BLOWDOWNS
The importance of proper cleaning and maintenance of the Levalarm cannot be stressed enough. The
Levalarm must he kept clean to ensure the water level in the gage glass accurately represents the
water level in the boiler. Note that the frequency and method of blow-down may affect service life and
performance of the Levalarm.
The connection lines to the Levalarm can become clogged with sediment and indicate a normal water
levels when water may be low. After performing the blow-down procedure, if the water level does not
appear to return to normal promptly, the connecting piping may be partially clogged and have to be
cleaned.
Clark-Reliance suggests the following blow-down procedure:
1. Close both the steam and water valves between the boiler drum and the Levalarm unit.
2. Open the drain valve fully on the bottom of the Levalarm piping.
3. Crack open the steam valve and allow a gentle rush of steam to pass through the device. The
steam should not pass through for longer than 20 seconds.
4. Close the steam valve.
5. Close the blow-down valve and simultaneously open the steam and water valves, slowly bringing
the equipment back to a normal operating level.
6. Water should enter the Levalarm quickly when the blow-down valve is closed. This will indicate that
the lines are free of sludge, sediment, or scale buildup.
Note:
1. Any trip or alarm circuits that are actuated by the equipment being blown-down should be
bypassed to prevent false alarms during the blow-down process. A Clark-Reliance model HS-0 can
be used to by-pass the Low Water Cutout to prevent a false trip during the blow-down procedure.
2. Blow-down should be conducted on a weekly basis, or as necessary, based on water quality.
SPECIFICATIONS
Connection sizes: EA100D/EA100DP: 1” FNPT
EA100S/EA100SP: 1” FNPT
EA100SW: 1” FSW
Pressure Rating: EA100D/EA100DP: 350 PSI @ 432° F.
EA100S/EA100SP: 800 PSI @ 520° F.
EA100SW: 800 PSI @ 520° F
Float Switch Rating: UL listed and CSA approved SPDT
5A-125 VAC, 5A-250 VAC
1/2A-125 VAC, 1/4A-250 VAC
Switch Max. Temperature: 400° F.
Environment: Indoor or outdoor
