ES 30A - ES36A - HP 30A Electric Steam Generator
Installation, Operation and Maintenance Manual
_____________________________________________________________________________
5
lWCO/PUMP CONTROL, OPERATION AND TESTING
1.
All valves for incoming water supply are to be fully opened. Main disconnect switch to be in "ON” position. Boiler switch to be in
"ON" position. Since boiler will be empty, pump (or solenoid) will be energized allowing boiler to fill with water. Control will allow for
automatic reaching of proper water level. Contactors will be energized, applying voltage to heating elements.
2.
Pump Switch Operation – At this point, water should be visible approximately halfway up sight glass. Slowly open drain valve located
at bottom of boiler. Water level will fall, allowing low water cutoff/pump control to energize feed water system. Close drain valve for
proper operation.
3.
Low Water Cut-Out Switch Performance. Open drain valve completely. Maintain this condition until water level falls within gauge
glass enough to cause low water cut-out switch to de-energize heating elements. Contactor will be in the de-energized state at this
time. Close the drain valve. For automatic resetting type low water cut-out switches, feed system will return water level to normal.
Boiler is now qualified for proper low water cut-out and normal liquid-level operating conditions.
PRESSURE CONTROLS OPERATION AND TESTING
NOTE: ALL ES STEAM BOILERS ARE PROVIDED WITH ONE HI-LIMIT PRESSURE CONTROL AND ONE OPERATING
PRESSURE CONTROL.
1.
All pressure controls are equipped with a screw allowing for setting of the desired operational and hi-limit pressures.
To reduce pressure setting, rotate screw in direction which allows indicator to point to a lower pressure setting.
NOTE: IT IS RECOMMENDED THAT THE HI-LIMIT CONTROL BE SET 1O PSIG ABOVE DESIRED NORMAL
OPERATION PRESSURE.
2.
A differential pressure can be obtained on all automatic re-setting operating pressure controls in the same manner as operating
pressure control is set. Differential indicated pressure below the main operating maximum pressure the pressure control will reset.
3.
Pressure Control Operating Check – Close steam outlet valve (by customer) and adjust operating pressure control to a low pressure
setting. Set hi-limit control at 10 PS1G above that setting. Switch boiler on to allow for steam pressure build-up. Pressure gauge
reading will build and the operating pressure control will shut off boiler at its pressure setting. Re-setting of operating pressure control
is accomplished by bleeding off pressure through steam outlet valve (by customer) and allowing pressure to drop below set point.
4.
Hi-limit Pressure Control Check – See item 3 above but, in doing so,
assure for this test purpose only,
that the operating control is
set above the pressure setting of the hi-limit control. The hi-limit trip will de-energize the contactors. Resetting of the hi-limit occurs
after bleeding steam to reduce pressure inside the boiler.
TO AVOID IMPROPER OR UNSAFE CONDITIONS, INSURE OPERATING PRESSURE CONTROL IS
RESET TO PROPER DESIRED BOILER OPERATING PRESSURE.
ONLY WITH MAIN DISCONNECT “OFF”, TIGHTEN ALL ELECTRICAL CONNECTIONS BEFORE ENERGIZING
BOILER TO PREVENT ARCING, CARBONIZING OF CONTACTS AND/OR OVERHEATING.
1.
Turn on water supply. Turn main switch on. Turn boiler switch to ON position. When water appears approximately halfway up the
gauge glass, the pump or solenoid feed will automatically shut off and the contactors will switch on.
2.
Operation of Low Water Cut-Off – The boiler is equipped with a probe type liquid level control which is coupled to an electronic
controller (pc board).
IMPORTANT NOTE
: If the boiler is equipped with an AUX LWCO, it can be tested by holding down the reset button for 5 seconds.
3.
The automatic reset operating pressure control has a visual pressure adjustment. The top screw of the control adjusts the scale in the
large indicator window. By turning the screw, the pressure setting can be adjusted. Selection of desirable pressure is very easily made.
Some pressure controls have an additional screw for adjustment of pressure differential (OFF/ON pressure operating range) which is
factory set at the maximum allowable rating.
4.
Close steam outlet valve. Boiler will build up to desired pressure and shut off automatically.
5.
High Pressure Control – This control will de-energize the boiler should pressure within the boiler exceed the set pressure.
6.
Slowly open steam outlet valve and use steam as needed.
7.
Boiler should be blowndown daily (see blowdown instructions on page 6).
Pre-Operation Check - All Boilers
Operation
!
C A U T I O N
!
C A U T I O N