The Outputs
RTU Input and Output Setup • 13
To connect to one of the DC power sources,
simply connect the sensor’s power wire to one of
the terminals.
4.1.5.1.
Current Ratings for On-Board
Power Sources
The maximum current that may be drawn from
the +12VDC terminal is 100 milliamps. The
maximum current that can be drawn from all
three +5VDC terminals COMBINED is 50
milliamps.
4.1.5.2.
Powering Sensors Requiring
24VAC Off the Power
Transformer
Some sensors that requires 24VAC can be
powered off the MultiFlex’s own 24VAC power
connection. To connect to the 24VAC power
source, connect the sensor’s power wires to
terminals AC1 and AC2.
This can only be done with sensors that keep the
24VAC signal isolated from its DC output signal
(such as Emerson’s Dewpoint Probe). If the
output signal is not isolated from the 24VAC
input, you must use a separate transformer.
4.2. The Outputs
4.2.1. MultiFlex RTU Fixed Outputs
The MultiFlex RTU has pre-defined locations
for connection to all outputs that are typically
present for a rooftop unit.
shows the
location of the RTU outputs, and
describes the location of each point. The default
locations cannot be changed in the RTU system
software, although outputs Auxiliary 1 and
Auxiliary 2 (points 6 and 7) may be configured
to control several different types of outputs.
Figure 4-6
- MultiFlex RTU Output Locations
RTU
Output
Point
Number
Label
Device to Connect To
This Point
1
FAN
The RTU fan.
2
HEAT 1
Heat stage #1.
3
HEAT 2
Heat stage #2.
4
COOL 1 Compressor for Cool stage
#1.
5
COOL 2
Compressor for Cool stage
#2.
Table 4-3
- RTU Default Outputs
Summary of Contents for MultiFlex RTU
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