Instruction Manual

507792-01G / 31-5000700Issue 2217Page 6 of 8
Sealing Ducts
Ensure that the duct is secured and all joints are properly
sealed to the coil cabinet anges.
There must be an airtight seal between the bottom of
the furnace and the return air plenum. Use berglass
sealing strips, caulking, or equivalent sealing method
between the plenum and the air handler cabinet to
ensure a tight seal. Return air must not be drawn from a
room where the air handler or any gas-fueled appliance
(i.e., water heater), or carbon monoxide-producing
device (i.e., wood replace) is installed.
WARNING
DUCT SYSTEM SIZING - The duct system should be
properly sized and installed according to the ASHRAE
Standard Manual D. The supply and return air duct
systems should be designed for the cfm and static
requirements of the job. Consult the blower performance
chart in the unit installation instructions to verify that the
blower meets the application requirements.
IMPORTANT
Condensate Drain Connections
Main Drain
Connect the main drain and route drain tubing downward to
drain line or sump. Do not connect drain to a closed waste
system. See Figure 7 for typical drain trap conguration.
Overow Drain
It is recommended that the overow drain stub be connected
to an overow drain line for all units. If the overow drain is
not connected to a drain line, it must be plugged with the
provided cap.
After removal of drain pan plug(s), check drain hole(s)
to verify that drain opening is fully open and free of any
debris. Also check to make sure that no debris has
fallen into the drain pan during installation that may plug
up the drain opening.
IMPORTANT
Condensate Drain Recommendations
The following practices are recommended to ensure better
condensate removal:
• Main and overow drain lines should NOT be smaller
than both drain connections at drain pan.
• Overow drain line should run to an area where
homeowner will notice drainage.
• It is recommended that the overow drain line be
vented and a trap installed. Refer to local codes.
Blower Speed Selection
LEFT-HAND AIR
DISCHARGE (TOP VIEW)
TEST HOLES
AIR FLOW
Figure 6. Static Pressure Test
Cabinet
Vol: CFM
Drop: in. w.g.
Model Width in. Dry Wet
24A 14-1/2 800 .16 .18
24B 17-1/2 800 .16 .18
30A 14-1/2 1000 .18 .20
30B 17-1/2 1000 .18 .20
36A 14-1/2 1200 .27 .30
36B 17-1/2 1200 .17 .21
48B
17-1/2 1400 .23 .24
17-1/2 1600 .30 .31
48C
21 1400 .13 .16
21 1600 .16 .20
49C 21 1600 .17 .22
5060C 21 1600 .23 .29
60C 21 2000 .29 .34
60D 24-1/2 2000 .21 .27
Table 2. Air Volume / Static Pressure Drop Across Coil