Energy Tech Laboratories CL Series, 40 Series, F3, F5 manual Maintenance and Service Instructions

V. Maintenance and Service Instructions

A. MAINTENANCE OF LOW WATER CUT- OFF DEVICES

WARNING

Probe and float type low water cut-off devices require annual inspection and maintenance.

1.Although these devices are solid state in their operation, the probe is exposed to possible contamination in the boiler water and subject to fouling.

2.It is important to physically remove the probe from the boiler tapping annually and inspect that probe for accumulation of scale or sediment.

3.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.

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.

c.Disconnect wiring connections between the low water cut-off control and the probe.

d.Remove the low water cut-off control from the probe.

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 cut-off control on the probe.

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 cut-off check out procedure in Section IV. Operating & Service Instructions.

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 from the system in order to prevent an unsteady water line and carry over of the water into the supply main above boiler.

Operate the boiler with steam in the entire system for a few days allowing the condensate to return to the boiler. If the condensate can temporarily be wasted, operate boiler only for the length of time it takes for condensate to run clear. If the latter cannot be achieved or if the condensate is returned to the boiler, boil out the boiler using the SURFACE BLOW-OFF connection.

i. Drain boiler until 1” of water is visible in gauge glass. Run temporary 1½” NPT pipe line from the surface blow-off connection to an open drain or some other location where hot water may be discharged safely. Do not install valve in this line.

ii. Drain about 5 gallons of hot water from boiler into a container and dissolve into it an appropriate amount of recommended boil out compound. Remove safety valve & add solution to boiler water thru exposed tapping using a funnel.

30