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EV-Series Premium
ERV
OPERATION
4.8 LOW VOLTAGE WIRING DIAGRAMS
4.8.1 Low Speed/High Speed Modes Continuous
When plugged in, the unit will run constantly at Low Speed. If the unit is to operate constantly
at High Speed, a jumper wire must be installed between the High Speed terminal and the 24
VAC terminal as well.
4.8.2 Low Speed Continuous/High Speed SWITCHED
If the EV Premium is to run constantly at Low Speed (Continuous mode or Off) and then switch
periodically to Boost mode in response to a controlling device. The external controlling device,
such as a PBT control or an occupancy sensor that is to trigger Boost mode (High Speed), is
connected to the 24 VAC terminal and to the High Speed terminal.
NOTE: Occupancy
sensors have a
total of six wires.
The two NO (Normally
Open) contact wires would
connect to the 24 VAC and
High Speed terminals. The
sensor’s 24 VAC power
wires would connect to the
COM and 24 VAC terminals
on the terminal strip. This
wiring configuration will
vary with each control
sensor.
5.0 OPERATION
5
.1 MANOMETER READINGS AT COMMISSIONING
Return Air Pressure Port
In. w.g.:
Exhaust Air Pressure Port
In. w.g.:
Outside Air Pressure Port
In. w.g.:
Supply Air Pressure Port
In. w.g.:
Pressure Drop:
Pressure Drop:
FIGURE 4.8.0 LOW VOLTAGE WIRING DIAGRAM 1
FOR CONSTANT HIGH SPEED CONTINUOUS
OPERATION, INSTALL A JUMPER WIRE FROM
THE 24 VAC TERMINAL TO THE HIGH SPEED
TERMINAL.
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If multiple controls are desired to operate the unit in Boost mode for different purposes, they
may be wired in parallel. The unit control board provides 6 VA so the combined power demand
for desired accessories must be lower than this threshold. For example, a PBT controller may be
wired to an EV Premium unit and up to 6 PBL controls may be wired in parallel. For additional
information see the installation manuals for the control(s) you select for wiring diagrams and
specific instructions.
FIGURE 4.8.1 LOW VOLTAGE WIRING DIAGRAM 2
NORMALLY OPEN
CONTACT WIRE
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NORMALLY OPEN
CONTACT WIRE
