7
Mortex Products, Inc. / FT. WORTH, TX 76106
G17 / G18 Installation Instructions
Printed 04/04
6
Mortex Products, Inc. / FT. WORTH, TX 76106
G17 / G18 Installation Instructions
Printed 04/04
INSTALLATION INSTRUCTIONS
AIR DISTRIBUTION SYSTEMS
The supply duct system must be designed so that static
pressure in the duct does not exceed the static pressure list-
ed on the furnace rating plate. Location, size and number of
registers should be selected on the basis of best air
distribution and floor plan of the home. A manual to
review before selecting a duct system is Manufactured
Housing Duct Systems: Guide to Best Practices by
Manufactured Housing Research Alliance (MHI-MHRA).
Typical duct systems are shown below: FIG. A, B, C
DUCT CONNECTOR / BASE INSTALLATION
The furnace may be on combustible flooring (expect
carpeting) when installed with 86AA001-
Duct Connector and 87FB0005 Floor Base.
1. Cut a 14-1/8 x 14-1/8 opening in floor. Fig. D.
FIG.D Duct Connector Opening, Fuel & A/C Lines
2. Orient duct connector to align 11x13 tabbed
opening with floor duct. See FIG. E
FIG. E- 86AA001- Duct Connector
1. Place duct connector tab end down, thru floor
opening to rest on top duct surface.
2. Use eight (8) oval holes on tab surfaces as locators and
mark for 11x13 duct opening; remove duct connector.
3. Connect marks with straight lines and cut out the duct
opening slightly outside the lines.
4. Attach four (4) foam tape gaskets (provided) to duct
connector alongside tabs for a 11x13 perimeter seal.
5. Replace duct connector/gaskets through floor opening.
6. Bend tabs down into the duct opening and fold back
180 degrees, securing duct connector. Add screws if
needed.
7. Slit the 4 corners of the connector extending above the
floor. Bend sides over onto the floor surface. Fig. F
8. Install floor base over floor opening with 13x13
flanges down. Nail to floor thru 4 holes. Fig. G
INSTALL FURNACE
Prior to installing furnace, fuel and A/C line openings 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 fasteners/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.
RJ - SERIES ROOF JACK
G17D and G18D 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.
WARNING:
Do not install furnace with any other
type of venting system.
A HAZARDOUS CONDITION
MAY RESULT.
FIG. H - RJ SERIES ROOF JACK
FIG. A - Single trunk duct with in-line registers
FIG. B - Double duct with in line registers and
crossover duct
FIG. C - Graduated Single Trunk with perimeter
registers
FLOOR BASE
DUCT
CONNECTER
FOLD-OVER
TABS
14-1/8" X 14-18"
FLOOR CUTOUT
11" X 12" DUCT
OPENING
MAIN TRUNK
FIG. F
FIG. G
THE SEALED COMBUSTION VENT SYSTEM CONSISTS OF:
FURNACE SERIES
FURNACE SERIES
ROOF JACK BODY AND ROOF JACK CROWN
G18D-A , 56" H
G17D-B, G18D-B, 72" H
PART NO.
FOR: FLAT OR
"A"
"B"
ROOF JACK BODY
SLOPE ROOF
ADJUSTABLE HEIGHT
ADJUSTABLE HEIGHT
90-RJF1729-AL
FLAT
73"- 85 "
89" - 101"
90-RJF2551-AL
FLAT
81"- 107"
97" - 123"
90-RJS1729-AL
3/12
73" - 85 "
89" - 101"
90-RJS2551-AL
3/12
81" - 107"
97" - 123"
90-RJS3868-AL
3/12
94" - 124"
110" - 140"
90-RJS6399-AL
3/12
119" - 155"
135" - 171"
PART NO.
MUST USE
ROOF JACK CROWN
WITH:
90-RJCRWN-AL
ROOF JACK BODY
