Weil-McLain ULTRA299-S4 Manual page 41

S 4
®
ERIES GAS
Startup — fi nal checks
You must replace the fl ue gas temperature sensor to
prevent fl ue gas spillage into the boiler enclosure.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Ultra-399 propane con version & start-up
Ultra-399 boilers are converted for propane by adjustment of the
gas valve throttle screw (no orifi ce change) — Figure 41 . This must
only be done while using a combustion analyzer.
1. Turn the gas valve throttle screw clockwise 5 turns before start-
ing the boiler. Then follow the start-up procedure on page 40 .
2. Once the boiler is started, make slight adjustments to the throttle
screw to obtain a CO of 10.2% with CO less than 100 ppm air
2
free. (Allow the combustion analyzer's reading to stabilize before
making adjustments.)
3. After the boiler has been set up correctly, the conversion is
complete. Fill in the information on the propane conversion
label and attach the label to the boiler rating plate.
Throttle screw adjustment procedure
See Figure 39, page 40 , Figure 40, page 40 , or Figure 41 for location
of the throttle screw.
DO NOT attempt to adjust the throttle screw unless by
a qualifi ed technician, and with the use of calibrated
combustion test instruments. Adjust the throttle
screw only as needed to meet the combustion values
given in Figure 42 .
1. This procedure is only necessary when specifi ed elsewhere in
this manual or when combustion tests indicate the need, as
explained under "❏ Check fl ame & combustion with
instruments, page 40."
2. Boiler behavior that might indicate a need to check combustion
values at high fi re (as per page 40 ) to verify boiler is in adjust-
ment include: diffi culty igniting, poor fl ame stability at low fi re,
combustion noise or high carbon monoxide values.
3. Combustion readings must be taken at both high fi re and low
fi re. DO NOT attempt an adjustment of the throttle screw at
low fi re. Just check the combustion values.
4. Use the U-Control display to navigate to Manual test mode
(see Figure 115, page 102 ) and force the fi ring rate to MAX
(high fi re). After the boiler has had time to stabilize, take a
CO reading.
2
a. If the CO is HIGH, turn the throttle screw CLOCKWISE to
2
lower the input. Allow the boiler to stabilize and take another
reading. Continue until the desired CO
b. If the CO is LOW, turn the throttle screw COUNTER-
2
CLOCKWISE to increase the input. Allow the boiler to sta-
bilize and take another reading. Continue until the desired
CO value is achieved.
2
5. Lock the boiler into low fi re. Check the combustion readings. If
results are acceptable at low fi re, verify high fi re readings again.
Restore fi ring rate to AUTO.
6. Consult your local Weil-McLain representative if acceptable
results cannot be obtained for both high and low fi re.
Part number 550-100-400/0717
-
FIRED WATER BOILER
(continued)
value is achieved.
2
— Boiler Manual
❏
Adjust and test boiler controls
1. Follow instructions in this manual to set and verify
operation of the boiler controls.
Acceptable CO2 and CO values (CO2 values
must be within 1.0% of the values listed)
Ultra
NG 8.6
-80
LP 9.6
NG 9.0
-105
LP 10.1
NG 9.0
-155
LP 10.0
NG 9.0
-230
LP 10.0
NG 9.0
-299/310
LP 10.0
NG 9.2
-399
LP 10.2
The values above are with the boiler front door removed. Values
will typically increase about 0.2% once the door is reinstalled.
The values above are for altitudes up to 5,500 feet. For higher
altitudes, CO
may be slightly lower and CO slightly higher.
2
< 60 7.8 < 60
< 60 8.6 < 60
< 60 8.4 < 60
< 60 9.2 < 60
< 60 8.0 < 60
< 60 8.5 < 60
< 60 8.0 < 60
< 60 9.0 < 60
< 60 8.0 < 60
< 60 9.0 < 60
< 100 8.4 < 60
< 100 10.0 < 60
41