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X. Service Instructions
A. General. Inspection and service should be conducted
annually, except as noted. Turn off electrical power and
gas supply while conducting service or maintenance.
Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figures 48, 49, 50 or 51.
B. Maintenance of Low Water Cutoff
1. McDonnell & Miller PS-802 or Hydrolevel
CycleGard CG400 Probe Style Only.
a. Drain boiler to point below Tapping 'K'. See
Figure 2.
b. Disconnect wire(s) connecting control and probe.
c. Remove control from probe.
DANGER
Assure that the boiler is at zero pressure before
removing the LWCO probe. Do not rely on the
pressure gauge to indicate that the boiler is at
zero pressure. Open the safety valve to relieve
all internal pressure prior to proceeding. Safety
valve discharge piping must be piped such that
the potential for burns is eliminated.
d. Unscrew probe from Tapping 'K'. Inspect for
scale and sediment buildup.
e. Remove light deposits with damp cloth soaked
with vinegar.
f. Remove stubborn deposits using diluted
phosphoric acid (H
2
PO
4
) solution, 3 parts water
to 1 part phosphoric acid. Normal operation will
occur with up to 0.2 inch of contamination. If
scale or contamination exceeds 0.2 inches, clean
probe more frequently.
g. Clean Tapping 'K' to remove old pipe dope and
other foreign matter.
h. Apply moderate amount of good quality pipe
dope to probe threads, leaving two end threads
bare. Install probe in Tapping 'K'. Mount control
on probe. Attach wire(s) between control and
probe.
i. Fill boiler to normal waterline. Add water
treatment as needed.
2. McDonnell & Miller 67 Float Style Only.
a. Weekly (or more frequently if necessary). Open
blow-off valve to ush sediment chamber.
Follow instructions on Blow-Down Card afxed
to Jacket adjacent to low water cutoff.
b. Annually. Dismantle to extent necessary to
remove obstructions and insure proper function
of working parts.
DANGER
This boiler uses ammable gas, high voltage electricity, moving parts, and very hot water under high
pressure. Assure that all gas and electric power supplies are off and that the water temperature is cool
before attempting any disassembly or service.
Assure that all gas valves and electrical disconnect switches are off before attempting any disassembly
or service.
Do not attempt any service work if gas is present in the air in the vicinity of the boiler. Never modify,
remove or tamper with any control device.
WARNING
This boiler must only be serviced and repaired by skilled and experienced service technicians.
If any controls are replaced, they must be replaced with identical models.
Read, understand and follow all the instructions and warnings contained in all the sections of this
manual.
If any electrical wires are disconnected during service, clearly label the wires and assure that the wires
are reconnected properly.
Never jump out or bypass any safety or operating control or component of this boiler.
Read, understand and follow all the instructions and warnings contained in ALL of the component
instruction manuals.
Assure that all safety and operating controls and components are operating properly before placing
the boiler back in service.