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 Co

22-5036-01 TABLE OF CONTENTS TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Operating Instructions • Automatic Humidifier Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 • Manual Humidifier Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Effect of Water Characteristics .

The Automatic Humidifier will accurately control the humidity in your home to a maximum of 45% RH and a minimum of 10% RH. The values of outdoor temperature and dial settings may fall in between or outside of the listed values in Table 2. In these cases, you can only approximate your home’s actual indoor RH. - 4 To check the humidifier’s operation, note the current setting and set the Automatic Humidifier Control to the test mode when the furnace blower motor is operating. Water will flow into t