Scotsman Ice DB-101 - Manual (Page 16)

SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
Scotsman Oct-06 15
2.7 DUCT CONNECTION (Fig S101-5, Fig S101-1)
See figure S101-12 for Approved Furnace Ductwork Configurations.
See figure S101-13 for Prohibited Furnace Ductwork Configurations.
The use of A/C coils is not recommended unless special arrangements are made.
Minimum cross-sectional area of ductwork from furnace should be approximately 180
sq. in. with equal or larger size for return air.
The furnace must not be installed as a gravity system as the controls are not designed
for this type of operation.
The dimensions and locations of permissible openings in casings for ducts, blower, or
emergency air are clearly identified on the furnace or on specific templates enclosed in
the firebox.
DO NOT use duct elbows having an inside radius of less than 6 in (155mm). Use only
16 x 20 in. duct “S” type interconnection for this furnace.
Make or enlarge the openings in the wood furnace casing exactly as identified for add-
on connection and on the appropriate side, trim the furnace insulation flush with cut
opening. Fasten edges of insulation securely with metal straps or bend tabs of duct
starting collar over insulation edge to hold it in place.
Make all duct connections for the “S” type interconnection (See Fig S101-5).
CAUTION - The DB-101-ADD is NOT certified for installations using a divider in the
plenum of the oil furnace. An ADD-ON unit must only be connected to a furnace, duct
system and chimney, which are in good operating condition. DO NOT relocate any of
the safety controls in the original furnace installation. Operate the oil-fired unit
periodically to ensure that it will operate satisfactorily when needed.
DO NOT connect to duct work so that a reverse flow is possible. Before attempting
installation, determine if there is suitable space available in the furnace area for the
furnace connection outlined herein.
The external static pressure in the warm air duct to the house of the original system
must be measured prior to any changes to the system. These are to be reset to the
same values after the add-on procedure to maintain airflow through the oil furnace.
An important requirement of this type of installation is that when installed in an existing
system the main ducts may have to be lowered to assure proper and safe clearances
from combustible material. (See Fig S101-1).
After all connections are made a static pressure test and/or temperature measurement
must be made in the outlet plenum of the wood furnace. This is a simple procedure and
is outlined as follows using a Dwyer Model 25 or equal inclined manometer:
Drill hole in wood outlet plenum.
Level inclined manometer and adjust to zero, insert manometer tube (Pressure end).
With all duct work and doors in place static pressure should measure 0.2 in (50 Pa) with
blower running.