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SlimFit
Series 3
Startup — final checks
❏
Check vent piping and air piping
1. Check for gas-tight seal at every connection and seam of air
piping and vent piping.
Venting system must be sealed gas-tight to prevent flue
gas spillage and carbon monoxide emissions which will
result in severe personal injury or death.
❏
Check gas piping
1. Check around the boiler for gas odor following the procedure
of page 48 of this manual.
If you discover evidence of any gas leak, shut down
the boiler at once. Find the leak source with bubble
test and repair immediately. Do not start boiler again
until corrected. Failure to comply could result in severe
personal injury, death or substantial property damage.
❏
Propane boilers — verify conversion
1. Verify propane orifice has been installed per Propane Conver-
sion instructions.
DO NOT adjust or attempt to measure gas valve
outlet pressure. The gas valve is factory-set for the
correct outlet pressure. This setting is suitable for
natural gas and propane, requiring no field adjust-
ment. Attempting to alter or measure the gas valve
outlet pressure could result in damage to the valve,
causing potential severe personal injury, death or
substantial property damage.
SlimFit boilers are shipped ready to fire natural gas
ONLY. You must install the propane orifice if the
boiler will be connected to propane. See page 9.
Failure to comply could result in severe personal
injury, death or substantial property damage.
❏
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 95 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 combustion
test instrument.
6. Test for CO
(or O
) and for CO. The CO
2
2
1% of the values listed in Figure 73. If results are acceptable,
proceed to step 7. IF NOT, follow the instructions under "Gas
valve adjustment procedure" on page 87 to set the CO
See WARNING in next column.
86
COMMERCIAL CONDENSING GAS
(continued)
values must be within
2
values.
2
—
-
FIRED WATER BOILER
If combustion at either high or low fire is
outside the range given in Figure 73, fol-
low the procedure given for adjusting the
throttle screw on the gas valve. If throttle
screw adjustment does not correct the
problem, then shut down the boiler and
contact your local Weil-McLain represen-
tative. Throttle screw adjustment must
be done only by a qualified technician,
using calibrated test instruments. Failure
to comply could result in severe personal
injury, death or substantial property
damage.
Acceptable CO
be within 1.0% of these values)
550
750
These values are for altitudes up to 5,500 feet. For higher
altitudes, CO
may be slightly lower and CO slightly higher.
2
1. Measure natural gas input:
a. Operate boiler 10 minutes.
b. Turn off other appliances.
c. At natural gas meter, measure time (in seconds) re-
quired to use one cubic foot of gas.
d. Calculate gas input:
3600 x 1000
number of seconds from step c
e. Btuh calculated should approximate input rating on
boiler rating label.
2. Use the Control display to navigate to Manual test mode
(see Figure 68, page 78) and force the firing rate to Low
(low fire).
3. Look at the flame through the flame inspection window.
The low fire flame should be stable and evenly distributed
over burner surface with a uniform orange color.
4. Repeat the combustion test of steps 5 and 6 above.
5. Use the Control display to navigate to Manual test mode
(see Figure 68, page 78) and force the firing rate to AUTO
(normal operation).
6. Re-install the flue gas temperature sensor.
Boiler Manual
and CO values (CO
2
2
2
2
= Btuh
Part number 550-100-168/0516
must
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