Repair manual

SERVICING PROBE SYSTEM: ELECTRIC WATER FILL AND
INSTRUCTIONS ELECTRIC LOW WATER FUEL CUT OFF FOR
STEAM GENERATOR-- 3 PROBE TYPE
6) Assemble probe extensions to probes on inside of steam generator so they hang vertically, parallel to each other-
Malfunctioning will occur if an extension touches any part of the steam generator or another probe extension
7) If insulation on electrical wires to the probe snows signs of being broken, cut or deteriorated, the wires should be replaced.
8) Connect wire terminals on outside of steam generator to probe terminals as follows:
Red wire to the shortest probe. Turns water off
Black wire to the intermediate probe: Turns water on.
White wire to the longest probe- Shuts off fuel (low water safety fuel shut-off).
9) Re-install hand hole plate and install a new gasket.
The hand hole plate should be cleaned and examined each time it is removed. If the plate is chipped or cracked, it should be
replaced immediately. Because continuous use and possible abuse can cause metal fatigue which weakens the hand hole plate,
a new one should be installed at least every three years. Replace the gasket at least once a year —or sooner if it is cracked or
hardened.
10) Replace probe cover and check to make sure that the cover does not contact probes.
11) Close steam generator drain valve. Turn on utilities and fuel supply to steam generator.
12) Operate and observe steam generator long enough to insure that it is functioning properly
Low Water Fuel Cut Off Test
Proper operation of the "Low Water" probe extension should be checked periodically, by someone who is
thoroughly familiar with the equipment.
To Test: Open the drain of the steam generator while fuel is on. When the water has drained below the "Low Water" probe, the
fuel should shut off automatically. Indication of fuel shut off should occur just as the water level in the sight gauge drops from
view. If it does, close the drain, allow the steam generator to refill, and resume normal operations, if the fuel does not shut off.
immediately turn the on-off toggle switch to the "off" position, and follow the steps outlined under "To Service the Probes or the
Probe Extensions" as given on the reverse side of this sheet.
For specific information pertaining to the operation of the electric water fill controls, and electric low water safety fuel cut-off,
refer to the following data sheets:
Electric Steam Generators
Gas-Fired Steam Generators
Steam Coil (electric operated) Generators