Meyer 526, woodchuck, 2900, 4000 manual Air Duct Installation, Add-Oninstallations

MANUAL DAMPER MAY BE INSTALLED BETWEEN BAROMETRIC DAMPER AND CHIMNEY

FIGURE 10 A BAROMETRIC DRAFT REGULA- TOR AND ITS INTENDED EFFECT

AIR DUCT INSTALLATION

SPECIAL AIR FLOW CONSIDERATIONS FOR WOOD/COAL FURNACES

With Wood/Coal furnaces, a special concern is pre- venting wood joists and flooring close to the hot air ducts and plenum from overheating. A fire hazard is created by the hot air flow circulating through ducts not designed for such high temperatures. Most Wood/Coal furnaces produce much hotter air than oil or gas fired units. So most clearances from the existing ducts and plenum are usually inadequate with a supplemental Wood/Coal furnace installation.

When installing the air duct, follow recommended clearances shown in figure 11.

The plenum on the Woodchuck should be 20"x23" and no less than 18" high while maintaining a minimum of 18" clearance to the ceiling or other combustible mate- rial. In a power outage situation, excessive heat buildup at the plenum top may be dangerous, so make sure clearances are maintained. For the Model 4000 allow at least 4" from ceiling to plenum.

The ducts, fittings, grilles and registers should be sized so that the total external static pressure does not ex- ceed .02 W.C. inches while developing air velocities of

With no draft in chimney, regulator is closed, no air gets in.

Moderate suction in chimney pulls regulator open enough to maintain desired draft for appliance.

Excessive suction in chimney pulls regulator further open, allowing substantial air into chimney connector.

600 ft/min to 1000 ft/min at the registers. NEVER sup- ply less than 150 sq. in. of heated air outlet area.

Cold air returns must be at least equal in size to the heated air outlets and preferably 10% larger. Every Wood- chuck furnace MUST be installed with a cold air return.

ADD-ON INSTALLATIONS

Before installing your Woodchuck furnace, consult your furnace man and local state building codes to de- termine if your furnace will accept an add-on applica- tion. Some small furnaces and especially counter-flow furnaces may not be used in add-on installations.

Once it has been determined that your existing furnace will accept an add-on installation, we recommend a parallel installation, with direct (ducted) feed of return air to the Wood/Coal furnace, see figure 12. The back flow prevent damper assures that when either unit is operating by itself, the hot air will flow into the home, and not flow back through the other furnace.

Figure 13 shows a central installation.

We do not recommend supplemental wood furnace installations with series connection. These types of installation are not advisable in spite of their simplicity, see figure 14.

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