Clearances And Accessibility; Horizontal Installation; Furnace Suspension; Existing Furnace Removal - Goodman GMH8 Installation Instructions Manual

located n otlessthan18inches ( 457 mm) a bove thefloor.
Protect thefurnace f romphysical damage b yvehicles.
• If thefurnace i s installed h orizontally, thefurnace a ccess
doors must b evertical sothattheburners firehorizontally
intotheheatexchanger. Donotinstall theunitwiththe
access d oors onthe"up/top" or"down/bottom" sideofthe
furnace.
• Donotconnect this furnace t oa chimney fluethat s erves a
separate a ppliance designed t oburnsolidfuel.
• OnCounterflow installations, theairconditioning coilmust
bedownstream from theheat e xchanger ofthefurnace.
•
Counterflow Installation over a noncombustible floor.
Before setting the furnace over the plenum opening, ensure
the surface around the opening is smooth and level. A tight
seal should be made between the furnace base and floor
by using a silicone rubber caulking compound or cement
grout.
• Counterflow Installation over a combustible floor. If
installation over a combustible floor becomes necessary,
use an accessory subbase (see Product Data Book
applicable to your model* for details). A special accessory
subbase must be used for upright counterflow unit
installations over any combustible material including wood.
Refer to subbase instructions for installation details.
Follow the instructions with the subbase for proper
installation. Do not install the furnace directly on carpeting,
tile, or other combustible material other than wood flooring.
(Note: The subbase will not be required if an air
conditioning coil is installed between the supply air opening
on the furnace and the floor.)
Vent Pipe Clearance to Combustibles-
6" using Single Wall Connector or 1"
using B-I vent.
Side
Clearance
Front Clearance - 3"
• Adequate combustion/ventilation air must be supplied to
the closet.
• Furnace must be completely sealed to floor or base.
Combustion/ ventilation air supply pipes must terminate
12" from top of closet and 12" from floor of closet. DO NOT
remove solid base plate for side return.
• Return air ducts must be completely sealed to the furnace
and terminate outside the enclosure surfaces.
CLEARANCES AND ACCESSIBILITY
Unobstructed front clearance of 24" for servicing is
recommended.
VENT
SIDES FRONT BACK
BI-VENT I SINGLE
I" 6" 1" 3" 0"
Top clearance for horizontal configuration - 1"
TOP
(PLENUM)
I"
HORIZONTAL INSTALLATION
Line contact to framing is permitted when installed in the horizontal
configuration. Line contact is defined as the portion of the cabinet
that is formed by the intersection of the top and side,
ACCESSIBILITY CLEARANCE,WHERE GREATER, SHOULD TAKE
PRECEDENCE OVER MINIMUM FIRE PROTECTION
CLEARANCE. A gas-fired furnace for installation in a residential
garage must be installed so that the ignition source and burners
are located not less than eighteen inches (18") above the floor
and is protected or located to prevent physical damage by vehicles.
A gas furnace must not be installed directly on carpeting, tile, or
other combustible materials other than wood flooring.
FURNACE SUSPENSION
If suspending the furnace from rafters or joist, use 3/8" threaded
rod and 2"x2"x3/8" angle iron as shown below. The length of rod
will depend on the application and the clearances necessary.
PROVIDE 8" MINMUM CLEARANCE BETWEEN
CENTER ROD AND FURNACE CABINET
3/8" DIAMETER
HOL" tTOW
E°;;°tT
2" X 2" X 3/8"
ANGLE IRON
POSITION AS CLOSE AS POSSIBLE
{3 PLACEE)
TO BLOWER DECK TO ALLOW FOR
CIRCULATOR BLOWER REMVOAL
ASSURE FURNACE IS LEVEL FROM
END TO END AND HAS A SLIGHT
FORWARD TILT WITH THE FRONT
OF THE FURNACE 0"-3/4"
BELOW THE BACK OF THE FURNACE
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR BLOWER
REMOVAL
Suspended Furnace
EXISTING FURNACE REMOVAL
NOTE: When an existing furnace is removed from a venting system
serving other appliances, the venting system may be too large to
properly vent the remaining attached appliances.
The following vent testing procedure is reproduced from the
American National Standard/National Standard of Canada for
Gas-Fired Central Furnaces ANSI Z21.47-Latest Edition, CSA-
2.3-Latest Edition Section 1.23.1. The following steps shall be
followed with each appliance connected to the venting system
placed in operation, while any other appliances connected to the
venting system are not in operation:
a. Seal any unused openings in the venting system;
b. inspect the venting system for proper size and horizontal
pitch, as required by the National Fuel Gas Code, ANSI
Z223.1 or the CAN/CSA B149 installation Codes and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deficiencies which
could cause an unsafe condition;