DL
Design
Glanded double pump in in-line design with flange connection
Application
For pumping heating water (in accordance with VDI 2035), water-glycol mixtures and cooling and cold water without abrasive substances in heating, cold water and cooling water systems
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Type key |
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Example |
DL 40/1604/2 |
DL |
In-line double pump |
40 |
Nominal diameter DN of the pipe connection |
160 |
Nominal impeller diameter |
4 |
Rated motor power P2 in kW |
2 |
Number of poles |
Special features/product Advantages
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High-efficiency motors as standard; from 0.75 kW nominal motor power: motors with IE2 technology
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Reduced life cycle costs due to optimised efficiency
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Standard condensate drainage holes in the motor housings
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Can be used flexibly in air-conditioning and cooling systems, with application benefits due to direct draining of condensate via optimised lantern design (patented)
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High corrosion protection thanks to cataphoretic coating
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Bidirectional mechanical seal with forced flushing
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High worldwide availability of standard motors (according to Wilo specifications) and standard mechanical seals
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Reduction of space required and installation costs due to double pump design
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Main/standby mode or peak-load operation (by means of external auxiliary device)
- Peak-load operation (by means of external auxiliary device)
Technical Data
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Permissible temperature range -20 °C to +140 °C
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Mains connection 3~400 V, 50 Hz (others on request)
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Protection class IP 55
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Nominal diameter DN 32 to DN 200
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Max. operating pressure 16 bar
Description/Design
- Single-stage, low-pressure double pump in in-line design with
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Switchover valve
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Mechanical seal
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Flange connection with pressure measuring connection R 1/8
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Lantern
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Coupling
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IEC Standard motor
Materials
- Pump housing and lantern: Standard: EN-GJL-250
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Impeller: Standard: EN‐GJL‐200; Special version: Red brass G-CuSn 10
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Shaft: 1.4122
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Mechanical seal: AQEGG; other mechanical seals on request
Scope of delivery
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Pump
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Installation and operating instructions
Options
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L1 variant with red brass impeller (at additional charge)
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Motors with efficiency class IE3, other voltages and frequencies, as well as ATEX approval on request
Accessories
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Brackets for installation on a base
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PTC thermistor sensors, PTC resistor tripping relays, special motors
- Special mechanical seals
- Control systems CR, CRn, CC-HVAC, VR-HVAC and switchgears
General notes - ErP (ecological design-) directive
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The benchmark for most efficient water pumps is MEI ≥ 0.70
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The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
- The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
- Information on benchmark efficiency is available at www.europump.org/efficiencycharts