Preferred
TM
Model PF845411/PF845412
I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
5
Preferred Products
Upflow - Bottom Return
Down-flow
4.1 Recommended Minimum Installation Clearance
Left
3 inches
Right
3 inches
Top
2 inches
Bottom
6 inches
Back
12 inches
!
CAUTION
This humidifier should be installed by a qualified service per-
son only. Do not connect the unit to the power source until
the installation is complete. A thorough checkout of the unit
installation should be completed before operating the unit.
Failure to follow these directions may void the manufacturer’s
original warranty.
4.2 Mounting
The Preferred
TM
PF845411/PF845412 humidifier should be
mounted directly to the warm air supply duct of your HVAC sys-
tem. Since warm air is required for maximum performace, do
not mount the humidifier to the return side of the HVAC duct.
Certain conditions must be met to ensure proper unit operation.
Refer to the following list.
•
Ensure that the duct surface is reinforced, if necessary, to
allow the unit to remain level and plumb.
•
Ensure that the humidifier has adequate clearance to allow
for the removal and replacement of the evaporator pad.
•
When installing the humidifier in an attic or above a ceiling,
a drain tray must be installed under the unit as a precau-
tionary measure to prevent water damage from occuring if
a leak develops.
•
The recommended humidistat range is 30-40% relative hu-
midity. If condensation occurs on windows, the humidistat
setting must be lowered to prevent condensation damage.
•
DO NOT install the humidifier where freezing temperatures
may occur.
•
DO NOT install the humidifier where it interferes with the
furnace access panels.
•
DO NOT install the humidifier close to a flue pipe. Intense
heat may damage the humidifier.
•
DO NOT mount the humidifier in the jacket of a cased
coil. It is preferable to mount the humidifier immediately
downstream of the cased coil, if present. Ensure that the
humidifier does not interfere with the coil ends.
•
DO NOT mount the humidifier in a furnace jacket.
•
DO NOT install on gravity hot air systems.
•
DO NOT connect a hot water supply to Preferred
TM
humidi-
fiers that are equipped with water saving controls. (Model
PF845412 with Water Saving Controls).
!
IMPORTANT
The unit must be installed so that interconnection can be
made to the source of electrical supply without the use of an
extension cord.
1. Tape the mounting template to the duct so that it is flat and
the top edge is level.
2. Carefully remove the center of the template by tearing
along the perforated lines. Use a marker to trace on the
duct along the cutout opening.
!
WARNING
Electrical power to the furnace must be disconnected before
proceeding. Serious injury or death may result.
3. Drill the holes marked on the template. Remove the
template from the duct and carefully cut the duct along
the outside edge of the rectangle that was traced by the
marker. Remove any burrs from the cut edge of the sheet
metal taking care not to injure yourself.