LE6XRT ERV
RENEWAIRE.COM
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
1.800.627.4499
24
ELECTRICAL CONNECTIONS
RISK OF DAMAGE TO POWER SUPPLY AND CONNECTED COMPONENTS
UNITS WITH 230 VAC POWER SOURCE:
The ERV is shipped from the factory with the transformer set for 208 VAC primary power. If the
actual power source is 230 VAC, move the black primary-side lead from the transformer’s “208
V” terminal to the transformer’s “230 V” terminal.
Connect only to components intended for use with a 24 VAC power supply.
Do not interconnect the unit’s Class II power supply with an external Class II power supply.
Do not use undersized low voltage wiring to connect this device. Observe the wire gauge / wire
length chart on the previous page.
Do not overload the power supply. Verify that the combined load of all devices connected to the
power supply do not exceed 8 VA.
Any external 24 VAC power supply connected to this device must be connected to the terminals as
shown on the wiring schematics. Connect only Class II power to the terminals on this unit.
This unit is not designed to accept analog control signals unless the unit is equipped with Integrat-
ed Microprocessor controls and/or VFDs.
This unit is not designed to communicate directly with a Building Management System (BMS) such
as BACnet unless the unit is equipped with microprocessor controls. The unit can be controlled by
powered or non-powered contacts operated by any kind of control system.
Units that are equipped with VFDs or optional Integrated Microprocessor Controls can communi-
cate directly with BACnet systems.
7.2 MOTOR PROTECTION
7.2.1 Units Equipped with Motor Starters
Units that are not equipped with optional VFD drives are supplied with IEC-style motor starters to
operate the motors and to protect the motors against overload. IEC-style motor starters use overload
relays (see image on following page) to detect excessive current and interrupt the control circuit that
engages the motor’s contactors.
The overload relays are sized to Full Load Amp (FLA) rating of the protected motor and can be adjusted
to trip the control circuit at a specific setting within a range. Overload relays should initially be set at
the FLA rating of the controlled motor. See the unit rating label. If the overload relays trip at unit start-
up, they can be adjusted to trip at no higher than 115% of the motor’s FLA rating.
NOTE: Units are factory-wired so that if one blower motor is shut down due to starter overload, the
second motor will also be shut down.
Terminals 96 and 97 on the overload relays and terminals 14 and 13 of the contactors are Normally
Open (NO) dry contacts and may be used to signal that the contactors are closed and / or that the
overload relays have tripped.
CAUTION
