EPV SERIES CONDENSING WATER BOILER
34-501 07/13
17
MAINTENANCE (con't)
8.
The need to periodically check water level controls and waterside of the pressure vessel cannot be over
emphasized. Most instances of major boiler damage are the result of operating with low water or the use of
untreated (or incorrectly treated) water.
Every boiler is equipped with an electronic low water cutoff. This device senses continuity between a probe
located in the top of the tank and the water to verify the presence of water. It is important to check the
operation of this device periodically.
9.
This boiler may be equipped with a float-type low water cutoff. Since low water cutoff devices are generally set
by the original manufacturer, no attempt should be made to adjust these controls to alter the point of low water
cutoff. If a low water device should become erratic in operation or if it's setting changes from previous
established levels, check for reasons and correct; repair or replace as required.
The controls operation may be checked by stopping the water supply to the boiler while the burner is operating
at low fire. While under constant attendance allow the water to lower at a normal rate. If a control does not
break the circuit to stop the burner at the proper point, then
SHUT DOWN THE BURNER IMMEDIATELY
.
Do not restart until all cross connecting piping is checked for obstructions. Also check the float bowl. If these
are clean, repair or replace the control. Repeat the above test to insure proper operation prior to returning the
boiler to service.
Remove the pipe plugs from the tees and crosses and make certain the cross connecting piping is clean and
free of obstructions. Controls must be mounted in a plumb position for proper performance.
Determine piping is vertically aligned after shipment and installation and throughout the life of the equipment.
The operation of the electronic low water cutoff may be checked in the same manner, by bypassing the
function of the float low water cutoff.
10.
It is important to blowdown the float low water cutoff devices when supplied. It is recommended that a short
blowdown be conducted daily. Float low water cutoffs should be equipped with test-n-check valves to allow
blowdown of low water cutoff without requiring complete drainage of the boiler.
11.
A boiler used for heating or seasonal loads or for standby service may have an extended period of non-use.
Special attention must be given so that neither waterside nor fireside surfaces are allowed to deteriorate from
corrosion.
There are two methods of storage – wet or dry. Your water consultant or feedwater treating company can
recommend the better method, depending upon circumstances in a particular installation. Section VII of the
ASME Code also contains information relating to laying up a boiler.
12.
Extended shutdown of the boiler and restarting are as follows:
•
Turn off all power and fuel supplies.
•
Enter boiler into dry storage.
•
Tag power switch(s) that fuel is off and tank is in storage condition.
•
Remove tank from storage and turn fuel and power switch(es) on to start. Reset all controls and
conduct startup of the boiler as discusses previously.