MACH® Series
Gas-Fired Boiler
33
5 MAINTENANCE
5.1 M
AINTENANCE AND
I
NSPECTION
S
CHEDULE
This schedule applies when the boiler is in use. Verify proper operation after servicing.
Proper lockout/ tagout procedure must be employed when servicing this unit.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation.
Use care when reassembling main gas line to assure all connections are tight.
Use care when servicing boiler in order to prevent the accumulation of gas in or around
the combustion chamber.
Determine the cause of any lockout or errors before resetting the boiler. If able to
determine cause of lockout, then appropriate corrective action should be taken. If unable to determine cause of the
problem, call a qualified service technician. Verify proper operation after servicing.
5.1.1 Daily
Observe operating temperature and general conditions. Make sure that the flow of combustion and ventilating air to
the boiler is not obstructed. Determine the cause of any service codes or lockouts on the display panel. Observe any
unusual noises or operating conditions and make the necessary corrections. Notify responsible individuals for
required corrective action or repair.
Check daily to be sure that the boiler
area is free and clear of any combustible materials,
including flammable vapors and liquids.
5.1.2 Weekly
Observe the conditions of the main flame. A normal high fire flame is mostly orange with a blue halo, while at low fire
the burner will glow yellowish-orange.
Correct air adjustment is essential to the efficient operation of this boiler. Ensure that the flow of combustion and
ventilation air is not obstructed. If an adjustment in the combustion appears necessary, the flue gas composition
should be checked with a carbon dioxide (CO
2
) or oxygen (O
2
) analyzer and compared to the values stated in Table
3-1 of section 3.11.2.1. If an adjustment in the combustion is necessary, call a qualified and knowledgeable installer or
service agency that has been trained on the Patterson-Kelley MACH
®
boilers.
5.1.3 Monthly
1. Using the control panel, enter the information mode and scroll down view the flame signal. This is measured in
micro-amps of flame conductivity.
2. Test high-limit Control. Refer to Section 3.9.3.
3. Test operating temperature controls by reducing or increasing temperature setting as necessary to check burner
operation.
