Page 63
D-Combustion Air Inducer
A combustion air proving switch checks combustion air in
ducer operation before allowing power to the gas controller.
Gas controller will not operate if inducer is obstructed.
Under normal operating conditions, the combustion air in
ducer wheel should be checked and cleaned prior to the
heating season. However, it should be examined periodi
cally during the heating season to establish an ideal clean
ing schedule.
Clean combustion air inducer as follows:
1- Shut off power supply and gas to unit.
2- Remove the mullion on the right side of the heat sec
tion.
3- Disconnect pressure switch air tubing from combustion
air inducer port.
4- Remove and retain screws securing combustion air
inducer to flue box. Remove vent connector. See fig
ure 16.
5- Clean inducer wheel blades with a small brush and
wipe off any dust from housing. Take care not to dam
age exposed fan blades. Clean accumulated dust from
front of flue box cover.
6- Return combustion air inducer motor and vent connec
tor to original location and secure with retained screws.
It is recommended that gaskets be replaced during re
assembly.
7- Replace mullion.
8- Clean combustion air inlet louvers on heat access pan
el using a small brush.
E-Flue Passageway and Flue Box
Remove flue box cover only when necessary for equipment
repair. Clean inside of flue box cover and heat exchanger
tubes with a wire brush when flue box cover has to be re
moved. Install a new flue box cover gasket and replace cov
er. Make sure edges around flue box cover are tightly
sealed.
F-Supply Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove ac
cess panel or to clean blower wheel.
G-Evaporator Coil
Inspect and clean coil at beginning of each cooling season.
Clean using mild detergent or commercial coil cleanser.
Flush coil and condensate drain with water taking care not to
get insulation, filters and return air ducts wet.
H-Condenser Coil
All-Aluminum Environ Coils
Clean condenser coil annually with water and inspect
monthly during the cooling season.
Clean the all-aluminum 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 cautious
ly to prevent damage.
VII-ACCESSORIES
The accessories section describes the application of most of
the optional accessories which can be factory or field installed
to the KGB units.
A-T1CURB / K1CURB
When installing the KGB units on a combustible surface
for downflow discharge applications, the T1CURB /
K1CURB 8 inch, 14‐inch, 18 inch or 24‐inch height roof
mounting frame is used. The roof mounting frames are
recommended in all other applications but not required. If
the KGB units are not mounted 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 mount
ed level within 1/16” per linear foot or 5mm per meter in any
direction.
The assembled mounting frame is shown in figure 24. Re
fer to the roof mounting frame installation instructions for
details of proper assembly and mounting. The roof mount
ing frame MUST be squared to the roof and level before
mounting. Plenum system MUST be installed before the
unit is set on the mounting frame. Typical roof curbing and
flashing is shown in figure 25. Refer to the roof mounting
frame installation instructions for proper plenum construc
tion and attachment.
B-Transitions
Optional supply/return transitions T1TRAN10AN1 is
available for use with the KGB 2, 2.5, 3, 4 and 5 units and
the T1TRAN20N-1 is available for the 6 and 7-1/2 ton
units utilizing optional K1CURB roof mounting frames.
Transition must be installed in the K1CURB mounting
frame before mounting the unit to the frame. Refer to the
manufacturer's instructions included with the transition for
detailed installation procedures.
To Next Page
Loading...
Need help?
General
