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26

XIII. CIR

XIII. CIR

XIII. CIR

XIII. CIR

XIII. CIRCUL

CUL

CUL

CUL

CULA

A

A

A

ATIN

TIN

TIN

TIN

TING AIR & FIL

G AIR & FIL

G AIR & FIL

G AIR & FIL

G AIR & FILTER

TER

TER

TER

TERS

S

S

S

S

D

UCTWORK

 - A

IR

 F

LOW

Duct systems and register sizes must be properly designed for the
CFM and external static pressure rating of the furnace. Design the
ductwork in accordance with the recommended methods of  “Air
Conditioning Contractors of America” Manual D.

Install the duct system in accordance with Standards of the Na-
tional Board of Fire Underwriters for the Installation of Air Condi-
tioning, Warm Air Heating and Ventilating Systems. Pamphlets No.
90A and 90B.

A closed return duct system must be used, with the return duct
connected to the furnace. 

NOTE:

  Ductwork must never be attached

to the back of the furnace.

 

 Flexible joints may be used for supply

and return connections to reduce noise transmission. To prevent
the blower from interfering with combustion air or draft when a
central return is used, a connecting duct must be installed be-
tween the unit and the utility room wall.  Never use a room, closet,
or alcove as a return air chamber.

B

OTTOM

 R

ETURN

 A

IR

 O

PENING

 [U

PFLOW

 M

ODELS

]

The bottom return air opening on upflow models utilizes a “lance
and cut” method to remove sheet metal from the duct opening in
the base pan. To remove, simply press out the lanced sections by
hand to expose the metal strips retaining the sheet metal over the
duct opening.  Using tin snips, cut the metal strips and remove the
sheet metal covering the duct opening.  In the corners of the open-
ing, cut the sheet metal along the scribe lines to free the duct
flanges.  Using the scribe line along the duct flange as a guide,
unfold the duct flanges around the perimeter of the opening using
a pair of seamer pliers or seamer tongs.  

NOTE:

 Airflow area will be

reduced by approximately 18% if duct flanges are not unfolded.
This could cause performance issues and noise issues.

WARNING

E

DGES OF SHEET METAL MAY BE SHARP. 

U

SE GLOVES AS A PRECAUTION

WHEN REMOVING SHEET METAL FROM THE DUCT OPENING.

CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL

 

CUT USING TIN SNIPS

PRESS OUT BY HAND

SCRIBE LINES OUTLINING
DUCT FLANGES

Duct Flange Cut Outs

When the furnace is used in connection with a cooling unit, the
furnace should be installed in parallel with or on the upstream side
of the cooling unit to avoid condensation in the heating element.
With a parallel flow arrangement, the dampers or other means
used to control the flow of air must be adequate to prevent chilled
air from entering the furnace and, if manually operated, must be
equipped with means to prevent operation of either unit unless the
damper is in the full heat or cool position.

When the furnace is installed without a cooling coil, it is recom-
mended that a removable access panel be provided in the outlet

air duct.  This opening shall be accessible when the furnace is
installed and shall be of such a size that the heat exchanger can be
viewed for visual light inspection or such that a sampling probe
can be inserted into the airstream.  The access panel must be
made to prevent air leaks when the furnace is in operation.

When the furnace is heating, the temperature of the return air en-
tering the furnace must be between 55°F and 100°F.

F

ILTERS

 - R

EAD

 T

HIS

 S

ECTION

 B

EFORE

 I

NSTALLING

 T

HE

R

ETURN

 A

IR

 D

UCTWORK

Filters must be used with this furnace. Discuss filter maintenance
with the building owner.  Filters do not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without fil-
ters, the warranty will be voided.

On upflow units, guide dimples locate the side  return cutout
locations.  Use a straight edge to scribe lines connecting the
dimples.  Cut out the opening on these lines.  

NOTE:

 An

undersized opening will cause reduced airflow.

Refer to Minimum Filter Area tables to determine filter area require-
ments.

600

800

1000

1200

1400

1600

2000

0453BXA

194*

194*

240

288

---

---

---

0703BXA

---

324*

324*

324*

336

---

---

0704CXA

---

---

291*

291*

336

384

---

0904CXA

---

---

432*

432*

432*

432*

---

0905DXA

---

---

---

388*

388*

388*

480

1155DXA

---

---

---

486*

486*

486*

486*

Input

_

_

A

ir

fl

ow

COOLING AIRFLOW REQUIREMENT (CFM)

*Minimum filter area dictated by heating airflow requirement

.

Permanent Minimum Filter Area (sq. in)

[Based on a 600 ft/min filter face velocity]

600

800

1000

1200

1400

1600

2000

0453BXA

388*

388*

480

576

---

---

---

0703BXA

---

647*

647*

647*

672

---

---

0704CXA

---

---

583*

583*

672

768

---

0904CXA

---

---

863*

863*

863*

863*

---

0905DXA

---

---

---

777*

777*

777*

960

1155DXA

---

---

---

971*

971*

971*

971*

Input

_

_

A

ir

fl

ow

COOLING AIRFLOW  REQUIREM ENT (CFM)

*Minimum filter area dictated by heating airflow requirement.

Disposable Minimum Filter area (sq. in)

[Based on 300 ft/min filter face velocity]

U

PRIGHT

 I

NSTALLATIONS

Depending on the installation and/or customer preference, differ-
ing filter arrangements can be applied.  Filters can be installed in
the central return register or a side panel external filter rack kit
(upflows).  As an alternative a media air filter or electronic air cleaner
can be used as the requested filter.

The following figure shows possible filter locations.

Summary of Contents for GMS95

Page 1: ...f in a position which is more hazardous than when the unit is in operation Remember it is your responsibility to install the product safely and to know it well enough to be able to instruct a customer...

Page 2: ...ROPER VENT FLUE AND COMBUSTION AIR PIPING PRACTICES 13 TERMINATION LOCATIONS 13 CANADIAN VENTING REQUIREMENTS 14 STANDARD FURNACE CONNECTIONS 14 ALTERNATE FURNACE CONNECTIONS 14 NON DIRECT VENT SINGLE...

Page 3: ...afety Circuit Description 31 GENERAL 31 INTEGRATED CONTROL MODULE 31 PRIMARY LIMIT 31 AUXILIARY LIMIT 31 ROLLOUT LIMIT 31 PRESSURE SWITCHES 31 FLAME SENSOR 31 XVIII Troubleshooting 31 ELECTROSTATIC DI...

Page 4: ...warranty certificate is also supplied with the unit Read the warranty carefully and note what is covered Keep the warranty cer tificate in a safe location for future reference If additional informatio...

Page 5: ...lectrical Connection Inlets Alternate 19 Coil Front Cover Pressure Tap 20 Coil Front Cover Drain Port 21 Drain Line Penetrations 22 Drain Trap 23 Blower Door Interlock Switch 24 Capacitor 25 Integrate...

Page 6: ...are set per the furnace rating plate The input rate and temperature rise are set per the furnace rating plate 100 outside air is provided for combustion air requirements during construction Temporary...

Page 7: ...ly air opening and the combustible floor Exposure to contaminated combustion air will result in safety and performance related problems Do not install the furnace where the combustion air is exposed t...

Page 8: ...g system properly vents when tested as outlined above re turn doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous conditions of use halogen type refriger...

Page 9: ...input rating of all appliances installed in that space Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors are considered a par...

Page 10: ...nsion of rectangular air ducts shall not be less than 3 inches ing shall have a minimum free area of 1 square inch per 1 000 BTU per hour of the total input rating of all gas utilization equipment in...

Page 11: ...tallation Positions figure for appropriate in stallation positions ductwork connections and resulting airflow arrangements VII HO VII HO VII HO VII HO VII HORIZO RIZO RIZO RIZO RIZONT NT NT NT NTAL AP...

Page 12: ...ane gas installations require an orifice change to compensate for the energy content difference between natural and propane gas High altitude installations may require both a pressure switch and an or...

Page 13: ...nt flue pipe and a combustion air intake pipe Refer to the appropriate section for details concerning piping size length number of elbows furnace connections and terminations MATERIALS AND JOINING MET...

Page 14: ...DIRECT VENT INSTALLATIONS On upflow units secure the combustion air intake pipe directly to the air intake coupling On counterflow units secure the combus tion air intake pipe to the air intake coupl...

Page 15: ...ue piping to the rubber elbow using a worm gear hose clamp NOTE Use of the alternate vent flue location for upright installations requires the drain trap be installed on the same side of the unit as t...

Page 16: ...ould be in stalled on either side of the wall and solvent cemented to a length of pipe connecting the two couplings The length of pipe should be the wall thickness plus the depth of the socket fitting...

Page 17: ...s in each Vent Flue Combustion Air Intake pipe Elbows and or tees used in the terminations must be included when determining the number of elbows in the piping systems If the combustion air intake pip...

Page 18: ...es If the pipes must go below the joist and then up into the last joist space to penetrate the header two 45 elbows should be used to reach the header rather than two 90 elbows VENT INTAKE TERMINATION...

Page 19: ...t installations using the standard vent flue outlet require drain hoses to be connected as follows The following quantity of hoses tubes and hose clamps are provided with the unit HOSE A QTY 1 HOSE B...

Page 20: ...flow models relocation of the front cover pressure switch hose is required Make connections as follows 1 Remove the rubber plug from the coil front cover drain port Counterflow furnaces Relocate the f...

Page 21: ...is an integral part of this furnace Field alter ation to comply with electrical codes should not be required Wires are color coded for identification purposes Refer to the wiring diagram for wire rout...

Page 22: ...at 120 VAC Turn OFF power to the furnace before installing any accessories Follow the humidifier or air cleaner manufacturers instructions for locating mounting grounding and controlling these access...

Page 23: ...field convertible for use with propane gas by replacing the regulator spring with a propane gas spring from an appropriate manufacturer s propane gas conversion kit Taps for measuring the gas supply p...

Page 24: ...rotect against external corrosion when in contact with masonry plaster or insulation or subjected to repeated wetting by liquids such as water except rain water detergents or sewage MANUAL SHUT OFF VA...

Page 25: ...nace manifold with all gas appliances in operation Maintaining proper gas pressure depends on three main factors 1 Vaporization rate depending on temperature of the liquid and wetted surface area of t...

Page 26: ...the dampers or other means used to control the flow of air must be adequate to prevent chilled air from entering the furnace and if manually operated must be equipped with means to prevent operation...

Page 27: ...nace is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 5 Move the furnace gas valve manual control to the OFF position 6 Wait five minute...

Page 28: ...soap suds check for leaks at hose connection Bubbles forming indicate a leak SHUTOFF GASAND FIXALLLEAKS IMMEDIATELY BEFORE PROCEEDING TO NEXT STEP 6 Measure furnace gas supply pressure Supply pressure...

Page 29: ...uals the installation s gas heating value multiplied with a conversion factor hours to seconds divided by the number of seconds per cubic foot The measured input must not be greater than the input ind...

Page 30: ...sensed Circulator blower is energized on heat speed following a fixed thirty second blower on delay Electronic air cleaner terminals are energized with circulator blower Furnace runs integrated contro...

Page 31: ...DISCHARGE ESD PRECAUTIONS NOTE Discharge body s static electricity before touching unit An electrostatic discharge can adversely affect electrical components Use the following precautions during furna...

Page 32: ...e filter s by reversing the procedure for removal 4 Turn ON electrical power to furnace MEDIA AIR FILTER OR ELECTRONIC AIR CLEANER REMOVAL Follow the manufacturer s directions for service BURNERS Visu...

Page 33: ...he blower until filter clears bottom rail 5 Lower filter down and pull outward Front of Furnace Blower Front of Furnace Blower 6 Replace filter by reversing procedure X X X X XXI BEFO XI BEFO XI BEFO...

Page 34: ...34...

Page 35: ...kage proper length elbows and termination Check drain system Correct as necessary Correct pressure switch setpoint or contact motion Tighten or correct wiring connection Pressure switch hose blocked p...

Page 36: ...e sensor with emery clot See Vent Flue Pipe section for piping details See rating plate for proper gas pressure 7 7 FLASHES Flame sensor is coated oxidized Flame sensor incorrectly positioned in burne...

Page 37: ...OSTAT CONNECTIONS BU GN GND 115 VAC 24 VAC BLOWER COMPARTMENT DOOR SWITCH OPEN WHEN DOOR OPEN DOOR SWITCH WARNING DISCONNECT POWERBEFORE SERVICING WIRING TOUNITMUST BE PROPERLYPOLARIZED AND GROUNDED B...

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