Flame ROLL-OUT Safety Switch, High Limits

WATER PRESSURE SWITCH

The water pressure switch, or heater actuator, ensures that the heater operates only when the filter pump is in operation. It is located on the inlet/outlet header. It is factory set at 1.75 PSI for deck-level installations. When the heater is located below the level of the spa or pool, it may be necessary to adjust the pressure switch to compensate for the no-flow static head. If it is necessary to adjust the water pressure switch, uti- lize the following procedure:

WATER PRESSURE SWITCH ADJUSTMENT

FLAME ROLL-OUT SAFETY SWITCH

Atmospheric heaters are equipped with a thermal cut- off device to prevent flame roll-out in the event the heat exchanger becomes blocked. This is a "single- use" type fusible link or thermal fuse, that must be replaced when disabled by an over-temperature condi- tion, caused by excessive restriction in the heat exchanger flue passage.

Fig.# 9438

PRESSURE SWITCH ADJUSTMENT RANGE

1.With pump and heater on, turn adjustment knob clockwise until a click is heard from the gas valve.

2.Turn adjustment knob counter-clockwise 1/4 turn.

3.Turn pump off and on several times. Heater should shut off immedi- ately. If it does not, repeat the above steps.

MAY REQUIRE ADJUSTMENT

FOR LOWER PRESSURE

Fig.# 9440

HIGH LIMITS

The heater is equipped with two automatic high limits. Both are located in the inlet/outlet header. Both are set to open at 135°F.

NOTE: An erratic high limit is often characteristic of an internal heat exchanger problem, e.g. scale build-up, defective bypass. Refer to Troubleshooting section (on pg. 42).

HIGH LIMIT REMOVAL

5 FT.

MAY REQUIRE ADJUSTMENTMAX FOR HIGHER PRESSURE

5 FT.
MAX	POOL OR SPA

Fig.# 8152.3

NOTE: If heater is installed outside of the limits shown, a higher pressure rated (11 psi) switch may be used. A flow switch, mounted and wired adjacent to the heater, may be used in place of the factory-mounted pressure switch. See Parts List (pg. 51) for 11 psi water pressure switch.

TWO-SPEED PUMPS

In some cases, the flow on the low-speed is insufficient to operate the heater. This is apparent when the water pressure switch cannot be further adjusted or if the heater makes banging noises or shuts off on high limit. In these cases, the pump must be run at high speed when heating the water.

CAUTION: Do not operate the heater without the function of a properly adjusted water pressure switch or flow switch.

1.Shut off main elec- trical power switch to heater.

2.Remove inlet/outlet inspection panel.

3.Remove defective high limit and replace with a new high limit.

4. Replace inspection	Fig.# 9439
4. Replace inspection
panel.

PILOT SAFETY - Millivolt Models

Heaters equipped with the standing pilot (millivolt sys- tem) have pilot generators which act as a safety device to shut off the flow of gas to the main burners and the pilot burner in case the pilot flame is extin- guished. The pilot burner must be manually re-lighted to place the heater in operation again. Refer to the lighting instructions provided on the heater label.

PILOT SAFETY - Digital Models

The heater employs a pilot safety which closes the main gas valve within 8/10ths of a second whenever the pilot flame is interrupted. The pilot flame is auto- matically lit when the device is powered. The heater performs its own safety check and opens the main valve only after the pilot is proven to be lit.