2J-2. Start-up

Page 16

CAUTION

Do not operate this heater outdoors at temperatures below 20 degrees Fahrenheit (°F) (-7 degrees Celsius [°C]).

Confirm that pool water is flowing normally through the pool system and equipment. Start the heater in accordance with the Operating Instructions section of this manual, with particular attention to the lighting and shutdown instructions and temperature control operation.

The heater may not start on the first try. Air in the gas line or other start-up situations may cause it to recycle. It will lock out if ignition is not achieved in three attempts. On the LX model heater, to provide three additional attempts, press and release the mode button until the indicator on the LCD screen aligns with "OFF". Now press and release the button again until the indicator on the LCD screen aligns with the desired setting, either "POOL" or "SPA".

To reset the cycle on the model LT press and release the mode button until the indicator lights for the "SPA" and "POOL" settings are off. Then press and release it again until the indicator light for the desired setting is back on..

When the heater starts, immediately feel the outlet header of the heater to confirm that there is adequate water flow. The header should not be hot. Normally, water temperature will rise only a few degrees as it passes through the heater, and a “hot” header or pipe indicates low water flow.

side of the valve. The pressure will be zero when the heater is not running. When the heater is operating the manifold gas pressure should be 4.0" wc for natural gas and 9.0" wc for LP within .2" wc. To adjust the manifold gas pressure, first remove the slotted cap next to the inlet pressure port on the inlet side of the gas valve. Under the slotted cap is a slotted plastic screw which increases the manifold pressure when turned clockwise and decreases the manifold pressure when turned counterclockwise. After measurements, and adjustments if necessary, have been made, make sure to replace the 1/8" NPT gas valve plugs on the inlet and manifold pressure ports, and the cap on the manifold pressure adjustment screw. It is extremely important to replace these parts before leaving the installation. Failure to do so can result in damage to property or injury or death. With the heater firing, the pressure must be within the range shown in Table 7. Also check the pressure with the heater off.

Table 7. Gas Supply Pressure Requirements

Supply Pressure	Minimum	Maximum

Natural Gas	6.0 Inches WC	11.0 Inches WC
	(1.5 kPa)	(2.8 kPa)
LP Gas	10.5 Inches WC	14.0 Inches WC
	(2.7 kPa)	(3.5 kPa)

Manifold Pressure	Nominal

Natural Gas	4.0 Inches WC (1.0 kPa)

LP Gas	9.0 Inches WC (2.3 kPa)

WARNING

When the heater is fired for the first time, the combustion chamber refractory binder material is driven out by the heat of the flame. White smoke and/or sharp odors may be emitted from the vent during this period. Do not inhale combustion product fumes at any time, and especially when these fumes are being emitted. This “burn-in” period will last only a few minutes.

2J-3. Gas Pressure

Confirm that gas supply pressure is correct. If the gas supply pressure is less than required, check for undersized pipe between the meter and the heater, a restrictive fitting, or an undersized gas meter. Gas supply pressures to the heater, when it is operating, are listed in Table 7.

The manifold pressure may be checked by connecting a manometer to the pressure port on the outlet

2J-4. Adjustment of Water Pressure Switch

If the heater is installed in line with a two speed pump, the pressure switch MUST be adjusted to prevent the heater from firing on low-speed or low-flow pump operation. The pressure switch is preset at the factory for normal pool installations. Do not adjust it unless the heater's water connections are more than three feet above or below the pool surface. If they are not in this range, the pressure switch must be adjusted. This can be done in the field if the water connections are no more than six feet above the pool surface or no more than ten feet below it. For other situations, contact a Waterpik Technologies representative.

WARNING

The pressure switch should be adjusted to turn the heater off when the pump is off. Setting the switch to close at too low of a flow can damage the appliance.