Bard QH243 User Manual download pdf (Page 12)

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D Series Options

Electrical Disconnects

Factory installed electrical disconnects are available for all D Series ERV units.

Disconnects are sized to meet the power requirements of the system and are

available either fused or non-fused. The rotary disconnect knob is externally

mounted for remote operation of the switch with the access panels in place.

Occupancy Timers

For those applications where the D Series ERV is to be operated based on occupancy

or on a time and day basis, a programmable control timer is available. The digital

control timer is internally mounted and can be programmed with a 7-day cycle and

up to 10 on/off cycles per day.

Anchor Straps 

Anchor straps constructed of 14 gauge

galvanized steel and pre-drilled for 1/4”

mounting hardware are available to

secure rooftop units to their curbs.

Variable Frequency Drives (VFD)

The D Series ERV units allow a VFD to be

added to the unit to control the speed of

the either or both motor/fan assemblies.

The drive unit is mounted internally and

the keypad is available either internally

mounted or external mounted.

Vertical Electrical Connections

For those applications where the project

does not want electrical wiring external

to the unit, the D Series ERV units have an option to have the wiring provided

through the floor of the box and then into the facility through the curb.

Insect Screens

D Series ERV units are available with a high density aluminum mesh screen mounted

at the entrance to the supply hood to prevent most insects from entering the unit.

The screens also provide increased protection against rain ingestion in the highest-

intensity storms.

“Mirror Image” Duct Openings

Units with standard ducts and without internal fans can be built with the usual

arrangement of openings and panels reversed to create a “mirror image” design to

better fit space constraints. See page 15 for more details.

Anchor Strap

Base Rail

Curb

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Bard QH243 User Manual Page 12