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Model 550-560


Research Products


CAUTION! Sudden operation may cause personal injury or property damage. Turn humidistat or Control to "off" or lowest setting before servicing.

  1. Front Cover
  2. Feed Tube
  3. Nozzle
  4. Water Panel Evaporative Assembly
  5. Distribution tray
  1. "V" Notches
  2. Water Panel
  3. Scale Control Insert
  4. Drain Hose

Maintenance Instructions

  1. Note humidistat or 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. Carefully pull the plastic feed tube (2) out of the nozzle (3) at the top of the Water Panel evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.
  5. Remove the black plastic distribution tray (5) from the evaporative assembly by unsnapping the white plastic holding strips from the tabs at the end of the tray. Lightly scrape out any calcium 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. See page 2 if removed.
  6. Slide the Water Panel evaporator (7) out from the white plastic Scale Control Insert (8). Clean the insert frame by twisting and flexing it to loosen the calcium deposits, or use a putty knife. Inspect the Water Panel evaporator (Stock No. 10 for Model 550 and Stock No. 35 for Model 560) and substitute a new one if necessary. Slide the pad back into the insert frame with the black colored spot up and snap the black distributor tray back into place.
  7. Re-install the Water Panel evaporative assembly into the unit by fitting its drain tube into the round receptacle at the base of the unit. Push the assembly in at the top against the beveled tabs 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 (9) from the bottom of the unit and bend and flex it to loosen the internal calcium deposits. Then flush it with water under pressure and slip it back onto the black drain fitting.
  9. Turn on water supply.
  10. Check system operation:
    Manual Humidistat: Turn up humidistat to highest setting and make sure the furnace blower is operating. Humidifier will operate if RH is less than 50%.
    Auto Trac Control System: Check system operation by setting the knob to "Test". With furnace blower operating and furnace calling for heat, humidifier will operate for one minute.
  11. Set humidistat or Control to its original position.



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Copyright © 2002,2003 Morrison Mechanical
Last modified:
November 12, 2003