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Daily
1. Check gauges, monitors and indicators.
2. Check instrument and equipment settings.
3. Check burner flame. (Should see light blue flame
at full input rate).
Weekly
For low-pressure heaters, test low-water cut-off
device. (With heater in pre-purge, depress the low
water cut-off test button. Appliance should shut-off
and ignition fault light should come on. Depress reset
button on front of heater control panel to reset).
Monthly
1. Check flue, vent, stack, or outlet dampers.
2. Test blower air pressure.
3. Test high and low gas pressure interlocks (if
equipped).
Semi-Annually
1. Recalibrate all indicating and recording gauges.
2. Check flame failure detection system components.
3. Check firing rate control by checking the manifold
pressure at full fire.
4. Check piping and wiring of all interlocks and shut-
off valves.
Annually
1. Test flame failure detection system.
2. Test high limit and operating temperature.
3. Check flame sensor.
4. Conduct a combustion test at full fire. Carbon diox-
ide should be 8.0 to 9.0% at full fire for natural gas,
and between 9.0 to 10.0% for propane 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 heater is operating). Test other
operating 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 tested.
6. Perform leakage test on gas valves.
7. Test air switch in accordance with manufacturer's
instructions. (Turn panel switch to the "On" posi-
tion until blower is proven, then turn the switch to
"Off."
8. Inspect and clean burner using shop air. Air must
be directed from outside of burner towards inside.
As Required
1. Recondition or replace low water cut-off device (if
equipped).
2. Check drip leg and gas strainers.
3. Check flame failure detection system.
4. Check igniter. (Resistance reading should be 42-
70 ohms at ambient temperature).
5. Check flame signal strength. (Flame signal should
be greater than 1 microampere DC as measured
at the 2 pins on the upper left corner of the ignition
control).
6. Check firing rate control by checking the manifold
pressure at full fire.
7. Test safety/safety relief valves in accordance with
ASME Heater and Pressure Vessel Code Section
IV.
7
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