MG3P Installation Manual

5
36 inches is strongly recommended.
Operation of Furnace During Construction
CAUTION:
Failure to follow these instructions will void the
factory warranty and may significantly reduce
the life or the performance of the furnace, and/
or result in other unsafe conditions. It is the
responsibility of the installing contractor to insure
these provisions are met.
Operating gas furnaces in construction environments can cause
a variety of problems with the furnace. Proper use of commercial
portable space heating equipment during construction is
recommended. This gas furnace may be used during construction
if it is not in violation of any applicable codes and the following
criteria are met:
• The installation must meet all applicable codes. The furnace
must be permanently installed according to the instructions
supplied with the furnace. This includes the electrical supply,
gas piping, duct work, and venting. The furnace must be
controlled by a room thermostat properly installed according
to the instructions supplied with the furnace and thermostat.
The installation must include a properly installed air filter in
the return air duct, sealed to the furnace with no by-pass air.
The filter must be inspected frequently and replaced when
necessary.
• The furnace input rate and air temperature rise must be
checked and verified to be within the acceptable ranges as
marked on the furnace nameplate.
• Before occupying the structure: The air filter must be replaced
or cleaned, the duct work must be inspected and cleaned of
any construction debris, and the furnace must be cleaned and/
or repaired if found to be dirty, damaged, or malfunctioning in
any way by a qualified HVAC technician. The furnace shall be
inspected and approved by applicable local authority even if
this requires redundant inspections.
• Serial numbers for furnaces used during construction must
be submitted in writing (fax and email also acceptable). This
information will be used to track the long-term affects of the
use during construction on furnaces. Proof of this submittal
shall be available for the final inspection of the furnace prior
to occupancy.
• This furnace is designed to operate with return air temperatures
in ranges normally found in occupied residences, including
setbacks. Minimum continuous return temperature must not
be below 60° F (15° C). Occasionally a temporary return
temperature of 55° F (12° C) is acceptable. However, operation
with a return temperature below 55° F (12° C) is not allowed.
• The installing contractor and / or builder must:
— Comply with the requirements of this section.
— Complete the attached Use of Furnace During
Construction checklist.
— Email copy of completed Use of Furnace During
Construction checklist to [e-mail]
— Leave original completed Use of Furnace During
Construction checklist with furnace.
— Disclose use of the furnace during construction to the
homeowner in advance of the sale.
Figure 1
CLEARANCES TO COMBUSTIBLE MATERIALS
Left Side ..................... 0 Inches
Top ..............................1 Inch
Right Side .................... 0 Inches Front ............................
†
4 Inches
Vent .............................1 Inch
Back ............................ 0 Inches
†
Allow 24 in. minimum clearance for servicing. Recommended clearance
is 36 in.
TOP
UPFLOW
APPLICATIONS
TOP
FRONT
DOWNFLOW
APPLICATIONS
VENT
VENT
FRONT
BACK
BACK
LEFT SIDE LEFT SIDE
RIGHT SIDE
RIGHT SIDE
Figure 1. Minimum Clearances to
Combustible Materials
methods. Excessive oversizing of the furnace could cause
the furnace and/or vent to fail prematurely. In addition, the
ductwork should be appropriately sized to the capacity of the
furnace to ensure its proper airflow rating. For installations above
2,000 ft., the furnace should have a sea level input rating large
enough that it will meet the heating load after deration for altitude.
Installation in a Garage
WARNING:
Do not place combustible material on or against
the furnace cabinet or within 6 inches of the
vent pipe. Do not place combustible materials,
including gasoline or any other flammable vapors
and liquids, in the vicinity of the furnace.
This Gas-fired furnace may be installed in a residential garage
with the provision that the burners and igniter are located no
less than 18 inches (457mm) above the floor. The furnace must
be located or protected to prevent physical damage by vehicles.
Clearances to Combustible Materials
This furnace is Design Certified in the U.S. and Canada
by CSA International or Underwriter’s Laboratories for the
minimum clearances to combustible material listed in Figure 1.
NOTE: The furnace is listed for installation on combustible or
non-combustible flooring. However, wood is the only combustible
flooring allowed for installation. Downflow models must use the
appropriate subase kit when installing over a wood floor. To
obtain model number and specific clearance information, refer
to the furnace rating plate, located inside of the furnace cabinet.
Access for positioning and servicing the unit must be considered
when locating unit. The need to provide clearance for access to
panels or doors may require clearance distances over and above
the requirements. Allow 24 inches minimum clearance from
the front of the unit for servicing and positioning. However,