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Install Condensate Condensate Drain Lines and Drain Trap—Standard Vent/Flue Drain Hose Connections
A condensing gas furnace achieves its high level of efficiency by
extracting almost all of the heat from the products of combustion
and cooling them to the point where condensation takes place.
The condensate which is generated must be piped to an
appropriate drain location.
In upright installations, the furnace's drain hoses may exit either
the right or left side of the furnace.
NOTE: If the alternate vent/flue outlet is utilized in an upright
installation, the drain trap and drain connections must be located
on the right.
In horizontal installations, the drain hoses will exit through the
bottom (down side) of the furnace with the drain trap suspended
beneath the furnace. The field-supplied drain system must be in
accordance with all local codes and the instructions in the
following sections.
NOTES:
The drain trap supplied with the furnace must be used.
The drain line between the furnace and drain location must
be constructed of ³⁄₄" (1.9 cm) PVC or CPVC.
The drain line between the furnace and drain location must
maintain a ¹⁄₄" (6.4 mm) per foot downward slope toward the
drain.
Do not trap the drain line in any other location than at the
drain trap supplied with the furnace.
Do not route the drain line outside where it may freeze.
If the drain line is routed through an area which may see
temperatures near or below freezing, use measures that will
keep the condensate from freezing within the drain line.
If an air conditioning coil is installed with the furnace, a
common drain may be used. An open tee must be installed in
the drain line near the cooling coil to relieve positive air
pressure from the coil's plenum. This is necessary to avoid
any interference with the function of the furnace's drain trap.
Upright Installations
In an upright installation, drain hoses are connected to drain
ports on the rubber elbow and the recuperator coil front cover.
The drain lines are then routed through the right or left side panel
and into the drain trap secured to the outside of the cabinet.
NOTE: For upright installations using an alternate vent/flue outlet,
see "Condensate Drain Lines and Drain Trap—Alternate Vent/
Flue Hose Connections."
Standard Right or Left Side Drain Hose Connections
Upright installations using the standard vent/flue outlet require
the drain hoses to be connected as follows. The following
quantity of hoses, tubes, and hose clamps are provided with the
furnace.
Hose and Tube Identification
D
E
A. Hose A
B. Hose B
C. Tube 2
D. Green hose clamps (3)
A
B
C
F
G
E. Red hose clamp (1)
F. Silver hose clamp (1)
G. Tube 1
1. Remove the rubber plug from the front cover drain port (right
or left side, depending on the intended drain trap mounting).
2. Secure Hose A to the front cover drain port with a red hose
clamp.
3. Route Hose A to the rear side panel grommet hole.
NOTE: For left side drainage, the grommets will have to be
relocated to left side panel.
Upright Standard Connections—Right Side Upflow
(Counterflow Similar)
L
D
A. Right side panel
B. Rubber elbow
C. Rubber elbow drain port
D. Red hose clamps
E. Tube 1
F. Hose B
Upright Standard Connections—Left Side Upflow
(Counterflow Similar)
A
L
D
K
J
I
H
G
A. Left side panel
B. Rubber elbow
C. Rubber elbow drain port
D. Red hose clamps
E. Tube 1
F. Green hose clamps (3)
4. Cut and remove ¹⁄₄" (6.4 cm) from the end of the drain port on
the rubber elbow.
5. Insert Tube 1 into the rubber elbow drain port and secure with
the red hose clamp. Angle Tube 1 outward toward the front of
the furnace.
6. For right side drains, cut 17³⁄₄" (45.1 cm) from the long end of
Hose B and discard.
7. Secure the remaining Hose B to Tube 1 with a green hose
clamp.
8. Route the other end of Hose B to the front right side panel
grommet hole.
A
B
C
D
E
F G
H
K
J
I
G. Side panel grommet holes
H. Tubes 2
I. Drain trap
J. Green hose clamps (3)
K. Hose A
L. Front cover drain port
B
C
D
E
F
G. Hose B
H. Drain trap
I. Tubes 2
J. Side panel drain holes
K. Hose A
L. Front cover drain port
23
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