Safety Controls; Water Pressure Switch - Pentair MASTERTEMP 125 Guide D'installation Et D'utilisation

Section 4. Operation Instructions
34

SAFETY CONTROLS

AIR FLOW SWITCH (AFS)
The air flow switch, (see Figure
air blower (fan) is operating and has been designed to monitor the vacuum (negative)
pressure within the blower housing. The air flow switch is factory set and is connected
upstream of the ignition module. The ignition module does not operate unless the air
pressure switch and all safety switches are closed.

WATER PRESSURE SWITCH

Hazardous pressure. Do not bypass the Water Pressure Switch or render
it inoperable.
The water pressure switch, (see
water pressure switch may prevent the burner from firing and cause the "Service
System" light to go on. If the light remains on after the filter has been serviced,
have a qualified service technician check the system.
For deck-level heater installations, the Water Pressure Switch is factory set at
3.00 psi (20.6 kPa). NOTE: See, Below Pool Level Installation instructions on
page 13. If the pressure switch is one feet (.3M) below or above the pool water
level, reset the switch so that it is open when the pump is off and closed when
the pump is running. Turn the star-wheel on the switch clockwise (
raise setting (heater below the pool) and counterclockwise (
setting (heater above the pool – see
NOTICE: When the heater is mounted more than five feet (1.5M) above
or four feet (1.2M) below the deck level, a Pressure
Switch is no longer adequate. A Flow Switch must be
installed instead.
NOTICE: Heater operation with incorrect Pressure
Switch setting may cause operation with no water flow.
Operation of the heater without sufficient water flow
may severely damage it.
HIGH LIMITS
A "High Limit", is a safety device that opens the
electrical circuit and shuts off the heater based on a water
temperature set point within the "High Limit Device".
®
The MasterTemp 125 heater contains two (2) high limit
devices which are located on the main inlet / outlet header.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
28), is a safety device used to insure that the combustion
WARNING
Figure 29). If the water flow is restricted, the
Figure 30
. Test the switch after resetting.
Figure 29.
Figure 28.
) to
) to lower the
Turn star wheel clockwise to raise
pressure set point if pressure switch is
more than 4 feet (1.2M) below water level
A reference scale is on
the back of pressure switch
Turn star wheel counterclockwise to lower
pressure set point if pressure switch is more
than 5 feet (1.5M) above water level
Air Flow Switch
Figure 29.
Water
Pressure
Switch
Star Wheel
Figure 30.
Rev. C 3/2019