Teledyne EHE warranty SECTION Operating Instructions, 2L-6.Water Temperature Rise

Hi-E2 Page 15

To adjust the pressure switch, proceed as follows (see Figure 23).

The pool filter must be clean before making this adjustment. The heater does not have to be firing.

1.Turn the Flex Temp switch to OFF, and make sure the pressure switch is at its lowest setting. This is done by rotating the adjuster counterclockwise as far as it will go.

2.Start the filter pump and confirm by means of an ohmmeter that the pressure switch closes (if the switch fails to close, replace it with a switch which has a lower minimum setting).

3.Turn Flex Temp switch to ON. Heater should start.

4.Pry out the top rubber dirt plug.

5.Use a 7/32 inch Allen wrench to turn the adjustment screw very slowly clockwise until the heater goes off.

6.Slowly turn the pressure switch adjustment screw counter-clockwiseone-quarter turn. The heater should come back on

7.Check the adjustment by turning the filter pump OFF. The heater should shut off immediately. If it does not, restart the filter pump and repeat Steps 6 and 7. Check the adjustment again.

8.Return the pool temperature control to the desired temperature.

It may be necessary to repeat these steps to get a proper setting. The switch must be set so that the heater will not fire unless the pump is running. If a proper setting cannot be reached, contact the factory service department.

2L-6. Water Temperature Rise

The Hi-E2pool heater has an internal bypass device which accommodates a wide range of water flow. Its purpose is to assure that flow through the heat exchanger is adequate to provide high efficiency operation and prevent overheating even though flow through the filter system may vary.

Correct water flow should be confirmed upon start-up of the heater and in most servicing situations. If flow is not normal, corrections must be made to the pool system. If the system has an external flow bypass (because of very high filter system flow), it should be adjusted to provide proper flow through the heater. Flow is evaluated by determining the water temperature rise through the heat exchanger.

Before checking temperature rise, be sure the pool filter is clean. If necessary, clean the filter.

Temperature rise is measured at the return header, which is on the side opposite to the inlet/outlet header. For access, remove the side cover, which is held in place by wing nut fasteners inside the heater. Remove the brass plug on the top surface of the header and install a pocket thermometer (see Figure 24).

Proceed as follows:

1.If the piping system has a manual bypass valve, close it.

2.Turn off the heater by moving the Flex Temp switch on the temperature control panel to “Off”.

3.After three minutes, note and record the thermometer reading. This is the pool temperature.

4.Start the heater and let it operate for at least five minutes. Note and record the thermometer reading. The difference between this reading and the first one is the temperature rise.

5.If the piping system has a manual bypass valve, gradually open it until the temperature rise is in the range required by Table 6.

6.Scribe a line on the bypass valve shaft and case to mark the correct adjustment position. Wire the handle to the pipe to prevent tampering.

Note that temperature rise is somewhat less when the water is hot (spa application) and when heater is installed at elevations significantly above sea level. For high elevation installations, reduce the numbers in Table 6 by 3% per 1000 feet above sea level.

	Minimum	Maximum	Minimum System
Model	Temp Rise,	Temp Rise,	Flow
	°F (C)	°F (C)	GPM
220	12 (6.5)	17 (9.5)	30
350	20 (11)	29 (16)	30

Table 6. Water Temperature Rise and Flow Rates (Measured at Return Header)

In a system without external bypass, it may be necessary to make changes. If temperature rise is too low, a manual bypass must be installed. If temperature rise is too high, there is inadequate flow, possibly requiring a change to the piping system or a larger pump. Before proceeding with either remedy, verify proper heater operation. Low gas input results in low temperature rise and vice-versa. A problem with the heater internal bypass assembly also affects measured temperature rise.

SECTION 3.

Operating Instructions

Lighting and shutdown instructions are posted inside the heater.