Weil-McLain 2 Series Manual page 83

®
SlimFit Series 2
Startup procedure
If combustion at either high or low fire is
outside the range given in Figure 75 , follow
the procedure given for adjusting the thrott le
screw on the gas valve. If thrott le screw ad-
justment does not correct the problem, then
shut down the boiler and contact your local
Weil-McLain representative. Th rott le screw
adjustment must be done only by a qualifi ed
technician, using calibrated test instruments.
Failure to comply could result in severe per-
sonal injury, death or substantial property
damage.
Acceptable CO
High fi re
Boiler
CO
The high fi re CO
Note 1 may vary with conditions, but must not be
lower than 8.5% nor higher than 10.0%.
The low fi re CO
may vary with conditions, but must not be
Note 2
higher than the high fi re CO
0.5% less than the high fi re CO
Gas valve adjustment locations
for use by a qualifi ed technician,
using calibrated combustion test
instruments)
Throttle screw
adjustment (high fi re)
Offset adjustment
(low fi re)
Part number 550-100-180/0917
COMMERCIAL CONDENSING GAS
(continued)
and CO values
2
Low fi re
CO
listed is typical. The value
2
listed is typical. The value
2
nor more than
2
.
2
(ONLY
Solenoid indicator
lights (V1 & V2)
-
FIRED WATER BOILER
5. Use a T40 Torx driver to adjust the sett ing. Rotate clockwise to increase
CO , rotate counterclockwise to decrease CO
2
when completed.
6. Consult your local Weil-McLain representative if acceptable results cannot
be obtained for both high and low fi re.
Adjust and test boiler controls
1. Follow instructions in this manual to set and verify operation of the
boiler controls.
Check ignition system safety shutoff device
1. Aft er the boiler has been installed, turn off the boiler.
2. Shut off the manual gas valve located on the gas line to stop fl ow of fuel
to the boiler.
3. Turn on the boiler. It will start the ignition sequence, but will not light.
Aft er some time, the boiler will lockout, the display screen will turn red,
and the Control will fl ash "Ignition Fault". It means that the boiler tried
to ignite without success for fi ve (5) times and went into Lockout mode.
Th is means that the ignition system safety device worked properly.
4. Clear the Lockout condition by selecting "Manual Reset" in the
Diagnostic Menu.
5. Open the manual gas valve located on the gas line to resume fuel supply
to the boiler.
Gas valve test pressure tapping
Use tapping P on gas valve body for pressure connection
after gas valve 1 or between the gas valve seats.
Gas valve leakage testing
DO NOT connect a manometer to the manual gas valve or the
automatic gas valve. Th e high vacuum from the blower could
pull fl uid into the gas line, possibly damaging the gas valves.
1. Refer to the gas valve manufacturer's instructions for the procedure to
test the valve.
2. To operate the two valve solenoids independently, navigate to the Valve
Test Screen on the Control (see Figure 57, page 65 for access sequence).
3. When in the Gas Valve Test Screen, you will see two options:
a. Open Gas Valve 1
b. Open Gas Valve 2
4. To open only gas valve 1, highlight it and press enter/save.
5. While still in the Gas Valve test screen, give the boiler a call for heat.
Th e boiler will go through it's normal Ignition sequence, but will only
open Gas Valve 1.
— Boiler Manual
. Re-install the cover screw
2
Use manual gas valve
side tapping for pressure
connection after gas valve 2.
83