Lennox KGC Series Unit Information page 41

E-Flue Passageway and Flue Box (Gas Units)
1 - Remove combustion air inducer assembly as de-
scribed in section D.
2 - Remove flue box cover. Clean with a wire brush as
required.
3 - Clean tubes with a wire brush.
4 - Reassemble the unit. The flue box cover gasket
and combustion air inducer gasket should also be
replaced during reassembly.
F-Evaporator Coil
Inspect and clean coil at beginning of each cooling season.
Clean using mild detergent or commercial coil cleaner.
Flush coil and condensate drain with water taking care not
to get insulation, filters and return air ducts wet.
G-Condenser Coil
Clean condenser coil annually with water and inspect
monthly during the cooling season.
Clean the coil by spraying the coil steadily and uniformly
from top to bottom. Do not exceed 900 psi or a 45° angle;
nozzle must be at least 12 inches from the coil face.
Take care not to fracture the braze between the fins and
refrigerant tubes. Reduce pressure and work cautiously to
prevent damage.
H-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
I-Electrical
1 - Check all wiring for loose connections.
2 - Check for correct voltage at unit (unit operating).
3 - Check amp-draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
VII-OPTIONAL ACCESSORIES
The accessories section describes the application of most
of the optional accessories which can be installed to the
KGC units.
A-LP / Propane Kit
KGC092/150 units require a natural to LP /propane kit.
The kit includes one LP spring conversion kit, up to eleven
burner orifices and three stickers. For more detail refer to
the natural to LP gas changeover kit installation instruc-
tions.
B-Drain Pan Overflow Switch S149 (optional)
The overflow switch is used to interrupt cooling operation
when excessive condensate collects in the drain pan.
The N.O. overflow switch is controlled by K220 and DL46
relays, located in the unit control panel. When the overflow
switch closes, 24VAC power is interrupted and after a
fivesecond delay unit compressors are de-energized.
Once the condensate level drops below the set level, the
switch will open. After a five-minute delay the compressor
will be energized.
C-C1CURB Mounting Frames
When installing units on a combustible surface for downflow
discharge applications, the C1CURB roof mounting frame
is used. The roof mounting frames are recommended in
all other applications but not required. If the KGA/KGB
units are not installed on a flat (roof) surface, they MUST
be supported under all edges and under the middle of
the unit to prevent sagging. The units MUST be installed
level within 1/16" per linear foot or 5mm per meter in any
direction.
The assembled C1CURB mounting frame is shown in
FIGURE 28. Refer to the roof mounting frame installation
instructions for details of proper assembly and installation.
The roof mounting frame MUST be squared to the roof
and level before installation. Plenum system MUST be
installed before the unit is set on the mounting frame.
Typical roof curbing and flashing is shown in FIGURE 29.
Refer to the roof mounting frame installation instructions
for proper plenum construction and attachment.
ASSEMBLED ROOF MOUNTING FRAME
SUPPLY AIR
RETURN AIR
OPENING
TYPICAL FLASHING DETAIL
UNIT BASE
BOTTOM
FIBERGLASS
INSULATION
(Furnished)
NAILER STRIP
(Furnished)
RIGID INSULATION
(Field Supplied)
ROOF
MOUNTING FRAME
(Extends around entire
perimeter of unit)
Page 41
OPENING
FIGURE 28
UNIT BASE RAIL
COUNTER FLASHING
(Field Supplied)
CANT STRIP
(Field Supplied)
ROOFING
MATERIAL
FIGURE 29