Greenheck ERCH Installation, Operation And Maintenance Manual page 13

Unit Installation
Roof Curb Mounting
Rooftop units require curbs to be mounted first. The
duct connections must be located so they will be clear
of structural members of the building.
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.
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.
1. Factory-Supplied Roof Curbs: Roof curbs are
Model GKD, which are shipped in a knockdown kit
(includes duct adapter) and require field assembly
(by others). Assembly instructions are included with
the curb.
2. Install Curb: Locate curb over
roof opening and fasten
ERCH
in place. Reference
Installation, Curb
Outside Dimensions,
Recommended
Roof Openings
and Weights in this
manual. Check
that the diagonal
dimensions are within
±1/8 inch of each
other and adjust as
necessary. For proper
Exhaust Blower
Access Door
coil drainage and
unit operation, it is
Outdoor Air
Weatherhood
important that the
installation be level.
Shim as required to
level.
3. Install Ductwork: Installation of all ducts should
be done in accordance with SMACNA and AMCA
guidelines. Duct adapter provided to support ducts
prior to setting the unit.
4. Set the Unit: Lift unit to a point directly above the
curb and duct openings. Guide unit while lowering
to align with duct openings. Roof curbs fit inside the
unit base. Make sure the unit is properly seated on
the curb and is level. Gasketing (by others) needs
to be installed to curb creating a seal between the
ductwork and the base of the unit.
5. Install Vestibule: If unit was ordered with a vestibule
and it has not yet been attached to the unit, caulk
and attach the vestibule at this time.
®
Supply Blower
Access Door
Drain Pan
Connection
Piping
Cassette/Filter Vestibule
Access Door
Optional Piping Vestibule
Insulated enclosure that is mounted externally to the
unit in order to protect the water supply and return
piping. Not available in models with water-source heat
pump or evaporative cooling.
ERCH
Exhaust Blower
Access Door
Outdoor Air
Weatherhood
Cooling Coil (with or without heating)
Exhaust Blower
Access Door
Outdoor Air
Weatherhood
Heating Only
Unit Size Heating Only
ERCH-20
ERCH-45
ERCH-55
ERCH-90
All weights are in pounds.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific
Supply Blower
Access Door
Drain Pan
Connection
Piping
Cassette/Filter Vestibule
Access Door
Supply Blower
Access Door
Piping
Cassette/Filter
Vestibule
Access Door
Configuration
Cooling Coil
130 190
160 225
160 225
190 265
E
A
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