Section IV. Operation

22

SAFETY CONTROLS

 

 

Figure 21.

VACUUM AIR PRESSURE (FAN)

 

SWITCH

 

The air pressure switch, (see Figure 21), 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 pressures 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.

 

 

AIR PRESSURE SWITCH

WATER PRESSURE SWITCH

Air Pressure Switch

 

The water pressure switch, (see Figure 22), closes when there is a sufficient flow of water to the heat exchanger to safely operate the heater. The switch has been preset by the Factory at 1½ PSI for operation. NOTE: See, Below Pool Level Installation instructions on page 8. The switch may remain closed with no water flow if there is more than a 3 ft. elevation difference between the heater (heat exchanger) and the pool water line—if this is the case, the water pressure switch must be reset by a qualified service technician to maintain open switch contacts with no water flow.

NOTE

If the pool is more than one floor above or one floor below the heater, the water pressure switch may have to be replaced with a flow switch.

Figure 22.

Adjustment Knob

Typical Water Pressure Switch

THERMAL FUSE

This is a single-use switch, mounted on combustion chamber jacket divider (inner front panel). The fuse, (see Figure 23), is activated by excessive temperature due to abnormal operating conditions. Upon detection of excessive heat within the inner front panel, the fuse will open the safety circuit causing shutdown of the heater.

Figure 23.

Thermal Fuse

P/N 472235

Rev. E 4-15-05

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Pentair NT Series installation manual Safety Controls, Vacuum AIR Pressure FAN Switch, Water Pressure Switch, Thermal Fuse
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NT Series specifications

Pentair is a renowned name in the realm of water filtration and fluid management solutions, and the NT Series stands out as a key player in their extensive product lineup. Engineered for optimal performance and reliability, the NT Series showcases innovative features and technologies that cater to various water treatment needs.

One of the defining characteristics of the Pentair NT Series is its exceptional filtration capabilities. These filters are designed to effectively remove sediments, chlorine taste and odor, and other contaminants, ensuring clean and safe drinking water. With a multi-stage filtration process, the NT Series utilizes advanced materials and technologies that enhance filtration efficiency and longevity.

The NT Series is equipped with advanced filter media that can capture particles as small as 0.5 microns. This level of filtration is essential for households and commercial applications, where water quality is paramount. The filters are also designed for easy replacement, ensuring minimal downtime and ease of maintenance for users.

Another prominent feature of the NT Series is its compact design, making it suitable for various installation spaces. The filters are engineered to maximize flow rate while maintaining high filtration efficiency, ensuring that users do not experience reduced water pressure. This balance of performance and design is integral, especially in demanding applications.

Moreover, the NT Series incorporates innovative technology to monitor filter life and performance. Several models come with built-in sensors that provide real-time data on filter conditions, allowing users to know when it's time for a replacement. This proactive approach to maintenance enhances user experience and ensures continued access to high-quality water.

The materials used in the NT Series are also noteworthy. Constructed from durable, corrosion-resistant components, these filters are designed to withstand harsh operating conditions while maintaining peak performance over time. This enhances the overall lifespan of the product, providing users with a reliable and long-lasting solution for their water filtration needs.

In summary, the Pentair NT Series represents a blend of advanced filtration technology, user-friendly design, and durable construction. With its ability to remove various contaminants, easy maintenance features, and compact design, the NT Series caters to residential and commercial users alike. Investing in the NT Series ensures access to clean, great-tasting water while enjoying the benefits of reliable and efficient filtration technology.
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