LENNOX Evaporator Coils Manual L0806273

User Manual: LENNOX LENNOX Evaporator Coils Manual LENNOX Evaporator Coils Owner's Manual, LENNOX Evaporator Coils installation guides

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SUPPLEMENT
_c)2000 Lennox industries

-_puTeC h n i cal
blications

inc.

Dallas, Texas

Litho U.S.A.

SUPPLEMENT
FOR CREATING BLOWOFF SHIELDS AND DUCT FLANGE
FOR CH33 SERIES COILS (LEFT TO RIGHT DISCHARGE)

504,360M

10/2000

Coil Cabinet

Top View
Coil end

This supplement is instructions for field fabrication and
installation of blowoff shields and a duct flange. Use this
supplement with CH33 coils that are installed in the left to
right hand discharge position,
The blowoff shields keep water from the coil inside of the
drain pan. The blowoff shields also protects the duct work
from water.
Right-hand Air Discharge with Connection Duct - The
coil must have a 3/4" slope from the rear of the cabinet
to the drain. The coil must be in the left to right
configuration connection on the service access side of the
furnace. The field-provided connection duct goes between
the furnace and the coil. Field-provided screws secure the
coil casing, connection duct, and the furnace together.

Blowoff Shield:
Insert and rotate it
back and down into
the drain pan

Coil Drain
Pan

Figure 2
Right-hand Air Discharge
Connection
Ducts

Fabricating the Blowoff Shields
1 - Cut light gauge sheet metal into the dimensions shown
in figure 1.
2 - The blowoff shield must have a 90 ° angle where it is
bent. See figure 1.

Blowoff

Shield Dimensions

2-1/2

Cabinet
Flange

(Top View)

with
Blowoff
v

Supply
Duct

in (mm)
\-

(102)
4
furnace
front

-

/

plumbing
connections
connection
duct

Blowoff
Shields

Coil End View
5
(127)

Blowoff
Shield
Figure

Coil End Covers

90 °
angle
1

Installing the Blowoff Shields Inside the Coil Cabinet
1 - Insert the short end of the shields (2.5" 64 mm) into the
space between the cabinet flange and the coil end
covers, See figure 2.
2 - Force the shield down into the corner of the drain pan.
3 - Slope the coil cabinet toward the drain connection. The
slope must be a minimum of 3/4" (19 mm) high, See
figure 3,
10/00

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

_t
drain

Blowoff
Shields

/
slope 3/4"

Figure 3

504,360M

IIIIIllilllllllllillllillllllllii

Fabricating the Duct Flange
1- Cut and bend light gauge sheet metal into the
dimensions shown in figure 4. The flange will be in the
shape of a Z
2 - To make the flange will fit properly, you may have to cut
notches as per the example in figure 4,
Attaching the Duct Flange
1 - Align the front edge of the Z-shaped duct flange with
the cabinet flange. See figure 4,
2 - Fasten the Z-shaped flange to the cabinet flange with
field provided #8 X 1/2" sheet metal screws.
3 - See table one for the correct size of the duct flange,

*Duct Flange Dimensions

A = 14.5

13 3/8" (340 mm)

B = 17,5

16 3/8" (416 mm)

C = 21.0

19 7/8" (505 mm)

D = 24,5

23 3/8" (594 mm)

and Duct Flange

cabinet door
flange _
1/2
(13)

duct flange
side view

"Z" Duct

Table 1
Duct Flange Dimensions
Coil
Height

Cabinet

flange

duct flange top view

Refer back to the coil installation instructions to finish
installing the coil.

Page 2

Flange Dimensions: See table 1.
FIGURE 4

in (mm)
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