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3D-3. Spring Start-up
To restart the heater in the Spring, have a profes-
sional service technician reassemble the heater as
follows:
1. Attach the copper tubing to the pressure switch
and fill the loop with SAE 50, non-detergent oil
(see Figure 21).
2. Tighten the drain plugs.
3. Turn on the main gas supply valve to the heater,
outside the heater jacket.
4. Turn on the heater following the lighting instruc-
tions found on the inside of the heater.
3E. Water Chemistry
Proper chemical balances are necessary for
sanitary bathing conditions as well as ensuring your
heater's long life. Be sure to keep your chemical levels
within the values indicated in Table 7. Teledyne Laars
does not warrant heat exchangers damaged by corro-
sive chemical levels or excess dissolved solids in pool
or spa water.
For spas, it is also necessary to perform water
changes in addition to chemical treatment. It is recom-
mended to change the spa water every 60 days for light
usage and every 30 days if usage is heavy.
3F. Spa/Hot Tub Safety Rules
WARNING
The following “Safety Rules for Hot Tubs,”
recommended by the U.S. Consumer Product
Safety Commission, should be observed when
using the spa.
1. Spa or hot tube water temperature should never
exceed 104°F (40°C). One hundred degrees
Fahrenheit (100°F [38°C]) is considered safe for
a healthy adult. Special caution is recommended
for young children.
Figure 21. Heater drain locations.
2. The drinking of alcoholic beverages before or
during spa or hot tub use can cause drowsiness
which could lead to unconsciousness, and subse-
quently result in drowning.
3. Pregnant women take note! Soaking in water
above 102°F (38.5°C) can cause fetal damage
during the first three months of pregnancy (which
could result in the birth of a brain-damaged or
deformed child). If pregnant women are going to
use a spa or hot tub, they should make sure the
water temperature is below 100°F (38°C) maxi-
mum.
4. The water temperature should always be checked
with an accurate thermometer before entering a
spa or hot tub. Temperature controls may vary by
as much as 4°F (-16°C).
5. Persons with a medical history of heart disease,
diabetes, circulatory or blood pressure problems
should consult their physician before using a hot
tub or spa.
6. Persons taking any medication which induces
Figure 22. Pressure switch copper tubing.