15
1
3
6
9
10
11
12
13
7
17
16
18
20
19
8
4
5
2
15
14
STARTUP
STARTUP PROCEDURES
SPARK IGNITOR
Item
Description
A
Spark gap
5/32” (.156”) (4.0 mm)
+/- 1/32” (.031”) (.8 mm)
B
Sensor gap .208” (5.3
mm) reference
C
Spark electrode
D
Ground prong
•
CAUTION: Verify electrical supply is shut off before removing burner cover.
Verify gas supply is shut off before removing gas pipe plugs and connecting
manometers to measure gas pressures.
•
IMPORTANT
: Check serial plate for requirements and factory settings. Check and,
if necessary, adjust the inlet gas pressure BEFORE checking the manifold gas
pressure. Then adjust the manifold gas pressure, if necessary.
•
Remove the burner cover by removing the 4 sheet metal screws from the topside of
the burner cover.
•
Remove the 1/8 NPT pipe plug from the inlet test point (IP) and connect manometer.
See the GAS SUPPLY AND GAS PRESSURE section.
•
Loosen, Do Not Remove, the set-screw, or remove the 1/8 NPT pipe plug from the
manifold test point (MP) on the gas valve (break the tamper seal) and connect
manometer. See the GAS SUPPLY AND GAS PRESSURE section.
•
Some models have a shutoff dial on the gas valve. Depress the dial on the gas
valve, and make sure the gas valve is in the ON position.
•
Turn on the electrical and gas supply and set the thermostat above the ambient room
temperature, to call for heat.
•
Measure the inlet gas pressure and the manifold gas pressure.
•
For proper sequence of operation see the OPERATION AND SHUTDOWN section.
•
If heater does not operate normally, see the TROUBLESHOOTING section.
•
Once startup testing is complete, turn off electrical and gas supply, remove the
manometer connections and replace the 1/8 NPT pipe plugs or tighten the set-screws
into the inlet and manifold test points. Turn on electrical and gas supply and check
again for gas leaks. See the GAS SUPPLY AND GAS PRESSURE section.
•
Cycle the heater several times by means of the thermostat, allowing at least five
minutes between cycles. If the heater operates normally, replace the burner cover
and screws.
•
If the heater is vented directly outdoors, observe and verify the flue gases exiting
from the exhaust vent are not impinging on building materials or equipment. See the
EXHAUST VENTING section.
E
Flame sensor
BURNER DIAGRAM
Item
Description
Item
Description
Item
Description
1
Safety chain bracket
8
Inlet test point (IP)
15
Air flow switch
2
Tubing adapters
9
Gas inlet ½“ NPT
16
Air orifice plate
3
Main orifice
10
Gas valve
17
Inlet air collar accessory
4
Vinyl tubing
11
Manifold test point (MP)
18
Blower
5
Burner core assembly
12
Ignition lead wire
6
Ignitor bracket
13
Ignition detection control (IDC)
19
Blower motor enclosure
accessory
7
Observation port
14
Validation lights
20
Inlet air collar accessory
AIR FLOW SWITCH TUBING CONNECTIONS
•
The switch “P1” or “+” or “HIGH” side tube goes toward the blower side.
•
The switch “P2” or “–” or “LOW” side tube goes toward the ignitor side.
A
B
C
D
E
