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GAS CONTROL
KNOB SHOWN
IN “ON” POSITION
Figure 26. Gas Valve.
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) | |
Cyanuric Acid | 30 to 150 ppm |
Total Dissolved Solids (TDS) | Less than 1500 ppm |
Copper | 0 ppm |
*As recommended by IPSA |
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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.
