Description
The Pentair Nocchi DHI 4-50M (code 422-0450) is a horizontal multistage centrifugal pump in AISI 316 stainless steel, for 230v single-phase supply. It delivers up to 120 litres per minute, with 44 metres of head at 40 l/min and 23 metres at 120 l/min, from a 0.90 kW motor drawing 5.8 A. Suction and delivery are 1¼”. The pump weighs 14.0 kg and is 422 mm long.
The 4-50 is the largest DHI, combining the highest flow in the range with the strongest head in the DHI 4 family: 44 metres at 40 l/min, 36 metres at 80 l/min and 23 metres at 120 l/min. It is the pump to choose for a booster set where both demand and building height are higher. The DHI 4-40M is the next size down, and if your demand stays below 60 l/min the DHI 2-70M gives more head at low flow. The DHI 4-50T is the 400v three-phase version.
The pump body, impellers and shaft are AISI 316 stainless steel, the motor housing is die-cast aluminium, and the mechanical seal is carbon on ceramic with EPDM gaskets. The 2-pole motor runs at 2850 rpm, is IP55 rated and has Class F insulation. Suction and delivery are both 1¼” threaded connections, set at 90 degrees to each other. The pump is supplied as a bare pump and motor, without a pressure switch, vessel or controller.
Features
- Largest DHI: 0.90 kW motor, 422 mm long, 14 kg
- 44 m at 40 l/min, 36 m at 80 l/min, up to 120 l/min
- 230v single-phase motor, 5.8 A
- AISI 316 stainless steel pump body, impellers and shaft
- Rated for clean water up to 90°C
- IP55 motor with Class F insulation, 2850 rpm
- 1¼” suction and delivery at 90 degrees
Applications
- Booster sets for larger commercial and multi-storey buildings
- Irrigation and washing systems at higher flow
- Hot water circulation up to 90°C
Performance
| Flow (l/min) | 40 | 50 | 60 | 80 | 100 | 120 |
|---|---|---|---|---|---|---|
| Head (m) | 44 | 42 | 40 | 36 | 30 | 23 |
The DHI is for clean water without suspended solids or abrasive material, up to 90°C, with a maximum operating pressure of 6 bar at 90°C. It is not self-priming: fill the casing and suction pipe before starting, and never run it dry. On 230v single-phase, connect it through a suitable isolator with fuses and motor protection, as Pentair’s manual requires. For drinking water boosting in the UK, draw from a break tank or cistern rather than connecting straight to the mains supply pipe without your water supplier’s consent.
The Nocchi DHI range
| Model | Supply | Motor output P2 (kW) | Current (A) | Head at 40 l/min (m) | Highest listed head (m) | Max flow (l/min) |
|---|---|---|---|---|---|---|
| DHI 2-40M | 230v single-phase | 0.40 | 3.2 | 27 | 36 | 60 |
| DHI 2-60M | 230v single-phase | 0.60 | 4.1 | 37 | 53 | 60 |
| DHI 2-70M | 230v single-phase | 0.78 | 5.2 | 44 | 63 | 60 |
| DHI 4-30M | 230v single-phase | 0.50 | 3.6 | 27 | 27 | 120 |
| DHI 4-40M | 230v single-phase | 0.70 | 4.4 | 35 | 35 | 120 |
| DHI 4-50M | 230v single-phase | 0.90 | 5.8 | 44 | 44 | 120 |
| DHI 2-40T | 400v three-phase | 0.40 | 1.4 | 27 | 36 | 60 |
| DHI 2-60T | 400v three-phase | 0.60 | 1.8 | 37 | 53 | 60 |
| DHI 2-70T | 400v three-phase | 0.78 | 1.8 | 44 | 63 | 60 |
| DHI 4-30T | 400v three-phase | 0.50 | 1.7 | 27 | 27 | 120 |
| DHI 4-40T | 400v three-phase | 0.70 | 2.0 | 35 | 35 | 120 |
| DHI 4-50T | 400v three-phase | 0.90 | 2.0 | 44 | 44 | 120 |
Figures are from Pentair’s DHI datasheet. See the Nocchi DHI multistage pump range page for help choosing between models and answers to common questions.
Reviews
There are no reviews yet.