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then the ignitor will glow and the gas valve will energize. The water temperature and flue temperature will increase as gas combustion takes place.
The heater will attempt to ignite three times in succession. If, after three attempts for ignition, the heater does not sense the presence of flame, the heater goes into a ‘lockout’ mode and must be reset to fire. This can be done on both model heaters by pressing and releasing the mode button so that the heater is turned off and then returned to the desired mode.
If the heater cannot fire, a diagnostic message is displayed on the left side of the Model LX LCD screen on the control panel, or by a lighted indicator on the Model LT control panel. Review the potential causes listed on the opposite page for the code on the display. The unit may require service from a qualified professional serviceman. Contact Waterpik Technologies for your nearest qualified service organization. Be sure to note the serial number and model number before calling. The address of Waterpik Technologies is displayed on the rear cover of this manual.
8.Set the heater controls to the "SPA" position (mode). If the temperature of the water exceeds the thermostat setting it is necessary to increase the thermostat setting to exceed the water temperature. Adjust the thermostat setting to be greater than the water temperature (desired temperature). The ignitor lights the burner when the thermostat calls for heat.
9.Set the time clock, if one is installed.
3C-2. Shutdown
Complete shutdown instructions are as follows:
1.Set both temperature controls to their lowest setting.
2.Press and release the mode button until the indicators show that the heater is off.
3.Turn off all electrical power to the heater at the junction box.
4.Open the heater door and turn the gas valve knob clockwise to off.
IMPORTANT: The temperature controls cannot be calibrated in the field. If the temperature control does not work, shut down the heater and replace the temperature control. DO NOT rely on temperature control to shut the heater off. Remove the heater door and turn the main gas valve to OFF.
3C. Lighting and Shutdown
3C-1. Lighting the Heater
WARNING
Do not attempt to light the heater with the door off. Doing so may cause severe bodily injury.
Lighting and shutdown instructions are listed on the label attached to the inside of the heater door and on the following page. Lighting instructions are as follows:
1.Turn off all electrical power to the heater at the main junction box.
2.Remove the heater door and turn the heater gas valve to off.
3.Wait 5 minutes before trying to start the heater.
4.Turn the gas valve control knob counterclockwise to ON (see Figure 22.)
5.Replace the heater door.
6.Turn on electrical power to the heater.
7.Turn on the filter pump.
5.Shut off the external gas supply valve to the heater.
3D. Water Chemistry
Caution
All
Do not put any chemicals into the filter skimmer or intake. Concentrated chemicals can damage the heat exchanger and will void the manufacturer's warranty.
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 7.2 and 7.6. See Table 6 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.
