GeneralAire 900 SERIES Elite - Manuel (Page 4)

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. ELECTRICAL RATING: 24 VAC / 60
Hz.
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 in "HI" or "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 on "LOW" or "SUMMER".
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
1. Turn off water supply and electrical power to humidifier.
2. Remove cover, distributor trough, evaporator pad 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.
3. Replace humidifier evaporator pad if necessary. (Part number GA19) Install trough and drain pan.
Replace cover. 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. GA4004) 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 orifice fitting and screw the
brass strainer body into the solenoid valve.
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. Close air damper.
TROUBLESHOOTING
SYMPTOMS DIAGNOSTIC STEP
Humidifier will not operate
Humidifier runs without
furnace operation or humidifier
never shuts off
Proper voltage present at solenoid
valve (24 VAC) but no water flow
Too much humidity in home and/or
condensation on windows
1. Set thermostat to operate both furnace burner and blower. Operation may be necessary for system power.
2. Humidity level in home may be higher than humidistat setting. Increase humidity setting on humidistat.*
3 . Verify water supply is on.
4. Check for voltage at the solenoid valve. Voltage should be 24VAC. Bypass the humidistat if necessary to isolate
the solenoid valve circuit.
5. Verify wiring of humidifier and humidistat.
1. Verify water supply is on
2. Verify metering orifice is not obstructed. Very hard water with high mineral content may restrict the metering
orifice in as little as one heating season. Replace metering orifice if restricted. (part number GA4231)
1. Verify humidifier and humidistat wiring. Humidifier should operate with furnace burner or blower cycle.
1. Reduce the setting on the humidistat. Refer to CARE AND MAINTENANCE section of this manual to estimate a
humidity setting for the home based on outside temperature. *
* Humidistat is generally located on furnace return plenum or on an inside wall in the living space.
Where can I purchase
replacement parts?
1. Replacement parts can purchased through your authorized GeneralAire contractor or visit www.GeneralAire.com
for more information.
USA CUSTOMERS
General Filters, Inc.
43800 Grand River Ave.
Novi, MI 48375
www.GeneralAire.com
[email protected]
Toll Free (866) 476-5101
CANADIAN CUSTOMERS
Canadian General Filters, Ltd.
400 Midwest Rd.
Toronto, ON M1P3A9 Canada
www.CGFProducts.com
[email protected]
Tel. (416) 757-3691
TECHNICAL SUPPORT