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16
EV-Series Indoor
ERV
INSTALLATION
5.3 ELECTRICAL REQUIREMENTS
5.3.1 Electronically Commutated Motors
These ERVs may be ordered with factory-installed features including Electronically Commutated
(EC) Motors. Consult the supplemental Installation and Operation Manual(s) for these features if
supplied.
Electrical Options are identified on the Unit Label located near electrical box on the outside of
the unit. Find the complete Unit Model Number in the lower left corner of the Unit Label. Use the
configuration chart to determine motor power and voltage installed in your EV450IN.
NOTE: Standard
EV450IN with sin-
gle phase original
equipment motors are
suitable for use with solid
state speed control.
NOTE: Le EV450IN
avec moteurs
d’équipement
d’origine monophasés sont
adaptés pour une utilisa-
tion avec regulateur de
vitesse electronique.
NOTE: If your unit
is equipped with
EC Motors, please
refer to “EC Motor Supple-
mental Manual” for more
detail.
Use conduit, strain reliefs,
etc. as required by code to
secure the field wiring.
Follow these steps:
1. Confirm the voltage of the power supply matches the unit.
2. Remove both unit access panels, i.e., the larger motor door and small filter door.
3. Remove electrical box cover by removing two or three screws. Connect the units power field
wiring to the terminals of the disconnect switch.
4. Connect service ground to ground wire pigtail.
5. Connect the control system to the pigtails in the control voltage compartment of the units
electrical box. Make sure you are connecting the correct voltage, 24 VAC, to the control
pigtails. See Wiring Schematics.
5.3.2 Low Voltage Control System
This ERV is provided with a Class II 24 VAC power supply system that operates the unit’s
contactor for EV450IN. The ERV’s 24 VAC Power Supply can also be used to power the
externally-installed controls system: up to 8 VA of power is available.
The unit’s power supply system includes an isolation relay so you can use external controls
whose contact ratings are as low as 50 mA (1.2 VA). Also, it is possible to operate the isolation
relay with 24 VAC power from an external source (with proper wiring connections).
A built-in circuit-breaker prevents damage to the transformer and other low-voltage components
in the event of a short-circuit or overload. In extreme cases, the transformer itself is designed
to fail safely.
Specifications:
u
Nominal Output Voltage under load: 24 VAC
u
Typical Output Voltage at no load: 29–31 V
u
Minimum contact rating for connected control device: 50 mA (1.2 VA)
u
Circuit Breaker Trip Point: 3 A
Before bringing power to the unit check unit nameplate to confirm it matches the voltage and
phase of the power you are supplying.
Remember that your field connections need to be accessible for inspection.
You must make sure to provide the correct voltage and phase power supply. Installing the
incorrect voltage and phase will destroy the motor and possibly lead to injury!
CAUTION
