Maytag FG7MQ Installation guide
- Category
- Heat pumps
- Type
- Installation guide
This manual is also suitable for
Modulating Condensing Gas Furnaces With Variable Speed Blowers - 97% + AFUE
*MQ Upflow / Horizontal Model
INSTALLATION INSTRUCTIONS
WARNING
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
2
NOTE TO INSTALLER: This installlation manual focuses on installing the MQ furnace in a single zone only. The
MQ furnace may also be installed with the iQ Zone zoning system. The installation of the furnace itself does not
change. Additional details, such as the duct/damper design, and the low voltage wiring may be found in the following
publications:
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION 3
4
Combustion Air Quality ............................................... 5
Heating Load ............................................................... 5
................. 6
............................................... 6
Clearances to Combustible Materials ......................... 6
7
.................................................. 8
......... 8
........................................................ 8
..... 8
............................. 8
......................... 9
....................... 9
Alternate Method of Providing Air from Outside: ..... 10
...... 10
.................................................... 10
................................................... 11
.................................. 11
............................................... 11
............. 12
.................. 13
......................................... 13
................................................ 13
.................................................. 13
CIRCULATING AIR REQUIREMENTS 14
................................................... 14
Return Air Connections ............................................... 14
................................. 14
................................................. 15
............................................... 15
Acoustical Treatments ................................................. 15
FURNACE INSTALLATION 15
................................................ 15
....................................................... 15
.................................................. 15
Bottom Panel Removal ............................................... 16
Alternate Bottom Panel Removal ............................. 16
.......................................... 17
......................................... 17
Accessories ................................................................. 17
........................................................... 17
................................................... 17
.................................................... 18
Typical Orientation ............................................. 18
Alternate Orientation .......................................... 18
.......................................... 18
.............................................. 19
20
Leak Check ................................................................. 20
High Altitude Application ............................................. 20
Conversion to LP/Propane .......................................... 22
ELECTRICAL WIRING 22
..................................................... 23
...................... 23
...................................................... 23
....................................................... 23
......................................... 23
.......................................... 23
................................................................... 23
25
.................................................... 25
.................................................. 25
.................................................... 25
........................... 25
..................... 26
.......................................... 26
...... 26
OPERATING SEQUENCE 26
Heating Cycle .............................................................. 26
Cooling Cycle .............................................................. 26
.................................................................... 27
................................................. 27
MAINTENANCE 27
TROUBLESHOOTING 28
29
....................... 29
................................................................. 29
............. 29
........................................................... 30
......................................... 30
.................................. 30
..................................................... 31
...... 31
...... 31
......... 31
.............................. 32
..................................................... 33
.................. 33
..................................... 34
............................... 35
.... 36
.................................................. 37
............................. 37
40
3
WARNING:
mechanical skills or tools, call your local dealer for
assistance.
thoroughly understand the instructions provided with
the unit: Rags, brooms, vacuum cleaners, or other
cleaning tools, spray or aerosol cans, soap powders,
plastic containers, paper bags or other paper products,
gasoline, kerosene, cigarette lighter fluid, dry cleaning
fluids, paint thinners, or other volatile fluids.
diagram before making any electrical connections to the
32) or the unit wiring label.
IMPORTANT SAFETY INFORMATION
designate a degree or level of seriousness and should
not be ignored.
WARNING
CAUTION
or property damage.
WARNING:
WARNING:
WARNING:
4
WARNING:
these instructions, all applicable local building codes
Refer to the furnace rating plate.
6).
page 7, page 8, page
9
, page 10.
12),
12)
, 12)12).
Connect this furnace to an approved vent system only,
as specified on page 10, page 11, page 12 page
13
.
a commercially available soap solution to check all
page 20.
Consult
29) and the rating plate for the
important that the duct system be designed to provide
improperly designed duct system can result in nuisance
shutdowns, and comfort or noise issues.
to areas outside the space containing the furnace, the
furnace casing and terminating in the conditioned space.
page 14.
page 6.
guidelines listed on
page 6.
compliance with regulation 248 CMR 4.00 and 5.00 for
installation of through – the – wall vented gas appliances
as follows:
the bottom of the vent terminal and the air intake is
installed below four feet above grade the following
be placed on each floor level where there are
recognized under 527 CMR.
compliance with the manufacturer’s instructions.
A copy of the installation instructions shall remain
of the installation.
directly above the location of vent terminal. The
bottom of the vent terminal and the air intake is installed
floor level where there are bedrooms. The detector
compliance with the manufacturer’s instructions.
A copy of the installation instructions shall remain
of the installation.
5
Commercial buildings
Buildings with indoor pools
Permanent wave solutions
Chlorine based swimming pool chemicals
Carbon Tetrachloride
Halogen type refrigerants
Printing inks, paint removers, varnishes, etc.
Hydrochloric Acid
Cements and glues
Antistatic fabric softeners
Masonry acid washing materials
Heating Load
This furnace should be sized to provide the design heating
using approved methods available from Air Conditioning
or other approved engineering methods.
The ductwork should
be appropriately sized to the capacity of the furnace to
ensure its proper airflow rating.
Zoned systems may increase undesirable effects of
the heating load for zoned installations.
a sea level input rating large enough that it will meet the
heating load after deration for altitude.
furnace can function like 11 different furnaces.
heat output needed and changes the step accordingly.
are 5 additional steps that use different on and off times.
thermostat can control the heat delivered to the residence
The information listed below is for reference purposes only
state codes. Always consult with local authorities before
installing any gas appliance.
Electrical Connections
General Installation
CAUTION:
must be free of chemicals that can form corrosive acidic
compounds in the combustion gases. The recommended
source of combustion air is to use outdoor air. However,
the use of indoor air in most applications is acceptable
the outdoors by way of attic, crawl space, air duct, or
page 8
6
CAUTION:
Operating gas furnaces in construction environments can
cause a variety of problems with the furnace. Proper use
construction is recommended. This gas furnace may be
used during construction if it is not in violation of any
applicable codes and the following criteria are met:
furnace must be permanently installed according to the
instructions supplied with the furnace including electrical
supply, gas supply, duct work and venting. The furnace
must be controlled by a thermostat properly installed
according to the instructions supplied with the furnace
and thermostat. The installation must include a properly
when necessary.
structure and located such that dust and gases
from construction activity are not introduced into the
combustion system.
does not freeze in the furnace or condensate drain lines
overnight if turned off.
replaced or cleaned, the duct work must be inspected
and cleaned of any construction debris, and the furnace
must be cleaned and/or repaired if found to be dirty,
approved by applicable local authority even if this
acceptable). This information will be used to track the
furnaces. Proof of this submittal shall be available for
temperatures in ranges normally found in occupied
residences, including setbacks. Minimum continuous
Installation in a Garage
WARNING:
FIRE OR EXPLOSION HAZARD
garage with the provision that the burners and igniter are
The furnace must be located or protected to prevent
physical damage by vehicles.
combustible material listed in
. To obtain model
furnace rating plate, located inside of the furnace cabinet.
Access for positioning and servicing the unit must be
considered when locating unit. The need to provide
INSTALLATION CLEARANCES
............ ............
.......... ...............
................... ..........
†
NOTE: Allow 24 inches minimum clearance for servicing. Recommended
clearance is 36 inches.
TOP
FRONT
UPFLOW
APPLICATIONS
HORIZONTAL
APPLICATIONS
VENT
SIDE
TOP
BOTTOM
VENT
FRONT
BACK
SIDE
LEFT SIDE
RIGHT SIDE
7
REQUIREMENTS
WARNING:
CARBON MONOXIDE POISONING HAZARD
while all other appliances connected to the
and windows and all doors between the space
in which the appliance(s) connected to the
corrected in accordance with the National Fuel
IMPORTANT INFORMATION:
with the National Fuel Gas Code (NFGC) and all
page 5
WARNING:
WARNING:
outdoors and vent combustion products back outside.
Another important consideration when selecting one or
can sometimes be contaminated with various household
8
chemicals . These chemicals can cause severe corrosion
has the additional advantage that it isolates the system
from the effects of negative pressure in the house.
CAUTION:
Air openings on top of the furnace, in closet doors or
burners. This safety device is a manually reset switch.
switch must be replaced, use only the correct sized part
Direct Vent Furnaces
from the outdoors and then vent the combustion products
back outside, isolating the entire system from the indoor
is sealed and clearances to combustibles are maintained
Spaces
cubic feet per 1,000 Btuh of the combined input rates of
all appliances drawing combustion air from that space.
which supply heated air to areas outside the space must
draw return air from outside the space and must have the
of their respective openings to the furnace space. Attics
or crawl spaces must connect freely with the outdoors if
they are the source of air for combustion and ventilation.
whether inside or outside air is used to support combustion,
the method by which the air is brought to the space, and
all cases, the minimum dimension of any combustion air
opening is 3 inches.
inch per 1,000 Btuh of total input of all appliances in the
not less than
and
EXAMPLE
a free area of at least 100 in
2
rate of all appliances is 120,000 Btuh, each opening
must have a free area of at least 120 in
2
.
TOTAL INPUT
RATING (BTUH)
MINIMUM FREE AREA
(EACH OPENING)
ROUND DUCT
DIAMETER
40,000 12 inches
60,000 12 inches
80,000 12 inches
100,000 12 inches
120,000 13 inches
140,000 14 inches
160,000 15 inches
Vent or
Chimney
Furnace
Water
Heater
12” Max.
12” Max.
See
Notes
See
Notes
NOTES:
Each opening must be
at least 100 sq. in. or
1 sq. in. per 1,000 Btuh
of total input rating,
whichever is greater.
Openings must start at
no more than 12 inches
from the top and bottom
of the enclosure.
Attic
outdoors, each opening shall have a minimum free area
9).
ducts, the openings and ducts must have a minimum free
9).
9
TOTAL INPUT
RATING (BTUH)
MINIMUM FREE AREA
(EACH OPENING)
ROUND DUCT
DIAMETER
40,000 4 inches
60,000 5 inches
80,000 5 inches
100,000 6 inches
120,000 6 inches
140,000 7 inches
160,000 8 inches
Air Duct must be
at least 1 sq. in.
per 4,000 Btuh of
total input rating.
Ducts must
extend above
attic insulation.
Air Duct must be
at least 1 sq. in.
per 4,000 Btuh of
total input rating.
Ventilation Louvers
at each end of attic
Attic
Insulation
12" Max
Furnace
Water
Heater
Vent or
Chimney
Through Vertical Ducts
Space or Vented Attic
Water
Heater
Vent or
Chimney
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Furnace
Ventilation Louvers For
Unheated Crawl Space
-
-
-
-
-
-
-
-
-
Inlet Air
Ventilation Louvers
(each end of attic)
NOTE: Air openings shall
each have a free area of
not less than one square
inch per 4,000 Btuh of the
total input rating of all
equipment in the enclosure.
-
-
-
-
-
-
-
-
-
Alternate
Air Inlet
Outlet
Air
ducts, the openings and ducts must have a minimum free
large as the free area of their respective openings to the
.
wall, the two openings must each have free area of at
.
Through Horizontal Ducts
TOTAL INPUT
RATING (BTUH)
MINIMUM FREE AREA
(EACH OPENING)
ROUND DUCT
DIAMETER
40,000 5 inches
60,000 6 inches
80,000 7 inches
100,000 8 inches
120,000 9 inches
140,000 10 inches
160,000 10 inches
Furnace
Water
Heater
Air Ducts must be
at least 1 sq. in.
per 2,000 Btuh of
total input rating.
Vent or
Chimney
Air Duct
Air Duct
TOTAL INPUT
RATING (BTUH)
MINIMUM FREE AREA
(EACH OPENING)
ROUND DUCT
DIAMETER
40,000 4 inches
60,000 5 inches
80,000 5 inches
100,000 6 inches
120,000 6 inches
140,000 7 inches
160,000 8 inches
NOTE: Each opening to outside
must be at least 1 sq. in. per
4,000 Btuh of total input rating.
12" Max.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Furnace
Water
Heater
Vent or
Chimney
12"
Max
See
Note
See
Note
10
EXAMPLE
A space with a water heater rated at 45,000 Btuh input
WARNING:
this section and provide air for combustion and ventilation
according to on page 7, page 8, page 9, page 10.
The length of vent and combustion air piping for either
type of installation are shown in in 10)
slightly acidic and can cause severe corrosion of ordinary
affected by restrictive vent and combustion air piping.
Alternate Method of Providing Air from
Outside:
combustion air. One opening must be within 12 inches of
the ceiling, and the other must be within 12 inches of the
floor. However, an alternative method recently adopted by
of the space. This method may be used if it is acceptable
to the local codes.
THE FOLLOWING CONDITIONS MUST BE MET:
structure and connect with the out of doors through
vertical or horizontal ducts or be ducted to a crawl or
attic space that connects with the out of doors.
2. The opening must have a minimum free area of 1 in2.
per 3,000 Btu per hour of the total input rating of all
3. The free area must not be less than the sum of all the
areas of the vent connectors in the enclosure.
Spaces
separated by doors with a volume greater than 50 cubic
feet per 1,000 Btuh of the combined input rates of all
appliances which draw combustion air from that space.
combustion and venting, even though the furnace is located
above.
Table 1
Vent Pipe Lengths
FURNACE
MODELS
(BTU)
FURNACE
INSTALLATION
WITH 1 LONG RADIUS ELBOW*
WITH 1 LONG RADIUS ELBOW ON EACH PIPE*
OUTLET
2” DIAMETER
OUTLET
3” DIAMETER
INLET/OUTLET
2” DIAMETER
INLET/OUTLET
3” DIAMETER
60,000
Upflow 50 80 50 80
Horizontal 40 80 40 80
80,000
Upflow 60 90 60 90
Horizontal 50 90 50 90
100,000
Upflow 50 90 50 90
Horizontal
40 90 40 90
120,000
Upflow
90 90
Horizontal 70 70
*NOTES:
11
The inducer assembly on this furnace can be rotated to
vent the flue products out of the left or right side of the
of the following materials in the list and must conform to
MATERIALS STANDARDS
..................................................
.................................................................
....................................................
.................................................................
.................................................
..............................
...................................
instructions supplied with the PolyPro vent kits
minimum number of elbows or turns.
close to the furnace outlet as practical.
Table 1
a furnace of known input rate, when installed with piping
of selected diameter and number of elbows. To use the
table, the furnace input rate, the centerline length and the
number of elbows on each pipe must be known.
This is conveniently handled using the idea of equivalent
length
worth 7 ft.
listed in Table 1. Measure the linear length of the vent run
CAUTION:
clearance between vent piping and combustible surfaces.
However, it is good practice to allow space for convenience
in installation and service.
the combustion air intake is not located near a source
of solvent fumes or other chemicals which can cause
of substances on
page 5).
and the outdoors. Horizontal piping from inducer to
page 17
for additional information.
same atmospheric pressure zone. This means both
,
12)
, 12)12).
does not bear on the furnace. Pipe supports must be
installed a minimum of every 5 feet along the vent run
may be at shorter intervals if necessary to ensure that
there are no sagging sections that can trap condensate.
36)
couplings along the vent pipe, on either side of the
code.
hose clamps can be used. These couplings can be
ordered through your local furnace distributor. To install
a coupling:
is attached to the furnace and secure it with one of the
hose clamps.
pipe from the vent.
ensuring that the connection is tight and leak free.
12
be installed as depicted in and in
accordance with these instructions:
termination to windows and building air intakes.
be located to ensure proper furnace operation and
conformance to applicable codes. A vent terminal
must be located at least 3 feet above any forced air
inlet located within 10 feet. This does not apply to the
33).
.
horizontally from any electric meter, gas meter, regulator
precedence over these instructions.
directed into window wells, stairwells, under decks
or into alcoves or similar recessed areas, and do not
terminate above any public walkways.
according to the pipe diameter size of the installation.
obtain clearances shown in , a riser may be used
as shown in
Note 2
Mechanical draft
vent terminal
Direct vent
terminal
50,000 Btuh
or less
Forced air inlet
Direct vent
terminal - more
than 50,000 Btuh
Mechanical
draft vent
terminal
Mechanical
draft vent
terminal
Less
than
10 ft.
3 ft.
NOTES:
1. All dimensions shown are
minimum requirements.
2. Exterior vent terminations must
be located at least 12” above the
maximum expected snow level.
Note 2
4 ft
4 ft
12 in.
12 in.
9 in.
Note 2
Vent Locations
12” min. to maximum
expected snow level
(both pipes)
90° Elbow
Exhaust vent
option B
Exhaust vent
option A
Mounting kit faceplate
secured to wall with screws
(both pipes)
Combustion
air inlet
Exhaust vent
option C
18” Min.
36” Max.
8” Min.
36” Max.
(all positions)
Support
NOTE: Vent Configuration to Provide
12" Minimum height above Snow Level.
1/2"
Armaflex
Insulation or
Equivalent
(if required)
12" Above
Maximum
Expected
Snow Level
19" Max.
(See Note)
Outside
Wall
Alternate Horizontal Vent Installation
Combustion Air
Exhaust Vent
12” Above Maximum
Expected Snow Level
(Both pipes)
Elbows on the combustion air
inlet must be positioned pointing
away from the exhaust vent.
8" Min.
36" Max.
Plumbing Vent Roof Boot
(Both Pipes)
13
each other are shown in . The roof penetration must
be properly flashed and waterproofed with a plumbing
is not in use provided that:
the chimney.
are
maintained.
through the chimney.
CAUTION:
Table 2
noted in 10)
in Table 1. The restriction should be counted as 3
length of the 2 inch pipe must not be longer than 18
inches.
combustion system, a protective screen may be installed
over the combustion air intake opening. The screens
hole size must be large enough to prevent air restriction.
not be sized properly to vent the remaining appliances
system can result in the formation of condensate, leakage,
be brought into compliance before installing the furnace.
NOTE:
The pipes involved in the recall are High Temperature
these pipes This
recall does not apply to other plastic vent pipes, such
Condensate Disposal
The method for disposing of condensate varies according
to local codes. Consult your local code or authority having
run to the drain. The drain lines must be routed downward
to ensure proper drainage from furnace.
furnace.
16).
Table 2
WINTER DESIGN
TEMPERATURE
MAXIMUM FLUE PIPE LENGTH (FEET)
WITHOUT INSULATION WITH INSULATION*
20 45 70
0 20 70
10 60
*NOTE:
Vent Protection
14
side) of the furnace or in parallel with the furnace.
furnace, a damper must be installed to prevent chilled
air from entering the furnace and condensing on the heat
it must be designed so that operation of the furnace is
prevented when the damper is in the cooling position
and operation of the cooling system is prevented when
the damper is in the heating position.
Return Air Connections
air to areas outside the space where the furnace is
installed, the return air must be delivered to the furnace
size and without interruption.
opening and return air duct. NOTE: The ductwork must
29)
for return air opening size.
side, right side, or bottom of the furnace. NOTE:
the left or right side of the furnace for return air, the
) must not be removed from the
bottom of the furnace.
WARNING:
Side Return Installations: To attach the return air duct
to the left or right side of the furnace, punch out the 4
29)
. Using sharp metal cutters, cut an opening
Position the return air duct over the opening and secure
to the side with sheet metal screws.
) must
page
16
for removal instructions. Position the furnace over
the return air duct and secure together with sheet metal
screws. Make sure the screws penetrate the duct and
furnace casing.
CIRCULATING AIR REQUIREMENTS
WARNING:
29)
are recommended. NOTE:
furnaces cannot be changed manually by resetting the
dipswitches on the motor control board.
removable access panel. The opening should be
accessible when the furnace is installed in service and
shall be of a size that smoke or reflected light may be
observed inside the casing to indicate the presence of
shall be attached in such a way as to prevent leaks.
must be designed so that the return air is not less than
and outdoor air is used, the ducts and damper system
must be designed so that the return air supply to the
indoor return air applications.
furnace blower to provide airflow over the indoor coil,
15
bend the flanges on the furnace upward 90° with wide
29) for furnace flange
locations. NOTE:
casing, bend the flanges on the coil casing upward 90°
before attaching the return air duct.
sure the screws penetrate the sheet metal casing and
flanges.
running full size and without interruption.
furnaces, bend the flanges on the furnace upward
29) for
furnace flange locations. NOTE:
includes AC coil casing, bend the flanges on the coil
casing upward 90° before attaching the supply air duct.
ensuring even alignment of furnace air opening and
supply air duct. NOTE: The ductwork must have an
for supply air opening size.
noise eminating from the furnace. These treatments can
space. However, they can increase the pressure drop in
the duct system. Care must be taken to maintain the proper
rise and flow rate. This may mean increasing the duct
size and/or reducing the blower speed. These treatments
must be constructed and installed in accordance with
performance, be sure to install all the needed gaskets and
grommets around penetrations into the furnace, such as
for electrical wiring.
FURNACE INSTALLATION
or horizontal right or left positions with either right, left,
or upflow return air.
10)
stairs, etc).
components are protected from water.
in the side of the furnace when rotating the inducer.
page 7, page 8, page
9
, page 10, page 11, page 12 page 13 for
Upflow Installation
WARNING:
installed as shown in 31)
is installed with side return air, the bottom panel must not
Bottom Panel
Removal
section.
Horizontal Installation
WARNING:
).
or utility room in either a right to left airflow or left to right
airflow as shown in
.
bottom panel from the furnace before attaching the duct
page 16).
),
inches past the top and front of the furnace.
16
NOTE:
) using slotted iron channel
rafters with lag bolts. The furnace can also be suspended
using steel straps around each end of the furnace. The
straps should be attached to the furnace with sheet metal
screws and to the rafters with bolts.
that cement board or sheet metal be placed between the
beyond the front of the door and top of the furnace.
The steps listed below describe how to remove the bottom
16).
blower deck.
of the furnace.
furnace.
Flue pipe vented
to outside
J-Trap
Height
3” Min.
Coil Plenum
Wood or
non-combustible
platform
Combustion Air
Condensate
Drain Lines
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Threaded
Rod
Alternate Bottom Panel Removal
instructions, the steps below are an alternate method for
.
6. Carefully spread the bottom corner of the furnace cabinet
the front of the furnace.
7. Reassemble the furnace in reverse order.
6
7
5
1
2
3
4
1
4
2
7
3
6
5
17
Table 3
1 - PIPE INSTALLATIONS
VENT UPFLOW HORIZONTAL RIGHT HORIZONTAL LEFT
Right Option 1 Option 6
Left Option 2 Option 5
2 - PIPE INSTALLATIONS
VENT UPFLOW HORIZONTAL RIGHT HORIZONTAL LEFT
Right Option 3 Option 8
Left Option 4 Option 7
assembly.
switch.
inducer assembly.
4. Remove 4 screws securing the inducer assembly to
5. Rotate the inducer assembly to its new position.
NOTE:
reinstalling the 4 screws.
7. Move the cabinet plug from side of furnace and reinstall
in hole on opposite side of cabinet.
8. Reconnect the electrical harness to the inducer
assembly.
Accessories
The components in 18) are
installation, some of these components are optional and
may not be used. Please refer to the descriptions and
air pipe through the top of the furnace. NOTE:
installation, it is important that the pipe and screw holes
.
1. Position flange gasket over hole in the furnace cabinet.
supplied sheet metal screws.
.
between the furnace cabinet and the gas pipe. The rubber
side of the cabinet and the drain tube is routed through
the blower deck. Remove the plastic plug from the hole
and install the grommet before routing the drain tube.
disposal and, in some cases, the need to seal the furnace
cabinet.
IMPORTANT NOTE
Before using Table 3
select the option that properly matches your installation
type from 34)35).
NOTE:
maintain an airtight flow path from the air inlet to the flue
be closed off with the plastic cap to maintain air tightness
horizontal furnaces are indicated in 29).
WARNING:
CAUTION:
It is good practice to label all wires prior to
18
IMPORTANT NOTE
18)
are used when the inducer is rotated to vent
out thru the left or right side of the furnace cabinet.
NOTE:
be installed from inside the cabinet with the threaded
drain line to the threaded end.
Typical Orientation
them together using appropriate primer and cement.
Refer to the typical orientation shown in .
together using appropriate primer and cement.
NOTE:
alignment with other vent pipes.
Alternate Orientation
bond them together using appropriate primer and
cement. Refer to the alternate orientation shown in
.
Permanently bond them together using appropriate
primer and cement.
together using appropriate primer and cement.
NOTE:
alignment with other vent pipes.
IMPORTANT NOTE
2” PVC Tee
1/2” Tubing Formed
into a Loop
(Field Supplied)
PVC
Trap
2” PVC Pipe from Inline
Drain Assembly
(Not Included)
INSTALLATION OF PVC COMPONENTS
(TYPICAL ORIENTATION)
INSTALLATION OF PVC COMPONENTS
(ALTERNATE ORIENTATION)
2” PVC Pipe from Inline
Drain Assembly
(Not Included)
2” PVC Tee
2” PVC Elbow
(Field Supplied)
PVC
Trap
1/2” x 3/4”
Hose Barb
1/2” x 3/4”
Hose Barb
1/2” Tubing Formed
into a Loop
(Field Supplied)
ø 2 1/4” Rubber
Grommet
ø 7/8” Rubber
Grommet
ø 3/4” Rubber
Grommet
Flange
Gasket
FRONT
FRONT lettering must be
located near front
of furnace
Inlet Air
Finish Flange
19
The placement of the condensate drain lines will depend
17). The
drain lines can be routed out the left or right side of the
furnace, but must maintain a downward slope to ensure
proper condensate drainage.
your setup in 34)35).
THREE GENERAL PRINCIPLES APPLY:
trapping the condensate lines, it is acceptable to
combine the drains.
venting system. NOTE:
furnace drain line must be installed above the pumps
water line.
GENERAL RULES:
Option 2Option 4).
be turned vertically with a tee. The drip leg formed
Option 1, Option 2,
Option 3Option 4).
Option 1, Option
3
, Option 5Option 7). More importantly, make sure
this drain does not sag or become twisted in the middle.
The drain tube supplied with the furnace may need to
be trimmed.
Pressure Switch Tubing
WARNING:
EXPLOSION HAZARD
The static tap on the inducer is located behind the
displays the proper routing of pressure switch
have two pairs of switches. One set is connected to the
static tap on the inducer assembly and the other to the
NOTE:
20
The furnace may be installed for either left or right side
clearance between the gas supply line and the entry
hole in the furnace casing to avoid unwanted noise and/
or damage to the furnace. A typical gas service hookup
is shown in .
WARNING:
FIRE OR EXPLOSION HAZARD
After the gas piping to the furnace is complete, all
connections must be tested for gas leaks. This includes
pipe connections at the main gas valve, emergency
The soap and water solution can be applied on each
must be retightened. Repeat the tightening and soap
check process until bubbling ceases.
IMPORTANT NOTE
High Altitude Application
The installation of this furnace at altitudes above 2,000
Please consult your local code authority.
thermostat will not use the higher of its
output. 21) lists the highest running step
and its associated manifold pressures for each altitude.
WARNING:
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
IMPORTANT NOTES:
21)
run to the unit as shown in
Figure 18
30) lists gas flow capacities for standard
pipe sizes as a function of length in typical applications
based on nominal pressure drop in the line.
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Maytag FG7MQ Installation guide
- Category
- Heat pumps
- Type
- Installation guide
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