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SlimFit
Series 2
®
Startup procedure
Figure 74
Blower speed — required settings (High altitude
means installations above 5,500 feet)
Low fire
Boiler
Factory
High
Factory
setting
altitude
(rpm)
(rpm)
SF1000
1300
1600
SF1500
1200
1500
SF2000
1025
1350
In the USA Input rates are derated 4% for each
1000 ft. above sea level, beyond 2000 ft. in accor-
dance with National Fuel Gas Code, ANSI Z223.1/
NFPA 54 – latest edition, and/or the Natural Gas
and Propane Installation Code, CAN/CSA B149.1.
For elevations above 10,000 feet, please contact
Weil-McLain Technical Support for details.
In Canada, Input rates are derated 10% for alti-
tudes of 2000 ft. to 4500 ft. above sea level. Please
use appropriate Fan Speed Settings for High
Altitude provided in this manual.
In Canada for elevation beyond 4500 feet. Please
consult Provincial Authorities having jurisdiction
and/or local codes.
To start the boiler
1. Turn OFF the boiler ON/OFF switch.
2. Read and follow the Operating Instructions, Figure 78,
page 85.
3. The control will initialize and follow its sequence of operation
(see page 62).
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch off?
2. Is external limit control (if used) open? Is boiler water tem-
perature above 200 °F?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure greater or less than required on
page 45?
6. Are parameters set correctly as per this manual?
7. Is the warm weather shutdown activated?
8. If none of the above corrects the problem, refer to Trouble-
shooting, beginning on page 93.
Check flame & combustion with
instruments
1. Initiate a call for heat on one of the heat demand inputs.
2. Access the Control installer menus by pressing and holding
the UP and DOWN arrow keys for five seconds.
3. Use the Control display to navigate DIAGNOSTICS to Manual
test mode (see page 92 for proper instructions on forcing
rates during Manual Test Mode) and force the firing rate to
High (high fire).
4. Look at the flame through the flame inspection window. The
high fire flame should be blue and should be stable. The burner
surface should be covered with orange dots.
5. Remove the flue temperature sensor from the flue pipe and
insert a combustion test probe., using a calibrated combus-
tion test instrument.
6. Test for CO
(or O
) and for CO. The CO
2
2
in Figure 75, page 83. If results are acceptable, proceed to
step 7. IF NOT, follow the instructions under "Gas valve ad-
82
commercial condensing gas
Ignition
High fire
High
Factory
Maximum
setting
altitude
setting
setting
(rpm)
(rpm)
(rpm)
(rpm)
2200
2900
5200
2300
3000
4900
1600
2100
4300
values are listed
2
— Boiler Manual
-
fired water boiler
justment procedure" to set the CO
in next column.
You must re-install the flue gas sample port cover
to prevent flue gas spillage into the boiler room.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Gas valve adjustment procedure
5400
5100
DO NOT attempt to adjust the gas valve settings
4500
unless you are a qualified technician, and with the
use of calibrated combustion test instruments. Ad-
just the valve settings only as needed to meet the
combustion values given in Figure 75, page 83.
1. This procedure is only necessary when combustion tests
indicate the need, as explained under "Check flame &
combustion with instruments, page 82."
2. Boiler behavior that might indicate a need to check combus-
tion values at high fire (as per page 82) to verify boiler is in
adjustment include: difficulty igniting, poor flame stability at
low fire, combustion noise or high carbon monoxide values.
3. Combustion readings must be taken at both high fire and
low fire.
Adjust valve at high fire
1. Use the Control display to navigate to Manual test mode.
(See page 92 for proper instructions on forcing rates during
Manual Test Mode). After the boiler has had time to stabilize
and high-fire RPM value (see Figure 74) is reached, take a
CO
reading.
2
a. See Figure 76, page 83 to adjust if necessary.
b. Remove the blue cover on the throttle screw opening
with a straight-bit screwdriver.
Make only small (1/8 -turn) throttle screw adjust-
ments. Adjustment can be sensitive, especially
on propane. Navigate to
DIAGNOSTICS — Manual
test mode (see page 92 for
proper instructions on test-
ing).
c. If the CO
throttle screw CLOCKWISE
with a 3mm Allen wrench to
lower the input. Allow the boiler to stabilize and take
another reading. Continue until the desired CO
value is achieved.
d. If the CO
CLOCKWISE to increase the input. Allow the boiler
to stabilize and take another reading. Continue until
the desired CO
e. Re-install the blue cover on the gas valve.
Adjust valve at low fire
1. Lock the boiler into low fire using the Control module screen.
Verify that the blower rpm value is correct for low fire (see
Figure 74, page 82).
2. Check the combustion readings.
3. If results are acceptable at low fire, verify high fire readings
again. Restore firing rate to AUTO.
4. If combustion results are not acceptable, remove the cover
screw over the offset adjustment (see Figure 76, page 83).
Navigate to DIAGNOSTICS — Manual test mode (see page 92
for proper instructions on testing).
values. See WARNING
2
is HIGH, turn the
2
is LOW, turn the throttle screw COUNTER-
2
value is achieved.
2
Part number 550-100-561/0224
2
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