Grundfos CR 1S-3 — material number 99915322 — is a 3-stage Grundfos CR vertical multistage centrifugal pump with a 1/3 HP, 3-phase, 208-230/460 V NEMA TEFC motor and a HQQE shaft seal.
This 3-stage configuration produces a moderate 105 ft of head at the BEP (4 GPM, ~45 psi) and is the most common choice for low-rise commercial boosting and short pipe runs where modest pressure is needed.
Specifications
| Model | CR 1S-3 |
| Stages | 3 |
| Flow at BEP | 4 GPM |
| Head at BEP | 105 ft (~45 psi) |
| Shutoff head (approx.) | 126 ft |
| Motor | 1/3 HP, 3-phase, 208-230/460 V, NEMA TEFC on 56C frame |
| Shaft seal | HQQE (SiC/Carbon EPDM) |
| Materials | Cast iron head/base; 304 SS chambers and impellers |
| Material number (P/N) | 99915322 |
| Shipping weight | 52 lbs |
| Frequency | 60 Hz |
| Brand | Grundfos |
| Country of origin | Denmark / USA (varies by date code) |
Dimensions
| Approximate dimensions (vertical pump) | |
|---|---|
| Overall height (pump + motor) | 31.3 in |
| Pump body height (3 stages) | 19.3 in |
| Base height (stage 0) | 14.5 in |
| Added height per stage | 1.6 in |
| Motor frame | See spec table above |
| Mounting | Vertical foot-mounted |
| Motor orientation | Vertical with NEMA motor stool above pump head |
Note: Dimensions are approximate and based on the Grundfos CR 1S data booklet. Exact dimensions vary slightly by motor frame and base style. For certified installation drawings of this specific material number, request a quote and we'll provide the official Grundfos dimensional drawing.
Pipe Connections
The Grundfos CR 1S series is available with multiple connection types to match your installation requirements. Connection sizes for this series:
| Connection options | |
|---|---|
| Standard pipe connection (oval flange) | 1 inch NPT |
| ANSI flange size | 1-1/4 inch |
| ANSI flange class | 250 lb |
| Inlet / outlet orientation | Suction and discharge on the same horizontal centerline (in-line) |
Companion connections (gaskets, bolts, ANSI flanges or Victaulic couplings) are ordered separately. Contact ForeverPure for the matched connection kit part numbers for your specific configuration.
Available Configurations / Material Numbers
The CR 1S-3 ships in several phase, voltage, and seal combinations. Material numbers for the most common variants:
| Phase / Voltage | Seal | Motor HP | Weight | Material Number |
|---|---|---|---|---|
| 1-phase, 115/230 | HQQE | 1/3 HP | 54 lbs | 99915253 |
| 3-phase, 208-230/460 | HQQE | 1/3 HP | 52 lbs | 99915322 |
| 1-phase, 115/230 | HQQV | 1/3 HP | 54 lbs | 99915268 |
| 3-phase, 208-230/460 | HQQV | 1/3 HP | 52 lbs | 99915336 |
| 1-phase, 115/230 | HQQE | 1/3 HP | 69 lbs | 99915283 |
| 3-phase, 208-230/460 | HQQE | 1/3 HP | 62 lbs | 99915350 |
| 1-phase, 115/230 | HQQV | 1/3 HP | 69 lbs | 99915303 |
| 3-phase, 208-230/460 | HQQV | 1/3 HP | 62 lbs | 99915371 |
Typical Applications
- Boiler feed water in industrial steam plants
- Cooling tower makeup water
- High-rise commercial pressure boosting
- HVAC chilled water circulation
- Fire protection jockey pump
- Light industrial process water
Datasheet & Documentation
- Grundfos CR/CRI/CRN North America Data Booklet (PDF)
- CR/CRI/CRN/CRT Installation & Operating Instructions (PDF)
- CR Service Manual (PDF)
Frequently Asked Questions
- What is the maximum head/flow of the Grundfos CR 1S-3?
- The CR 1S-3 produces approximately 105 ft of head at 4 GPM (best efficiency point), with a shutoff head of about 126 ft. That corresponds to roughly 45 psi at the BEP.
- What is the Grundfos CR 1S-3 material number / part number?
- The primary material number for this configuration (3-phase 208-230/460, HQQE seal) is 99915322. Other voltage and seal options are listed in the variants table on this page.
- Which motor does the Grundfos CR 1S-3 use?
- This SKU ships with a 1/3 HP, 3-phase, 208-230/460 V NEMA TEFC motor on a 56C frame. Other motor configurations and IE3/IE5 upgrades are available on request.
- Can the Grundfos CR 1S-3 be paired with a variable frequency drive (VFD)?
- Yes. Order the matching E-Pump variant with integrated MLE permanent-magnet motor, or pair this fixed-speed pump with a Grundfos CUE external VFD.
- What is the typical lead time for the Grundfos CR 1S-3?
- Many configurations of the CR 1S series ship from stock through Grundfos USA. Contact ForeverPure Place for the current lead time on this specific material number (99915322).
Related Products
- Browse all Grundfos CR 1S stage configurations
- All CR, CRI, CRN vertical multistage pumps
- Complete Grundfos catalog
