4D. Combustion Air Filter

Page 22

5.Igniter - The hot surface igniter is a ceramic element which becomes very hot when electrical power is applied to it. It functions both as an igniter and as flame sensor. As a sensor, it is the electrode through which the ignition control detects “rectification” of current passed through the flame. Inadequate rectification indicates an unsatisfactory flame condition. The ignition control responds to the flame signal provided by the ignitor.

6.Venturi Pressure Switch - This switch verifies that air is flowing through the combustion system by sensing pressure reduction at the venturi throat (relative to pressure at the venturi inlet). It shuts off the heater if air flow is inadequate.

7.Limit Switches - Two limit switches prevent excessive water temperature - one within the heat exchanger and one for water leaving the heater. If either senses excessive temperature, burner operation is interrupted.

8.Water Pressure Switch - This control senses whether or not water is available to the heater by measuring back pressure inside of the heat exchanger. If the pool water pump fails or the water filter is blocked, the pressure switch prevents operation of the burner. It can be affected by the installation conditions as discussed earlier in this manual.

9.Burner Temperature Limit Switch - This is a single-use switch which detects abnormal burner temperature. It is a disc-type switch which is held against the burner plenum by a sheet metal bracket. It has the appearance of an automatic-reset switch in that it has no reset button. However, it will reset only if cooled to -31oF, and therefore will not recycle. The burner limit switch prevents or interrupts burner operation if the burner plenum becomes too hot.

10.Vent Limit Switch - The vent limit switch protects the vent system from excessive exhaust temperature. It is located on the vent diffuser above the combustion blower. It interrupts burner operation if temperature becomes too hot for the plastic materials used to vent the heater.

See the earlier section entitled Start-up and Adjustment for the normal sequence of operation.

The combustion air filter is a rectangular foam filter located in a box near the bottom of the control compartment.. The filter removes lint and large scale dust particles to prevent blockage of the burner media.

Filter

Figure 30. Air Filter Replacement.

The filter should be replaced annually in normal service. Heavy use of the heater or operation in adverse environments may dictate more frequent replacement, however. It can be removed through the bottom of the filter box as illustrated in Figure 30.

Remove the wing nuts retaining the bottom panel and remove the panel. Grasp the bottom edge of the filter and pull it downward and to the right. Replace it only with the specified part available from a Teledyne Laars representative. Push the replacement filter into the tracks at the front and rear of the filter box.

4E. Electrical Trouble Shooting

This section describes procedures for checking the electrical power and control components of the heater one at a time and in the order they appear in the control circuit.

These procedures require a Volt-Ohm meter with 0-150 VAC VAC range, and 0-1000 Ohm resistance range. Figure 31 shows the power and control circuits, and where to take measurements. Location numbers in circles have been added, and will be referenced in the following sections.

As stated at the beginning of this manual, some of these procedures are hazardous. Only a qualified service technician should service the heater.

4E-1. 115V Electrical Power Supply

The electrical components of the Hi-E2 pool heater are designed to operate with supply voltage ranging from 103V to 126V at 60 Hz. Measure supply voltage at the “hot” and “neutral” wirenut connections in the heater electrical junction box (identified as points A and B on the wiring diagram). If no voltage is present, correct this external to the heater. Circuit breakers, time clock settings or similar devices may be the problem. Voltage outside of the above range may be due to poor wiring, poor connections, other loads