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SUPPLY
AIR
SERVICE
PLATFORM
CEILING
JOISTS
AIR HANDLER SUPPORTS
(FIELD SUPPLIED)
AUXILIARY DRAIN PAN
(FIELD FABRICATED)
P-TRAP
PRIMARY
DRAIN LINE
RETURN AIR
AUXILIARY
DRAIN LINE
Horizontal Installation
Horizontal Application
This type of position is usually used in an attic or crawl space. The air
handler may be laid on the left or right side for horizontal applications.
The factory-installed coil is intended for left-side-down installation.
This type of installation requires a return air duct to be attached to the
air handler inlet. The opposite end of the return air duct is then routed
to a return air grille mounted to the ceiling or wall. This duct MUST be
no smaller than the inlet opening of the air handler.
For Horizontal Right Application:
1. Remove front panels from the air handler.
2. Remove coil assembly from the air handler.
3. Remove horizontal drain pan from left hand side of air handler and
re-install on right hand side. Change splash baffle location from left
hand to right hand side of drain pan flange.
4. Remove the horizontal coil support bracket from the right hand side
of the air handler.
5. Reinstall coil assembly in the air handler.
6. Reattach coil support bracket to the left hand side of the air
handler.
7. Replace front panels.
CAUTION
Horizontal applications in unconditioned areas, such
as attics above a ceiling, require special
precautionary measures. An auxiliary drain pan
having at least two inches overall clearance around
the unit MUST be field-fabricated and installed as
shown below.
The drain outlet and drain line for the auxiliary
drain pan need not be trapped but should be sloped
to a suitable drain.
CAUTION
For optimum condensate drainage performance in
horizontal installations, unit should be leveled
along the length and width. Failure to follow this
caution may result in product or property damage.
CAUTION
A P-type trap must be installed in the primary drain
line as shown in figure 3 below.
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