Sussman ES Installation, Operation And Maintenance Manual - page 11
Sussman Boilers
Installation, Operation & Maintenance Manual
Pressure Controls, Operation and Testing
11
Note:
All boilers are provided with one high limit pressure control and at least one operating pressure control.
1.
The high limit pressure control is equipped with a manual reset feature. There is no subtractive differential scale
with this type of control
2.
All pressure controls are equipped with an adjusting screw, allowing for setting of desired operational and high
limit pressures. To reduce pressure setting, turn adjusting screw in direction that allows indicator to point to a
lower pressure setting on the scale. To increase pressure setting turn adjusting screw in direction that allows indi-
cator to point to a higher pressure on the scale
Note:
It is recommended that the high limit control be set 10psig above the desired normal operating pressure.
3.
Operating pressure controls, except low pressure (15psig) types have a separate differential scale. Differential indi-
cates pressure below the main operating maximum pressure, the pressure control will re-set. The differential set
point is adjusted in the same manner by turning the adjusting screw in the desired direction to increase or
decrease the differential pressure value.
4.
Operating pressure control check: Close steam outlet valve [supplied by customer] and adjust operating pressure
control to 20psig and the differential to 10psig. Set the high limit pressure control to 30psig. Switch boiler on to
allow steam pressure to build-up. Pressure gauge reading will increase and the operating pressure control will de-
energize the contactor(s) when the pressure gauge indicates 20psig. Open steam outlet valve to bleed off pres-
sure. When the pressure gauge reading decreases below 10psig (differential) the operating pressure control will
re-energize the contactor(s).
5.
High limit pressure control check:
FOR TEST PURPOSES ONLY!
Set the high limit pressure control 10psig lower than
the operating pressure control. Close the steam outlet valve and switch the boiler on to allow boiler to build pres-
sure. When the pressure gauge indicates the pressure at which the high limit pressure control is set, the high limit
pressure control re-set button will pop-up and the control will de-energize the contactor(s). Open the steam out-
let valve to bleed off pressure. The contactor(s) should not re-energize on pressure drop. The contactor(s) should
only re-energize when the pressure has dropped and the high limit pressure control reset button is depressed.
Operation
With main disconnect “OFF” tighten all electrical connections before energiz-
ing boiler to prevent arcing, carbonizing of contact and/or overheating
1.
Set the desired operating pressure and differential pressure on the operating pressure control.
2.
Set the high limit pressure control. [Recommended to be 10 psig above the operating pressure setting.]
3.
Turn on water supply.
4.
Turn main disconnect switch on.
5.
Turn boiler control switch on. The water feed will begin and continue until the water level reaches half way up
the gauge glass. The water feed will automatically shut off and the contactor(s) will energize.
6.
Boiler steam pressure will gradually increase to the operating pressure control set point, at which time the
contactor(s) will de-energize.
7.
With steam demand, the boiler steam pressure will decrease. When the boiler pressure has dropped below the
operating pressure control differential set amount, the contactor(s) will re-energize.
8.
The boiler is equipped with float type liquid level controls employing micro switches. They are extremely
sensitive and reliable and will maintain the proper water level within the boiler pressure vessel automatically
during boiler operation.
9.
The boiler should be blown down daily. (See blowdown instructions.)
!
CAUTION