Flow Thru Self Cleaning Furnace HUMIDIFIER

Drum M400

This unique, automatic self-cleaning system allows for a twice daily flushing of the water pan (one gallon on average). This means that in addition to being an extremely clean and efficient humidifier it minimizes water consumption. The drum rotation is automatically monitored and draining is actuated at regular intervals so as to maintain the cleanliness of the water.  This unique feature allows the unit to remain low-maintenance by reducing minerals and bacterial deposits on the pad and in the water pan.

Good for homes of up to 2700 sq. ft

Do it yourself   $138.88    See Installation

Typical humidifier installations:
There are two frequently encountered types of installations: LOWBOY furnace and HI-BOY furnace. Fig. 1

Principles of operation:

• This humidifier uses a motor driven evaporator pad. Warm air is by-passed from the warm air plenum and forced through the evaporator pad while it turns in the water pan. Humid air is drawn back into the return duct.

M 400 Self cleaning model:

• Normally, when the warm air of the furnace flows through the humidifier, it evaporates the water contained in the foam pad, leaving behind mineral deposits.
• In the self-cleaning humidifier, the principle is to eliminate a small quantity of water containing a higher level of minerals before filling the unit with fresh water. The concentration of dissolved minerals will remain low, thus leaving few or no deposits on the parts which contact the water. Environmentally, when compared to flow-through models, this unit is extremely friendly (as low as a few pans per day) and the only thing you will have to do is to clean the water pan and the float with hot water every three months.
• The draining mechanism must be installed in the front right corner of the pan. Actuated by a paddle wheel, it opens a valve every eight turns of the drum for one minute each time, thus allowing a very controlled water discharge.
  NOTE : The quantity of minerals dissolved in the water may vary from town to town, thus providing variable results.

Humidifier location:

• It is strongly recommended to install this humidifier on the return duct (cold air). If for any reason you install it on the supply duct, the functioning and the efficiency won't be affected but the air pressure in the supply duct may lift the cover so that you eventually will have to attach it with adhesive tape or by other means.
• Identify the return duct and choose the duct side which offers the best access for installation and maintenance.
• The humidifier must be installed in such a way that if a leak occurs, the water could not cause any damage to the property.

Controlling the humidity level

• A relative humidity environment of 40% is recommended. However, you should take the outside temperature in consideration before setting the humidity level in order to avoid condensation on the windows. Please refer to the table on the Humidistat to help determine the proper level.
• Each adjustment of the Humidistat should be followed by a period of 24 hours to allow the general humidity level to stabilize in the house.  Following a new humidifier installation, a house may need as much as 3 week to reach target humidity level. Most homes are very drain and will absorb every bit of humidity you first give it.
• If your house remains unoccupied during the winter season, adjust the Humidistat to a lower set point to prevent condensation.

Humidifier maintenance tips:

• Neither stop nor rotate the drum manually. Do not remove the drum when it is rotating as it may cause permanent damage to the motor.
• Check the evaporator pad yearly and replace it if required.
• Depending on the water quality, the water pan and the float should be cleaned once a month.

M 400 SELF CLEANING MODEL:
The draining system should also be cleaned once a year. Remove the screws (16.3) at the top of the plastic box and carefully pull the little plunger (16.1). Wash the plunger and the inside of the box with a little brush. Then reassemble the draining unit in the reverse order. Please refer to Fig 16. 

Summer season

• If the system is used in air conditioning during the summer, reduce the air volume going through the humidifier by closing the air damper.
• It is advisable to simply shut off the humidifier system:
  1 - Close the water supply valve. Do not use the lever on the automatic valve, which is reserved for short maintenance periods.
  2 - Turn the Humidistat knob to the "OFF" position.
  3 - Unplug the transformer.
  4 - Empty and clean the water pan.