J OIL-E-08 2008
Weekly Test (Daily test plus)
1st. Low Water
1.Withtheburnerring
2. Switch the pump interrupt switch to the pump interrupt position.
3. Byevaporationlowerthewaterlevelintheboileruntiltherstlowwateralarmsounds
and the low water indicator lamp illuminates, and the burner shuts down
4. Switch the pump interrupt switch to the pump on position.
5. The pump will start and restore the water level to the normal position and switch off.
6. Afterapproximately17secondsfromrestoringtherstlowwaterlevelthelowwateralarmwill
cancel, the low water lamp will extinguish, and the burner will restart
2nd. Low Water
1. Withtheburnerring
2. Switch the pump interrupt switch to the pump interrupt position
3. By evaporation lower the water level in the boiler until the low water alarm sounds, the second low
water reset switch illuminates, and the burner shuts down.
4. Switch the pump interrupt switch to the pump on position.
5. The pump will start and restore the water level to the normal position and switch off.
6. After approximately 17 seconds from restoring the second low water level the second low water
relay can be reset.
7. To cancel the second low water level alarm and light, depress the second low water reset switch
8. The burner will restart.
Note: These tests can be carried out consecutively, however it is possible that if the boiler is under load
conditionsthesecondlowwateralarmwilloccurimmediatelyaftertheburnerhasshutdownonrstlow
water, without the apparent loss of any more water. The reason is the collapse of the steam bubbles at the
water level surface when the heat is removed. The degree of collapse could be such that the water level will
disappear from the bottom of the site glass before the alarm sounds. Should this happen the second low
water level alarm should be checked by lowering the water level slowly by partially opening the main blow-
down valve.
Spirax High Integrity Level Controls, continued.
Pump Interrupt Switch
C
C
39
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