Hermetic refrigarant pump for CO2 up to 63 bar

NRP
NRP

The WITT NRP design can count on more than two decades of experience with the natural refrigerant CO2 (R744). The NRP provides reliable operation suitable up to 63 bar standstill pressure.

Possible replacement of almost any refrigerant pump
You decide on the arrangement of the connection nozzles to suit the situation on site; so you can easily replace other refrigerant pump brands when needed.

Excellent overall efficiency
The new hydraulic design and no need for a motor can improves efficiency. Almost the entire volume flow is available for your system, as the NRP requires only a very small motor cooling line. No additional QMIN- and/or overflow line is needed. The wide permitted frequency range between 20 Hz and 60 Hz allows you to operate the NRP constantly at the optimum operating point.

Easiest assembly
A standard support bracket installed at the pump's balance point facilitates installation and the optimised design of the NRP allows easy insulation.

Maintenance free design
As a wet rotor pump, the NRP is less sensitive than canned pumps to refrigeration oils, gaseous refrigerants and sudden pressure drops. If the system should nevertheless require service, the entire inner part of the pump
can be removed from the housing, so the housing can remain in the system.

WITT NRP Animation
NRP
NRP
NRP
NRP
NRP 2 Modelle
NRP 2 Modelle

Capacity data

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NRP Delivery head* max. [m] Pump capacity* max. [m³/h] Power max (A) Motor capacity [kW]
W 1/5-5040 50 Hz 400 V 18,0 13,0 3,8 2,3
60 Hz 400 V 26,5 16,0 6,0 3,6
W 2/5-5040 50 Hz 400 V 36,5 13,0 4,3 2,6
60 Hz 400 V 53,0 16,0 8,0 4,8
W 3/5-5040 50 Hz 400 V 55,0 13,0 5,0 3,0
60 Hz 400 V 79,0 16,0 8,0 4,8
W 4/5-5040 50 Hz 400 V 73,0 13,0 5,7 3,4
60 Hz 400 V 105,0 16,0 9,5 5,7
W 1/12-8050 50 Hz 400 V 18,0 30,0 5,0 3,0
60 Hz 400 V 26,5 35,0 12,5 7,5
W 2/12-8050 60 Hz 400 V 36,5 30,0 7,0 4,2
60 Hz 400 V 53,0 35,0 12,5 7,5
W 3/12-8050 60 Hz 400 V 55,0 30,0 10,0 6,0
60 Hz 400 V 79,0 35,0 17,0 10.2
W 4/12-8050 60 Hz 400 V 73,0 30,0 12,5 7,4
60 Hz 400 V 105,0 35,0 21,5 13,0

* 50 / 60 Hz at 2900 / 3600 1/min


Length [mm] Diameter [mm] Suction connection Ø [DN] Pressure connection Ø [DN] Weight** [kg] min. Ø Inflow [DN]
W 1/5-5040 706 219,1 50 40 93 100
W 2/5-5040 706 219,1 50 40 95 100
W 3/5-5040 706 219,1 50 40 97 100
W 4/5-5040 706 219,1 50 40 99 100
W 1/12-8050 811 219,1 80 50 103 150
W 2/12-8050 811 219,1 80 50 104 150
W 3/12-8050 811 219,1 80 50 106 150
W 4/12-8050 811 219,1 80 50 107 150

** with EA + ERA


Wide field of performance: 2 models with up to 4 stages
Choose between the models NRP-W x/5 and NRP-W x/12, each with 1 to 4 stages. .

2 models
2 models

Delivery height:
up to 75 m at 50 Hz
up to 115 m at 60 Hz

Frequency control:
20 to 60 Hz

Operating temperature:
–50 °C to +20 °C

Motor power:
2 kW and 4 kW

Volume flow net *:
up to 29 m³/h at 50 Hz
up to 35 m³/h at 60 Hz

Ambient temperature:
–10 °C to +50 °C

Connections:
WITT round flanges,
others on request

Conformity:
PED and CE

* The motor cooling volume flow is already extracted.

Accessories

  • GF Counter flange PN40 or PN63
  • EA stop valve - suctionside PN40 or PN63
  • ERA pressure-side stop/check valve PN40 or PN63

Are you interested in an NRP hermetic refrigerant pump?

Just use our easy contact form.

We then select the perfect model for you.

Of course, you can select our selection program “WITT Select.