PV500-9 04-2000
(4)
Section 9
POWER GAS BURNER START-UP (Con’t)
20. Direct Spark Ignition – (DSI) Burners – No pilot:
1.
Connect a manometer to the manifold test port. Set
the air shutter as shown on the tag attached to the
gas train. This may not be the exact setting you end
up with, but it is a good starting point. Turn the unit
on using the rocker switch on the side of the control
enclosure assembly. The burner should come on
and ignition occur. If the burner fails to ignite, there
may have been air in the line. To reset the control,
turn the switch off for 60 seconds (S89 controls only)
and it should automatically reset or push the reset
button on the control. Once the burner fires, set the
manifold pressure at the valve shown on the tag
attached to the gas train. There will a tap on the
downstream side of the valve to measure pressure.
The manifold pressure must be taken downstream of
the gas valve. Check the incoming pressure with the
burner running. This is recorded as flow pressure
and must be a minimum of 8” W.C.
21. Make final settings of the air shutter by checking the
flue gas analyzer.
A.
The readings need to be taken from a hole in the
vent several inches above the heater vent
connection, but before draft regulator.
B.
Insert draft gauge into the 1/4” test opening in the
stack. Draft in stack should read -.02 to -.06 W.C.
Adjust draft regulator, if installed.
C.
When water in the tank is above 120°F°, insert CO
2
tester in 1/4” test opening and take CO
2
reading in
percentage. CO
2
reading at this time will probably be
below optimum.
D.
Gradually close the air shutter, taking CO
2
reading at
each adjustment of air shutter until optimum CO
2
percentage (8-10%) is reached. If CO
2
percentage
decreases, open air shutter to last reading where the
greatest reading was achieved.
E.
Insert CO tester in 1/4” test opening and take CO
reading. CO should not exceed .03%. A reading
greater then .03% indicates lack of air. Open air
shutter slightly and take readings until CO is within
proper range. Optimum reading is no CO.
F.
If air shutter has been changed during CO test, take
a final CO
2
reading.
G.
Insert stack temperature gauge in 1/4” test opening
and read gross stack temperature. Temperature
should be as shown in Table 9-1. If an excessively
high gross stack temperature is recorded, check the
flue tubes for baffles. All tubes should have at least
one baffle for TURBOPOWER
modules. Record the
length of the baffles on TURBOPOWER
models for
future use.
H.
Make sure the air shutter is locked securely in place.
STACK TEMPERATURES
SERIES
MAX. GROSS
STACK
*MIN. NET
STACK
PG
(Vertical Tube)
550°F
300°F
TP
TPO
TPGO
375°F
300°F
TABLE 9-1
* Net temperature is the total stack temperature, less room temperature.
22. On burners with pilots, recheck pilot to make sure its
operation has not deteriorated if adjustments are made
to the air shutter. To do this, shut off the main valve,
check the flame response signal by cycling the burner
through several lightoffs.
23. Check each operating and limit control to be sure they
function properly by lowering and raising the
temperature setting on each control, causing the burner
to cycle on and off.
NOTE: During the initial firing of the burner, smoke that
is not related to the burner will be emitted from the
heater. This is normal during “burn in” and could
possibly continue for several days.
24. Record the following information for future use:
A. Air shutter position__________________________
B. Manifold gas pressure____________________"W.C.
C. Stack draft_____________________________"W.C.
D. CO2 reading______________________% (8%-10%)
E. CO reading__________________% (less than .03%)
F. Stack temperature:
Gross_____________________________°F
Less ambient_______________________°F
Net_______________________________°F
G. Thermal efficiency_________________________%
