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
4
Preferred Products
3. Introduction
The benefits of a properly humidified environment (35-50%
Relative Humidity) are many. They include both personal com-
fort as well as the preservation of furniture, draperies, carpets,
wooden floors and cabinets, paintings, pianos, etc. Your home
can be more comfortable at a lower temperature (i.e.: 68° F)
at 30-40% Relative Humidity (RH) than at 71° to 72° F with-
out controlled humidity. Since every degree of temperature
setback represents about 3% of your heating costs, this can
possibly represent a significant annual savings. During the heat-
ing season, cold air infiltrates the home and must be heated.
When heated, this air dries out and greatly increases its
capacity to hold more moisture. By using a humidifier, a
source of water is provided to satisfy this increased mois-
ture holding capability, rather than having it drawn from our
body surface and the surrounding furnishings in the home.
3.1 Basic Operation
Your Preferred
TM
fan-powered evaporative humidifier oper-
ates on the principles of evaporation. Water is introduced to
an evaporator pad as warm air is drawn from the duct and cir-
cuilated through the pad. The warm air evaporates the water
and the relative humidity of the air increases. Any excess water
is passed to the drain. PF845412 units are equipped with a
water saving controller which acts to minimize the amount of
water that may flow to the drain by adjusting the total water flow
to the humidifier.
Setting the humidistat in the recommended range of 30-40%
relative humidity assures automatic humidity control during the
heating season. A lower setting may be necessary to prevent
condensation on windows. An electronic humidistat is supplied
with PF845412 units that can automatically adjust the setpoint
as the outdoor temperature falls.
No action is needed to turn the humidifier off for the summer
months. If desired, simply lower the humidistat setpoint.
3.2 “What’s In The Box?”
PF845411
PF845412
Description
X
X
Humidifier
X
Mech. Humidistat
X
Electronic Humidistat
X
Transformer
X
X
Parts Bag
3.3 Unit Specifications
Type of Unit
Fan-Powered Evaporative
Mounting Location
Warm Air Supply Duct
Capacity (GPD)
20.0 GPD @ 140 °F
16.5 GPD @ 120 °F
10.0 GPD @ 100 °F
Water Supply
20-100 PSI
Voltage(Amps)
120VAC(0.8A)
Unit Dimensions
11.6"W x 10.12"D x 18.12"H
Water Supply Connection
1/4” OD Tubing
Drain Water Connection
1/2” ID Tubing
Duct Opening
13.13”W x 14.25”H
Shipping Weight
17 Lbs.
Operating Weight
13 Lbs.
Approvals
ETL
4. Installation
Prior to installing this product:
•
Read the instructions carefully and completely to ensure
safe operation. Failure to follow the instructions could lead
to damage to the product or cause a hazardous condition.
•
Check the ratings given on the product to make sure it is
suitable for your application.
Remember to select a location that is readily accessible for
periodic inspection, cleaning, and service. The following table
indicated the minimum allowable installation clearances. The
following illustrations show some of the possible installation
configurations and where the humidfier should be installed.
This model must be installed on the discharge air side of the
furnace or heat-pump so that it will operate with the warmest
possible air.
Upflow - Side Return
Horizontal Flow