Coleman Evcon DGAM075BDD, DGAT070BDD, DLAS075BDD, DGAT075BDD Installation Guide
035-20530-001 Rev. B (0804)
DGAT PROGRAM KIT 37323712001
INS TALLA TION INSTRUCTIONS
Heating _ Air Conditioning
FOR MODELS:
DGAM075BDD DGAT075BDD
DGAM075BDE DGAT075BDE
DGAM075BDF DGAT075BDF
DGAT070BDD DLAS075BDD
DGAT070BDE DLAS075BDE
DGAT070BDF DLAS075BDF
Use of this instruction is intended for qualified individuals experienced in the proper installation and service of manu-
factured housing heating appliances.
Fire or explosion hazard.
Failure to properly inspect and restore appliance to proper operation may cause property damage, personal injury or
loss of life.
General Information
A. Before You Start
Once you have read this instruction view the video tape.
1. Thoroughly review this instruction. Contact DGAT
Program at: 1-888-665-4640 or on line at dgatpro-
gram@york.com, if you have any questions.
2. Inspect kit contents
a. Three (3) piece heat exchanger liner assembly
i. Part A has two (2) curved hooks and four (4)
stainless steel bolts.
ii. Parts B and C have slotted holes.
b. Auxiliary limit switch assembly.
c. Customer Packet with instructions and labels
d. Card board "shoehorn" for auxiliary limit switch
assembly installation.
e. Natural gas orifice bag assembly, LP/Propane
gas orifice bag assembly, and hardware bag
assembly.
f. Wire clamps
3. Gather test equipment.
a. Digital Thermometer
b. 5/16" Hex head driver
c. Flashlight or droplight
d. Inspection mirror
e. Phillipshead screwdriver
f. Two (2) crescent wrenches
4. Tools needed to install DGAT Program Kit
a. 1/2" Wrench
b. 11/32" Nut driver
c. High temperature RTV Silicone - Source 1 Part
Number MA-HTSS-R
B. To Turn Off Gas to Appliance
These instructions will direct you To Turn Off Gas to Appli-
ance during the inspection. A label with these instructions is
located inside the lower door. The instructions are as follows:
1. Set the thermostat to lowest setting.
2. Turn off all power to the appliance.
3. Remove control access panel.
4. Move gas control switch to "OFF" position.
C. Operating Instructions
These instructions will direct you to follow the Operating
Instructions to place the appliance in operation. A label with
the Operating Instructions is located inside the lower door.
The Operating Instructions are as follows:
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance.
3. This appliance is equipped with an ignition device
which automatically lights the burner. Do NOT try to
light the burner by hand.
4. Remove control access panel.
5. Move gas control switch to "OFF" position. Do not
force.
6. Wait five (5) minutes to clear out any gas. If you smell
gas, determine source and repair as necessary.
7. Move gas control to "ON" position. Do not force.
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035-20530-001Rev.B(0804)
8. Replacecontrolaccesspanel.
9. Turnonallelectricalpowertotheappliance.
10.Setthermostattothedesiredsetting.Burnerwill
light,whichmaytake30-60seconds.
11.Afterthree(3)trials,iftheappliancewillnotoperate,
followtheinstructionsTO TURNOFFGASTO
APPLIANCEandrefertotroubleshootingguideinthe
InstallationInstructionsorOwner'sManual.
Part 1: Basic Information
Record the following on the DGAT Program Claim Form.
Record information clearly and legibly.
Most of this information should be available before travelling
to the job site.
A. Rating Plate Data
1. Model Number
Part 2: Inspection
D. Product Specifications
Model No. DGAT070 DGAT075
Input 70,000 Btu/hr 75,000 Btu/hr
Output 57,000 Btu/hr 61,000 Btu/hr
Air Temperature 45_75OF
Rise Range
Maximum Outlet
Tem peratu re
Maximum External
Static Pressure
2. Serial Number
g.
Customer Data
1. Customer name, street address, city, state and zip
code.
2. Customer telephone number.
165°F
0.30" wc
A.
Inspect Roof Jack
1. Verify the proper Roof Jack is being used. The DGAT
is approved for use with the 4000 Series roof jack
only. See Figure 1.
4000 SERIES
7900 SERIES
FIGURE 1: Roof Jack
NOTE:
The 7900 Series Roof Jack can be converted to a
4000 Series Roof Jack by replacing crown. Use pin
4000-6941tC.
2.
inspect Roof Jack. Replace if damaged, tilted,
crooked, or shows deterioration.
3.
Remove bird screens or other obstructions to com-
bustion air inlet.
B. Remove Assembly Burner
FIGURE 2: Turn power switch to off position.
1. Follow instructions TO TURN OFF GAS TO APPLI-
ANCE.
2. Disconnect wires to gas valve, igniter, and flame sen-
sor.
3. Turn off gas supply to furnace by closing manual
shut-off valve. Disconnect gas supply piping.
4. Remove gas valve. See Figure 3.
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FIGURE 3: Gas valve removal
5. Remove the burner assembly. See Figure 4.
When burner is removed, check the ribbon porting, located in
the end of the burner to insure it is concentric and square.
Reference Figure 5. Check the seams between the burner
halves to insure that they are completely closed and tight.
The flame spreader needs to be checked for proper align-
ment and to insure that it is not distorted and the burner
mounting legs should also be checked for distortion. If any of
these items are found to be out of alignment, the burner
should be replaced..
035-20530-001Rev.B(0804)
C. Inspect Heat Exchanger
1. Insert inspection mirror through burner opening. Use
flashlight or droplight to illuminate surface. Inspect
entire interior perimeter of heat exchanger. Note con-
dition per following guidelines.
a. Typical Discoloration Pattern
i. Surface must be smooth shape with no bumps
or indentations.
ii. Normal heat pattern may include light to dark
gray discoloration. See Figure 6.
iii. If visual inspection does not reveal any defor-
mation, crack, or burn through of the heat
exchanger surface, then you need to check the
entire inside surface of the heat exchanger by
feel. If you feel any roughness, deformation,
crack or burn through, proceed with replacing
the heat exchanger with 37323713001.
FIGURE 4: Burner assembly removal
FIGURE 5: Burner inspection
FIGURE 6: Typical discoloration pattern
b. Cracked. See Figure 7.
FIGURE 7: Cracked heat exchanger
c. Deformed. See Figure 8.
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035-20530-001Rev.B(0804)
FIGURE 8: Deformed heat exchanger
replaced.
d. Burn Through. See Figure 9.
FIGURE 9: Burned through heat exchanger
While you are feeling the inside surface, you should also
check the integrity of the rivets that secure the overflame baf-
fle to the heat exchanger drum. You can check the rivets by
pushing against each of the four (4) mounting legs. If any of
the rivets are missing, the heat exchanger will need to be
Part 3: DGAT Program Kit Installation
FIGURE 10: Overflame baffle located in top of heat
exchanger assembly (cut-away view).
D, Corrective Actions
1. Heat Exchanger cracked, deformed or burned
through or 1 or more overflame baffle pop rivets are
missing. Replace heat exchanger with 37323713001
Replacement Heat Exchanger. Follow instructions
provided with kit.
2. If heat exchanger burn through has resulted in dam-
age to the furnace casing insulation and/or a breach
in the furnace casing, you will need to contact the
DGAT program at: 1-888-665-4640 or on line at dgat-
program@york.com to receive authorization to
replace furnace.
3. Heat Exchanger exhibits normal discoloration pattern
with no defects.
a. Install DGAT Program Kit 37323712001. Follow
instructions in Part 3.
A. Install Heat Exchanger Liner
FIGURE 12: Remove burner inlet pan 12 screws as
FIGURE 11: Remove pressure switch tube.
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marked and remove burner inlet pan.
035-20530-001Rev.B(0804)
FIGURE 13: Remove bottom screw from air vane,
loosen top screw and rotate air vane counterclockwise.
Use caution when rotating air vane so that foil faced
insulation is not damaged.
FIGURE 14" Remove burner chute mounting screws
(4) and remove burner chute.
FIGURE 16: Rotate liner upward to hook on overflame
baffle.
FIGURE 17: Make sure the hooks on Part A straddle
the rear right-hand leg of overflame baffle.
FIGURE 15: Insert stainless steel liner piece (Part A)
with clips first.
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FIGURE 18: Push Part A of liner as far forward as leg
will allow.
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