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3C. Lighting and Shutdown
3C-1. Lighting the Heater
Lighting and shutdown instructions are listed on
the label attached to the inside of the service door and
also on the inside of the control compartment door.
Lighting instructions are as follows:
1. Turn off all electrical power to the heater at the
main junction box.
2. Open the control compartment door and turn the
gas valve to OFF.
3. Turn the rotary switch on the temperature control
panel to OFF.
4. Wait 5 minutes before trying to start the heater.
5. Turn the gas valve control knob counterclockwise
to ON (see Figure 26).
6. Replace the control compartment door.
7. Turn on electrical power to the heater.
8. Turn on the filter pump.
9. Turn the rotary switch to either SPA or POOL.
Set the temperature control to the desired setting.
The ignition control automatically lights the
burner when the thermostat calls for heat.
10. Set the time clock, if one is installed.
3C-2. Shutdown
Complete shutdown instructions are as follows:
1. Set both temperature controls to the lowest
setting.
2. Turn the rotary switch on the control panel to
OFF.
3. Turn off all electrical power to the heater at the
main junction box.
4. Open the control compartment door and turn the
gas valve knob clockwise to OFF.
5. Turn external gas valve off.
3D. Water Chemistry
3D-1. Pools
The mineral content of swimming pool water
increases daily, due to natural evaporation and the
addition of sanitizing chemicals. If the mineral
concentration in the pool gets too high, the excess
minerals will deposit on the walls of the pool, in the
filter system, and in the heater tubes. It is important to
keep the pH factor of the pool water between 7.4 and
7.6. See Table 7 for guidelines on other chemical
measurements.
3D-2. Spas
The proper chemical balance in spa water is more
critical than in a swimming pool heater operation. Due
to the spa's size, high water temperature, and heavy
usage, chemical values in a spa can vary greatly. This
chemical imbalance can result in unsanitary water
conditions, and affect the life of the heater.
3D-2a. Spa Water Chemistry
Maintaining safe water conditions in a spa can
only be done by regular water changes and the proper
addition of sanitizing chemicals. Kits are available
from your local pool supply dealer for making the
various tests for mineral content. One of these kits will
detect copper in the system. This is usually a warning
that corrosion is taking place, possibly due to a low pH
value combined with other chemistry problems. The
condition can be corrected by changing the spa water
and closely monitoring the pH factor and chemical
properties of the water (see Table 7).
Test Recommended
Level*
Free Chlorine or 1.0 to 3.0 ppm
Total Bromine 2.0 to 4.0 ppm
pH 7.2 to 7.6
Total Alkalinity (TA) 100 to 150 ppm
Calcium Hardness (CH) 200 to 400 ppm
Langelier Saturation Index (SI) -0.5 to +0.5
Cyanuric Acid 30 to 150 ppm
Total Dissolved Solids (TDS) Less than 1500 ppm
Copper 0 ppm
*As recommended by IPSA
Table 7. Chemical concentration levels.
3D-2b. Water Changing
Teledyne Laars recommends changing of spa
water every 60 days if usage is light and every 30 days
during heavy usage. Be sure to stabilize the water
chemistry after every water change.
Figure 26. Gas Valve.
GAS CONTROL
KNOB SHOWN
IN “ON” POSITION