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Weekly
For low-pressure boilers, test low-water cut-off device.
(With boiler in pre-purge, depress the low water cut-
off test button. Boiler should shut-off and ignition fault
light should come on. Depress reset button on front of
boiler control panel to reset).
Monthly
1. Check flue, vent, stack, or outlet dampers.
2. Test blower air pressure. (See the I&O Manual.)
Replace the filter when the intake air pressure
increases by –0.5 in. WC from the reading record-
ed on the start-up checklist.
3. Test high and low gas pressure interlocks (if
equipped). (See "Safety Inspection" in the I&O
Manual.)
Semi-Annually
1. Recalibrate all indicating and recording gauges.
2. Check flame failure detection system components.
3. Check firing rate control by checking the mani-
fold pressure. (See "Manifold Check" in the I&O
Manual.)
4. Check piping and wiring of all interlocks and shut-
off valves.
5. Check air filter and replace as necessary.
Annually
1. Test flame failure detection system and pilot turn-
down.
2. Test high limit and operating temperature. (See
"Post Start-Up Check" in the I&O Manual.)
3. Check flame sensor.
4. Conduct a combustion test at high and low fire.
Carbon dioxide should be 8.6 to 9.4% at full fire
for natural gas, and between 9.9 to 10.7% for pro-
pane gas. Carbon monoxide should be <100 ppm.
5. Check valve coil for 60 cycle hum or buzz. Check
for leaks at all valve fittings using a soapy water
solution (while boiler is operating). Test other oper-
ating parts of all safety shut-off and control valves
and increase or decrease settings (depending on
the type of control) until the safety circuit opens.
Reset to original setting after each device is test-
ed.
6. Perform leakage test on gas valves (See I&O
Manual).
7. Inspect and clean burner using shop air (See I&O
Manual).
As Required
1. Recondition or replace low water cut-off device.
2. Check drip leg and gas strainers.
3. Check flame failure detection system. (See "Post
Start-Up Check" in the I&O Manual.) Verify high
and low fire flame signal, compare to start-up data,
4. Check flame signal strength as noted on display.
5. Check igniter (Resistance reading should be
40-75 ohms at 77°F (25°C).
6. Check firing control by checking manifold pres-
sure. (See "Manifold Check" on I&O Manual).
7. Test safety/safety relief valves in accordance with
ASME Heater and Pressure Vessel Code Section
IV.
8. Inspect filter and replace as necessary.
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