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5.
Position furnace or coil cabinet and furnace on subbase so it
aligns between the locating tabs.
Figure 37
Furnace Subbase
T
H
K
2"
P
L
N
A
Hole
in
Floor
A = 4 1/4" Minimum clearance from back of hole to wall or other obstruction.
Figure 38
Coil Cabinet Subbase
T
H
K
R
2"
P
L
N
Hole
A
in
Floor
A = 4 1/4" Minimum clearance from back of hole to wall or other obstruction.
8. Checks and Adjustments
Startup
NOTE: Refer to the start--up procedures in the "User's Information
Manual" or to the "Operating Instructions Label" on the furnace.
CAUTION
!
If any sparks, odors or unusual noises occur,
immediately shut OFF power to furnace. Check for
wiring errors or obstruction to blower.
Failure to correct hazard could result in death,
personal injury, and/or property damage.
Gas Supply Pressure
Gas supply pressure should be within minimum and maximum val-
ues listed on rating plate. Pressures are usually set by gas suppli-
ers.
440 01 1020 02
S
Plenum
J
2"
R
1"
Combustible
Floor Base
M
25--20--46
S
Plenum
J
2"
1"
M
25--20--46b
Figure 39
Setting the Subbase
Furnace
Installation of
Combustible
Floor Base
Wood Screw
This subbase for combustible floors has been designed so that the
height of the subbase raises the downflow coil off the floor to allow
easy installation of the condensate drain. See Figure 40.
Figure 40
Condensate Line Raised by Base
Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners operat-
ing.
!
Fire or explosion hazard.
Failure to turn OFF gas at shut off before connecting
manometer can result in death and/or personal
injury.
Turn OFF gas at shut off before connecting
manometer.
1.
Remove the burner compartment door.
2.
With gas OFF, connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15² water column
range.
Wood Floor
Plenum
25--20--46a
25--20--52
33
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