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9. CLEARANCES
Minimum clearances, as specified in Table 2, must be
maintained from adjacent structures to provide
adequate fire protection, adequate combustion air,
and room for service personnel.
While minimum clearances are acceptable for safety
reasons, they may not allow adequate air circulation
around the unit for proper operation in the cooling
mode. Whenever possible, it is desirable to allow
additional clearance, especially around the condenser
inlet and discharge openings. DO NOT install the
unit in a location that will permit discharged air from
the condenser to recirculate to the condenser inlet.
TABLE 2
MINIMUM INSTALLATION CLEARANCES
O
t u
t e l
D
u
t c
f (
o r
m
c
o
m
b
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t s
b i
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V
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m
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t s
b i
C
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o
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t t
o T
p
B
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e
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e
C
o
m
b
u
t s
b i
e l
B
a
s
e
(
W
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o
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o
c f
o
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n i
g
m
t a
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a i
) l
WARNING
Clearances from combustible materials must
be maintained as specified. Failure to maintain
clearances could cause fire resulting in
property damage, injury, or death.
10. VENT TERMINAL AND COMBUSTION
AIR INLET HOOD
The vent terminal is shipped in the burner
compartment. Remove the two shipping screws and
separate the two-piece assembly. Install the vent
terminal by using the four screws provided. Make
sure gasket is in place. See Figure 2. The
combustion air intake hood is factory installed.
11. OPTIONAL VERTICAL VENTING
With the optional vertical venting kit this unit may be
vented vertically through a roof or overhang. The kit
includes a stainless steel transition drain tee, silicone
sealant, and drain tubing.
m
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1
6
i
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2
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, A
B
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s
CAUTION
Vent terminal must be installed as shown in
Figure 2 for proper operation of the heating
system.
12. VENT RESIZING INSTRUCTIONS
When an existing furnace is removed from a venting
system servicing other appliances, the venting system
is likely to be too large to properly vent the
remaining attached appliances.
The following steps shall be followed with each of
the appliances remaining connected to the common
venting system, placed in operation one at a time
t e
while the other appliances remaining connected to
the common venting system are not in operation.
1. Seal any unused openings in the venting system;
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas code, ANSI Z223.1 or the CAN/CGA B149
Installation Codes and these instructions.
Determine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which
could cause an unsafe condition;
3. In so far as is practical, close all building doors
and windows and all doors between the space in
which the appliance(s) connected to the venting
system are located and other spaces of the
building. Turn on clothes dryers and any
appliances not connected to the venting system.
Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers;
4. Follow the lighting instructions. Place the
appliance being inspected in operation. Adjust
thermostat so appliance shall operate continuously;
5. Test for draft hood equipped appliance spillage at
the draft hood relief opening after 5 minutes of
main burner operation. Use the flame of a match
or candle;
6. After it has been determined that each appliance
connected to the venting system properly vents
when tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any
other gas-burning appliances to their previous
conditions of use;
7. If improper venting is observed during any of the
above tests, the venting system must be corrected.
Manual 2100-365
Page 13
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