10
SYSTEM START-UP
1. Make sure all strainer blow down valves are closed
and capped to prevent accidental burns.
2. Open 1/4 NPT feedback control line shut-off valve.
3. Close inlet valve to main valve. Open outlet gate
valve and all equipment drain valves. Allow system
to drain completely.
4. Make sure bypass globe valve is tightly closed.
5. Release any actuating force on pilot(s).
Spring
Close pilot valve by equally unscrewing
adjusting nuts to release compression
on the adjusting spring.
Air
Adjust Air PRV Regulator to 0 psig
(0.00 bar)
Temperature Set temperature adjusting knob to the
lowest setting.
NOTE: On
STPA-300 and STPA-400 pilots,
loosen
the calibration set screw and move the pointer out
the way. Gently turn the adjustment knob clockwise
until the seat is completely closed.
This requires that
the pilot be recalibrated, see "Adjusting Temperature
Pilots", page 11.
Solenoid
Make sure normally open solenoid is
open or normally closed solenoid is
closed.
6. Slightly open steam supply inlet valve. Open only
enough to allow steam into the system.
7. Apply a small amount of force to the pilots.
Spring
Gradually compress adjusting spring
by tightening adjusting nuts equally
until the pilot valve opens.
Air
Adjust Air PRV to allow pressure to
build slightly until the air pilot valve
opens.
Temperature
Increase temperature setting a couple
of degrees at a time.
Pneumatic
Dial in temperature and adjust air
Temperature
supply pressure to 9 psi (0.62 bar).
8. Allow system to stabilize.
9. Open steam supply inlet valve slightly more. A little
pressure will build on the inlet to the regulator, which
allows it to open and steam to flow.
10. Close all equipment drain valves.
11. Open supply inlet valve more.
12. Allow system to stabilize.
13.
Check for any leaks.
Allow time for the piping to heat
up and the drip trap to drain condensate.
14. Slowly allow pressure to build until the inlet gate
valve is about half open. If there are no problems
open inlet gate valve completely.
15. Refer to "Adjusting Pilot(s)", page 11, for final pilot
adjustments.
Never open a reducing valve without positive indication
that the high pressure side is clear of condensate. Be
sure no one is in area of any open end of pipes when
steam is turned on. Failure to follow this caution may
result in serious burns.
!
CAUTION
Hearing protection is required if drain valves are open to
atmosphere. Failure to do so may result in hearing loss.
!
CAUTION
