MAINTENANCE INSTRUCTIONS for
HUMIDIFIER MODELS *HUMD200A, *HUMD300A
Sudden operation may cause personal injury or
property damage. Turn humidistat or humidifier control to “OFF” or
lowest setting before servicing.
1. Front C
2. Drain H
3. Bypass
4. Water P
Assem
5 Distribu
4
56
8
72
31
90-820
- 9 -
1. Front Cover
2. Drain Hose
3. Bypass Damper
4. Humidifier Pad
Assembly
5. Distribution Tray
6. ”V” Notches
7. Humidifier Pad
8. Scale Control Insert
*MAY BE “A” OR “T”
1. Note humidifier control setting and turn dial to the “OFF” position.
2. Turn off water supply.
3. At the side of the unit opposite the airflow duct pull front cover (1) off holding with
both hands and set aside.
4. Pull out the humidifier pad assembly (4) by grasping at top and tipping out.
5. Remove the plastic distribution tray (5) from the humidifier pad assembly by
unsnapping the plastic holding strips from the tabs at the end of the tray. Lightly
scrape out any mineral deposits and clean the “V” notches (6), but do not scrape
off the granular coating from the bottom.This textured surface helps ensure even
water flow for maximum performance. If coating is removed replace distribution tray.
6. Slide the humidifier pad (7) out from the plastic Scale Control Insert (8). Clean the
insert frame by twisting and flexing it to loosen the calcium deposits, or use a putty
knife. Replace the humidifier Pad annually with a #BAYPAD01A1010A humidifier pad
for Model HUMD200A and #BAYPAD02A1310A humidifier pad for Model
HUMD300A. Slide the pad back into the insert frame with the colored spot up and
snap the distributor tray back into place.
7. Re-install the humidifier pad assembly into the unit by fitting its drain into the round
receptacle at the base of the unit. Push the assembly in at the top against the
retaining ribs that will hold it in place. Push the end of the feed tube back firmly into
the nozzle and replace the front cover.
8. Remove the drain hose (2) from the bottom of the unit and bend and flex it to loosen
the internal mineral deposits. Then flush it with water under pressure and slip it
back onto the black drain fitting.
9. Turn on water supply @ saddle valve.
10. 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.
11. Set humidifier or control to its original position.