![SECTION Ix: MAINTENANCE AND SERVICE INSTRUCTIONS](/images/new-backgrounds/44997/4499789x1.webp)
SECTION Ix: MAINTENANCE AND SERVICE INSTRUCTIONS
A.MAINTENANCE OF LOW WATER CUT- OFF DEVICES
WARNING
Probe and float type low water
1.PROBE TYPE LOW WATER
It is important to physically remove the probe from the boiler tapping annually and inspect that probe for accumulation of scale or sediment.
Follow these steps to inspect, clean and/or replace the probe:
a.Turn off electric service to the boiler.
b.Drain boiler water to a level below the tapping for the probe.
c.Disconnect wiring connections between the low water
d.Remove the low water
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.
e.Unscrew the probe from the boiler tapping.
f.Inspect that portion of the probe that is exposed to the boiler water for a scale or sediment buildup.
g.Light deposits may be removed by wiping the probe with a damp cloth. Wiping the probe with a cloth soaked in vinegar will remove more tenacious lime deposits. The most stubborn deposits may be removed from the probe by using a diluted amount, 3 parts of water to 1 part of phosphoric acid (H2PO4).
CAUTION
Exercise caution when handling phosphoric acid and follow the instruction label on its container.
h.Clean the pipe threads of the probe to remove old, hardened pipe dope and other foreign matter.
i.Apply a moderate amount of good quality pipe dope to the pipe threads on the probe, leaving the two end threads bare. Do not use PTFE (Teflon) tape.
j.Screw the probe into the boiler tapping.
k.Mount the low water
l.Reconnect the control to probe wiring.
m.Fill the boiler to its normal waterline.
n.Add boiler water treatment compound as needed
(refer to Paragraph B.).
o.Restore electric service to the boiler.
p.Fire burner to bring the water in the boiler to a boil to drive off free oxygen.
q.WARNING — BEFORE RETURNING
BOILER TO SERVICE: Follow the low water
2.FLOAT TYPE LOW WATER
Low water
Complete replacement mechanisms, including necessary gaskets and installation instructions are available from the manufacturer.
B.BOILER AND SYSTEM CLEANING INSTRUCTIONS FOR TROUBLE FREE OPERATION
1.STEAM BOILERS
a.Oil, greases & sediments which accumulate in a new boiler and piping must be removed in order to prevent an unsteady water line and carry over of the water into the supply main above boiler.
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