GeneralAire 900 SERIES - User Manual

1
PRECAUTION: The installer should be an experienced service technician. Disconnect electrical power before
beginning installation. Do not install where temperatures fall below 32 degrees F or where plenum temperatures
exceed 150 degrees F. When wiring into a multi-speed blower circuit see Step 9D.
FOR INSTALLATION ON A VERTICAL
PLENUM SURFACE OF ANY
FORCED AIR FURNACE
INSTALLER: PLEASE FILL OUT AND MAIL WARRANTY CARD AFTER INSTALLATION IS
COMPLETE. LEAVE INSTALLATION INSTRUCTIONS WITH HOME OWNER
INSTALLATION: The humidifier may be mounted with the 6" outlet to
the right or left by inverting the cabinet and reversing the positions of
the distributor trough and drain pan. The humidifier may be mounted
on the warm or return air plenum with equal efficiency.
See Typical Installations.
ADDITIONAL MATERIALS THAT MAY BE NECESSARY:
1. 1/4" diameter plastic supply tubing or 1/4" copper
supply tubing for hot water applications
2. 6" diameter galvanized by-pass pipe
3. electrical wire and wire nuts
4. current sensing relay (G.F. Model #GA50 suggested)
5. #8 self piercing sheet metal screws
900 SERIES
FLOW-THROUGH
BYPASS HUMIDIFIER
COPPER
TUBING
PLASTIC
TUBING
Mount the self tapping saddle valve or code valve on either a cold
or a hot water pipe. A side or top mount is best to avoid clogging
from pipe sediment. Connect 1/4” O.D. tubing to the saddle valve.
Copper tubing requires a brass compression nut and brass sleeve.
Plastic tubing requires a brass insert inside the tubing, a plastic
sleeve on the outside with a brass compression nut.
NOTE: DO NOT USE PLASTIC TUBING ON HOT WATER OR IN
CONTACT WITH ANY HOT PLENUM SURFACE OR DUCT.
INSTALLATION OF THIS SADDLE VALVE MUST MEET OR
EXCEED LOCAL CODES AND ORDINANCES.
4
2
1
2
UP FLOW
RETURN AIR
WARM AIR
GENERALAire AC SERIES
HIGH EFFICIENCY AIR CLEANER
R
DRAIN
DOWN FLOW
RETURN AIR
WARM AIR
WARM AIR
DRAIN
Connect by-pass pipe to collar and humidifier cabinet. Using
holes at top and bottom of side panel discharge, pierce 2 self
tapping screws through by-pass pipe.
Fresh Indoor Air Quality
R
FORM NO. 900-18 REV. F
3
12”
8-7/8”
6”
The GeneralAire model 900 may be installed on either the supply or
return plenum of a forced air handling system. Select a location for the
humidifier that allows for service and maintenance. Cut out a rectangle
8-7/8” wide by 12“ tall. Extend horizontal centerline of cut out to the
adjacent plenum. Cut a 6” hole 10” to 15” from side of humidifier, on
cabinet centerline, using connecting collar as guide. The bypass is
reversible and can be mounted on the right or left side of the
humidifier.
Humidifier is self retaining. Slide top side in first, then slide chassis
down. Level chassis and install center screws. If by-pass pipe installs to
opposite side of chassis, bend clip on chassis, remove side discharge,
and reinstall discharge to opposite side of chassis. Install remaining four
corner screws.
READ AND SAVE THESE INSTRUCTIONS

Summary

Installation and Precautions

Safety Precautions

Important safety warnings and precautions for installers before beginning the humidifier installation process.

General Installation Guidance

Specific Installation and Wiring

Code Valve Installation

Electronic Humidistat Wiring

Wiring diagrams and configurations for connecting electronic humidistats to the humidifier system (7A-7D).

Manual Humidistat Wiring

Wiring diagrams and configurations for connecting manual humidistats to the humidifier system (7E-7H).

Product Information and Maintenance

Seasonal Cleaning Procedures

Operation and Troubleshooting

Humidifier Will Not Operate

Diagnostic steps to identify and resolve issues when the humidifier fails to start or function correctly.

No Water Flow Troubleshooting

Steps to diagnose and fix problems where the humidifier has power but no water is flowing through the system.

Humidifier Never Shuts Off

Troubleshooting guide for situations where the humidifier runs continuously without stopping.

Excessive Humidity and Condensation

GeneralAire 900 SERIES Specifications

General

Model	900 SERIES
Type	Bypass Humidifier
Installation	Professional installation recommended
Control Type	Automatic
Mounting	Duct-mounted