ERV
HE2XRT
15
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
MOTOR STARTERS
This unit uses IEC-style motor starters to protect the motors against overload.
IEC-style motor starters use Overload Relays to detect excessive current and interrupt the control circuit
that engages the motor’s contactors.
Overload Relays are sized to Full Load Amp (FLA)
rating of the protected motor. The Overload Relays
can be adjusted to trip (interrupt the control circuit)
at a specific setting within a range.
Overload Relays should initially be set at the FLA
rating of the motor (see Unit Rating Label). If
necessary to prevent nuisance tripping at start-up,
the Relays can be adjusted to trip no higher than
115% of the motor’s FLA rating.
For safest operation, the overload relays should also
be used in manual reset mode with trip test capability.
NOTE:
As factory-wired, if one blower motor is shut
down due to overload by its Motor Starter, the other
motor will also be shut down.
NOTE:
Terminals 96 & 97 of the Overload Relays and
terminals 14 & 13 of the Contactors are normally-
open dry contacts that may be used to signal that
the contactors are closed and/or that the Overload
Relays have tripped.
OPERATION
The Overload Relay output contacts 95 & 96 must remain in series with the low-voltage control circuit!
Altering this will create a hazardous situation in which the motor is not protected against overload!
Adhere to applicable local codes when adjusting the dial setting of the overload relays.
DANGER OF INJURY OR DAMAGE.
The motors in this unit must not be run at an amperage that exceeds the motor’s rated full load amps and
overload relays on the motor starters must be set at or below motor full load amps. For safest operation, the
overload relays should also be used in hand reset mode with trip test capability.
It is the installer’s responsibility to measure the operating amperage of each motor. If the full load amp
rating is exceeded, the amp draw must be reduced by substituting a smaller motor pulley or by adjusting
the variable sheave. Continue these adjustments until the actual amperage is no more than the motor’s
faceplate full load amps.
Failure to make this adjustment may result in unsafe motor winding temperatures or tripping of the supplied
motor starter’s overload relay motor protection devices set at full load amps.
DANGER OF INJURY
OR DAMAGE.
The relay must be set for correct
FLA rating depending on the
motor horsepower. See Unit
Rating Label on motor for HP and
FLA specifications.
WARNING
WARNING
WARNING
START-UP & OPERATION
