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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 humidifier uses only 2.5 watts of electrical power during operation; 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 humidistat connected in
series with the solenoid provides low voltage control of the humidifier. The humidistat is designed for wall
mounting in the living area or surface mounting on the return air duct.
!
• 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.
• 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. Approximately 200 CFM of air is by-passed
from the warm air plenum through the humidifier and returned to the
cold air plenum. 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. Leave knob on the humidifier pointing towards
the "WINTER" position. To turn the humidifier off, close water supply valve, switch electrical power off and
turn humidistat off. If furnace is used for summer cooling or ventilating set air damper to the "SUMMER"
position.
Maintenance
Your humidifier is engineered to give helpful and trouble-free humidification. For maximum efficiency the following
cleaning procedures should be carried out at the end of each heating season:
1. Turn off the water supply and electrical power to the humidifier.
2. Remove cover, water distributor trough, Vapor Pad
deposits from the distributor trough, drain pan, pad rails and humidifier cabinet. A solution of 1/2 vinegar & 1/2
water will help loosen mineral deposits. Inspect drain hose, clean or replace as necessary.
3. Replace humidifier evaporator pad if necessary. (P/N GA19) Install trough, pad rails and drain pan.
Replace cover, reconnect electrical plug. Replace evaporator pad yearly for peak performance.
4. In heavy mineral areas or if the solenoid valve fails to function disconnect the 1/4" water supply line from
the solenoid valve. Carefully pull the strainer screen (P/N 900-8) from the valve body (P/N 900-6). Clean the
mineral deposits from all parts. If the orifice is clogged, it may be opened by inserting a small pin. Reinsert the
filter into the valve body.
5. Reconnect the 1/4" water line to the solenoid valve if necessary. Turn on the water supply and check all points
for leakage. The operation of the unit may be checked by starting the furnace. The humidifier operates only
when the furnace blower is running or the burner circuit is energized. The humidifier is now ready for operation.
6. During the summer, turn OFF the water supply and electrical power to the humidifier. Close air damper.
, pad rails and drain pan. Clean excessive mineral
®
Model 900 Humidifier Installation Manual
At Outside
Recommended
Temperature
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%
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