ERV
HE2XRT
11
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
INSTALLATION INSTRUCTION
INSTALLATION
HOW TO RESET THE 24VAC CIRCUIT BREAKER
If the transformer is subjected to an excessive
load or a short circuit, the circuit breaker will trip
to prevent the failure of the transformer. When it
trips the circuit breaker’s button pops up. Shut off
the primary-side power to the unit, and remove
the excessive load or the short. The circuit breaker
can be reset about fifteen seconds after it trips by
pressing in the button.
LIMITS OF POWER OUTPUT
If limits on wire gauge and length are observed,
you may connect control devices that draw up
to 8VA to the blue and red wires. More than one
device can be connected as long as total steady-
state load does not exceed 8VA.
LOW VOLTAGE CONTROL SYSTEM
This ERV is provided with a Class II 24VAC power
supply system that operates the unit’s contactors.
The ERV’s 24VAC Power Supply can also be used
to power the externally-installed controls system:
up to 8VA of power is available.
The unit’s power supply system includes isolation
relays so you can use external controls whose
contact ratings are as low as 50mA (1.2VA). Also,
it is possible to operate the isolation relays with
24VAC 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
•
Nominal Output Voltage under load: 24VAC
•
Typical Output Voltage at no load: 29-31V
•
Minimum contact rating for connected control
device: 50mA (1.2VA)
•
Circuit Breaker Trip Point: 3A
1. Connect only to components intended for use with 24VAC power.
2. Do not undersize the low-voltage wires connected to this device. Observe the wire length and gauge
limits indicated in this manual.
3. Do not overload this unit’s 24VAC power supply system. Confirm that the power requirements of
devices you connect to this power supply system do not exceed 8VA in total.
4. If an external source of 24VAC power is used to control the unit, consult the wiring schematics and
connect the external power only to the specified terminals in order to avoid damaging the unit or
external controls. Connect only CLASS II power to the control terminals of this unit.
5. Unit is not equipped to receive analog signals (such as 1-10vdc or 4-20mA).
6. Unit is not equipped to communicate directly with Building Management Systems (such as BACNET,
LONWORKS, etc.). However, the unit can be controlled by powered or non-powered contacts operated
by any kind of control system.
CAUTION
OBSERVE THESE LIMITS TO WIRE LENGTH AND GAUGE
in order to ensure reliable operation of the control system.
Wire Gauge
#22
#20
#18
#16
#14
#12
Circuit Length
100'
150'
250'
400'
700'
1000'
“Circuit Length” is distance from ERV to Control Device.
If primary-side voltage is 230VAC,
move black primary-side lead from
transformer’s “208V” terminal to
the transformer’s terminal marked
“240V” (“230V” in some units).
Do not move the black primary-
side lead that is connected to the
transformer’s “COM” terminal.
INSTALLATION NOTES
