Weil-McLain Aqua Balance WMB-155 Manual page 74

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Final checks before lighting the boiler
• Open any on-off valves between boiler and the systems.
• Verify that there are no leaks of the gas system.
• Verify that the boiler and system are full of water and all
system components are correctly set for operation.
• Verify that condensate trap drain line is filled with water.
• Verify that there are no leaks in the system, DHW piping,
connections or boiler.
• Verify electrical connections are correct and securely
attached.
• Inspect vent piping and air piping for signs of deteriora-
tion from corrosion, physical damage or sagging. Verify air
piping and vent piping are intact and correctly installed
per this manual.
• Read the instructions to adjust and set up the boiler
control.
• Verify that the boiler model is set correctly in the boiler
control, and that it displays correctly.
To start the boiler
The combustion for this boiler has been
checked, adjusted and preset at the factory
for operation for Natural Gas.
Having checked:
• That the boiler has been installed in accordance with
these instructions.
• The integrity of the flue system and the flue seals.
• The integrity of the boiler combustion circuit and the
relevant seals.
1. Apply power to the boiler.
2. Follow the Operating Instructions, Figure 100, page 75.
Test Mode Operation
When entering Test mode operation the boiler will
fire without a call for heat.
Proceed to put the boiler into operation as follows:
1. To start create a demand for heat, open up a hot water faucet(s)
or turning up the thermostat. This way you will ensure that
during the "Test Mode" a heat load is created to "Dump" the
energy from the boiler.
2. To operate the boiler in test mode, press the CH "-" and
"+" keys together for 5 seconds (See below) to activate the
"TEST" mode.
Figure 99 Control in Test Mode
74
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ALL OUNT GAS FIRED WATER BOILER
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Boiler Manual
(continued)
3. The boiler lights at the maximum heating 100% rate displayed
on the LCD display.
4. The high fire (large) flame symbol will be displayed once the
boiler has lit.
5. Use DHW "-" button to drop firing rate to low fire.
6. To exit the "TEST" mode, press the CH keys (Items 3 and
4 Figure 76, page 60) together for 5 seconds, or leave the
boiler to automatically switch off after 15 minutes or stop-
ping DHW flow.
7. This TEST procedure is used to check/adjust combustion
CO and CO per specifications Figure 102, page 77 and
2
Figure 105, page 78.
If boiler does not start correctly
1. Check for loose connections, blown fuse or is boiler Not
plugged in?
2. Are external limit controls (if used) open? Is boiler water
temperature above 200°F?
3. Are thermostats set below room temperature?
4. Is gas turned on at meter and boiler?
5. Is incoming gas pressure less than the minimum values given
on page 16?
6. Are boiler control settings correct for the application?
7. If none of the above corrects the problem, refer to Trouble-
shooting, beginning on page 85.
Check system and boiler
❏
Check water piping
1. Check system piping for leaks. If found, shut down boiler and
repair immediately. (See WARNING on page 71 regarding
failure to repair leaks.)
2. Vent any remaining air from system using manual vents. Air
in the system will interfere with circulation and cause heat
distribution problems and noise.
❏
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 and inside the boiler jacket for gas
odor following the instructions in "Warning"on 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 in-
jury, death or substantial property damage.
CONTINUED AFTER NEXT PAGE
Part number 550-100-305/0118