Heat Controller MGD90-E5B User manual

INSTALLATION
INSTRUCTIONS
Manufactured Home
Downow Gas Furnace:
MGD-B Series
Heat Controller, Inc. • 1900 Wellworth Ave. • Jackson, MI 49203 • [phone] • www.heatcontroller.com

1
!
WARNING
SEALED COMBUSTION
DOWNFLOW GAS FURNACE
MODELS: G18D SERIES, SIZES: 60, 70, 77, 90
FOR INSTALLATION IN: MANUFACTURED (MOBILE)
HOMES, RECREATIONAL VEHICLES, PARK MODELS,
MODULAR HOMES AND BUILDINGS.
GENERAL INFORMATION
These down flow sealed combustion furnaces install in
Manufactured Homes, Recreational Vehicles or Modular
Construction. The furnaces conform to Part 3280 (a)(2)
of HUD Manufactured Homes Construction and Safety
Standards. They must be installed only with listed RJ-Roof
Jack, Sealed Combustion venting system.
NOTE: These instructions are intended to assist qualified
individuals experienced in the installation of heating
equipment.
Some state and local codes require installation
personnel to be licensed. Read all instructions before
starting the installation.
SAVE THIS MANUAL
NOTICE – Furnace set-up and any adjustment needed is
responsibility of the installer/retailer/ contractor and is
not covered by the furnace manufacturers warranty.
CHECKLIST: FURNACE START-UP
1. Has furnace roof jack crown been correctly installed.
2. Has the furnace gas valve and burner orifice
been cleaned.
3. Is the gas line outlet pressure set for the fuel used.
4. If the home uses a crossover air connector duct, is it
installed per home builders installation instructions.
5. Has furnace been operated through complete
heating cycle.
RISK OF FIRE OR ELECTRICAL SHOCK
Only qualified service personnel shall be used to
install and provide maintenance of this furnace.
CONTENTS PAGE
General Information...........................................1
Specifications ...................................................2
Safety Conditions ..............................................3
Installation Standards.........................................3
High Altitude Installation ....................................3
Installation Clearances .......................................3
Return Air...................................................... 4-5
Alcove & Closet Installation ................................5
Air Distribution Systems......................................6
Duct Connector/Base.........................................6
Install Furnace...................................................7
Roof Jack Selection............................................7
Cut Opening & Install Roof Jack ..........................8
Installing In Snow Regions ..................................8
Roof Jack On High-Pitch roof...............................8
Connect Power Supply Wires..............................9
Wall Thermostat ................................................9
Connect Thermostat Wires..................................9
Gas Piping .................................................. 9-10
High Altitude Deration Chart.............................11
Final Procedure...............................................12
Furnace & Air Conditioner Installation................12
Blower Performance Chart................................13
Wiring Diagrams ....................................... 14-16
INSTALLATION INSTRUCTIONS
CAUTION: READ ALL SAFETY GUIDES
BEFORE INSTALLING THIS GUIDE
Gas-Fired
LISTED
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Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
SAVE THIS MANUAL
1

Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
2

Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
3
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
❑ ELECTRIC POWER - turn o all electrical power to
furnace before performing any maintenance or service
on unit. Failure to take this precaution may result in
personal injury due to electrical shock.
❑ SERVICE - a qualified service technician should
service this unit. Fuel burning appliances can generate
toxic flue products. Modification of the appliance can
cause carbon monoxide in deadly amounts. To prevent
a safety hazard, maintain this appliance in a safe
operating manner and do not modify.
❑ DO NOT modify vent or operate the unit with a
blocked vent or inlet air pipe.
❑ DO NOT re-drill a burner orifice. If the orifice size
must be changed, use only a new orifice.
❑ DO NOT use matches, lighters, candles, or other
sources of open flame to check for gas leaks.
❑ PROPER maintenance for this unit requires certain
mechanical skills and tools. If you are at all uncertain,
contacta qualied service technician.
❑
CONSULT with a service technician for any
problems or questions you may have pertaining to this
appliance.
❑ ALWAYS inspect the appliance before starting a
new heating season, paying special attention to vent
pipes and fuel lines.
NOTE: The words “Shall” or “Must” indicate a
requirement, which is essential to satisfactory and safe
furnace performance.
The words “Should” or “May” indicate a
recommendation which may be helpful or enhance
performance.
INSTALLATION STANDARDS
CODE COMPLIANCE
The installer shall become familiar with and follow all
local codes and regulations which govern the installation
of this furnace. Where applicable, local codes may take
precedence.
❑ Federal Manufactured Home Construction and Safety
Standards – HUD Title 24, Part 3280.
❑ National Fuel Gas Code – ANSI-Z223.1/NFPA-54
❑ Unit electrical wiring and grounding shall comply with
National Electrical Code – ANSI/NFPA-70
❑ “Manufactured Housing” – NFPA-501 and Fire Safety
Criteria for Mobile Home Installations – NFPA 501A
❑ “Recreational Vehicles” – ANSI – 119/NFPA – 501C
HIGH ALTITUDE INSTALLATION
For elevations above 2,000 feet derate furnace input
4% for each 1,000 feet of elevation above sea level.
Furnace deration is accomplished by reducing the
burner orifice size. See DERATING CHART for orifice
size and CONVERSION INSTRUCTIONS, Page 11.
INSTALLATION CLEARANCES
These furnaces are design certified for the following
minimum clearances from combustible materials in
alcove or close installations.
Top ………………………………. ................... 6 in.
Sides ……………………………... .................. 0 in.
Back ……………………………… .................. 0 in.
Alcove-front of furnace …………. ................ 18 in.
Closet-front of furnace …………… ................. 6 in.
Duct ………………………………. .................. 0 in.
Vent/Roof Jack …………………… ................. 0 in.
* If the return air opening is below the top of the
furnace, clearance to the side or rear shall be 6”.
** See Return Air for clearances less than 6”.
Locate furnace to ensure adequate room for service
access to all vent connections, controls and the heat
exchanger. A front clearance of 18” minimum (24”
recommended) shall be provided by a closet door or
spacing away from a facing wall or partition.
For installation on combustible flooring (except
carpeting) using manufacturers supplied floor base P/N
87FB0005 and duct Connector Series P/N 86AA001,
included in 90-DCU0-01/03 kits.
!
CAUTION
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Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
4
RETURN AIR
ALCOVE INSTRUCTION
The furnace may be installed free standing or in an
alcove with a free flow of air back to the furnace. A
minimum of 18” shall be provided at the front for return
air and service access.
CLOSET INSTALLATION – 6 in.
Note: If return air is through a side wall, there must be a
minimum of 6-in. clearance from side wall to furnace in
addition to 6-in. minimum clearance from inside of closet
door to front of furnace.
If a louvered door complying with the minimum air
requirements is used, the front clearance my be reduced
to 1”.
CLOSET INSTALLATIONS
Additional Requirements:
Concerning under floor or ceiling return air systems, the
following item (1 – 10) must be adhered to:
1. The return-air opening into the closet, regardless of
location, is to be sized not less than specified on the
appliance rating plate.
2. If the return-air opening is located in the floor of the
closet (versus the vertical front or side wall), the
opening is to be provided with means to prevent its
inadvertent closure by a flat object placed over the
opening.
3. The cross-sectional area of the return system (when
located in the floor or ceiling of the manufactured
home) leading into the closet is to be not less than
that of the opening specified on the appliances
rating plate.
4. The total free area of openings in the floor or ceiling
registers serving the return-air duct system is to be
not less than 150% of the size opening specified on
the appliance rating plate. At least one such register
is to be located where the likelihood of its being
covered by carpeting, boxes, and other objects is
minimized.
5. Materials located in the return duct system have a
flame spread classification of 200 or less.
6. Non-combustible pans having one-inch upturned
flanges are located beneath openings in the floor
return duct system.
7. Wiring materials located in the return duct system
conform to Article 300-22 (B&C) of the National
Electric Code, ANSI / NFPA-70.
8. Gas piping is not run in or through the return duct
system.
9. The negative pressure in the closet, as determined by
test with the air-circulating fan operating at high
heating speed and the closet door closed, is to be
not more negative than minus 0.05-inch water
column.
10. For floor return systems, the manufactured home
manufacturer or installer shall affix a prominent
warning where it is easily read when the closet door
is open.
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
HAZARD OF ASPHYXIATION
DO NOT COVER OR RESTRICT
FLOOR OPENING, or equivalent
!
WARNING
or other objects is
may be reduced
4

Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
5
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
RETURN AIR
5

Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
6
DUCT CONNECTOR / BASE INSTALLATION
AIR DISTRIBUTION SYSTEMS
in 90-DCU0-01/03 as a kit. , included
6

Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
!
WARNING
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
7
Rj — SERIES ROOF jACk
G18D’s are sealed combustion furnaces tested and
listed for use
ONLY with RJ — Series Roof Jack Venting
System. Furnace exhaust gases vent outdoors through the
inner pipe of the RJ — Series “pipe-within-a-pipe” vent
system. The space between the outer and inner pipes is
used to bring in outside combustion air for the burner.
INSTALL FURNACE
Prior to installing furnace, fuel and A/C line opening
may be cut in. See Fig. D
1. Remove upper and lower furnace doors.
2. Slide furnace onto floor base and push back until
cabinet is against rear flange of floor base.
3. Secure furnace to floor with fastners
such as screws at right and left front inside
corners of cabinet.
4. Attach pipe strap at top of furnace to alcove or
closet framing, or fasten through furnace front
edge cabinet sides to wood framing.
Do not install furnace with any other type of venting
system. A HAZARDOUS CONDITION MAY RESULT.
CUTTING ROOF jACk OPENING
A proper installation of the roof jack requires that
openings in roof and ceiling be on the same vertical
centerline as the furnace flue collar. See FIG. 1
Mark the center point on the ceiling and scribe a 4”
radius (8” diameter) around this mark. If furnace is
in place during this step, cover the furnace and flue
opening to prevent debris from entering flue.
INSTALLING ROOF jACk
The roof jack body should be secured to the furnace
before the roof flashing is secured to the roof.
1. Insert roof jack body into opening in the roof.
2. From above, canter the roof jack body aligning with
the furnace collar.
3. From inside the home, pull down 4-3/16” D flue
pipe seating the pipe fully and firmly over the
furnace flue collar.
4. Next pull down the 7” D combustion air pipe
seating it over the mating furnace collar. Rotate the
combustion air pipe lining up to the screw hole on
the 7” collar.
5. Check and make sure the combustion air pipe is
fully seated. Then drive a # 10 sheet metal screw,
attaching pipe firmly to furnace collar.
6. Install optional ceiling trim ring, 90-TRM-RNG.
7. On the roof, caulk liberally under the roof jack
flashing.
8. Drive nails or screws through the flashing onto the
roof surface about 1 – 11/2” apart. Caulk again to
ensure a leak tight joint.
9. Install roof jack crown and fasten to roof jack body
with three (3) screws (provided) using pre-punched
holes.
INSTALLATION IN SNOW REGIONS
When the combustion air inlet to the roof jack is blocked
with snow, the furnace will not operate properly due to
the depleted combustion air supply.
Therefore, if the furnace will be located in regions where
snow accumulation on the roof exceeds 7” or in H.U.D.
Snow Load Zones, a roof jack extension – Part5 No.
90-OUTXT16-AL is recommended.
ROOF jACk ON HI-PITCH ROOF
To install the RJS (3/12) Series Roof Jack on roofs which
have a slope between 4.5/12 – 6/12, install a Part No.
90-RJS56 Roof Saddle, FIG. J. The combined assembly
of the RJS Roof Jack and Roof Saddle will conform to the
higher roof pitch. If roof pitch is greater than 6/12, field
fabricate a suitable adapter, or consult with factory.
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Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
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Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
!
WARNING
!
WARNING
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
To avoid electric shock, personal injury, or
death, turn off the power at the disconnect
or the main service panel before making
any electrical connections.
NOTE: The use of 18-gauge wire is highly
recommended to carry the thermostat load. Use of
smaller conductors risks operational problems caused by
loose or broken conductors or wire that is too small to
carry the load. Any such problems are the responsibility
of the installer.
With conductors smaller than 18-gauge, observe the
following guidelines.
Maximum Thermostat wire
Length (furnace to thermostat) Thermostat wire gauge
0–45 feet 22
0–70 feet 20
9
WALL THERMOSTATE
The location of the wall thermostat is important, as it
must sense the desired temperature of the entire
conditioned space. Choose a location 4–5 feet above
the floor, preferably on an inside wall in an area with
good air circulation. Stay away from lamps and air
registers and do not install behind a door. Choose a
location where the temperature will be reasonably
representative of other living areas the thermostat is
controlling.
CONNECT THERMOSTAT WIRES
When installing a furnace with a cooling coil
compartment, use of a five-connector thermostat cable is
recommended. This will allow easy installation of an air
conditioning system at a later date.
1. Insert 24V wires through the small plastic bushing on
the left side of the furnace.
2. Connect low voltage wires to the color coded low
voltage pigtails at the of the control panel.
3. Connect low voltage wires to the wall thermostat.
GAS PIPING
Supply piping must be sized in accordance with
recommendations found in National Fuel Gas Code
ANSI Z223.1/NFPA-54. In addition materials used in
manufactured homes must comply with requirements
contained in HUD Title 24, Section 3280.705 as well as
A119.2 for recreational vehicles.
See Chart in this manual for minimum sizes for NAT and
LP pipe and tubing serving the furnace only.
NOTE: The gas inlet on the gas control valve is 1/2-
14NPT. The gas line may be installed through the bottom
casing or on left or right side of furnace.
Take care when connecting the gas line to the
furnace gas valve. Use suitable wrenches to
support the gas valve when tightening fittings to
prevent mis-alignment of the attached burner
orifice. Do not damage the gas valve as improper
heating, exsplosion, fire or asphyxiation may
result.
Do not use matches, lighters, candles or other open
flame to check for leaks. Use soap or water solution
or a leak detector.
Do not test the fuel system at more than 14” W.C.
pressure once furnace has been connected to the
gas line. Over pressure may void the warranty and
damage the valve which could cause an explosion,
fire or asphyxiation.
CONNECT POWER SUPPLY
1. Remove the furnace control panel cover.
2. Insert 115 V wiring through a strain relief bushing on
the left side of the furnace.
3. Connect the HOT wire to the black pigtail lead;
connect the NEUTRAL wire to the WHITE pigtail
lead. Secure the connections with suitable wire nuts
and wrap with electrical tape. Refer to Wiring
Diagram on pg. 12 for connections.
4. Connect the GROUND wire to a grounding screw in
the control panel.
5. Reinstall and secure the control panel cover with
screws.
Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
9

Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
MODEL TYPE LENGTH PIPE TUBING
OF SIZE SIZE
GAS (FT.) (IN.) (IN. OD)
to 20 1/2 5/8
Natural to 60 1/2 -
60 to 70 - 3/4
to 40 1/2 -
Propane to 70 - 5/8
to 80 1/2 -
to 20 - 5/8
to 50 1/2 -
Natural to 60 - 3/4
70 to 80 3/4 -
to 30 1/2 -
Propane to 60 - 5/8
to 80 1/2 -
to 20 - 5/8
to 50 1/2 -
Natural to 60 - 3/4
77 to 80 3/4 -
to 30 1/2 -
Propane to 60 - 5/8
to 80 1/2 -
to 40 1/2 3/4
Natural to 50 - 3/4
90 to 30 1/2 -
Propane to 40 - 5/8
to 60 1/2 3/4
!
WARNING
!
WARNING
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
GAS PIPE AND TUBING–MIN SIZES
GAS PRESSURE
TYPE GAS INLET GAS PRESSURE
PRESSURE TO BURNER
Natural 7” W.C. 3-1/2” W.C.
Propane 11” W.C. 10” W.C.
When converting gas control valve from or to
Propane gas, it will be necessary to change the
main burner orifice to prevent an underfired or
overfired condition . The pressure regulator on the
gas control valve must also be converted. See label
on lower furnace compartment for full instructions.
If the gas input to the furnace ie too high due to
excessive pressure, wrong size burner orifice, no
orifice, high altitude, etc., the burner flame will be
sooty especially with Propane gas. This type of
furnace operation can produce carbon monoxide,
which could result in unsafe operation, explosion,
and/or fire and asphyxiation.
Should overhead heating occur, or the gas supply
fail to shut off, shut off the manual gas valve to the
furnace and allow burner to run until furnace cools
down and blower shuts off before shutting off
electrical supply.
Operation — Once system gas piping has been checked
for leaks, operation the furnace using the lighting
instructions on the front furnace panel, and:
1. Observe burner through viewport and make sure it
ignites. The color of the flame when operating on
natural gas will burn blue with yellow tips. On
Propane, a significantly yellow flame can be
expected. If flame is not the proper color call a
qualified service technician for service.
2. Let furnace operate until blower cycles on. This takes
about 2 to 2 1/2 minutes.
3. Turn thermostat down.
4. Observe burner to make sure it has shut off.
5. Let furnace cool and blower cycle off.
10
10

Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
11
NATURAL GAS
ELEVATION 60,000 BTU FURNACE 70,000 BTU FURNACE 77,000 BTU FURNACE 90,000 BTU FURNACE
PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE
SEA LEVEL 75AG-144 0.144 27 75AG-157 0.157 22 75AG-166 0.166 19 75AG-173 0.173 17
2000 75AG-1405 0.1405 28 75AG-154 0.154 23 75AG-161 0.161 20 75AG-1695 0.1695 18
3000 75AG-1405 0.1405 28 75AG-152 0.152 24 75AG-161 0.161 20 75AG-166 0.166 19
4000 75AG-136 0.136 29 75AG-1495 0.1495 25 75AG-159 0.159 21 75AG-166 0.166 19
5000 75AG-136 0.136 29 75AG-147 0.147 26 75AG-157 0.157 22 75AG-161 0.161 20
6000 75AG-136 0.136 29 75AG-144 0.144 27 75AG-154 0.154 23 75AG-159 0.159 21
7000 75AG-1285 0.1285 30 75AG-144 0.144 27 75AG-1495 0.1495 25 75AG-157 0.157 22
8000 75AG-1285 0.1285 30 75AG-1405 0.1405 28 75AG-147 0.147 26 75AG-154 0.154 23
9000 75AG-1285 0.1285 30 75AG-136 0.136 29 75AG-144 0.144 27 75AG-152 0.152 24
10000 75AG-120 0.120 31 75AG-136 0.136 29 75AG-1405 0.1405 28 75AG-147 0.147 26
PROPANE (LP) GAS
ELEVATION 60,000 BTU FURNACE 70,000 BTU FURNACE 77,000 BTU FURNACE 90,000 BTU FURNACE
PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE PART NO ORIF DIA DRILL SIZE
SEA LEVEL 75AG-086 0.086 44 75AG-0935 0.0935 42 75AG-096 0.096 41 75AG-104 0.104 37
2000 75AG-082 0.082 45 75AG-0935 0.0935 42 75AG-0935 0.0935 42 75AG-1015 0.1015 38
3000 75AG-082 0.082 45 75AG-089 0.089 43 75AG-0935 0.0935 42 75AG-0995 0.0995 39
4000 75AG-082 0.082 45 75AG-089 0.089 43 75AG-0935 0.0935 42 75AG-0995 0.0995 39
5000 75AG-081 0.081 46 75AG-089 0.089 43 75AG-089 0.089 43 75AG-098 0.098 40
6000 75AG-0785 0.0785 47 75AG-086 0.086 44 75AG-089 0.089 43 75AG-096 0.096 41
7000 75AG-0785 0.0785 47 75AG-086 0.086 44 75AG-086 0.086 44 75AG-0935 0.0935 42
8000 75AG-076 0.076 48 75AG-082 0.082 45 75AG-086 0.086 44 75AG-0935 0.0935 42
9000 75AG-076 0.076 48 75AG-081 0.081 46 75AG-082 0.082 45 75AG-089 0.089 43
10000 75AG-073 0.073 49 75AG-0785 0.0785 47 75AG-081 0.081 46 75AG-089 0.089 43
Table shows 4% Input Reduction per 1,000 feet elevation
Reference: NFPA No. 54, ANSI Z 223.1 National Fuel Gas Code
For Canadian High Alitude (2,000-4,500 feet), reduce gas pressure to burner manifold (manifold Ps.) to 3.0” W.C. and 9.0 W.C. for LP (Propane) Gas
KIT PART NUMBER ALTITUDE FURNACE INPUT
G18HA0601 0 - 5000 FT 60,000
G18HA0602 6,000 - 10,000 FT 60,000
G18HA0701 0 - 5000 FT 70,000
G18HA0702 6,000 - 10,000 FT 70,000
G18HA0771 0 - 5000 FT 77,000
G18HA0772 6,000 - 10,000 FT 77,000
G18HA0901 0 - 5000 FT 90,000
G18HA0902 6,000 - 10,000 FT 90,000
HIGH ALTITUDE ORIFICE CONVERSION kITS
GAS VALVE CONVERSION INSTRUCTIONS
HIGH ALTITUDE DERATE CHART – MAIN BURNER ORIFICE SIZE
Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
11

Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
12
IF FURNACE FAILS TO OPERATE PROPERLY:
1. Check setting on wall thermostat and the position of
the HEAT-COOL switch if air conditioning is installed.
2. Check to make sure that electrical power is on at the
furnace and the furnace breaker has not tripped.
3. Make sure that the filters are clean and return grills
are not obstructed. The supply registers should be
open.
4. Be sure that the furnace flue and inlet piping has not
been obstructed and is open. If the cause for failure
is not obvious, do not attempt to service the furnace
yourself. Call a qualified service agency or the gas
supplier.
FINAL PROCEDURE AIR CONDITIONING SYSTEMS
12

Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
13

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HEAT ONLY MODELS
A/C READY MODELS
WIRING DIAGRAM, G18D
G18D Series Gas Furnace TECHNICAL GUIDE
Mortex Products Inc. / Fort Worth, TX 76106 G18D Technical Guide
6
WIRING DIAGRAM, MGD-B
Heat Controller, Inc. MGD-B SERIES GAS FURNACE Installation Instructions
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WIRING DIAGRAM, MGD-B
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G18D Series Gas Furnace TECHNICAL GUIDE
Mortex Products Inc. / Fort Worth, TX 76106 G18D Technical Guide
7
Installation Instructions MGD-B SERIES GAS FURNACE Heat Controller, Inc.
15

04/2009
7/2009