LE6XRT ERV
27
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
ELECTRICAL CONNECTIONS
7.3.6 Control with 2 “ON” Signals, External Power
Use the following schematic if the controller is sending two 24 VAC “ON” signals from an external
power source.
• Verify there is NO jumper between terminals 2 and 3.
• Apply one 24 VAC signal to terminals 3 and 4 to operate the isolation relay for the FA blower.
• Apply the second 24 VAC signal to terminals 3 and 5 to operate the isolation relay for the EA
blower.
• Verify that the polarity of each wire connected to terminal 3 is the same.
7.4 SEQUENCE OF OPERATION
Control with 2 Non-Powered Relay Contacts
Control with 2 “ON” Signals, External Power
Basic Sequence of Operation (SOO)
Operating sequences are different, depending on whether the unit is:
• Controlled for simultaneous blower operation, as in Sections 7.3.1 through 7.3.4 in this manual, or
controlled for independent blower operation, as Sections 7.3.5 and 7.3.6.
• Factory-provided with OA - FA Damper, EA - RA Damper, or both;
• Factory-provided with VFD control of one or both motors.
• Simultaneous or Independent Blower Operation:
When set up for Simultaneous Blower Operation, both blowers should respond to a call for unit
operation at the same time, unless only one of the blowers is controlled by a VFD or unless only one of
the blowers is in an airstream with a Damper.
When set up for Independent Blower Operation, each blower will follow an independent operating
sequence.
