Sterling MS - Manual (Page 5)

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SUSPENSION/RIGGING
Make certain that the structure
to which the single, dual, triple furnace and air
handler sections is to be mounted is capable of
supporting its weight. Under no circumstances
must the gas lines, the venting system or the
electrical conduit be used to support the heater;
or should any other objects (i.e. ladder, person)
lean against the heater, gas lines, venting system
or the electrical conduit for support.
The unit should never be lifted
by any unit component other than the base rail
assembly. Unit components other than base rail
assembly are not designed to support the total
weight and may break, causing personal injury
or unit damage.
Units can be set on field furnished supports/cradle
with access available to furnace bottom section, or
suspended by rod hangers from the sub-frame (and
lifting brackets).
Any unit that has a side base rail
longer than 104" (2.6m) requires additional fi eld
furnished supports by a qualifi ed installer. Refer
to all dimensional data in this manual. If further
information is required, contact the manufacturer’s
technical service department.
The unit must be hung level from side to side and front
to back. It is recommended to use the (9/16" diameter)
hanging holes in the skid rail, and 1/2" threaded rod or
pipe, and/or whatever other supports may be required
to adequately support the unit. A fi eld supplied cradle
or other means of support may also be required. The
installer is responsible for determining adequate and
safe suspension methods.
Rig unit using either belt or cable slings. Use spreader bars
to protect the top of the unit when it is lifted. Make sure all
hardware used in the lifting/mounting process is tightened
and secured.
Refer to Figures 1 and 2 for Single Furnace Make-Up
Air Unit rigging requirements. Refer to Figures 3, 4
and 5 for Dual/Triple Furnace Make-Up Air Unit rigging
requirements, which ships to the site in two sections
(Figure 3 is the air handler section and 4 and 5 are the
furnace sections.).
On units with a total length of less than 104" (2642mm),
excluding evaporative cooler, two holes are provided in
the base rail on each side of the unit. Slide pipes beneath
the unit through these holes and attach rigging to pipes
for lifting the unit.
On units with a total length of a 104" (2642mm) or greater,
excluding evaporative cooler, lifting lugs/brackets
attached to the base rail are provided. Once the unit
is set in place these lifting brackets may be removed if
required.
Attach rigging to lugs/brackets for lifting the unit. For
distance between lifting lugs/brackets and total unit
lengths, refer to the Dimensional Data section of this
manual.