13
Through-the-Floor Return Air System
(Ducted)
1. Prepare Floor Opening(s):
a. Mark floor openings as shown in Figure 5 (page
9). Provide minimum clearances at rear and left
side walls of closet for installation of furnace and
wiring.
b. Cut floor opening on outside edge of marked line
so that opening is slightly larger than area marked.
c. Additional provisions may be necessary for optional
air conditioning if refrigerant lines are installed other
than at the front of the furnace.
2. If return air duct is made of combustible material, locate
a pan fabricated of non-combustible material with 1”
upturned flanges under furnace return air opening.
3. Route 240V supply circuit(s) and 24V wiring to closet.
See Figure 20 (page 17) for appropriate locations.
4. Position optional coil cabinet over floor cutout and secure
with three or more fasteners.
5. Position furnace onto coil cabinet and secure with two
or more fasteners.
6. Use optional upflow duct connector or field supplied
connector to attach furnace to overhead supply duct.
See Figure 16.
Figure 16. Over-the-Floor Return Air System with
Upflow Stand
Upflow Duct
Connector
Furnace
Filter
(one obtained
from furnace)
Upflow Stand
ELECTRICAL WIRING
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
power to furnace.
to disconnecting. Reconnect wires correctly.
AVERTISSEMENT:
RISQUE DE CHOC ÉLECTRIQUE,
D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de
sécurité pourrait entraîner un fonctionnement
la mort ou des dommages matériels.
Un entretein incorrect pourrait entraîner un
fonctionnement dangereux de l’appareil, des
matériels
générateur d’air chaud avant de prodéder
aux travaux d’entretein.
S’assurer de les raccorder correctement.
• Electricalconnectionsmustbeincompliancewithall
applicable local codes and the current revision of the
National Electric Code (ANSI/NFPA 70).
• For Canadian installations the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
Line Voltage Wiring
IMPORTANT NOTES
for the control system to operate correctly. Verify
the incoming neutral line is connected to the white
wire and the incoming hot line is connected to the
polarity and ground are properly connected.
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