AutoFlo SC-15 Owner's Manual

FOR USE WITH GAS, OIL and HYDRONIC FORCED AIR FURNACES
SEQUENCE OF OPERATION
The AUTOFLO Model's SC15 & 250 use the
evaporative principal to add moisture to the warm
air heating system. Upon a demand for Humidity
from the Humidity Control, the water solenoid valve
opens and water flows in at the top of the media pad
and is evaporated, as warm air passes through the
media pad. When the moisture laden air re-enters
the duct it is mixed with the dry air already flowing
through the duct. This moisture laden air gradually
increases the relative humidity level in the home.
RECOMMENDED LOCATION
TEMPERATURE AND SAFETY REQUIREMENTS
Refer to the rating plate on the furnace for minimum
clearances to combustible construction. All parts
and connections of an AUTOFLO humidifier must
be installed outside of the minimum clearance
requirements for rear, top, sides, and flue of
furnace. Do not install where humidifier or water
connections may be exposed to freezing
temperatures or outside weather. Attic installations
are not recommended. If you have central air
conditioning, carefully plan the location of the
plenum opening to prevent damage to the cooling
coil or other components inside the duct.
HUMIDIFIER MOUNTING LOCATION
The AutoFlo model SC-15, is to be mounted on the
supply duct of the furnace only. Model 250 can be
mounted on the supply or the return duct of the
furnace.
HUMIDISTAT MOUNTING LOCATION
The humidistat can be mounted on the cold air
return duct to sense the cool dry air returning to the
furnace. It can also be mounted on an interior wall
near the furnace thermostat as well. The electrical
connections and basic wiring are the same for duct
mounted or wall mounted humidistats.
TB 218 Part # 090375A0218 Rev. B
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
Copyright 2003 EWC Controls Inc., All Rights Reserved
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Installation Instructions

Owner's Manual
MODEL SC-15 & MODEL 250
FLOW-THRU HUMIDIFIERS
STEP BY STEP INSTALLATION
CAUTION: Installation should be performed by
qualified personnel only. Use eye protection and
gloves when drilling and
All work must be performed to local & national
codes and ordinances. Use multi-conductor 18
awg solid copper wire. Provide over-current
protection as required. DO NOT omit the drain or
overflow tubing.
DRILL MOUNTING HOLES AND CUT
OPENING MODEL SC-15
Turn off power to the furnace before installing the
humidifier. Test Fit the SC15 housing on the side
of the warm air plenum. Before proceeding, verify
that adequate clearances are available for
servicing the media pad. There must also be
adequate room ( 5 ½ inches) inside the plenum
for the louver. If necessary, relocate the unit. Use
a plumb line or a level to make sure the housing is
level. With a permanent marker outline the inside
edge of the housing. Also mark the twelve holes
to be drilled. Center punch and drill all twelve
holes as indicated by the marks. Drill or punch a
starter hole and then use tin snips to cut out the
rectangular shaped opening. The opening should
be 1/8 inch larger on all four sides than what was
marked.
MOUNTING HUMIDIFIER
Hold the housing next to duct and start four #8 x ¾
inch long sheet metal screws through the holes in
the bottom edge of the humidifier. With these four
screws started the unit should remain in place
while starting the other eight screws. With all
twelve of the screws started they can now be
tightened. With the housing mounted the louver
can be installed. This should be done by rotating
the louver to the proper position depending on the
direction of air flow. The airflow should enter into
the curved multi-louvers and exit out of the large
opening.
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handling sheet metal.