Coleman DGAA Installation Manual page 14

129098-UIM-H-1011
It is recommended that the appliance is installed in a location where the
space temperature is 32 °F (0°C) or higher. If the appliance is installed
in a location where the ambient temperature is below 32 °F (0°C), the
combustion by-products could condense causing damage to the appli-
ance heat exchanger and!or the Roof Jack.
[IMPORTANT
The "VENT SYSTEM" must be installed as specified in these
instructions for Manufactured (Mobile) Home and Modular Homes.
This appliance must be vented with an approved roof jack may not
be common vented with another gas appliance.
Modular Homes must be vented with an approved roof jack and may
not be common vented with other appliances.
kWARNING
Failure to follow all venting instructions can result in fire, asphyxi-
ation, or explosion.
CAUTION]
Only use the appropriate roof jack. See Figures 21 and 22 for
correct application.
Do not exceed the maximum height as determined from Figures
21 and 22. Installer should allow an additional 1-1/2" travel
before the flue pipe assembly is fully extended against the built-in
stop. This provides an additional safeguard against the flue
assembly being pulled from the roof jack during transportation or
other stress conditions.
EXISTING FURNACE REPLACEMENT
If this furnace replaces an existing furnace, do the following:
1. If a 2rid roof, roof cap or addition has been made to the existing
roof of the home, remove the old roof jack completely! To avoid the
possibility of an improperly installed pipe or gaps in the old roof
jack, INSTALL A NEW ROOF JACK. Your ceiling and roof height
will determine the correct roof jack to use. Refer to the vent selec-
tion table, of the furnace installation instructions.
2. After unpacking the roof jack, check the rain caps. Insure they are
not damaged, tilted or crooked. Do not twist, crush or sit on the
roof caps during installation. Damaged roof caps will cause
improper furnace operation. The furnace will not heat properly and
could result in explosion.
3. Before inserting the roof jack into the furnace top, inspect the fur-
nace flue and combustion air opening for debris or insulation
which might have fallen in during pre-installation steps. Do not pro-
ceed unless all debris has been cleaned out or removed.
4. After installing roof jack on furnace top collar, check to make sure
there is no gap in back or side between the pipe collar and the fur-
nace casing top.
5. Use only the pipes provided with the roof jack assembly. Do not
add to or adapt other sheet metal pipes. Do not cut, insert or add
other pipes to this assembly.
6. In no case should there be a gap between sections of the flue pipe
or the combustion air pipe.
NEW HOME INSTALLATION
If this furnace is installed in a new home do the following:
1. Inspect the furnace top collars for signs of insulation or ceiling
debris which might have fallen in during cutting of the ceiling and
roof holes. Remove all debris before continuing.
2. After unpacking the roof jack, check the rain caps. Insure they are
not damaged, tilted or crooked. Do not twist, crush or sit on the
roof caps during installation. Damaged roof caps will cause
improper furnace operation. The furnace will not heat properly and
could result in explosion.
3. Before inserting the vent pipe into the furnace top, inspect the fur-
nace flue and combustion air opening for debris or insulation
which have fallen in during pre-installation steps. Do not proceed
unless all debris have been cleaned out or removed.
4. After installing roof jack on furnace top collar, check to make sure
there is no gap in back or side between the pipe collar and the fur-
nace casing top.
INSTALLATION IN SNOW REGIONS
When the combustion air pipe inlet is covered or 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 accumu-
lation on the roof exceeds 4" or in H.U.D. Snow Load Zones, a roof jack
extension (Part No. 7680B6541 ) is recommended.
LOCATING AND CUTTING ROOF JACK OPENING
To facilitate the proper installation of the roof jack, it is very important
that the roof jack opening in the ceiling and roof be on the same vertical
center line as the furnace flue collar. See Figure 21 or 22.
Mark this location on ceiling and scribe a circle with a 5" radius (10"
diameter) around this mark. Cut opening for roof jack through ceiling
and roof. (If furnace was installed during construction, cover furnace
and flue opening to prevent debris from entering flue when hole is cut
for roof jack.)
INSTALLING ROOF JACK IN THE ROOF
(See Figures 21 and 22 for Dimensional requirements.)
Insert roof jack into opening in the roof.
The roof jack should be secured to the furnace before roof flange (flash-
ing) is secured to the roof. This will insure a better alignment of the flue
pipe and furnace flue collar. Caulk around and under roof flange to pro-
vide a water tight seal, before securing roof jack flashing to roof.
1. Provide protection for Vent Connector and Air-Intake Connector
from damage and debris.
2. Mark Roof Jack center line on ceiling. Cut a 5" radius (10" diame-
ter) hole through ceiling.
3. Mark Roof Jack center line on roof. Cut oblong hole through roof.
4. Insert Roof Jack through roof opening. Do not secure Roof Jack to
roof.
Connect Roof Jack to Furnace
1. Verify gasket is around outside of Air-Intake Connector. Install new
gasket if missing or damaged.
2. Pull the Roof Jack's telescoping section down onto furnace. Fully
engage Roof Jack onto Vent Connector and Air-Intake Connector
and compress gasket. See Figure 24. Refer to Interior Roof Jack
Extension installation instructions, if applicable.
3. Align holes in Roof Jack and Air-Intake Connector. Secure Roof
Jack to furnace using #10 x 1/2 - 1-1/2" Type AB or Type B sheet
metal screw.
Secure Roof Jack to Roof
1. Apply caulk or other sealant to underside of Roof Jack flashing.
2. Locate Roof Jack such that pipes are plumb.
3. Secure Roof Jack flashing with nails, screws or staples.
4. Install roofing material over Roof Jack flashing.
5. Seal Roof Jack swivel joint with Chemcaulk 900 Sealant. Not
required for Roof Jacks with fixed slant flashing.
Complete Installation, as required
1. Install Exterior Roof Jack Extension, if applicable. Refer to installa-
tion instructions provided with Exterior Roof Jack Extension. Refer
to Figure 23.
14 Johnson Controls Unitary Products