booster set controller
For 5–10 floors, booster sets, PM821-16 is the right choice: pump current 8 – 16 A, pump power up to 3 kW.
Who is this page for?
For 5–10 floors, booster sets, PM821-16 is the right choice: pump current 8 – 16 A, pump power up to 3 kW.
Model selection guide
| Pump current | Pump power | Model | Typical use |
|---|---|---|---|
| up to 8 A | up to 1.5 kW | PM821-8 | 1–4 floors, homes and shops |
| 8 – 16 A | up to 3 kW | PM821-16 | 5–10 floors, booster sets |
| up to 25 A | up to 4 hp | PM821-25 | Residential, commercial and agricultural |
The current on the pump nameplate decides the model, nothing else.
How it works
- The pressure sensor measures the line pressure continuously.
- When the pressure falls to the F2 value, the unit soft-starts the pump.
- When the pressure reaches the F1 value, the unit soft-stops the pump.
- If the pump current rises above F3, or no water arrives, the unit stops the pump and shows a fault code.
Technical specifications
| Property | PM821-8 | PM821-16 | Unit |
|---|---|---|---|
| Maximum pump current | 8 | 16 | A |
| Maximum pump power | 1.5 | 3 | kW |
| Peak starting current | 10 | 30 | A |
| Supplied sensor pressure range | 0 – 20 | 0 – 20 | bar |
| Pressure sensor thread | G1/4 | G1/4 | female |
| Input voltage | 180 – 240 | 180 – 240 | V |
| Output voltage | — | — | equal to input |
| Unit's own consumption | < 5 | < 5 | W |
| Operating temperature | -15 – 55 | -15 – 55 | °C |
| Weight, boxed | 650 | 650 | g |
These figures come from the HYDROSET PM821 user manual (hardware A3.3, software 4.0). The manual covers PM821-8 and PM821-16 only, so no column is shown for PM821-25.
Price and ordering
The price of PM821-8 and PM821-16 is on each product page. PM821-25 is made to order and has no published price; contact the company for it.
Frequently asked questions
Recommended model
For 5–10 floors, booster sets, PM821-16 is the right choice: pump current 8 – 16 A, pump power up to 3 kW.
What if the pump nameplate current is unreadable?
Tell the company the number of floors and units and a model will be suggested. The model selection guide also carries a floors-to-model table.
What happens if the pump is stronger than the model's rating?
The unit raises fault E1 (over current) and stops the pump. Always pick a model rated at or above the pump's nameplate current.
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