Honeywell F50F Manual page 5

Applications with a Humidifier
An evaporative humidifier can be mounted upstream
from the air cleaner. An atomizing humidifier should be
mounted downstream from the air cleaner, even though
hard water salts will be blown into the living space and
deposited as dust. If an atomizing humidifier must be
mounted upstream from the air cleaner:
1. Mount it as far as possible upstream from the air
cleaner.
2. Install a standard disposable furnace filter between
the humidifier and the air cleaner to trap water droplets
and hard water salts.
3. Frequently clean the air cleaner to prevent a hard
water salt buildup.
NOTE: The volume of water that passes through an atom-
izing humidifier can overload the air cleaner, resulting
in hard water salts being deposited as dust in the living
space.
Applications with an Activated Carbon Filter
An activated carbon (charcoal) filter can be used to
remove odors or other gaseous contaminants (not particle-
based) that are not removed by the air cleaner. Locate the
carbon filter:
• Downstream from the air cleaner. This means that
dust from the carbon filter will not be collected by the
air cleaner and will be deposited in the living space.
• Outside the air cleaner cabinet. Some carbon filters
are combustible and contact with high voltage could
result in smoke or fire.
• Where carbon granules cannot fall into the electronic
cell. If necessary, use a disposable furnace filter
between the carbon filter and the electronic cell.
• With proper transitions, if the activated carbon filter
requires a differently size duct than the air cleaner.
Allow 20 degrees expansion per side, per fitting.
NOTE: Honeywell does not offer carbon filters. Refer to
an activated carbon filter manufacturer for sizing and
application.
Applications with Outdoor Air Intake
Return air temperature must be at least 40° F [4° C].
Lower temperatures can cause ionizer wire failure. If out-
door air is used, warm it upstream from the air cleaner by:
• Making sure the outdoor intake is far enough upstream
from the air cleaner so the return and outdoor air is
thoroughly mixed. Stratified air can dump a stream of
very cold air into one section of the air cleaner.
• Adding baffles upstream from the air cleaner to force
thorough air mixing.
• Installing a Honeywell Home Ventilation System
that transfers up to 80 percent of the heat from the
exhaust air to the incoming outside air. This keeps
the incoming air above 40° F [4° C] and reduces
energy usage.
• Installing a preheater if large amounts of outdoor air
are used. The preheater, which could be an electric
strip heater or hot water coil, should be controlled by
a thermostat. Hot water or steam coils should be
protected by a freeze-up control.
Optional W8600E
The F50F terminal board is recessed slightly so it or the
wires will not interfere with installation. The entire power
supply box can be unplugged and removed to provide
access to the terminals. The W8600E Indicator can be
mounted in the living area or in the furnace room. It should
be located in a convenient location to observe the LEDs.
CHOOSE F50F LOCATION
Choose a location that is readily accessible for regular
inspection and cleaning. Allow at least 13 in. [330 mm] in
front of the access door for removing the prefilter and
electronic cell. Allow enough room above the power sup-
ply so it can be serviced without removing pipes, ducts, or
other heating system components.
The air cleaner must be installed where the temperature
will not exceed 40° F to 125° F [4° C to 52° C].
CHOOSE MOUNTING POSITION
!
WARNING
HEAVY EQUIPMENT.
CAN CAUSE INJURY OR
EQUIPMENT DAMAGE.
Do not mount the air cleaner with the access door
facing down. If the access door faces down, the
latch may not hold, and the cell and prefilter can
fall unexpectedly. Also, nothing holds the cell and
prefilter in place when the access door is opened.
The air cleaner can be mounted in any position except
with the access door facing down. Following is a list of
air cleaner mounting positions for a variety of furnace
installations.
NOTE: At least 13 in. [330 mm] clearance is required be-
tween the access door and any obstructions for cell and
prefilter maintenance.
— Upflow "Highboy" furnace: Side installation; air
cleaner is mounted vertically where return enters side
inlet of furnace. See Fig. 3A.
— Upflow "Highboy" furnace: Installation beneath fur-
nace (air cleaner cabinet can easily support weight
of furnace and air conditioner coil). Air cleaner is
mounted horizontally where return enters from be-
low. See Fig. 3B.
— Upflow "Highboy" furnace: Closet installation. Air
cleaner is mounted vertically on furnace between
furnace and louvered return air opening in closet
door. See Fig. 3C.
— "Lowboy" furnace: Air cleaner is mounted horizon-
tally in return plenum just above furnace, opposite of
supply plenum. See Fig. 3D.
5
PLANNING THE INSTALLATION
68-0137B—2
F50F