety,
only Class 2 power sources
should be used to power the
MSEV and USHX devices.
3. Double check the power source
output voltage (AC transformer
secondary or DC power supply
output).
a. The reading should be at or
near 12 VDC, 24 VDC, or 24
VAC depending on the
MSEV and power source.
When supplying 24 V, the
voltage must be within the
range of 20.4 V to 27.6 V.
When supplying 12 V, the
voltage must be within the
range of 10.2 V to 13.8 V.
Figure 18 - Class 2 DC and AC power sources