Filter
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Pentair Water Commercial Pool and Spa
Page 14
and 1825 pool temperature should be maintained at
70°F (21°C) or above. See item 3 in the next section.
3.7 Winter Operation
Complete Shutdown
1. To shut down the heater for periods of several
months or more, turn manual main gas valve and
pilot gas valve to "OFF." Where danger of
freezing does not exist, some water should flow
through the heater during the normal filter cycle
all year long, even when the heater is turned off
or shut down completely, if all bypass valves are
opened.
2. If the heater is not protected from freezing
temperatures, it should be completely drained
before the first frost. Drain the heater by
removing the drain plug on the bottom of the
front header casting. Leave the plug out until
ready to use the heater again. Heater must be
level to permit adequate draining. When
compressed air is used to blow out lines, it is still
necessary to follow the above procedure.
Keeping the pool heated and the filter pump
running continuously will not be adequate
protection. If there is a pump failure or an
electrical power failure, the boiler cannot fire
and may freeze and be damaged.
3. Improper Use of Heater: The heating boiler is
not designed for continuous use as an "anti-
freezing" device for pools. Operating the heater
with low water temperatures will cause the fins
on the heat exchanger to be partially blocked
with condensation. Incomplete combustion and
prolonged operation under these conditions will
result in the heat exchanger sooting up. This can
seriously damage the heater and may create a
dangerous fire hazard.
3.8 Time Clock Operation
During the warm-up period, the heater must run
continuously so it can raise the pool temperature from
cold to above 70°F (21°C).
Remove all time clock stops and permit the
heater to raise pool temperature to 70°F (21°C) or
above in one continuous operation.
When the time clock stops are replaced, be sure
to allow the filter pump and the heater to stay on long
enough to keep the pool up to the desired temperature.
3.9 Therapeutic Pools (Spas)
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. For the purposes of this manual, any
application in which the water temperature is
maintained above 85°F (30°C) is considered a spa.
SPECIAL SET-UP AND OPERATING
PROCEDURES APPLY TO SPAS.
1. Models 1010I and 1010E and larger should not
be used for spas due to their higher temperature
rises.
2. Since outlet temperatures can approach 140°F
(60°C) units must be piped in a primary-
secondary style, similar to that shown in Figure
10.
3. To insure that the spa inlet water does not exceed
104°F (40°C), the spa filter pump must circulate
at the minimum flow rates shown in Table 5.
Boiler Model Minimum Filter Pump Flow Rate
500 220 GPM
600 270 GPM
715 320 GPM
850 380 GPM
Table 5. Minimum Filter Pump Flow Rates For Spas.
Note: Maximum Spa Temperature Is
Assumed To Be 100°F (38°C).
4. The high limit stop should be changed to 140°F
(60°C). The set point should then be checked
following the procedure in 3.3.
5. Use the outlet valve “A” to set the inlet
temperature per section 3.4.
6. Spas 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:"
a. Spa or hot tub water temperature should
never exceed 104°F (40°C). A temperature
of 100°F (38°C) is considered safe for a
healthy adult. Special caution is suggested
for young children.
b. 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.
c. Pregnant women beware! Soaking in water
above 102°F (39°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°F (38°C) maximum rule.
d. Before entering the spa or hot tub, users
7. An adjustable pump time delay relay is mounted
in the control panel (see Figure 11). This relay
keeps the pump running after the burners shut
off. The delay should be set to 5-6 minutes for
models 500-850 and 9-10 minutes for models
1010-1825.