I.C.E. GIDM-325 - Manual (Page 3)

2
For service, it is advisable to maintain a minimum 24-inch clearance on the side opposite the controls and 42-inch
clearance on the control side. If this unit is to be operated within a confined space or within a building of unusually
tight construction, air for combustion and ventilation must be obtained from outdoors or other spaces freely
communicating with the outdoors. At least one square inch of free area per 1000 Btuh of total input rating of all
appliances within the space provided up to 400,000 Btuh. Refer to CAN/CSA/1-B149.1 natural gas, or
CAN/CSA/1- B149.2 and B139, propane gas and B139 for air supply requirements of appliances heating input
exceeding 400,000 Btuh. For USA units refer to ASSI Z223.1 section 1.3.4.2 and 1.3.4.3 for combustion air
requirements.
Ducts connected to the furnace shall have removable access panels on both the upstream and downstream sides of
the furnace. These openings shall be accessible when the furnace is installed and shall be sized to allow the
observation of smoke or reflected light inside the casing to indicate the presence of leaks in the heat exchanger. The
covers for the openings shall be attached in such a manner as to prevent leaks.
The furnace must not be operated in the presence of chlorinated vapors. When such vapors mix with the products of
combustion, highly corrosive compounds result which will cause the premature failure of the heat exchanger and
other components, voiding the warranty.
CONNECTING THE FLUE
In making flue connections to the unit, observe the following general recommendations. In addition, these
connections must conform to the requirements of current CAN/CSA/B149.1 natural gas and CAN/CSA/ B149.2 and
be in accordance with provincial and local authorities who have jurisdiction. For USA units, all venting installations
shall be in accordance with the latest edition of Part 7, “Venting of Equipment”, of the National Fuel Gas Code,
ANSI Z223.1-1992 (or the latest edition), or applicable provisions of local building codes.
*See Fig. II and Fig. III for C vent system.
*Some jurisdiction may require a positive pressure vent system.
*The flue must be securely attached to the unit with tight joints.
*The pipe from the unit to the flue should rise at least ¼ inch per foot.
*The flue must not be sized to have a cross-sectional area less than that of the flue collar at the
unit. See Fig. II and Fig. III.
*Other appliances must not be connected so as to vent through the flue of this unit.
*Do not use 90-degree tees or elbows greater than 45 degrees.
*Do not support the weight of the stack on the flue connection of the heating section.
*Minimize connecting pipe length and the number of bends by locating the unit as close to the flue pipe as
possible.
*Maintain clearances between the flue pipe and combustible materials that are acceptable to the federal,
provincial and local authorities having jurisdiction.
*Unit must be connected to a flue having sufficient draft to ensure proper operation of the unit.