Water Furnace SAH Series Installation Manual page 8

SAH AIR HANDLER INSTALLATION MANUAL
General Installation Information cont.
Condensate Drain
To facilitate complete condensate removal, the air handler
should be mounted level or slightly pitched toward the
drain. The drain line contains cold water and should be
insulated in unconditioned spaces to avoid drain line
condensation from dripping on ceiling, etc. The drain pan
has a primary and secondary drain connection. The air
handler drain connections must be connected to a drain
line and pitched away from the unit a minimum of 1/8" per
foot to allow the condensate to flow away from the air
handler. A trap must be installed in the drain line below
the bottom of the drain pan to ensure free condensate flow
(units are not internally trapped). The primary condensate
drain must be terminated to an open drain or sump. Do not
connect the condensate drain to a closed waste system.
An open vertical air vent should be installed to overcome
line length, friction and static pressure. It is recommended
that the secondary drain be connected to a drain line for all
units. The secondary drain should be run to an area where
the homeowner will notice it draining which means that
the primary drain is blocked. The drain line should not be
smaller than the drain connection at the condensate pan.
If the air handler is located in an unconditioned space,
water in the trap may freeze. Since the air handler is under
negative pressure it is recommended to prime the traps
so air is not drawn through the condensate drain. It is
recommended that the trap material be of a type that will
allow for expansion of water when it freezes. All unused
drain ports should be capped. Drain lines must be in
conformance with local codes.
CAUTION: Threaded drain connection should be
hand-tightened, plus no more than 1/16 turn.
The drain pan connections are designed to ASTM Standard
D 2466 Schedule 40. Use 3/4" PVC or non-corrosive metal
threaded pipe. Since the drains are not subject to any
pressure it is not necessary to use Schedule 40 pipe for
drain lines.
3/4" PVC
NPT FITTING
1.5"
Air Handler Configuration
The Air Handler is factory configured for upflow and
horizontal right hand air discharge installation. For
bottomflow or horizontal right hand discharge, certain field
modifications are required.
Warning: Do not lift or reposition the 'A' coil by grasping
the almuminum tube header or distributor. This could
cause a tubing fracture resulting in a refrigerant leak.
8
Vent
3/4" PVC
1/8" per foot
3.0"