Parallel Installation - CADDY PF01015 Installation And Operating Instructions Manual

PARALLEL INSTALLATION

The installation of the Caddy with another furnace using the same ductwork is not allowed in Canada. This type of
installation is only allowed in the United States. Ideally, the maximum BTU input of the existing oil, gas, or electric
furnace should be equal or higher than the maximum BTU input of the wood furnace. It is mandatory to respect
minimum clearances between the ductwork and combustible material as if the wood furnace was installed as a
standalone unit. The ductwork and furnace should be adjusted in order to reach a static pressure of at least 0.20
IN.WC, but not more than 0.50 IN.WC. A back-flow damper should be installed in the plenum. The back-flow damper
assures that when either unit is operated by itself, the hot air will flow into the home, and not back through the other
furnace. Depending on your installation (see figures examples below), a back-flow damper may be required in each
plenum.
CANADA; The installation in parallel i.e. the Caddy furnace combined with another, using the same system of hot air
ducts is not allowed in Canada.
UNITED STATES; The installation in parallel i.e. the Caddy furnace combined with another, using the same hot air
duct system is allowed the United States.
Conditional to;
The maximum input power of the existing gas, oil or electric furnace should be equal or lower than 120 000
o
Btu/h.
The clearances required for wood furnace must be respected.
o
The clearances between the hot air ducts and combustible materials must meet the highest values between
o
the two furnaces.
The necessary adjustments are made to the furnace or hot air ducts to maintain a static pressure of between
o
0.20 and 0.50 IN.W.C.
A backflow damper must be installed to prevent air return in one or the other of the two furnaces and to ensure
o
that hot air will flow into the house and will not return through the plenum of the other furnace. Depending on
your system configuration, it is possible that more than one register is required to prevent air returns in the
different hot air ducts (see examples below).
40