3. Remove 2 screws attaching intermediate front panel to left and right side jacket panels.
4. Remove draft diverter and intermediate front panel as 1 unit.
5. Carefully remove cerafelt gasket strips.
6. Clean passageways between sections with a flexible handle wire brush. Remove dirt from bottom of boiler and between sections by
vacuuming.
7. Make sure all flame ports in burners are open and clear. Shake out or blow out all loose dirt in burners.
8. Reseal seams between adjacent sections as necessary with 400°F RTV silicone sealant.
9. Reassemble all parts. Be sure to check tightness of pilot connections and condition of burner flames after reassembly. (See Fig. 21 and 22.)
10. Be sure vent pipe connections to chimney are secure and no obstructions are present.
PROCEDURE 8—FOAMING, PRIMING, OR SURGING
These terms are used to describe a fluctuating water line—when water leaves boiler with steam.
It is caused by any combination of the following:
1. Threading oil and organic matter in boiler water. (Mineral oil or core sand does not cause surging.) Follow instructions in Cleaning Boiler
section.
2. Faulty quick vents that do not release air until a sizeable pressure is built up. If old style, replace. If dirty, clean so it is easy to blow through
valve.
3. Improper header design—when steam flows in opposite direction of equalizer line on "Hartford Loop." Generally, a 15-in. horizontal run
between riser and main takeoff allows entrained water to fall out of steam vapor so it can return to boiler. (See Fig. 3, 4, and 5.)
4. Adjustment of steam limit control to a wide differential increases difficulty if quick vents are old style, slow-releasing type, or dirty. Always
set steam limit control differential as low as possible.
5. Soap and detergents in boiler water cause extreme surging. Boiler cleaners and chemical cleaning additives are not recommended. If used
and not rinsed properly, they will do more harm than good. The cleaning procedures laid out in these instructions clean out typical oils and
impurities found in new boilers and in residential heating systems. The best thing for boiler and heating system is clean water with no
additives.
CAUTION: Never refill a hot boiler with cold water or thermal shock may crack boiler components (sections).
PROCEDURE 9—BOILER WATER TREATMENT (OTHER THAN CLEANERS)
In steam systems where system is tight, free from leaks, and all steam is returned to boiler as condensate, the amount of make-up water is small.
Water treatment is generally not required.
In steam systems where less than 90 percent of steam is returned as condensate, or with very hard or corrosive make-up water, treatment may be
desirable. Follow recommendations of local boiler water treatment specialist.
PROCEDURE 10—BETWEEN HEATING SEASONS
Boilers should not be drained between heating seasons. Steam boilers should be entirely filled with water during summer months to exclude air.
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