LE6XRT ERV
RENEWAIRE.COM
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
1.800.627.4499
14
COMPONENT DESCRIPTION
2.7.2 Variable Frequency Drive
2.8 OPTIONAL CONTROL ACCESSORIES
2.8.2 Digital Time Clock
2.8.1 Carbon Dioxide Control
A digital time clock is offered as an optional control device. It is available in either a panel mount or an
exterior enclosure. Time clocks can be wired directly to the low voltage terminal strip and function as
ON/OFF switching controllers. The time clock draws 2.4 VA.
RenewAire offers two different types of CO2 sensors as optional control accessories: room/wall mount
and duct mount. These sensors can be wired directly to the low-voltage terminal strip and function
as ON/OFF switching controllers or can modulate ERVs equipped with VFDs. See the description in
Section 2.7 Controls. The CO2 sensor uses 4.44 VA.
Carbon Dioxide Sensor, Room/Wall Mount
Time Clock, Panel Mount
Time Clock, Exterior Enclosure
Time Clock, Exterior
Carbon Dioxide Sensor, Duct Mount
RenewAire offers a number of control accessories as options that are to be field-installed and wired
directly to the ERV low voltage terminal strip. When wired to the ERV low voltage terminal strip, each
device functions as an ON/OFF switch for the ERV but they will not modulate the ERV. All of the optional
control accessories shown in this section may also be ordered as part of an integrated microprocessor
controls package. If they are ordered as part of a controls package, they are to be wired according to
instructions provided with the Integrated Microprocessor Controls package. When they are used as
part of a controls package, they will modulate the ERV or function as ON/OFF devices, depending on
user programming.
VFDs Mounted Inside ERV
VFD Keypads Found in E-Box
Optional VFD control of the fans provides continuous modulation of fan speed. VFDs can be ordered for
either the EA or the FA fan, or for both. The VFDs can be used as stand-alone speed controllers or they
can be used in conjunction with either a BMS or with the Integrated Microprocessor Controls package.
See digit 19 of the Configuration Code.
Any fan motor that
is controlled by a
VFD will have a fixed
sheave instead of a
variable sheave.
Further information
on the optional VFDs
is to be found in the
VFD manual supplied
with the unit. If optional mi-
croprocessor controls are
also ordered, the VFD man-
ual is not included.
Time clocks are typ-
ically not used when
VFDs are installed.
VFDs have an internal
time clock.
