Burner Operation - Heat Wise SU-3 Manual

Before turning the burner on, check for gas supply leaks. Check the wiring diagrams; install
manometers before and after the gas valve. Keep the observation port of the boiler or furnace open.
Follow the instructions on the nameplate of the burner to turn it on. Follow the sequence of operations
for the control (see page 9). Record the readings below.
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
2
must be 1 in per 10,000 BTU input
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 housing
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
less than 400 ppm but we suggest less than 100ppm. If the CO
opened to reduce the CO
____ 3. Check the manifold pressure to verify that it is at the specified pressure. Note: When checking manifold
pressure, do not subtract burner housing pressure during valve-on delay.
____ 4. Clock the gas meter and check that the correct firing rate is achieved. If the firing rate is low, the
gas pressure should be increased slightly. If the firing rate is too high then the gas pressure should
be decreased. (Usually if the stack temperature is below 300F the firing rate is too low. If the stack
temperature is over 600F then the firing rate is usually too high or on rare occasions the heat exchanger is
blocked up)

Burner Operation

350,000 Btu/hr firing Rate
( )
350 , 000 BTU / hr *
10
and CO. CO
2
; if the CO is below 8%, then the air should be closed to increase CO
2 2
( )
2
1 in
2
= 35 in
, 000 BTU / hr
should be between 9% and 9.8% and CO must be
2
is greater than 9.8% then the air should be
2
o
elbow=3 ft. of pipe).
.
2
16