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EX17DT and EX22DT Installation and Operation Manual 25
Instructions:
Natural Gas
Short Vent Lengths
1
:
0 - 7 ft (2 m) + 1 elbow (A1 - A4)
Long Vent Lengths
1
:
7 ft (2 m) +1 elbow - 13 ft (4 m) + 3 elbows (A1 - A4)
Propane Gas
Short Vent Lengths
1
:
0 - 7 ft (2 m) + 1 elbow (L1 - L4)
Long Vent Lengths
1
:
7 ft (2 m) +1 elbow - 13 ft (4 m) + 3 elbows (L1 - L4)
Altitude
0-2,000 ft
0-610 m
2,001-5,400 ft
611-1,646 m
5,401-7,800 ft
1,647-2,377 m
7,801-10,200 ft
2,378-3,109 m
0-2,000 ft
0-610 m
2,001-5,400 ft
611-1,646 m
5,401-7,800 ft
1,647-2,377 m
7,801-10,200 ft
2,378-3,109 m
Manifold test
pressure - W.C.
Low
0.44 in.
(11 mm)
0.48 in.
(12 mm)
0.54 in.
(14 mm)
0.60 in.
(15 mm)
0.68 in.
(17 mm)
0.74 in.
(19 mm)
0.82 in.
(21 mm)
0.92 in.
(23 mm)
Manifold test
pressure - W.C.
High
1.6 in.
(40 mm)
1.4 in.
(35 mm)
1.2 in.
(32 mm)
1.1 in.
(29 mm)
2.7 in.
(69 mm)
2.4 in.
(61 mm)
2.2 in.
(55 mm)
2.0 in.
(50 mm)
EX22DT
Manifold test
pressure - W.C.
Low
0.44 in.
(11 mm)
0.48 in.
(12 mm)
0.54 in.
(14 mm)
0.60 in.
(15 mm)
0.68 in.
(17 mm)
0.74 in.
(19 mm)
0.82 in.
(21 mm)
0.92 in.
(23 mm)
Manifold test
pressure - W.C.
High
2.6 in.
(65 mm)
2.2 in.
(57 mm)
2.0 in.
(52 mm)
1.8 in.
(47 mm)
4.0 in.
(101 mm)
3.5 in.
(89 mm)
3.1 in.
(80 mm)
2.9 in.
(72 mm)
EX17DT
Code A1 A2 A3 A4 L1 L2 L3 L4
1. Turn off the gas and the power
supply.
2. Remove the 5 screws that hold the
louver assembly and front panel.
Lift the panel straight up and then
remove it.
3. Remove two pressure point screws
(1/8 NPT tap) with 3/16 Allen
wrench. Install two 1/8 in. barb
fittings (field-supplied). Attach the
manometer to both pressure points.
Both pressure points must be used
in order to measure the differential
pressure. Ensure that the
manometer is properly calibrated.
4. Turn on the gas and power supply
to the furnace.
5. Ensure the "Set Back" feature has
been deactivated. ("Set Back"
feature is active by default.)
6. With the unit in the Off position,
press the Test Switch at the top,
right of PC board until it beeps.
7. Select the correct code for gas
type, altitude, and vent length on
the LED display using ▲ and ▼
buttons. Refer to the table below.
Table 8: Gas Pressure
Figure 28
Pressure
Point
(Positive)
Pressure
Point
(Negative)
Nozzle
Manifold
Test
Switch
PC
Board
1
Short and long vent lengths apply to EX17DT and EX22DT models.
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