PRODUCT DESIGN
4
4. Installer must supply the following gas line fittings, de-
pending on which entrance is used:
Left
-- Two 90° Elbows, one close nipple, straight pipe
Right
-- Straight pipe to reach gas valve.
Accessibility Clearances (Minimum)
POSITION*
FRONT
SIDES
REAR
TOP FLUE
FLOOR
Upflow
3
0
0
1
0
C
Horizontal
3
6
0
6
0
C
*= All positioning is determined as installed unit is viewed from the front.
C= If placed on combustible floor, floor MUST be wood only.
GMV95 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
NC= For instalaltion on non-combustible floors only. A combustible
subbase must be used for installations on combustible flooring.
36" at front is required for servicing or cleaning.
Note: In all cases accessibility clearance shall take
precedence over clearances from the enclosure where
accessibility clearances are greater. All dimensions are
given in inches.
High Altitude Derate
When this furnace is installed at high altitude, the appropriate
High Altitude orifice kit must be installed. This is required
due to the natural reduction in the density of both the gas
fuel and combustion air as altitude increases. The kit will
provide the proper design certified input rate within the
specified altitude range.
Natural
Propane
Natural
Propane
Natural
Propane
GMV950453BX*
GMV950704CX*
No
Change
LPM-05*
#55 Orifice
No
Change
HANG13
#44
Orifice
HALP11
#56 Orifice
HAPS28
HANG14
#45
Orifice
HALP11
#56
Orifice
HAPS28
GMV950905DX*
GMV951155DX*
No
Change
LPM-05*
#55 Orifice
No
Change
HANG13
#44
Orifice
HALP11
#56
Orifice
HAPS29
HANG14
#45
Orifice
HALP11
#56
Orifice
HAPS29
9,001 - 11,000 Feet
"STANDARD" and "HIGH ALTITUDE" KITS
Furnace
ID Blwr
Pressure
Switch
Gas Orifices
0 - 7,000 Feet
(Standard Altitude)
7,001 - 9,000 Feet
Gas Orifices
ID Blwr
Pressure
Switch
ID Blwr
Pressure
Switch
Gas Orifices
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Refer to
the chart above for a tabular listing of appropriate altitude
ranges and corresponding manufacturer’s high altitude Natural
Gas and Propane Gas kits. For a tabular listing of appropriate
altitude ranges and corresponding manufacturer's High Altitude
Pressure Switch kits, refer to either the
Pressure Switch Trip
Points & Usage Chart
in this manual or the
Accessory Charts
in Service Instructions.
General Operation
The GMV95 furnaces are equipped with an electronic ignition
device to light the burners and an induced draft blower to
exhaust combustion products.
An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access doors in place
except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic
control module. In the event a furnace component is not
operating properly, the control module LED will flash on and
off in a factory-programmed sequence, depending on the
problem encountered. This light can be viewed through the
observation window in the blower access door. Refer to the
Troubleshooting Chart for further explanation of the LED codes
and Abnormal Operation - Integrated Ignition Control section
in the Service Instructions for an explanation of the possible
problem.
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning
Contractors of America.
*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018
Location Considerations
•
The furnace should be as centralized as is practical
with respect to the air distribution system.
•
Do not install the furnace directly on carpeting, tile, or
combustible material other than wood flooring.
•
When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 1/8” angle as shown
in the Installation and Service Instructions. The length
of the rod will depend on the application and clearance
necessary.
•
When installed in a residential garage, the furnace must
be positioned so the burners and ignition source are
located not less than 18 inches (457 mm) above the
floor and protected from physical damage by vehicles.
Notes:
1. Installer must supply one or two PVC pipes: one for com-
bustion air (optional) and one for the flue outlet (required).
Vent pipe must be either 2” or 3” in diameter, depending
upon furnace input, number of elbows, length of run and
installation (1 or 2 pipes). The optional Combustion Air
Pipe is dependent on installation/code requirements and
must be 2” or 3” diameter PVC.
2. Line voltage wiring can enter through the right or left side
of the furnace. Low voltage wiring can enter through the
right or left side of furnace.
3. Conversion kits for propane gas and high altitude natural
and propane gas operation are available. See High Alti-
tude Derate chart for details.
