SECTION FOUR – Routine Maintenance and Professional Servicing
Routine maintenance (such as, testing the water pres-
sure relief valve and the water pressure switch) shall be
performed:
A. Every 6 months.
B. Every 12 months.
C. At the start of each swimming season.
D. Both A and C above.
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Match each of the control system components with its
appropriate function:
____ Air Flow Switch (AFS)
____ Automatic Gas Shutoff (AGS) Switch
____ Ignition Control Module
____ High Limit Switch
____ Control Board
____ Thermistor
____ Transformer
____ Water Pressure Switch
a) This component has a set of diagnostic lights which
warn if a safety interlock is open.
b) This switch permits the burner to start only when
the water pressure reaches 3 psi.
c) This component provides low-voltage power to the
heater .
d) This component will prevent the burner from start-
ing if air flow through the Air Orifice is insufficient.
e) This switch is marked black.
f) This component monitors the inlet water
temperature.
g) This component receives line voltage for powering
the Blower.
h) This switch is marked re d.
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The gas orifice meters the flow of gas to the burner.
Indications that too little gas being burned include:
(select all that apply)
____ Rough, rumbly burner noise.
____ T h e i n d i c a t o r l i g h t i s o n .
____ A high-pitched whistle.
____ P r onounced exhaust odor.
____ Delayed or noisy ignition.
The Combustion Air Blower includes the:
A. Air Orifice
B. Air/Gas Mixing Tube
C. Negative-Pressure Regulator
D. both A and B above.
Respond to the following statements “Yes” or “No”.
When replacing or reassembling the Combustion Air
Blower , use isopropyl alcohol (rubbing alcohol) to
check that the blower’s outlet flange is tight and not
leaking.
Yes ____ No ____
When burning natural gas, the acceptable level of CO
2
is between 9.2 and 10.5 percent.
Yes ____ No ____
Match each of the burner system components with its
appropriate function:
____ Combustion Air Blower
____ Combination Gas Valve
____ Flameholder
____ Gas Orifice
____ HSI Igniter
a) This component incorporates dual gas shut-off
valves and a negative-pressure regulator.
b) This component supports the flame in the combus-
tion chamber.
c) This component supplies air and gas to the combus-
tion chamber.
d) This component is heated electrically to ignite the
burner .
e) This component meters the flow of gas to the
burner .
4-42
Service
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