ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
23
Safety Controls
Air Flow Switch (AFS)
There is an air flow switch (see
Figure 20
), designed as a safety device
to ensure the combustion air blower (fan) is operating and monitoring the
differential (negative) pressure within the blower housing. The air pressure
switch is factory set. The switch is connected upstream of the ignition
module. The ignition module does not operate unless the air flow switch and
all safety switches are closed.
Water Pressure Switch (WPS)
The heater has a Water Pressure switch, see
Figure 22
. If the water flow is restricted, the water
pressure switch may prevent the burner from firing
and cause the Service System LED indicator to go
on.
Note:
If the light remains on after the filter has been
serviced, have a qualified service technician check
the system.
For proper adjustment of the water pressure switch,
refer back to page 10,
Water Pressure Switch
Adjustment
. Turn the star-wheel on the switch
clockwise ( ) to raise setting (heater below
the pool level) and counterclockwise ( ) to
lower the setting (heater above the pool level), see
Figure 21
. Test the switch after resetting.
High Limit Switch (HLS) and Automatic Gas
Shut-off Switch (AGS)
A High Limit Switch (HLS), is a thermostat that opens the
electrical circuit and shuts off the heater based on a water
temperature set point within the HLS. Both the AGS and HLS
switches located in the outlet plumbing assembly
(see
Figure 22
).
Figure 20
Hazardous pressure. Do not bypass the
Water Pressure Switch or render it inoperable.
A reference scale is on
the back of pressure switch
Turn star wheel
clockwise
to
raise
pressure set point
Turn star wheel
counterclockwise
to
lower pressure set point
Water Pressure
Switch
Star Wheel
Figure 21
Heater operation with an incorrect water
pressure switch setting, may cause the heater
to operate without sufficient water flow, and may cause severe
heater damage.
Figure 22
ENGLISH
