U
NIT
M
OUNTING
Install unit heaters to meet Occupational
Safety and Health Act (OSHA). Unit heaters
mounted less than 8 feet (2.4 meters) above
the floor must be equipped with a fan guard.
Ensure that all hardware used in the
suspension of each unit heater is more than
adequate. Failure to do so may result in
extensive property damage, severe personal
injury, or death.
Suspension nuts are provided on the top of
all models. Support rods should be installed
so that they support the total weight of the
unit heater to assure that no strain is placed
on the supply and return piping. Provisions
for removal of the unit from the suspension
rods may be desirable for future servicing.
Otherwise, the provision of sufficient
clearance around the unit heater for future
maintenance and servicing is required.
Note:
Increasing clearance distances may
be necessary if there is any possibility of
distortion or discoloration of adjacent
materials.
It is assumed that the type of system to be
used has been selected by the design
engineer. The diagrams shown in the
manual are for different types of steam or
hot water systems.
It is important that the system be kept clean
and free of foreign substances, such as
excessive joint materials, etc.
For steam systems it is recommended that
the unit be mounted level for proper
condensate drainage. Swing joints should be
used in piping, and piping should be pitched
down so condensate can drain freely.
Isolators are not required, but may be
desirable for some applications. Refer to
dimensional drawings for unit weights.
Hanging hardware is not included with the
unit (to be field supplied).
Place unit heaters at points of greatest heat
loss. Blanket outside doorways and provide
ample coverage of window areas. Keep the
unit heaters away from objects that will
impede the full and natural air delivery of the
units.
P
IPING
Refer to the appropriate model dimensional
drawing to determine the piping connection
type, size, and location. Follow standard
practices and codes when installing piping.
Provide swing joints for expansion purposes,
unions and shut-off valves for servicing
purposes, as well as valves and traps for
control purposes. Refer to Typical Piping
Connections Diagrams for details.
Unit Heaters
Installation & Operation Manual
2
www.sigmaproducts.com Tel: (905) 453-0446 Fax: (905) 453-0675
Rev 2
Important:
Unit heaters must be hung
level from side to side, and front to back.
Failure to do so will result in poor
performance and/or premature failure of
the unit.
