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8. Replace the orifice and reconnect the outlet water line. (Double Wrench To Prevent Leaking.) 9. Turn on water supply @ Saddle Valve and reconnect electrical power to the furnace. - 8 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 6 5 8 2 7 1 3 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. CAUTION! *HUMD200A, *HUMD300A 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 ...

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