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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.
Heater 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 Section 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.
adjusted incrementally to obtain the desired pool
operating temperature.
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 10 minutes.
3.5 Heater Shut Down
1. If heater is firing, turn operating control to lowest
value, wait 10 minutes for pump to stop running,
then turn power switch to off.
2. If heater is not firing, turn power switch to off.
3.6 Spring and Fall Operation
Standby Service
Turn the thermostat down to approximately
70°F (21°C). This will prevent the pool and
surrounding ground from becoming chilled and also
permit the pool to be raised to swimming temperature
in a shorter time.
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 heater cannot fire and
may freeze and be damaged.
3.
Improper Use of Heater:
This pool heater 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.
IMPORTANT
For proper operation the bypass and outlet valves must be
adjusted to obtain the correct heater
temperature rise and the
correct inlet temperature.
SEE SECTION 3D IN THE I&O MANUAL FOR THIS PROCEDURE!
LAARS Heating Systems
