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SAFETY CONTROLS
AIR FLOW SWITCH (AFS)
The air flow switch, (see Figure 2), is a safety device used to insure that the
combustion 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 inoper-
HAZARDOUS PRESSURE. DO NOT BYPASS THE WATER
able.
PRESSURE SWITCH OR RENDER IT INOPERABLE.
WATER PRESSURE SWITCH
The water pressure switch, (see Figure 3). If the water flow is restricted, the
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
0.2 bar (3.00 psi). NOTE: See, Below Pool Level Installation instructions on
page 10. If the pressure switch is .3M (1 ft.) 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
(
) to raise setting (heater below the pool) and counterclockwise
(
) to lower the setting (heater above the pool – see Figure 4. Test the
switch after resetting.NOTICE: When the heater is mounted more than 1.5M
(5 ft.) above or 1.2M (4 ft.) 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 and will void the warranty.
HIGH LIMIT SWITCH
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
series of heaters contains two (2) high limit
devices which are located on the main inlet /
outlet header (see page 41 item 6).
P/N 475106 Rev. D 1/2016
All manuals and user guides at all-guides.com
WARNING
Turn star wheel clockwise to raise
pressure set point if pressure switch is more
than 1.2 M (4 ft) below water level
Turn star wheel counterclockwise to lower
pressure set point if pressure switch is more
than 1.5 M (5 ft) above water level
Air Flow Switch
Water
Pressure
Switch
A reference scale is on
the back of pressure switch
™
MASTERTEMP
Pool and Spa Heater Installation and User's Guide
Section 1. Operations
Figure 2.
Figure 4.
1.2 M (4 ft)
Star Wheel
1.5 M (5 ft)
Figure 3.
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