Owner's Manual

Model 1137 Humidier Installation Manual
7. Connect drain hose to 5/8" spout on humidier
cabinet using hose clamp provided. Run 5/8"
hose to suitable drain such as oor drain, sewer
or laundry sink. Be sure hose has continuous
slope and is not kinked at any point.
8 Turn on water supply and plug in power cord to check operation of humidier. Set humidistat to a
demand setting. With the furnace off, the solenoid valve should be closed and the humidier fan not
running. Start the furnace, the solenoid valve should open and the humidier fan run when the blower
or burner circuit is energized. Check flow of water through distributor trough and evaporator pad. The
standard GF-9903776 orifice will supply approximately 3.5 GPH of water at a line water pressure of 60
psi. For low water pressures (20-40 psi) a larger orifice GF-9903775 is available to provide the same
flow. Leave humidistat set at the recommended setting.
Installation Cont.
• The operating principle of the humidier is based on the most efcient and economical means of evaporating
water to the air. The heat necessary for evaporating water is produced by the furnace.
• The water supply to the humidier is controlled by the electric solenoid valve. The solenoid valve and
humidier fan are controlled by a humidistat connected through an
isolation relay. The humidistat is designed for wall mounting in the
living area or surface mounting on the return air duct.
• Water ows through a strainer, is metered through an orice to provide
the proper amount of water, and is supplied to the evaporator pad by
the distributor trough. Air from the warm air plenum is pulled through
the wetted evaporator pad by the humidier fan and returned to the
warm air plenum to be circulated through the living area. Moisture is
evaporated to the air passing through the evaporator pad.
• Minerals are not blown into the air stream as occurs in atomizing
humidiers; they are left on the evaporator pad where a high
percentage is carried off with the waste water.
• When the humidier is installed and operating, no adjustments are
necessary other than setting the control knob on the humidistat to the desired level of humidication.
• To turn the humidier off, close water supply valve, switch electrical power off and turn humidistat off.
• CAUTION: Do not set relative humidity too high during cold weather. Excessive humidity may cause
condensation on windows or in walls. Refer to recommended settings as described in the humidistat owners
manual.
How the Humidifier Works
At Outside
Temperature
Recommended
Setting
-20°F -29°C 15%
-10°F -23°C 20%
0°F -18°F 25%
+10°F -12°C 30%
+20°F -7°C 35%
+30°F -1°C 40%

!
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]