Filter
Top Products
4
Model ERV Energy Recovery Unit
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 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
U
V
0.50
0.50
ERV-251, 361, 521 and 581
U
U
V
V
EXHAUST
INLET
EXHAUST
INLET
SUPPLY
DISCHARGE
SUPPLY
OUTLET
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.
Unit Size U V
ERV-251 26.5 20
ERV-361 43 26
ERV-521 58 35
ERV-581 60 30
ERV-522 62 36
ERV-582 77 38
All dimensions are in inches.