CARE
AND
MAINTENANCE
WATER
BOILERS
CAUTION:
•
The boiler area should be kept free of combustible materials, gasoline and other flammable liquids.
•
The boiler and venting system must be kept free of obstructions of the air louvers and draft hood
relief openings.
•
The following procedures must be conducted as outlined to assure safe operation of the boiler.
•
All cover plates, enclosures, and guards must be in place at all times, except during maintenance
and servicing.
3.1 CLEANING THE BOILER AND SYSTEM - NEW SYSTEMS
PRE-BOIL OUT FLUSHING OF SYSTEM
Much of the dirt and contamination in a new hot
water system can be flushed out before the boil
out of the system. First, flush the system of waste
with clear water. The boiler and circulating pumps
must be isolated through the successive zones of
the system to waste, carrying chips, dirt, pipe joint
compound, etc. with it. Follow with a chemical
flush. The removal of pipe chips and other debris
from the system before opening the isolation
valves to the boiler and pumps will help to protect
this equipment from damage by such debris.
In combination with system contamination,
bacteria from ground water boiler water may
produce objectionable odors, sometimes
resembling natural gas. It is important to keep
these fumes from air intakes which would
distribute them throughout the building.
BOIL OUT PROCEDURE
The boil out of the boiler and system is neither
difficult nor expensive. The chemicals needed for
cleaning are readily available. Trisodium
phosphate, and sodium hydroxide (lye) are the
most commonly used chemicals. Use only one
type of solution in the system. The amount of
chemical required will vary according to
conditions, but one pound per fifty gallons of
water is suggested.
Fill the system with this solution, venting all air.
Then, with the circulating pump running, bring the
system to design or operating temperature. After
circulating water for two to three hours, the
system should be drained completely, and refilled
with fresh, softened water. Usually enough of the
cleaning solution will adhere to the piping to result
in an alkaline solution satisfactory for operation. A
pH reading between 7 and 8 is preferred. If
necessary, to increase the pH, a small amount of
cleaner may be added.
IMPORTANT
The boil out procedure outlined must be
performed by, or under the direct supervision of,
a qualified technician. The chemicals used
present a hazard of burns and physical injury if
mishandled. Always use suitable face mask,
goggles, protective gloves and garments when
handling caustic chemicals. Do not permit the
chemical to come into contact with skin or
clothing. Always follow the safety precautions on
the container's label. Add chemicals slowly and in
small amounts to prevent excessive heat and
agitation.
DRAINING THE SYSTEM
A clean neutral hot water system should not be
drained, except for an emergency or when
unavoidable for servicing of equipment. See
Section 3.3 for water treatment required when
refilling.
Содержание AB Series
Страница 22: ......
