Heat Wise SU-2A Manual page 11

COMMISSIONING/TROUBLESHOOTING CHECKLIST
There are four factors that are needed to operate the gas burner:
____ 1. Combustion Air
____ 2. Electricity
____ 3. Gas Flow
____ 4. Combustion Analysis
1. Combustion Air
Check the air coming into the area where the burner is located.
____ 1. If the burner is in a large area that air can come into freely (i.e. an open
basement for home heating systems), then the air supply should be
sufficient for the burner.
____ 2. If the burner is in an enclosed area (i.e. small room or closet) then
fresh air must be supplied to the burner. The intakes to the area must
terminate facing down in order to avoid obstructions. The total open free
area must be 1 in
Example
2. Electricity
Check burner wiring
____ 1. Check that 120VAC is coming into the burner
____ 2. Check that the burner is properly grounded using a ground wire
____ 3. Check the polarity to the burner is correct.
(To check polarity: Set a multimeter to VAC. Touch L1 to one of the probe tips and ground to
the other. If a voltage between 110 and 125 is shown then it has the correct polarity; if any
other reading is shown, then check the L2 wire. If the L2 wire shows a voltage between 110 and
125 is shown then the polarity to the burner is reversed.)
3. Gas Flow
____ 1. Check that the capacity of the meter can meet the demand of the burner and all other appliances
running off the meter.
____ 2. Check that the burner is on a direct pipe from the meter.
____ 3. Measure the total length of all the pipe and count the number of elbows (1 90
Compare the total feet of pipe and the BTU demand using the chart on Page 5 to determine the size of
the pipe required.
____ 4. Check that the proper orifice is installed if needed.
____ 5. Check the gas pressure at the gas valve (line pressure). This pressure should be between 5" wc and
10" wc when the burner is not firing. Note: When checking manifold pressure, do not subtract
burner pressure during valve-on delay.
____ 6. With the burner firing the pressure drop on the supply side should not exceed 2" wc. If the pressure
drops and then surges back up double check the piping because it means the pipes are undersized.
4. Commissioning the Burner
____ 1. Check the head and air settings and start the burner.
____ 2. Use a combustion analyzer to check CO
must be less than 400 ppm but we suggest less than 100ppm. If the CO
should be opened to reduce the CO
____ 3. Check the manifold pressure to verify that it is at the specified pressure.
2
per 10,000 BTU input
150,000 Btu/hr firing Rate
( )
150 , 000 BTU / hr *
10
; if the CO
2
( )
2
1 in
2
= 15 in
, 000 BTU / hr
and CO. CO should be between 9% and 9.8% and CO
2 2
2
is below 8%, then the air should be closed to increase CO
2
o
elbow=3 ft. of pipe).
is greater than 9.8% then the air
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