Pentair MT - Manual (Page 11)

MegaTherm Commercial Pool Heating Boiler Page 11
3F. Time Clock Operation
During the initial warm-up period, the boiler
must run continuously. Therefore, remove all time
clock stops until the pool water reaches a temperature
of at least 70
o F.
When resetting the time clocks, be sure to allow
the filter pump and boiler enough time to maintain the
pool water at the desired temperature.
3G. Spa (Hot Tub) Safety Rules
Therapeutic pools, or “spa” pools, are usually
piped and controlled so that very warm or hot water,
often with air injection, is forced at high velocity into
a confined area of a swimming pool or into a small,
separate pool. Both the energy of the water and the
heat furnish certain hydrotherapeutic benefits. These
pools are excellent for relaxation, body-conditioning,
and for arthritic and rheumatic problems, but can be
hazardous. The Consumer Product Safety Commission
has recommended the following “Safety Rules for
Hot Tubs.”
1. Spa or hot tub water temperature should never
exceed 104
o F (40 o C). A temperature of 100 o F
(38 o C) is considered safe for a healthy adult.
Special caution is suggested for young children.
2. Drinking of alcoholic beverages before or during
spa or hot tub use can cause drowsiness which
could lead to unconsciousness and subsequently
result in drowning.
3. Pregnant women beware! Soaking in water
above 102
o F (39 o C) can cause fetal damage
during the first three months of pregnancy
(resulting in the birth of a brain-damaged or
deformed child). Pregnant women should stick to
the 100
o F (38 o C) maximum rule.
4. Before entering the spa or hot tub, users should
check the water temperature with an accurate
thermometer; spa or hot tub thermostats may err
in regulating water temperatures by as much as
4
o F (2.2 o C).
5. Persons with medical history of heart disease,
circulatory problems, diabetes or blood pressure
problems, diabetes or blood pressure problems
should obtain their physician’s advice before
using spas or hot tubs.
6. Persons taking medications which induce
drowsiness, such as tranquilizers, antihistamines
or anticoagulants, should not use spas or hot
tubs.
3H. Periodic Service
Inspect the heat exchanger tubes of the Model
MT pool boiler on a regular basis. In most areas and
under most operating conditions, the MT pool boiler
will operate for years without accumulating any scale
in the tubes. However, in some pools the mineral
content of the water is such that completely scale-free
operation is impossible. For this reason, the MT boiler
was designed so that all of the internal wet surfaces
can be easily inspected and, if necessary, cleaned.
Simple cleaning tools are available from your dealer
or the factory.
In order to establish a proper inspection
schedule, the tubes should be inspected after the first
sixty days of operation, and again after 120 days.
From the appearance of the tubes, it will be possible to
determine the best regular inspection schedule.
When pool equipment is located outdoors, a
certain amount of dust and moisture can infiltrate the
mechanical parts of the controls. After many years,
this could cause deterioration. A regular service
schedule will insure longer life and safe operation of
the equipment.
3I. Pool Water Chemistry
Due to natural evaporation, which only removes
the water and leaves the minerals, the mineral content
of pool water increases daily. Also, the regular
addition of algaecidal and sanitizing chemicals
substantially adds to the mineral content of the pool. If
the mineral content of the pool is allowed to get too
high, the minerals will precipitate out of the water and
deposit on the walls of the pool, the filter, and the heat
exchanger tubes. For this reason, it is important that
the pool be completely drained regularly (at least
every two years) to reduce the chance of expensive
repairs to the pool, filter system and boiler.
It is also important to maintain the pH level of
the pool water between 7.3 and 7.7 which can add
years to the life of the pool finish, filter system and
boiler.
Most algaecidal and sanitizing chemicals contain
sodium hypochlorite, while others contain calcium
hypochlorite. Sodium is not a scaling chemical, but
calcium definitely is. So when chemicals are used
which contain calcium, it is even more critical that the
pH level of the pool water be maintained properly, and
that the pool water be completely changed when the
dissolved solids indicate an excessive mineral content.