Filter
Top Products
Sudden operation may cause personal injury
or property damage. Turn humidistat or
Humidifier Control to “OFF” or lowest setting before servicing.
- 10 -
1. Note Humidifier Control setting and turn dial to the “OFF” position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidifier cover assembly (1) from base assembly (2) at the bottom of the
cover, lift, and set aside.
4. Pull out the humidifier pad assembly (3) by grasping at the top and tipping out.
5. Remove the distribution tray (4) by unsnapping the plastic holding strips from the
tabs at the end of the distribution tray. Lightly scrape out any mineral deposits and
clean the “V” notches (5) but do not scrape off the granular coating from the
bottom. If coating is removed replace distribution tray. This textured surface helps
ensure even water flow for maximum performance.
6. Slide the humidifier pad (6) out from the plastic scale control insert (7). Clean the
insert frame by twisting and flexing it to loosen the mineral deposits or use a putty
knife. Replace humidifier pad annually with a #BAYPAD02A1310A humidifier pad.
Slide the humidifier pad back into the scale control insert with the colored spot up
and snap the distribution tray (4) back into place.
7. Re-install the humidifier pad assembly (3) into the base assembly (2). Push the
assembly (3) in at the top between the retaining ribs that hold the assembly in place
in a vertical position.
8. Remove the drain hose (8) from the bottom of the unit. Bend and flex it to loosen the
internal mineral deposits. Then flush it with water under pressure and slip it back
onto the drain fitting.
9. Reinstall cover assembly (1) by hooking at the top of the base assembly (2) and
latching at the bottom.
10. Reconnect electrical power (9) and turn on the water supply @ saddle valve.
11. Check system operation:
Manual Humidifier Control
: Turn up humidifier control to highest setting and make sure
the furnace and blower are operating. Humidifier will operate if RH is less than 50%.
Automatic Humidifier Control: Check system operation by setting the knob to
“Test.” With furnace and blower operating humidifier will operate for one minute.
12. Set Humidifier Control to its original position.
MAINTENANCE INSTRUCTIONS for
HUMIDIFIER MODEL *HUMD500A
*HUMD500A
54
7
2
6
8
1
90-858
3
9
WARNING
120 volts may cause injury from electrical shock.
Disconnect power and shut off water supply before servicing.
CAUTION
1. Humidifier Cover Assembly
2. Base Assembly
3. Humidifier Pad Assembly
4. Distribution Tray
5. "V" Notches
6. Humidifier Pad
7. Scale Control Insert
8. Drain Hose
9. Power Cord
*MAY BE “A” OR “T”