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Product code: NMTD MAX

North Ridge NMTD MAX Series Energy Saving Inline Twin Circulating Pumps

Pump Type - Circulator

Max Flow Rate M³H - 72.7 M³H

Max Head - 18.9M

Pump Materials - Cast Iron

Max Temp - 110°C

Max Viscosity - 100 cst

Max Solid Passage - 0mm

Self Priming - N

Inlet/Outlet Sizes - 38mm to 100mm

Drive - AC Electric

Max Suction Lift - 0

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DESCRIPTION

NMTD MAX Series Energy Saving Inline Twin Circulating Pumps

Flow Rate	Up to 72.7m³/hr
Head (Pressure)	Up to 18.9m
Inlet/Outlet Sizes	1 1/2” to 4”
Operating Temperature	-10°C to +110°C
Drive Options	Electric Motor

The NMTD MAX series of high efficiency inline twin circulating pumps are designed for applications involving hot and cold water, these include industrial and civil heating systems, air conditioning, HVAC and closed-circuit cooling.

Pumped fluids must be clean, free of oils, contain no solids and be non-flammable. Compatible fluids include; hot water, cold water and water and glycol mixtures (check compatibility with glycol concentrations over 20%). The acceptable fluid temperature range is between -10°C and 110°C, the ambient environmental temperature must not exceed 40°C.

The NMTD MAX range is fitted with a cutting-edge high efficiency motor that reduces energy consumption during operation.

The control module has 5 easily selected modes depending on system requirements, these are:

Automatic mode – The pump automatically selects the operating pressures depending on the system. This is the recommended operating mode for most systems as the pump finds the optimum operating pressure.

Proportional pressure – The pump will maintain pressure depending on the required flow rate.

Constant pressure – The pump will maintain the pre-set pressure.

Constant speed – The pump will maintain the pre-set speed (RPM).

Night mode – Night mode can be used in conjunction with any of the above modes. The pump will reduce flow, pressure and power consumption when it detects that the liquid temperature has decreased by 15-20°C. The pump will automatically return to normal operating model when the temperature rises.

Additionally, the NMTD MAX series can be fitted with a communication module for remote control (NMTD MAX C version).

The communication module allows for various remote-control features, including:

• Remote On/Off

• Analogue 0-10V voltage control

• MODBUS remote control

• Status relay feedback

• Web access via Ethernet

Standard materials are:

Pump casing - Cast iron

Impeller - PES

Shaft - Stainless steel AISI 316

Bearings - Graphite

Rotor can - Stainless steel AISI 316

This range is also available with a single cast iron pump (NMT MAX range).

This range is also available with a single bronze pump casing for hot water sanitary applications (NMT SAN MAX range).

Additional product details:

· ECM permanent magnet technology for high energy efficiency

· LED control display

· Flanged connections

· Built-in motor protection

· Quiet operation

· Automatic air venting

· Compact and robust

· 230V Single Phase, 400V Three Phase 50Hz or 60Hz motors

· IP44

FAQS

How do I know what size circulating pump is best for my system?

The standard information such as fluid, flow rate, head/pressure, power supply and required control features are important when selecting a circulating pump. However, it is also important to know the flange to flange dimensions of the existing pump. If it is a new application, then the available space will be required.

Can this pump run dry?

No, definitely not! Centrifugal pumps will incur damage even after short periods of dry running. The mechanical seal will be destroyed, and this will cause the pump to leak. There is also the possibility that the motor will burn out. Our advice is to ensure that the pump has a flooded suction or always make sure that the pump casing and inlet pipe are filled with water; one way of ensuring this is to fit a check valve on the inlet line to stop water escaping when the pump is inactive. Another way of protecting the pump is to fit a dry running device, this will turn the pump off if it detects that that no fluid is entering the pump. If you think that dry running is inevitable, then please speak to us and we will try to select a more suitable pump for your application.

How do I know what pump materials are correct for my application?

Firstly, always check the compatibility of the materials available against the fluid being pumped. The main materials to check are the pump casing, impeller, o-ring and mechanical seal. It may be that more than one material is suitable for your fluid and selection could be based on the application type. For instance; cast iron, bronze and stainless steel are all suitable for fresh water. If it is a simple transfer application, then the most cost-effective material cast iron will be best. However, if it is a sanitary application, then stainless steel or bronze are better choices.

What is NPSH and why is it so important?

NPSH is an acronym for Net Positive Suction Head. NPSH measures the absolute pressure present in a fluid.

There are two main ways that NPSH is expressed in a pump system

NPSHa - This is the amount of Net Positive Suction Head available at the pump inlet. NPSHa demonstrates the amount of pressure acting on a fluid as it enters the pump. This measures the amount of pressure between the liquid staying in its current state and forming vapour bubbles (beginning to boil).

NPSHr - This is the amount of Net Positive Suction Head that the pump requires to operate without experiencing the damaging effect of cavitation, thus causing a dramatic reduction in pump performance.

It is very important to pay attention to these values when making a pump selection. Selecting a pump that requires more NPSH than is available in your system will cause fast and long-lasting damage to the pump and thus you will incur large repair costs and downtime.

What does the term best efficiency point (BEP) mean and why is it so important?

The best efficiency point or BEP is a point along the pump performance curve that indicates where efficiency for the pump peaks. When selecting a pump, you must try and get as close to the BEP as possible to ensure that the pump is at maximum efficiency when operating. The closer to the BEP the pump is when operating, the lower the energy costs will be, thus saving significant amounts of money during the pump’s lifetime. Also, vibrations will be at their lowest meaning maintenance costs are lower and the lifespan of the pump is maximised. It is very important to pay attention to the BEP when your pump is selected, as an oversized or undersized pump could cost you significant amounts of money.

Is this pump available in multi speed and what control features are available?

Control features vary by model. The main control features that are available include:

Automatic mode – The pump automatically selects the operating pressures depending on the system. This is the recommended operating mode for most systems as the pump finds the optimum operating pressure.

Proportional pressure – The pump will maintain pressure depending on the required flow rate.

Constant pressure – The pump will maintain the pre-set pressure.

Constant speed – The pump will maintain the pre-set speed (RPM).

Night mode – Night mode can be used in conjunction with any of the above modes. The pump will reduce flow, pressure and power consumption when it detects that the liquid temperature has decreased by 15-20°C. The pump will automatically return to normal operating model when the temperature rises.

Additionally, some models can be fitted with a communication module for remote control. The communication module allows for various remote-control features, including:

Remote On/Off

Analogue 0-10V voltage control

MODBUS remote control

Status relay feedback

Web access via Ethernet

What is automatic air venting?

On initial startup and commissioning, circulator pumps need venting of air which is normally performed by opening a drain plug on the casing, allowing it to escape. The pump is then ran to circulate any air within the system, with the port opened at intervals to siphon air as it travels through the system. This is usually a manual process taking several minutes.
Automatic air venting means the pump automatically eliminates the air, without intervention during commissioning.

What is ECM Permanent magnet technology?

Typically motors have internal windings, manufactured from copper coil in which electricity flows creating a magnet. Permanent magnet designs of motor mean that the motor parts are already magnetized improving efficiency.
Such designs allow the motor to maintain efficiency across a wide range of operating speeds which is controlled via a microprocessor. This increases the efficiency of the motor, allows more precise operation and control of the motor which is required for automatic operation where the units adapts according to required flows and pressures. This technology also reduces the overall weight of the unit.