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3.2 VERTICAL UPFLOW AND HORIZONTAL LEFT
The air handler unit is factory shipped for vertical upflow and horizontal left application.
• If return air is to be ducted, install duct flush with floor. Use fireproof resilient gasket 1/8
to 1/4 in. thick between duct, unit and floor. Set unit on floor over opening.
• Support along the length of the unit, on all units installed horizontally. Do not support
or suspend unit from both ends without support in the center of the cabinet. If unit is
to be supported or suspended from corners, run two reinforcing rails length of unit
and support or suspend from reinforcing rails.
• Secondary drain pan kits RXBM- are required when the unit is configured for the hori-
zontal left position over a finished ceiling and/or living space. (See Section 16.0:
Accessories - Kits - Parts.)
FIGURE 5
VERTICAL DOWNFLOW & HORIZONTAL RIGHT APPLICATIONS
RAILS
RAILS
CAUTION
Horizontal units must be configured for right hand air supply. Horizontal drain
pan must be located under indoor coil. Failure to use the drain pan can result
in property damage.
3.3 VERTICAL DOWNFLOW AND HORIZONTAL RIGHT
Conversion to Vertical Downflow/Horizontal Right: A vertical upflow unit may be con-
verted to vertical downflow/horizontal right. (See Figure 5.) Remove the door and indoor
coil.
IMPORTANT: To comply with certification agencies and the National Electric Code for
horizontal right application, the circuit breaker(s) on field-installed electric heater kits
must be re-installed per procedure below so that the breaker switch "on" position and
marking is up and, "off" position and marking is down.
- To turn breaker(s): Rotate one breaker pair (circuit) at a time starting with the one on the
right. Loosen both lugs on the load side of the breaker. Wires are bundles with wire ties,
one bundle going to the right lug and one bundle going to the left lug.
- Using a screwdriver or pencil, lift white plastic tab with hole away from breaker until
breaker releases from mounting opening (see Figure 6).
- With breaker held in hand, rotate breaker so that "on" position is up, "off" position is down
with unit in planned vertical mounting position. Insert right wire bundle into top right
breaker lug, ensuring all strands of all wires are inserted fully into lug, and no wire insula-
tion is in lug.
DETAIL A
ENSURE THE RETAIN-
ING CHANNEL IS FULLY
ENGAGED WITH THE
COIL RAIL.
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