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Model 1099LHS Humidifier Installation Manual
• 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, less than the
smallest household light bulb. 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.
• Water flows through a strainer, is metered through an orifice to provide the proper amount of water, and is
supplied to the Vapor 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 Vapor Pad
®
.
• Minerals are not blown into the air stream as occurs in atomizing
humidifiers; they are left on the Vapor 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. Set knob on the humidifier to
"HI" or "WINTER" position. To turn the humidifier off, close the water
supply valve, switch electrical power off and turn the humidistat off.
If furnace is used for summer cooling or ventilating set air damper on
"LOW" or "SUMMER".
•
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%
!
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 water supply and electrical power to humidifier.
2. Remove cover, water distributor trough, Vapor Pad
®
, pad rails and drain pan. Clean excessive mineral
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. Insert a new GA19 (GFI #7919) Vapor Pad
®
(black notch on top). Install trough, pad rails and drain pan.
Replace cover, reconnect electrical plug. Replace Vapor 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 from the valve body. 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 water supply and electrical power to humidifier.
