Installation & Operating Instructions
FLOW THROUGH FURNACE HUMIDIFIER
Check the package contents.
1. Humidifier Assembly: A. Cover, B. Water Distribution Frame, C. Water Pad, D. Bypass Collar, E. Bypass Cap,F. Scoop, G. Solenoid, H. Humidifier Base
2. Hardware Kit: I. Wire Nuts (4), J. Hose Clamp, K. Large Screws (6), L. Small Screws (10)
3. Humidifier Accessories: O. Humidistat Kit, Q. Damper Assembly, R. Duct Collar, S. Wire, U. Water Drain Hose, V. Duct Collar Template, W. Humidifier Base Template, X. Humidistat Template
TOOLS NEEDED: Work Gloves, Safety Glasses, Tin Snips, Electric Drill, Drill Bits (3/8”, 1/4”, 1/8”, 5/64”),
Slotted Screw Driver Or 1/4” Hex Driver, Phillips Screw Driver, Scissors, Adjustable Wrench, Pliers, Punch, Level, Tape, Pencil, Voltage Meter (Optional), Measuring Tape
Identify Your Furnace Style Best locations to install humidifier
Arrows indicate the direction of air through the furnace. Cold air, returning to the furnace is called the “Return”. The
side that is supplying the house with Hot air is called the “Supply”.
(1) shows the best placement of the humidifier on the ductwork.
A. Highboy Furnace- mounted on supply
B. Lowboy Furnace- mounted on supply
C. Horizontal Furnace- mounted on supply
Alternate locations to install humidifier
In the event that the humidifier will not fit in the locations of (1), (2) shows alternate placements of the humidifier on the duct work.
D. High Boy Furnace- mounted on return
E. Lowboy Furnace- mounted on return
F. Horizontal Furnace- mounted on return
G. Down Flo Furnace- mounted on return
Incorrect Installations (1)
A. Do not drain humidifier into a bucket. You must have the drain hose secured to a floor drain.
B. Do not install Bypass Collar too low. Bypass Collar should always be installed parallel with humidifier unit for best results.
C. Do not install humidifier on furnace housing. Only install on duct work.
D. Do not install the Bypass Collar to the same duct work as the humidifier unit is installed to.
Locate the “A” Coil (2)
Does your furnace have central air conditioning? Furnaces equipped with central air conditioning have an “A” coil that is located inside the supply side duct work next to the furnace. Inspect carefully for placement and direction of “A” coil
E. The Humidifier unit or duct collar mounted above the “A” coil.
Mount and cut humidifier template
Mount template in correct position on duct work making sure it is level (G). Mark opening, cutting lines and holes with marking open. Always use safety glasses and heavy gloves when working with ductwork. To make drilling easier, use a punch and hammer to dent duct where holes are to be drilled. Drill holes using appropriate drill bit sizes stated on template. From center hole where humidifier base fits, cut with tin snips towards each corner hole following the cutting lines (H). Be careful cutting, the duct work is very sharp! Then cut perimeter of the mounting hole. Keep the cuts as straight as possible.
Installing humidifier base on duct
On the bottom of the Humidifier base there are 2 hooks. Clip them over the bottom edge of the hole in the duct. Mount top 2 screws. Check Humidifier unit for being level and adjust if necessary. When level, insert the other 4 screws. Do not over tighten the screws. Humidifier must be level for correct operation and to prevent leaks.
Left or Right bypass installation
Determine which side the bypass flex duct will come off of the Humidifier. The bypass collar can be mounted on the left (A) or right (B) side. Remove the one screw per side and reposition the end caps for proper bypass installation. Screw the end caps back into place.
Mounting the scoop
The scoop can be rotated to fit 4 different positions. The position is determined first by the side of the duct it is on (Supply or Return) and secondly by the direction of airflow.
C. Mounted on supply duct. The scoop should face the air flow and scoop the air into the humidifier.
D. Mounted on return duct. The scoop should face away from the air flow. The scoop will click into place with 4 tabs when inserted into humidifier. Be sure all 4 tabs lock. The scoop will penetrate into the duct work about 3 inches.
Mounting bypass duct collar
Position the template in the correct place on the duct. Mark the screws and hole placement with a marking pen. Use safety glasses and heavy gloves when working with sheet metal. To make drilling easier, use a punch and hammer to dent duct where holes are to be drilled. Drill the 6 screw holes using the appropriate size drill bit identified on template. Drill large hole in center of the area to be cut out. Use tin snips to cut sheet metal in a pinwheel shape until the outer marked hole is cut.
E. Open damper (allows air to flow through Humidifier)
F. Closed damper (prevents air flow through humidifier)
Attach bypass flex duct
G. Mount flex duct over duct collar. Use 2 screws to hold in place by screwing them into plastic collar. Pull the duct tight and line up with Humidifier bypass collar. Cut flex duct to correct size.
H. Mount free end of flex duct to Humidifier bypass collar. Use 2 screws to hold flex duct in place. Make sure the flex duct does not sag down. Pull as tight as possible without pinching or tearing the flex duct. Instead of using screws to mount flex duct, duct tape can be used (not supplied).
Mounting a saddle valve (Not Included)
Locate hot (preferred) or cold water pipe. Turn o_ water. Clean the pipe. Be sure the piercing needle is not exposed beyond its rubber gasket. Mount t-bar on top or side of water pipe. Determine the metal type of the water pipe. If water pipe is steel or brass, drill 5/32” hole for piercing needle. Needle will only pierce copper, not steel or brass. Use hand drill to avoid shock hazard. Assemble the saddle valve assembly as shown. Make sure brackets stay parallel. Do not over tighten mounting bolts. Attach water line as shown above. See previous instruction for plastic or copper configuration. Turn t-bar clockwise until you cannot turn anymore. It may have resistance when piercing the copper water pipe. Open valve and drain into a bucket for a few seconds to clean any debris from the water line.
Installing water line to solenoid
A. Install plastic water feed line according to diagram above (insert, plastic grommet, brass nut and plastic tubing). Turn nut clockwise to tighten.
B. Copper tubing installation diagram (brass grommet, brass nut). Copper tubing not included. Some building codes require copper tubing in place of plastic tubing. Check with local ordinances for compliance. Turn on water. Turn the t-bar counterclockwise to open water line to Humidifier. Check for leaks.
Attaching drain hose
C. Attach drain hose to bottom of Humidifier and tighten hose clamp to secure in place.
D. Cut drain hose to appropriate length. Secure drain hose to floor drain. Be sure there are no kinks or tight bends in hose to allow water to drain freely.
Installing Humidifier Filter and frame
Insert Humidifier White Waterpad® Filter into Filter frame with painted mark on top. Insert bottom of Filter assembly into humidifier. Rotate the top of the Filter assembly towards the back of Humidifier. 2 locks will click into place on top and hold the Filter assembly in place. Install Humidifier cover by putting the top side on first, then lowering down bottom to lock into place with 2 locks. For best performance always use BestAir® White WaterPad® #A10-W. BestAir® WaterPad® #A10 can also be used, but will not perform as well.
Mounting Humidistat on wall
See mounting template
1. Turn power to your Humidifier OFF.
2. Select the location for your BestAir Pro Humidistat. Choose a centrally located interior wall away from doors and windows.
Next to your thermostat is a good choice.
3. Using the mounting template, drill the four mounting holes using a 5/64” drill bit. Next drill the hole for the wire leads using a 3/8” drill bit.
4. Run the wire through the wire lead hole to the Humidifier. Make sure you have enough wire to run to the 24 volt transformer as well. (refer to wiring diagram). Leave about 6” of wire sticking out of the hole. This will be connected to the humidistat.
5. Remove the control knob and cover. Fasten the unit to the wall using the screws provided. If you’re fastening to drywall, use appropriate wall anchors (not supplied).
6. Join the wire leads to the wire using the supplied wire connectors.
7. Replace the cover on the unit. Remove the paper backing from the humidistat label and apply to the face of the cover. Attach the knob to the control shaft. Turn knob to the “o_” position.
8. Connect thermostat cable to the Humidifier and transformer.
9. Turn power back on.
10. Adjust the control knob to the desired relative humidity level.
11. Be patient. It will take a day or two for your home to reach the desired relative humidity. Turning the knob to full “on” position, will not speed up the process. Adjust as needed to suit your level of comfort.
Mounting Humidistat on duct
See mounting template
1. Turn power to your Humidifier OFF.
2. The humidistat has been pre-assembled for wall mounting. You’ll need to adapt it for duct mounting.
3. Select a location on the return air duct to mount the humidistat. IMPORTANT! IT MUST BE PLACED UPSTREAM FROM THE HUMIDIFIER OR BYPASS TUBE.
4. Using the mounting template, drill the four mounting holes using a 5/64” drill bit. Next drill the holes for the Humidistat Cutout Area using a 3/8” drill bit. Finally, drill the hole for the wire leads using a 1/4” drill bit.
5. Using tin snips, carefully cut out the opening for the humidistat. BE CAREFUL! METAL EDGES ARE SHARP. Drill four corner holes to start your cut.
6. Install rubber wire hole gasket. Carefully run the wire leads through the lead wire hole and position the humidistat in the humidistat opening.
7. Fasten the humidistat to the duct with screws provided.
8. Remove the paper backing from the humidistat label and apply to the face of the mounting base. Attach the knob to the humidistat control shaft. Turn knob to the “o_” position.
9. Join the wire leads to the wire using the supplied wire connectors.
10. Turn power back on.
11. Adjust the knob to the desired relative humidity level.
12. Be patient. It will take a day or two for your home to reach the level. Turning the knob to “on” position, will not speed up the process. Adjust as needed to suit your level of comfort.
Verify voltage of HUM terminals before wiring. Damage to components will result if incorrectly wired. For easier electrical hookup purchase #BA100. Removes the task of wiring to the blower motor or furnace circuit board. Plugs into standard 120V outlet.
A transformer should be wired in parallel with the furnace blower motor line voltage (1). This will allow the Humidifier to run only when there is a call for a fan. Shut o_ the power before proceeding! Some furnaces have HUM terminals on the circuit board for wiring Humidifiers. If present, check to see if it is 120vac or 24vac. If it is 120vac, connect the transformer primary leads to these terminals (1). If it is 24vac (2), you do not need the transformer. Simply connect one side of the humidistat to one HUM terminal and the other HUM terminal to the solenoid valve of the Humidifier. Then make the last connection of the solenoid valve to the humidistat. If you are using the transformer you will
need to connect the 24vac common from the transformer to one of the solenoid valve wires and then the 24vac hot from the transformer to the humidistat. Then from the humidistat to the other side on the solenoid valve. Make sure not to route wires where they can be burned or chaffed.
With the humidistat set to its highest setting the Humidifier solenoid should open shortly after the furnace blower is activated. If solenoid does not open, refer to the troubleshooting guide. Check if saddle valve is on and damper is open. Inspect for water leaks. Make sure unit drains ok.
Relative Humidity Chart
DO NOT OVER HUMIDIFY
Cold air cannot hold as much moisture as warm air. Any cold drafts or cold-faces such as windows and
doors (including frames and jams) may cause water vapor to condense at these points. Also, if
your home is well insulated and weather-stripped but lacks effective vapor barriers, water may seep
through the walls and ceilings. This moisture may condense either inside or outside the walls or in
the attic. If any of these conditions are observed, the humidity level should be reduced before water
All Humidifiers require some maintenance to keep them operating at peak performance. The #BA3200G has been designed to simplify this maintenance. Routine maintenance should include the following procedures.
1. Annual cleaning and general inspection of unit.
2. Replacement of the White Waterpad® #A10-W Filter (B) twice per Humidifier season. Cleaning of Filter frame (A) when Filter is replaced.
3. Inspection and cleaning/replacement of the solenoid inlet water screen (C). Inspection and cleaning/replacement of the solenoid outlet orifice (D).
4. Inspect drain line (E & F) for clogs that will require cleaning or kinks that may prevent drainage.
Annual Spring Shut-down
Turn off humidistat. Turn off water saddle valve. Close bypass damper. Remove White Waterpad® Filter and discard.
Annual Fall Start-up
Turn on humidistat to desired level. Completely turn on water saddle valve. Open bypass damper. Install new White Waterpad® Filter. Check operation. Temperature Adjust % RH To