4
Installation with Horizontal Discharge
Step 1 Install Curb/Supports
See pgs 22-24 for curb dimensions. Unit may also
be placed on equipment supports as long as they
provide ample support for the unit.
NOTE: An equipment support is required under the
cooling/filter section if the unit has cooling. See
submittals or consult factory for placement of
support.
Step 2 Install Unit
Use a crane and spreader bar to lift unit onto
equipment supports or curb. NOTE: Use ALL lifting
lugs on unit. See pgs 22-24 for lifting lug locations.
Step 4 Mount Discharge Stat/Sensor
The discharge sensor will need to be mounted in the
ductwork down stream of the unit. Make sure to note
the airflow direction labeled on the mixing tube (elec
mod only). Wiring from the duct stat to the amplifier
must be in separate conduit or in shielded cable if
being run with other power wires. See the wiring
diagram provided with the unit. The duct stat should be
placed down stream where there is good air mixture
and where it is away from dead spots in the ductwork.
Sometimes this can only be done through trial and
error. Too far from the unit may cause delay problems.
The duct stat should be mounted where it is shielded
from the weather (elec mod only).
Step 3 Attach Ductwork to
Unit Discharge
See pgs 22-24 for discharge dimensions.
Greenheck recommends attaching ductwork to
collar using a rubber duct section at the unit to
eliminate vibration. Follow the furnace
manufacturer’s recommendation for proper duct
work methods for transitions after the unit.
Before beginning this installation:
Make sure that there is room to access the unit from all
sides. The inlet must be located at least 10 feet away
from any exhaust vents.
This unit has a 6" clearance tolerance from the rear and
a 24” clearance tolerance from the sides to any
combustibles.
A 48” clearance on the burner control side is
recommended for service and removal of the burner.
Units are for outdoor installation only!
Duct
Duct Stat
Mixing Tube
Meta
Equipment
Support
Roof Curb
Duct Stat
Duct
Air Flow
Electronic Modulation
Stage Control
