Lifting, Recommended roof opening – Greenheck Fan 455924 ERV-522 User Manual

Page 4

Energy Recovery Ventilator

Lifting

1. Before lifting, be sure that all shipping material

has been removed from unit.

2. To assist in determining rigging requirements,

weights are shown below.

3. Unit must be lifted by all lifting lugs provided on

base structure.

4. Rigger to use suitable mating hardware to attach

to unit lifting lugs.

5. Spreader bar(s) must span the unit to prevent

damage to the cabinet by the lift cables.

6. Always test-lift the unit to check for proper

balance and rigging before hoisting to desired
location.

7. Never lift units by weatherhoods.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be

completed prior to lifting unit to the roof.

10. Check to be sure that gasketing (supplied by

others) has been applied to the curb prior to
lifting the unit and setting on curb.

11. Do not use fork lifts for handling unit.

Recommended Roof Opening

Unit Weights

Unit Size

Approx. Weight (lbs)*

ERV-251

340

ERV-361

860

ERV-521

1290

ERV-581

1470

ERV-522

3230

ERV-582

3700

*Weight assumes outdoor unit with

filters, weatherhoods and outdoor
air intake damper.

SUPPLY

DISCHARGE

EXHAUST

INTAKE

0.50

ERV-251, 361, 521 and 581

EXHAUST

INLET

SUPPL

DISCHARGE

ERV-522 and 582

Position the unit roof
opening such that the
supply discharge and
exhaust inlet of the
unit will line up with
the corresponding
ductwork. Be sure
to allow for the
recommended service
clearances when
positioning opening
(see Service Clearances). Do not face the outdoor air
intake of the unit into prevailing wind and keep the
intake away from any other exhaust fans. Likewise,
position the exhaust discharge opening away from
outdoor air intakes of any other equipment.

When cutting only duct openings, cut opening 1 inch
(25mm) larger than duct size to allow clearance for
installation. Area enclosed by roof curb must comply
with clearance to combustible materials. If the roof is
constructed of combustible materials, area within the
roof curb must be ventilated, left open, or covered
with non-combustible material which has an “R”
value of at least 5. If area within curb is open, higher
radiated sound levels may result.

Where the supply or warm air duct passes thru a
combustible roof, a clearance of one inch must be
maintained between the outside edges of the duct
and combustible material in accordance with NFPA
Standard 90A.