Grundfos DDA 7.5-16 FCM-C-PVC Dosing Pump
Spare Parts for DDA 7.5-16 FCM-C-PVC Dosing Pump
Product Summary
The Grundfos DDA 7.5-16 FCM-C-PVC is a high-precision Smart Digital S dosing pump featuring the advanced Flow Control Monitor (FCM) and AutoFlowAdapt technology. This intelligent pump detects air bubbles, overpressure, and valve leakage, automatically adjusting its stroke speed to maintain target flow. The "PVC" configuration features a Polyvinyl Chloride dosing head with Ceramic valve balls, ideal for dosing acids and alkalis in water treatment applications.
- Flow Control Monitor (FCM): Integrated sensor measures pressure and flow, detecting faults like air locks or burst discharge lines.
- AutoFlowAdapt: Automatically compensates for environmental changes (e.g., pressure fluctuations) to ensure precise dosing without manual recalibration.
- Turn-Down Ratio 1:3000: Allows for extremely smooth, continuous dosing down to 2.5 ml/h with internal stroke speed control.
- PVC Construction: Cost-effective chemical resistance for standard water treatment (Note: PVC derates max pressure to 10 bar).
- Digital Display: Backlit screen with click-wheel navigation provides mL/h readout, error codes, and simple setup.
Spare Parts List
| Select | Qty | Part Number | Description | Material / Spec |
|---|---|---|---|---|
| 1 | 97751630 | Service Kit (Valves + Diaphragm) | PVC / FKM / Ceramic | |
| 1 | 97751480 | Valve Kit (Suction & Discharge) | PVC / FKM / Ceramic | |
| 1 | 97751182 | Complete Head (FCM Sensor) | PVC / FKM / Ceramic | |
| 1 | 97751624 | Service Kit (Valves + Diaphragm) | PVC / EPDM / Ceramic | |
| 1 | 97751474 | Valve Kit (Suction & Discharge) | PVC / EPDM / Ceramic | |
| 1 | 97751176 | Complete Head (FCM Sensor) | PVC / EPDM / Ceramic | |
| 1 | 97751707 | Diaphragm Kit (D7.5-16) | PTFE Coated | |
| 1 | 97790989 | Deaeration Valve | PVC / FKM | |
| 1 | 97790988 | Deaeration Valve | PVC / EPDM | |
| 1 | 97790967 | Cover for Dosing Head | PP | |
| 1 | 97790957 | Wall Mounting Plate | Plastic | |
| 1 | 92836196 | Service Tool for FCM Sensor | Steel |
Exploded Parts Views
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model / Curve | DDA 7.5-16 FCM-C-PVC |
| Rated Power | 24 W (Max P1) |
| Voltage / Frequency | 1 x 100-240 V / 50-60 Hz |
| Rated Current | Max 0.8 A (Inrush 25A) |
| Discharge Connection | 4/6 mm, 6/9 mm, or 6/12 mm (Hose) |
| Impeller Type | PTFE Coated Diaphragm |
| Installation Type | Surface / Wall Mount (IP65) |
Troubleshooting, Common Faults & Solutions
Pump not running / No display
Likely Cause: No power supply or internal fuse blown.
Action / Part: Check 100-240V supply and cable integrity.
Pump runs but no liquid detected
Likely Cause: Air lock in head or suction line.
Action / Part: Open Deaeration Valve (97790989) or install valve kit (97751480).
Liquid leaking from drain hole
Likely Cause: Primary diaphragm rupture.
Action / Part: Replace Diaphragm (97751707) immediately.
FlowControl Alarm (Air Bubbles)
Likely Cause: Degassing chemical (e.g. Hypo) causing air lock.
Action / Part: Activate Auto-Deaeration mode or check suction line tightness.
Overpressure Alarm
Likely Cause: Blocked discharge line or closed injection point.
Action / Part: Clear blockage or check back-pressure valve.
Online Resources
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Grundfos DDA 7.5-16 spare parts: frequently asked questions
Tap a question to see the answer.
What spare parts are listed for the Grundfos DDA 7.5-16 FCM-C-PVC?
The list covers service kits (valves plus diaphragm), suction and discharge valve kits and complete FCM dosing heads in FKM or EPDM versions, plus the PTFE-coated diaphragm kit, deaeration valves, the dosing head cover, the wall mounting plate and the FCM sensor service tool.
Should I choose FKM or EPDM parts for my DDA?
Service kits, valve kits and complete heads are listed in both PVC/FKM/ceramic and PVC/EPDM/ceramic versions. The right elastomer depends on the chemical you dose, so tell us your fluid on the quote form and we'll confirm the correct kit.
What does liquid leaking from the drain hole mean?
It points to a ruptured primary diaphragm. The troubleshooting guide on this page says to replace the diaphragm kit (97751707) immediately. If the pump runs but detects no liquid, the likely cause is an air lock, cleared with the deaeration valve or a new valve kit.
How do I make sure I order the right DDA parts?
Tick the parts you need and your selection carries into the quote form. If you're unsure of the exact model, add a photo of the nameplate. See the wider Grundfos DDA range or all Grundfos pump spare parts.