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# 47904K005

Page 3

INSTALLATION

These instructions must be placed on or near the
furnace in a conspicuous place.

The furnace design is certified by CSA International as a
Category IV furnace in compliance with the latest edition
of American National Standard Z21.47/CSA Standard 2.3
for Gas-Fired Central Furnaces, for operation with natural
gas or propane. Consult the rating plate on the furnace for
gas type before installing.

The maximum hourly heat loss of space shall be calcu-
lated in accordance with the procedure described in the
current manuals of Air Conditioning Contractors of
America, or by any other recognized method which is
suitable for local conditions, provided the results obtained
are in substantial agreement with, and not less than, those
obtained using the procedure described in the manuals.

G2D93CT and G2D95CT furnaces may be installed as

upflow

 or 

horizontal furnaces

. When installed horizontally,

the installer must install a sheet metal screw to retain the
upper door as shown in Figure 1.

G2D93CU and G2D95CU furnaces must be installed only
as upflow furnaces.

Never install any furnace on its back.

Inspection of Shipment

This furnace is shipped in one package, completely
assembled and wired.

 The thermostat is shipped in a

separate carton when ordered.

Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Damage claims should be filed
with the carrier immediately. Claims of shortages should
be filed with the seller within 5 days.

Location

To provide proper operation and satisfactory performance,
care must be taken in choosing the location for this furnace.
The atmosphere in which the furnace operates must be free
of contaminants such as chlorides and sulfates.

The furnace must be installed so that electrical compo-
nents are protected from water.

 Unit must be level for

proper condensate drainage.

All models are suitable for closet or utility room installation.

The furnace is suitable for installation in buildings
constructed on-site. The furnace should be centralized in
respect to the heat distribution system as much as
practicable. When installed in a utility room, the door
should be wide enough to allow the largest part of the
furnace to enter, or permit the replacement of another
appliance, such as a water heater.

A gas-fired furnace for installation in a residential garage must
be installed so the burner(s) and the ignition source are
located not less than 18" above the floor. The furnace is to be
located or protected to avoid physical damage by vehicles.

This furnace is not recommended to be used as a construc-
tion heater during any phase of construction. Very low return
air temperatures, harmful vapors, and operation of the unit
with clogged or misplaced filters will damage the unit.

The furnace may be used for heating of buildings or
structures under construction, if the following conditions
are met:

The vent system must be permanently installed per
these installation instructions.

A room thermostat must control the furnace. The use
of fixed jumpers that will provide continuous heating is
not allowed.

The return air duct must be provided and sealed to
the furnace.

Return air temperature range between 60°F and 80°F
must be maintained.

The condensate system must not be ex-
posed to temperatures under 32°F.

 The

condensate system must be insulated if ex-
posed to temperatures under 32°F. Use of heat
tape is permissible provided the rate tempera-
ture of the tape 

does not exceed 155°F.

 CAUTION

Horizontal Installations

Figure 1

Summary of Contents for G2D93CT

Page 1: ...vice or maintenance can cause injury or property damage Refer to this manual For assistance or additional information consult a qualified installer service agency or the gas supplier WARNING The insta...

Page 2: ...pply and Piping beginning on page 20 of these instructions 7 Always install furnace to operate within the furnace s intended temperature rise range with a duct system which has an external static pres...

Page 3: ...tmosphere in which the furnace operates must be free of contaminants such as chlorides and sulfates The furnace must be installed so that electrical compo nents are protected from water Unit must be l...

Page 4: ...ted space it must be kept free and clear of insulating materials To avoid property damage caused by condensate drain blockage install a field fabricated auxiliary drain pan with a separate drain line...

Page 5: ...to the PVC pipe Use high temperature RTV sealant to attach elbow to PVC pipe Confined Space A confined space is defined as a space whose volume is less than 50 cubic feet per 1000 BTU per hour of the...

Page 6: ...must be supported with mounting straps to prevent any weight load from being applied to the vent blower Horizontal vent pipe must be supported every 5 and vertical pipe should be supported every 10 t...

Page 7: ...e is 27 use the diameter values for the 30 row in the tables For direct vent installations if the vent and air intake pipe are not equal in length and number of elbows then determine the minimum pipe...

Page 8: ...e shall not terminate over public walkways or near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property damage or where conden...

Page 9: ...r a e l C D e h t e v o b a d e t a c o l t i f f o s d e t a l i t n e v o t e c n a r a e l c l a c i t r e V e h t m o r f m c 1 6 t e e f 2 f o e c n a t s i d l a t n o z i r o h a n i h t i w l...

Page 10: ...C D e h t e v o b a d e t a c o l t i f f o s d e t a l i t n e v o t e c n a r a e l c l a c i t r e V e h t m o r f m c 1 6 t e e f 2 f o e c n a t s i d l a t n o z i r o h a n i h t i w l a n i m...

Page 11: ...wall and terminate as shown in Figure 7 The vent pipe on horizontal runs must slope upward away from the furnace at a minimum pitch of 1 4 per foot of run to prevent accumulation of condensate Do not...

Page 12: ...air restrictor plate see Figure 2 on page 6 is supplied with this furnace and can be found in the plastic bag containing these Installation Instructions and the User s Information Manual This restrict...

Page 13: ...temperature RTV silicone sealant so intake pipe can be removed if service is required In horizontal venting applications the vent and air intake pipe must be installed on the same side of the house w...

Page 14: ...ation of the flue pipe and is designed to keep objects out of the flue pipe For horizontal venting refer to Figure 13 For vertical venting refer to Figure 14 The vent pipe on horizontal runs must slop...

Page 15: ...1 Seal any unused openings in the common venting system 2 Visually inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code ANSI Z223 1 NFPA 54 latest...

Page 16: ...the draining will occur Install the plastic pipe plug opposite of the drain Using 3 4 PVC pipe make a connection from the adapter just installed to extend just outside the unit Install a 3 4 PVC tee...

Page 17: ...g installed on flue pan to one side of the internal trap assembly as shown in Figure 23 2 Connect the 1 2 NPT plug supplied to the opposite side of the internal trap assembly from the plug installed i...

Page 18: ...hoses must be able to reach the barbed fittings on the trap assembly NOTE Vent tee to avoid vapor lock If connecting to waste drain pipe a second trap must be installed downstream Horizontal Installat...

Page 19: ...or ducts sealed to the furnace casing and terminated outside the space containing the furnace A return air duct system is recommended If the unit is installed in a confined space or closet a return co...

Page 20: ...as a guide mark and cut a full size opening in the side panel s 2 Using the filter rack as a template mark and drill four 7 64 diameter screw holes in the side panel s Table 3 Minimum Filter Requireme...

Page 21: ...gas leaks Use a leak detecting solution or other preferred means Some soaps used for leak detection are corrosive to certain metals Carefully rinse piping thoroughly after leak detection has been com...

Page 22: ...lows a single stage thermostat to be used with a two stage G2D93CT U or G2D95CT U furnace To activate this option move the jumper pin see Figure 33 to desired setting 5 minutes or 10 minutes The furna...

Page 23: ...r Operation G2D95CT U Models The comfort level of the living space can be enhanced when using this feature by allowing continuous circulation of air between calls for cooling or heating The circulatio...

Page 24: ...high humidity In this setup the variable speed motor will operate Figure 35 Wiring Connections for Twinning Two G2D93CT U Furnaces Two Stage Heating Single Stage Cooling at a 18 reduction in the norma...

Page 25: ...6 1 V 0 8 0 U T C 5 9 D 2 G 4 3 M R O N A 0 0 5 1 0 5 9 0 0 6 1 0 0 4 1 0 0 2 1 0 0 0 1 0 2 V 0 8 0 U T C 5 9 D 2 G 1 M R O N D C 0 0 5 1 0 5 9 0 0 0 2 0 0 8 1 0 0 6 1 0 0 4 1 0 2 V 0 0 1 U T C 5 9 D...

Page 26: ...urnace Lighting Instructions For Your Safety Read Before Operating Be sure the manual gas control has been in the OFF position for at least 5 minutes before starting the unit Do not attempt to manuall...

Page 27: ...at 1st stage heat for the duration of the selected time before automati cally switching to 2nd stage heat OPERATION Sequence of Operation G2D93CT U Models Heating When the control is in standby mode...

Page 28: ...on control shuts off the gas valve and runs the combustion blower for an additional 15 seconds The circulating air blower continues to run for 2 minutes at 82 of the selected heating speed low fire or...

Page 29: ...re 41 A call for 1st stage cooling from the thermostat closes the R to Y circuit on the control board The control waits for a 1 second delay before energizing the circulating blower The blower motor r...

Page 30: ...er Wire 1 4 quick connect termi nals on both ends to jumper the HEAT and COOL speed on the integrated ignition blower control board 4 The remaining speed taps must be connected to dummy terminals mark...

Page 31: ...2 0 9 4 0 0 0 1 9 9 4 9 0 0 0 0 4 1 8 8 0 7 1 0 5 3 6 1 1 2 0 9 4 0 0 0 1 2 3 3 9 0 0 0 5 4 5 6 8 0 7 1 0 5 3 7 7 0 2 0 9 4 0 0 0 1 9 4 2 9 0 0 0 0 5 9 4 8 1 6 1 9 2 3 9 3 0 2 1 6 4 1 4 9 0 0 9 8 0 0...

Page 32: ...the unit is operating at the desired speed and within the rise range as shown on the unit rating plate The correct replacement motor must be installed as soon as possible to ensure continued satisfac...

Page 33: ...line becomes blocked or plugged the furnace will not operate properly MAINTENANCE Burners Light the burners and allow to operate for a few minutes to establish normal burning conditions Observe the b...

Page 34: ...LED is provided on the control board to indicate high heat state see Table 6 CFM LED G2D95CT U Models Only On G2D95CT U models an amber LED is provided on the control board to display CFM To determine...

Page 35: ...oor interlock switch Combustion blower assembly Flame rollout protector switch Hot surface igniter Input choke Heat Exchanger Group Heat exchanger primary Heat exchanger secondary Condensate drain pan...

Page 36: ...LINE VOLTAGE FIELD LINE VOLTAGE FACTORY SW1 FAULT CODE HISTORY BUTTON SEE NOTE 1 AUTOMATIC HEAT STAGING JUMPER BLOWER OFF DELAY TIMING 180 120 90 60 C NOTES 3 PROPER POLARITY MUST BE OBSERVED FOR FIE...

Page 37: ...47904K005 Page 37 Figure 45 G2D93CT Wiring Schematic P N 45604 005...

Page 38: ...FIELD PRESSURE SWITCH LOW PRESSURE SWITCH DRAIN IF USED ROLLOUT SWITCH IF USED ROLLOUT SWITCH NONE 10 5 P5 AUX LIMIT SWITCH IF USED WHT BLK SW1 GREEN LED RED LED AMBER LED FAULT CODE HISTORY BUTTON S...

Page 39: ...47904K005 Page 39 Figure 47 G2D95CT Wiring Schematic P N 46131 004...

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