AAON SB-018 - Manual (Page 23)

23
Piping systems should not exceed 10 ft/sec
fluid velocity to ensure tube wall integrity
and reduce noise.
Electrical
Verify the unit nameplate agrees with power
supply. SB Series units are provided with
single point power wiring connections.
Connection terminations are made to the
main terminal block. A complete set of unit
specific wiring diagrams, showing factory
and field wiring are laminated in plastic and
located inside the controls compartment
door.
All units require field supplied electrical
overcurrent and short circuit protection.
Device must not be sized larger than the
Maximum Overcurrent Protection (MOP)
shown on the unit nameplate.
Codes may require a disconnect switch be
within sight of the unit.
It is recommended that the field installed
overcurrent protection or disconnect switch
not be installed on the unit.
Electrical supply can enter through the
bottom or side of the controls compartment.
Entry must be field cut into panels of the
unit.
A single point connection to a terminal
block is provided. Split units may require
connection between the units. High voltage
conductors should enter the control panel in
a separate opening and separate conduit than
24V low voltage conductors.
Note: Locations for field cut electrical
entries are marked on the unit. Field cut
openings must be a minimum of 6 inches
away from all components and wiring to
prevent damage due to drilling or cutting.
To pass wires through the wall or roof of the
unit, a hole should be cut and conduit passed
through it. Use the following procedure to
cut a round hole in a foam panel.
Cutting Electrical Openings
1. Locate the placement of the hole. Be sure
that the conduit will not interfere with the
operation of any component or prevent
access of any door or removable panel.
2. Drill a pilot hole all the way through the
foam panel.
3. Using a hole saw cut the hole through the
metal on both sides of the foam part.
4. With a knife cut the foam out of the hole.
5. After the conduit is installed in the hole
caulk the entire perimeter of the hole on
both sides with an industrial grade silicone
sealant or a duct seal compound.
If a larger cut-out is needed for additional
duct connections not provided by the
factory, or for any other reason, it is very
important that the foam be completely
sealed. Insulation covers should be
fabricated from sheet metal to cover the
The foam insulation releases
dangerous fumes when it is burnt. Do
not cut a foam part with a cutting
torch or plasma cutter. Do not weld to
a foam filled part.
WARNING
Disconnect all electrical power
sources before servicing the unit.
More than one power source may be
provided. Failure to do so may result
in injury or death from electrical
shock or entanglement in moving
parts.
WARNING