LE6XRT ERV
23
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
ELECTRICAL CONNECTIONS
24 VAC Power Supply Transformer
6.6 CONTROL CONNECTIONS
7.1 24 VAC CLASS II POWER SUPPLY
Control wiring is to enter the E-Box through a knockout at the bottom of the E-Box and is then terminated
on the low voltage terminal strip.
See Section 6.5 Wiring Schematics
for further information.
7.0 CONTROL CONTRACTOR INFORMATION
Prior to connection and activation of any external controls, the ERV is to be tested for correct opera-
tion. Verify that all Pre Start-Up and Start-Up steps as described in Sections 8 and 9 of this manual
have been completed.
This unit is equipped with a Class II 24 VAC power supply transformer (see image below) that operates
the unit’s contactors, dampers and / or relays. The ERV’s 24 VAC, 75VA power supply can also be used
to power externally installed control systems requiring less than 8 VA of power. More power may be
available on units not equipped with factory-installed dampers. The transformer is located in the unit’s
E-Box.
The unit’s power supply system includes isolation relays with contact ratings as low as 50 mA (1.2 VA).
It is also possible to operate the isolation relays with 24 VAC power from an external source.
A built-in circuit breaker on the 24 VAC transformer prevents damage to the transformer and other low
voltage components in the event of a short-circuit or overload. The transformer itself is designed to fail
safely in extreme cases.
Circuit Breaker
Reset Button
Transformer Specifications:
Nominal output voltage under load: 24 VAC
Typical output voltage at no load: 29 - 31 V
Minimum contact rating for connected control device: 50 mA (1.2 VA)
Circuit breaker trip point: 3.75 A
Limits of Class II Power Output:
Control devices drawing a total of 8 VA may be connected to the blue and red wires. More than one
device may be connected. Observe the following wire guidelines:
Wire
Gauge #22 #20 #18 #16 #14 #12
Circuit
Length 100’ 150’ 250’ 400’ 700’ 1000’
Resetting the Circuit Breaker:
If the transformer is subjected to excessive load or a short circuit, the integral circuit breaker will trip.
Shut off the primary-side power to the unit and remove the excessive load or the short circuit. The
circuit breaker can be reset about 15 seconds after it trips.
