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Final Steps Of Installation
7. Replace evaporator pad assembly and humidifier cover.
CAUTION: To prevent possible injury, ensure cover is fully
!
seated before continuing to next step.
Insert low voltage six connector wiring harness from cover
into chassis solenoid harness.
8. Turn on the water supply and plug in the power cord to
check operation of humidifier. Set the humidistat to a
demand setting. With the furnace off, the solenoid valve
should be closed and the humidifier fan not running.
Start the furnace, the solenoid valve should open and
the humidifier fan run when the blower or burner circuit is
energized. Check flow of water through distributor trough
and evaporator pad. The standard GA4231 yellow 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 GA4299 is available to provide the same flow.
Leave humidistat set at the recommended setting.
How The Humidifier Works
• The operating principle of the humidifier is based on the most efficient 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 humidifier is controlled by the electric solenoid valve. The solenoid valve and
humidifier 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 flows through a strainer, is metered through an orifice 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 humidifier 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
humidifiers; they are left on the evaporator pad where a high
percentage is carried off with the waste water.
• When the humidifier is installed and operating, no adjustments are
necessary other than setting the control knob on the humidistat to the
desired level of humidification.
• To turn the humidifier off, close the water supply valve, switch the electrical power off, and turn the
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.
7 7
At Outside
Temperature
-20°F
-10°F
0°F
+10°F
+20°F
+30°F
Model 1000 Humidifier Installation Manual
Recommended
Setting
-29°C
15%
-23°C
20%
-18°F
25%
-12°C
30%
-7°C
35%
-1°C
40%
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