400 D / 800 D
M-300 / M-400
Installation Instructions for Furnace Humidifier
Plastic Models - Standard and Self-cleaning
Please read the instructions carefully before starting the installation.
For future use, please copy the free help line number into the space below.
Version 3 - June 2001
Free help line for technical assistance:
1-800-879-0123
BEFORE YOU START - GENERAL SAFETY AND INSTALLATION PRECAUTIONS
Self-cleaning model:
Please read and understand these instructions fully before you begin this installation and save them for future reference.
The manufacturer will assume no responsibility and the warranty will be void if the user does not adhere to the following precautions.
WARNINGS AND DISCLAIMER
Installation Precautions
1) This humidifier will be connected to and used under water pressure and it must be installed in such a way that if a leak
occurs, the water could not cause any damage to the property. Make sure all water connections are properly installed or water
spill could occur.
2) This humidifier is intended for use on forced warm air circulation furnaces, as well as multi-fuel furnaces where temperature
does not exceed 180°F (82ºC). Higher temperatures will damage your humidifier and possibly cause overflow condition and
water damage to your home.
3) Do not install a humidifier where surrounding temperatures may be 32°F (0ºC) or colder. Freezing water will damage the
humidifier and burst the supply pipe, resulting in home damage.
4) Do not install the humidifier or the bypass connection directly on the furnace housing.
5) Do not install the humidifier or the bypass connection on a plenum side where a cooling coil could restrict or inhibit the
airflow through the humidifier.
6) Always check that you are not about to cut or drill into any air conditioning or electrical accessory during installation.
7) Do not install a humidifier on the supply duct where the static pressure exceeds 0.4” Water Column.
8) Do not install a humidifier if the city water pressure exceeds 90 psi. Check the local codes related to pressure reduction.
9) The installation, wiring and plumbing of the humidifier must comply with national and local electrical, plumbing and building
codes.
10) Electrical wiring and water tubing must not come into contact with sharp edges or hot surfaces. For the drainable models,
please make certain the drain tube has no bends, its end placed in a floor drain and there is no resistance to the flow of the
discharged water.
11) The transformer supplied is rated for 120 V power supply. Do not connect it to an installation supplied with another voltage.
12) Do not set the humidity level higher than normally recommended, or condensation damage could occur.
Safety Warnings
1) Please beware of sharp edges when you cut into a metal duct.
2) Always shut the power off before starting the installation. An electric shock from 120 volts could cause serious injury.
All instructions pertinent only to the self-cleaning model are shaded in the following text.
The drum contains all the small parts and installation hardware. It is closed by a round metal damper (10.B) that will be used
later in the installation process. Open the drum to remove all the parts, then re-assemble the drum without the damper.
1. Required tooling
Tin snips, 3/32” drill, pliers, screwdrivers, electric drill, hammer, centre punch, medium sandpaper.
IMPORTANT NOTE: This humidifier is supplied with RECEX ® screws that allow the use of either a Robertson or Phillips
head screwdriver.
2. Typical installations (Please see Fig. 1)
There are two frequently encountered types of installations: LOWBOY furnace (1.1) and HI-BOY furnace (1.2).
3. 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.
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 high 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 that
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.
In one of the front corners of the pan will be the drain mechanism. 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.
4. Humidifier location (Please see Fig. 1, 2 and 3)
• This humidifier should be installed on the return duct (cold air). If for any reason you must install it on the supply duct, the
air pressure may lift the cover and you will have to attach it.
• 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.
5. Preparing the humidifier
This humidifier is factory assembled with the air inlet located at the left side, thus the motor will be installed on the right side.
Everything is reversible, if necessary. However, if it is suitable as supplied, please go directly to Step 6 (Installing the
humidifier).
If humidifier reversal is necessary, do the following (please see Fig. 12)
Lift the front of the water pan to disengage it from the sides of the humidifier and slide it out of the unit.
• Remove the two screws (12.1) located at the top of the humidifier body.
• Open the two sides (12.2) of the humidifier.
• Bend the two sides in the opposite direction and finish with the top.
• Put the two screws (12.1) back in place, taking care to not strip the plastic material.
6. Installing the humidifier (Please see Fig. 2, 3 and 4)
• Please refer to the general view of a typical installation.
• Shut off the furnace power.
• Kit No. 1 contains all the material you need to install the humidifier body.
• Choose the location of the template and make sure that a distance of approximately 14” between the furthest left vertical
line of the humidifier opening and the centre of the air take-off collar can be obtained. (Please see Fig.2).
• This 14” dimension is given for a typical installation. Some installations may differ.
• Apply the humidifier template (#1) on the return duct, level it and then attach it to the duct.
• Starting from the vertical line of the opening (the one closest to the warm air duct), measure 14” and mark the centre of
the air take-off opening.
Warning: Always check that you are not about to cut or drill into any air conditioning or electrical accessory during
installation.
• Center punch the four screw holes and the four corner holes through the template and pierce the duct with a 3/32” drill.
• Remove the template. Join the four corner holes with a marker line. Make a starting hole and cut a rectangular opening
that will correspond to the back opening of the humidifier (7-3/4” x 6-1/2”).
• Install the humidifier in the opening and attach it with the four screws #8 x 3/4”. The ribs around the humidifier back
opening must fit into the rectangular opening in the duct. Check that the humidifier body is level from side to side and from
back to front. Then fasten the humidifier to the duct.
• Fasten the motor (4.1) to the opposite side of the air intake. Kit No. 5 contains the motor (4.1) and two screws (4.2).
7. Installing the air take-off collar (Please see Fig. 2 and 10)
• Center the air take-off collar on the point previously marked on the warm air duct.
• Hold the collar (2.3) on the duct and mark the four fastening holes and the inside zone of the collar.
WARNING: Always check that you are not about to cut or drill into any air conditioning or electrical accessory during
installation.
• Drill the four fastening holes (3/32” dia).
• Make a starting hole and cut a round opening for the air take-off collar.
• Fasten the air take-off collar to the duct with screw #1 while making sure that the air damper is installed between the collar
and the air duct. The hole on the outer edge of the air damper should line up with hole #1 of the take-off collar, and the
finger pull protrudes outward (Fig. 10A).
• Install screws #2 and #3.
• Close the opening to approximately 50%.
• Install screw #4 by piercing the damper, which will hold it in position.
• OPTIONAL: If the damper is snugly in place and can remain in a fixed position, screw #4 may be left out. This will allow
The water pan and the draining system have to be assembled.
SELF CLEANING MODEL:
for easier opening and closing of the air damper.
8. Installing the flexible duct (Please see the general view Fig. 2)
• Measure the required flexible duct length necessary to connect the humidifier to the air take-off collar (2.3), so it does not
sag.
• Cut the excess portion.
• Slide the flexible duct (2.1) on the air take-off collar (2.3) and secure it by inserting the plastic pins (2.2) through the vinyl
in between two reinforcement wires.
• Repeat this operation at the humidifier side.
9. Installing the automatic valve (Please see Fig. 4, 5 and 7)
• Kit No. 2 contains all the material you need to install the automatic valve.
SELF-CLEANING MODEL: The automatic valve must be installed on the same side as the air intake.
• Remove the oblong knock-out to open a hole where the valve has to be installed.
• Install the valve (7.1) inside the casing and fasten it with the hexagonal plastic nut (7.4). The valve body is held in a
vertical position by two ribs (4.4) of the humidifier body.
• Take the float (7.3) and install it behind the valve lever (7.2) with the pivot pin (7.5) fitted in the round hole.
• Insert the screw (7.6) in the kidney-shaped opening through the valve lever (7.2) and the float arm (7.3) and screw it into
the nut (5.1) installed in the hexagonal housing of the float arm.
• Partially tighten the screw (7.6).
10. Preparing the water pan (and the draining system if necessary) Please see Fig. 15
If this humidifier is a non-self cleaning model, no special preparation is necessary and the water pan is ready to install as is.
Please go directly to step 11.
SELF-CLEANING MODEL:
• The draining system must be installed on the same side as the motor.
• The water pan has two round knockouts on the bottom of the pan, located at the front left and right side.
• Locate the knockout that is closest to the motor and mark it on the bottom of the pan.
• Carefully make the appropriate round opening by knocking it with a flat screwdriver and a hammer.
• The drain mechanism is factory-assembled to be installed on the right side of the pan. If the motor is on the right side, then no
change is necessary.
• If the knockout hole is not big enough to receive the drain mechanism, enlarge it a little bit with a small cutter.
• Install the drain box in the water pan, the two screws of the cover towards the back of the pan. The box (15.2) has to sit between
the ribs (15.6) in the water pan. The paddle wheel (15.7) is on the right side.
• Make sure the rubber “O” ring (15.3) is between the drain box housing (15.2) and the bottom of the water pan (15.1).
• Secure the drain box (15.2) to the water pan (15.1) with the plastic nut (15.4), without stripping.
• If the motor is on the left side of the humidifier, the draining system must be reversed. Please do the following:
• After having opened the left knockout hole, install the draining system in hole of the water pan as described above.
• The paddle wheel (17.5) is still on the right side.
• Remove the two screws (16.3) retaining the cover (16.4) and open the draining mechanism.
• Carefully lift the inside plunger (16.1) and the spring (16.2) and remove them from the box.
• Observe how the shaft is positioned. Please note that the two ribs (17.3) on the shaft (17.2) are sitting on the right wall of the box
• (17.1). Take the shaft and flip it so the paddle wheel (17.5) is on the left side, the two ribs (17.3) on the shaft sitting now on the left
wall of the box (17.4).
• Put the plunger (16.1) back in its original position, then reinstall the spring (16.2) in the middle of the plunger.
• Hook the plastic cover (16.4) in the front wall of the box, making sure that the spring (16.2) sits around a plastic protrusion (16.5) in
the center of the cover (16.4).
• Carefully put the two screws (16.3) back in place to hold the cover, without stripping.
• The draining system is now reversed. Turn the paddle wheel by hand to make sure it turns freely and that it stops positively every
1/8 of a turn.
11. Installing the pan into the humidifier
• Slide the water pan into the humidifier, between the two plastic rails located at the sides of the unit.
• Slightly open the sides of the humidifier and insert the two side tabs of the water pan into the two rectangular holes (4.5)
in the sides of the humidifier.
• Push the front of the water pan down to snap the two tabs in the sides of the humidifier.
• Push one end of the drain hose (11.3) onto the draining system connector (11.2). The other end must be connected to a drain.
• Please install the tubing as vertical as possible and do not leave bends where water could accumulate between draining periods,
thus allowing minerals to build-up deposits in the tubing.
• The housing of the draining system is designed to protect against failure. Any overflow would be drained immediately.
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