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Installation Instructions
12.
control board with humidifier control terminals (sometimes marked HUM). You may also consult the fur-
nace installation manual or wiring diagram. If humidifier terminals are present, proceed to No. 12A.
If humidifier terminals are not present, answer the following questions:
•
Is the blower motor powered with a supply greater than 120 volts? OR
•
Does the blower motor change speed during the heating mode? OR
•
Does the blower motor change speed when the thermostat's system fan switch is activated during the
heating mode? OR
•
Does the blower motor change speed when the air conditioning is activated?
If the answer to any of the above questions is YES, skip to No. 12B.
If the answer to all of the above questions is NO, skip to No. 12C.
12C.
If you have determined that the system blower motor is a
120 volt, single-speed motor, and that it does not change speed
during the cooling mode, wire the transformer into the blower
motor wiring. This will coordinate the humidifier and system op-
erations. (See Diagram C, right.)
13.
Tap into the water
supply line using the
saddle valve provided.
Follow the directions on
the saddle valve bag.
IO-308
Model HUM-SFTBP
Bypass Flow-Thru Humidifier
Mounting Template
Template Must Be Level
Detach Mounting Template Here
(continued)
Shut off the furnace power. If the furnace is relatively new, check to see if there is an electronic
12A.
Using a meter, check the
terminals for power output
during the heating cycle
when the blower is running.
Determine the output volt-
age. Some circuit boards
have printed indicators. Most
are 24 volt AC and only require
connecting the humidifier solenoid
and the humidistat. (See Wiring
Diagram A, right.)
If, in rare cases, the furnace ter-
minals are 120 volt, connect the
transformer to the terminals and
wire as shown in Diagram C.
Wiring Diagram B
Multi-Speed Blower
14
14.
Connect copper tub-
ing from the saddle valve
to the solenoid valve. (Do
not use plastic tubing.)
Check for leaks.
The saddle valve must be
fully opened or closed. Do
not use the valve to regu-
late water flow.
Goodman® is a registered trademark of Goodman Manufacturing Company, L. P.
Amana® is a trademark of Maytag Corporation and is used under license to Goodman Company, L. P.
All rights reserved.
9"
12B.
For multi-speed blowers or systems not using 120
VAC, use an HUM-A50 Electronic Relay or other method of
coordinating humidifier operation
with the system air mover. The
source of power for the humidifier
transformer should not be the
blower motor wiring, but an inde-
pendent source. This is to prevent
transformer failure, either from
feedback from the blower motor during air conditioning, or
from voltage greater than the 120 volts required for the
transformer. (See Wiring Diagram B, left.)
15.
Attach a 1/2" I.D. vinyl
hose and clamp to carry the
flushing water from the unit to
the drain. Be sure the drain
15
hose has a constant pitch to
the floor drain. To avoid
damage to the drain fitting,
do not use solvent type
adhesives when connecting
the plastic hose to the
humidifier.
Wiring Diagram A
Terminals on Board
Wiring Diagram C
Single-Speed Blower
16.
Test operation. Check
for water leaks. Be sure
the humidistat is operating
properly.
05/06
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