SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
Scotsman
Jun
-10
13
2.6.2 ADD-ON
(Fig. S101-7, Fig. S101-12)
The wood furnace may be installed very satisfactorily in conjunction with another furnace as
tested by ETLM under standard 78-1 and CSA under standard B365/1981.
In this installation the wood furnace is connected downstream in series with a new or the
existing oil furnace. The blower from the existing furnace provides the air circulation. The
wood furnace may only be added in series downstream from an oil furnace having an input
rating (on original nameplate) of between 0.85 and 1.50 gph (US) or SI equivalent.
For oil furnaces having multi-speed blowers with continuous circulation capability
.
Add-on furnaces such as the Scotsman can be installed with oil fired warm air furnaces such
as the Kerr KD Gemini that have continuous blower circulation capability. A relay must be
used if the furnace is to maintain the continuous circulation feature. The wiring diagram for this
installation is Fig. S101 – 7, Fig. S1019.
Disconnect Low Speed Circulation Fan Switch if Optional Relay is not used.
Fig. S101 – 8, Fig. S101-10.
Disconnecting the circulation fan low speed switch.
If the red wire from the circulation fan switch, in the furnace wiring box, were disconnected
from the yellow wire leading to the blower compartment and both, red and yellow wires
marretted off then there would be no need for the switching relay (Honeywell R4222D 1013 or
equiv.).
In that case the two blue wires would marrette together at location “A” of “Add-On Wiring”
diagram, and provide power to the blower on high speed (black wire). The two blue wires
being 1.) Wood fan “ON” control and, 2.) Oil fan “ON” control. Also 120 Volts can be fed back
through any unused wire from the blower. All unused wires should be marretted off.
Low Speed Switching Relay (This is an optional part) Fig. S101 – 7, Fig. S101-9.
The Honeywell (R4222D 1013 or equiv.) relay is to prevent power from being fed to the blower
motor on two motor windings at the same time.
The red wire from the circulation fan switch (Low Speed) on the oil furnace.
The blue heating wire from the wood fan limit control on high speed.
This relay will disconnect the circulation fan low speed switch and connect the high speed to
the blower motor when there is a call for heat.
Items required
:
o
Switching Relay R4222D 1013 (120 V Coil, 12 amp @ 120 Vac), or equivalent.
o
Junction box (4” x 4”) and cover.
o
Square extension box (4”x 4” gyproc extension).
o
Two plastic universal bushings or junction box connectors.
o
White wire (12”), two insulated spade connectors.
o
Black wire (6”), two insulated spade connectors.
o
Brown wire (12”), two insulated spade connectors.
o
Yellow wire (12”), two insulated spade connectors.
o
Two cabinet mounting screws.
