Weil-McLain 2 Series Manual page 82

®
SlimFit Series 2
Startup procedure
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 accordance with Na-
tional Fuel Gas Code, ANSI Z223.1/NFPA 54 – latest
edition, and/or the Natural Gas and Propane Installa-
tion 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 altitudes of
2000 ft. to 4500 ft. above sea level. Please use appropri-
ate Fan Speed Settings for High Altitude provided in
this manual.
In Canada for elevation beyond 4500 feet. Please con-
sult 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 temperature
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 Troubleshoot-
ing, 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 dur-
ing 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 combustion test
instrument.
(or O ) and for CO. The CO
6. Test for CO
2 2
Figure 75, page 83. If results are acceptable, proceed to step 7.
82
COMMERCIAL CONDENSING GAS
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 in
2
-
FIRED WATER BOILER
IF NOT, follow the instructions under "Gas valve adjustment
procedure" to set the CO
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.
5400
Gas valve adjustment procedure
5100
DO NOT attempt to adjust the gas valve settings un-
4500
less you are a qualified technician, and with the use of
calibrated combustion test instruments. Adjust 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 combustion
values at high fire (as per page 82) to verify boiler is in adjustment
include: difficulty igniting, poor flame stability at low fire, combus-
tion 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
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
2
screw CLOCKWISE with a 3mm Al-
len wrench to lower the input. Allow
the boiler to stabilize and take anoth-
er reading. Continue until the desired CO
d. If the CO
CLOCKWISE to increase the input. Allow the boiler to
stabilize and take another reading. Continue until the desired
CO value is achieved.
2
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).
— Boiler Manual
values. See WARNING in next column.
2
is HIGH, turn the throttle
is LOW, turn the throttle screw COUNTER-
2
Part number 550-100-180/0917
reading.
2
value is achieved.
2