Clearances And Accessibility; Existing Furnace Removal - Goodman *MVM96 Installation Instructions Manual

• If the furnace is used in connection with a cooling
unit, install the furnace upstream or in parallel with
the cooling coil. Premature heat exchanger failure
will result if the cooling coil is placed upstream of the
furnace.
For vertical (upflow or downflow) applications, the
minimum cooling coil width shall not be less than
furnace width minus 1". Additionally, a coil installed
above an upflow furnace or under a counterflow furnace
may be the same width as the furnace or may be one
size larger than the furnace. Example: a "C" width
coil may be installed with a "B" width furnace.
For upflow applications, the front of the coil and furnace
must face the same direction.
• If the furnace is installed in a residential garage, position
the furnace so that the burners and ignition source are
located not less than 18 inches (457 mm) above the
floor. Protect the furnace from physical damage by
vehicles.
• If the furnace is installed horizontally, ensure the access
doors are not on the "up/top" or "down/bottom" side of the
furnace.
• Do not connect this furnace to a chimney flue that serves
a separate appliance designed to burn solid fuel.
• On Counterflow Installations, the air conditioning coil must
be downstream on the supply (positive) side of the furnace
heat exchanger.
• 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 Specification Sheet
applicable for 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.)
C A
LEARANCES AND CCESSIBILITY
*MVM96* MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS
POSITION SIDES REAR
Upflow 0" 0"
Horizontal 6" 0"
C = If p laced on combustible floor, floor MUST be wood only.
NOTES:
• For servicing or cleaning, a 24" front clearance is required.
• Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
(INCHES)
FRONT BOTTOM FLUE
3" C 0"
3" C 0"
• In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances
are greater.
*CVM96* MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS
POSITION SIDES
Downflow 0"
Horizontal 6"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
NOTES:
• For servicing or cleaning, a 24" front clearance is required.
• Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
• In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances
are greater.
Installations must adhere to the clearances to combustible mate-
rials to which this furnace has been design certified. The minimum
clearance information for this furnace is provided on the unit's clear-
ance label. These clearances must be permanently maintained.
Clearances must also accommodate an installation's gas, electri-
cal, and drain trap and drain line connections. NOTE: In addition
to the required clearances to combustible materials, a minimum of
24 inches service clearance must be available in front of the unit.
S ID E
U pflow
E F
XISTING URNACE
NOTE: When an existing furnace is removed from a venting sys-
tem 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 Ameri-
can National Standard/National Standard of Canada for Gas-
Fired Central Furnaces ANSI Z21.4, CSA-2.3 latest edition
Section 1.23.1.
The following steps shall be followed with each appliance con-
nected to the venting system placed in operation, while any other
appliances connected to the venting system are not in operation:
1. Seal any unused openings in the venting system;
TOP
2. Inspect the venting system for proper size and horizon-
1"
tal pitch, as required by the National Fuel Gas Code,
6"
ANSI Z223.1 or the Natural Gas and Propane Installa-
tion Code, CSA B149.1-05 and these instructions. De-
termine that there is no blockage or restriction, leak-
age, corrosion and other deficiencies which could cause
an unsafe condition.
9
(INCHES)
REAR FRONT BOTTOM
0" 3" NC
0" 3" C
T O P
S ID E S ID E
B O T TO M
C ou nte rflo w
R
EMOVAL
FLUE TOP
0" 1"
0" 6"
T O P
B O T T O M
H orizo n ta l