
4
PRODUCT DESIGN Ventpipemustbeeither2”or3” in diameter, depending
uponfurnaceinput,numberofelbows,lengthofrunand
installation (1 or 2 pipes). The optional Combustion Air
Pipeis dependentoninstallation/coderequirements and
must be 2” or 3” diameter PVC.
2. Linevoltagewiring can enterthroughtherightor left side
ofthefurnace.Lowvoltagewiring can enter through the
rightor left side offurnace.
3. Conversionkitsfor propanegasandhighaltitude natural
andpropanegasoperationare available. See High Alti-
tudeDerate chart for details.
4. Installer must supply the following gas line fittings, de-
pendingon which entrance isused:
Left -- Two 90° Elbows, one close nipple, straight pipe
Right --Straightpipe to reach gasvalve.
Accessibility Clearances (Minimum)
POSITION* FRONT SIDES REAR TOP FLUE FLOOR
Upflow30010 C
Horizontal Alcove 6 0 4 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.
POSITION* FRONT SIDES REAR TOP FLUE FLOOR
Upflow10010NC
Horizontal Alcove 6 0 4 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.
*MVC95* 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.
*CVC9 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.
AlcoveIllustration
REAR
SIDE
SIDE
LCOVE
24"at frontisrequiredfor servicingorcleaning.
Note: In all cases accessibility clearance shall take
precedence over clearances from the enclosure where
accessibility clearances are greater. All dimensions are
givenininches.
GeneralOperation
Modelscoveredbythis manualcomewithanew4-wirecom-
municatingPCB. Whenpairedwith a compatible communi-
catingindoor unit and aCTK01AA communicating thermo-
stat, these models can support 4-wire communication pro-
tocoland provide more troubleshooting information.These
modelsare also backward compatiblewith the legacy ther-
mostatwiring.
TheGCVC9,GMVC95,AMVC95andACVC9 furnaces are
equippedwithanelectronic ignition device to light the burn-
ersandaninduceddraftblowertoexhaustcombustionprod-
ucts.
Aninterlockswitchprevents furnace operation if theblower
dooris not in place. Keepthe blower access doors in place
exceptforinspection and maintenance.
Thesefurnacesarealsoequippedwithaself-diagnosingelec-
tronic control module. In the event a furnace component is
notoperating properly, the control module's dual 7-segment
LED'swill display an alpha-numericcode, depending upon
the problem encountered. These LED's may be viewed
throughtheobservation window in thebloweraccess door.
Referto the TroubleshootingChartfor further explanation of
the LED codes and Abnormal Operation - Integrated Igni-
tion Control sectionin the Service Instructionsfor an expla-
nationofthe possible problem.
Theratedheatingcapacityof the furnace should be greater
thanor equal to thetotal heat lossof the area tobe heated.
The total heat loss should be calculated by an approved
methodorinaccordance with “ASHRAE Guide” or “Manual
J-LoadCalculations” published by theAirConditioningCon-
tractors of America.
*Obtain from: American National Standards Institute 1430
BroadwayNewYork,NY10018
LocationConsiderations
• The furnace should be as centralized as is practical
with respect to the air distribution system.
• Donotinstallthefurnacedirectly on carpeting, tile, or
combustiblematerialotherthanwood flooring.
• When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 1/8” angle as
shownin theInstallationandService Instructions.The
length of the rod will depend on the application and
clearancenecessary.
• When installed in a residential garage, the furnace
mustbe positioned so the burnersandignitionsource
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve-
hicles.
Notes:
1. Installermustsupply oneortwoPVC pipes:oneforcom-
bustionair(optional)andonefortheflue outlet(required).