M-Series Technical Manual
11
Cambridge Air Solutions
INSTALLATION INSTRUCTIONS
HORIZONTAL MOUNT - ROOF TOP CONFIGURATION
WARNING:
Due to the size and weight of this equipment, it is
recommended that the heater support structure be
reviewed and approved by a qualified structural
engineer and the roof manufacturer before installing
this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect
to accessibility to the equipment for service and
maintenance functions.
IMPORTANT
To minimize snow and rain ingestion, position the heater
inlet opposite the prevailing wind.
CAUTION:
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local
codes for applicable building code provisions for
ventilation air.
IMPORTANT
For model M140 heaters, refer to the “Field Assembly
Instructions” worksheets included with this manual
and with the components for detailed heater assembly
directions.
1. Prepare the roof for installation. (See pages 10-12
for roof opening dimensions for your specific
heater.) The gas and electrical connections must not
penetrate the unit base or mounting curb. Cambridge
Air Solutions recommends using pitch pockets or
roof boots to seal the penetrations.
IMPORTANT
Accurate measurements are critical and will affect
installation process.
2. Assemble and secure the roof curb to the support
structure per the recommendations of the structural
engineer and roof manufacturer.
IMPORTANT
The roof curb or support structure should be installed
such that the heater will sit level. Cambridge Air
Solutions recommends mounting the heater 24" off the
roof surface in areas where snow accumulation could
impact heater operation.
3. Install the roof curb gasket seal. See drawing on
page 8.
4. Lower the discharge duct through the roof opening.
5. Use a crane or comparable lifting device to raise
and position the equipment. Use a spreader bar to
prevent damage and connect slings to the lifting
eyes.
6. Caulk all joints of the heater’s accessories installed
in the field. Use a clear or gray silicone caulking to
prevent water leaks.
7. Seal all roof penetrations to prevent roof leaks.
8. Install the discharge accessory, where used, by
screwing the plenum to the discharge duct. Install
4 hanging rods from the ceiling supports to the
accessory’s support brackets.
9. Adjust internal vibration isolators, if applicable, per
the setup instructions provided with this manual.
