Repair manual

SERVICING INSTRUCTIONS — MECHANICAL WATER FILL
FOR STEAM GENERATOR
The water level in the sight gauge should normally be about
2/3 full. If it is not. then (1) the water valve may be scaled up or
(2) the water valve plunger disc is in need of replacement or
(3) the adjusting screw at the top of the valve plunger is set
incorrectly or (4) the float needs to be replaced.
WARNING: Steam under pressure may cause serious
injury and bodily harm when it is accidentally or
carelessly released. Therefore, service of the steam
generator should only be performed by trained and
experienced personnel, thoroughly familiar with
servicing steam generators.
To service the water valve:
1. Turn oft all utilities and fuel to steam generator. Drain
steam generator.
CAUTION: Never work on the steam generator while It is
hot or pressurized.
2. Remove hand hole plate from steam generator. Refer to
separate data sheet for proper procedures and cautions.
3. (Inside the steam generator as shown on the diagram).
Remove the float arm pivot screw. Disengage float arm
assembly.
4. Lift out valve plunger disc and install new plunger disc.
5. Remove scale from valve seat and other internal valve
surfaces.
6. Re-insert plunger in valve.
7. Install float arm assembly and check the adjustment. Float
travel should be approximately 6 inches.
8. To increase the travel, turn adjusting screw clockwise. To
decrease, reverse.
9. Re-install hand hole plate, never applying more than 15
ft./lbs. torque to the nut. The hand hole plate should be
cleaned and examined every time it is removed. If the
hand hole plate is chipped or cracked, or over three years
old, install a new one. Because continuous use and
possible abuse 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. Replace the hand
hole gasket when re-installing the hand hole plate.
10. Close steam generator drain valve. Turn on utilities and
fuel.
11. Check the water level. Proper level in the sight gauge is
about 2/3 full.
12. Start up and observe steam generator long enough to see
that it is operating properly.
13. After the valve plunger disc is installed, order more to have
spares on hand at all times.
If hard water scale created the problem, the use of more
corrosion resistors or more frequent replacement of them is
required. Refer to separate data sheets for maintenance
instructions pertaining to scale problems.