The Hoffman SpectraCool G-series crosses to the Pfannenberg DTS side mount series, and every G28 and G52 size has a Pfannenberg adapter plate for a bolt-over retrofit. Capacity is compared below at the 95°F/95°F rating point.
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SpectraCool G-series to Pfannenberg cross reference
| Model | Published BTU/hr | BTU/hr at 95/95 curve | Voltages | NEMA type | Pfannenberg cross |
|---|---|---|---|---|---|
| G28-04x6-Gxxx | 3,410/4,625 | 3,200/4,400 | 115/230/460 | 12, 3R, 4, 4X | DTS 31X1 SL |
| G28-06x6-Gxxx | 6,000/5,685 | 6,050/5,450 | 115/230/460 | 12, 3R, 4, 4X | DTS 31X5 |
| G52-08x6-Gxxx | 6,800/7,112 | 6,800/7,112 | 115/230/460 | 12, 3R, 4, 4X | DTS 32X1 |
| G52-12x6-Gxxx | 10,700/9,800 | 11,200/9,800/9,400 | 115/230/460 | 12, 3R, 4, 4X | DTS 32X5 |
| G57-20x6-Gxxx | 18,000/21,400 | 20,200 | 230/460 | 12, 3R, 4, 4X | DTS 34X1C |
The X position in a Pfannenberg DTS model number is the voltage code. Example: DTS 31X1 is the 4,000 BTU/hr side mount family; the exact orderable part number depends on 115, 230 or 460V. Send the voltage and we return the full part number.
Adapter plates for G-series retrofits
| Hoffman model being replaced | Pfannenberg cross | Adapter plate P/N |
|---|---|---|
| G28-04x6-Gxxx | DTS 31X1 SL | 18380000040 |
| G28-06x6-Gxxx | DTS 31X5 | 18380000042 |
| G52-08x6-Gxxx | DTS 32X1 | 18380000045 |
| G52-12x6-Gxxx | DTS 32X5 | 18380000039 |
The plate covers the existing Hoffman cutout so the Pfannenberg unit mounts over the opening. No new cutout, no blanking plate fabrication.
Compare capacity at 95°F/95°F, not the nameplate
Enclosure air conditioner ratings are not published at a single standard condition, so nameplate BTU/hr numbers across brands are not directly comparable. The honest comparison is capacity at 95°F ambient and 95°F enclosure temperature, read off the manufacturer's performance curve. A unit sold as 3,900 BTU/hr can deliver 3,400 BTU/hr at the 95/95 point. Every table on this page shows both numbers.
Four things have to line up before a substitution is valid:
- Capacity at the rating point. Match 95/95 performance, not marketing BTU.
- Voltage. 115, 230 or 460V must match the nameplate.
- Enclosure rating. NEMA Type 12, 3R, 4 or 4X on the air conditioner must match the enclosure environment.
- Mounting cutout. A capacity cross is not a cutout cross. Pfannenberg adapter plates exist for specific Hoffman retrofits; otherwise plan the panel work.
Also check where the cold air supply sits relative to the hot air return. Several competitor designs place them within 2 to 6 inches of each other, which lets cold discharge short-cycle straight back into the return and cuts effective cooling.
Common questions
What is the Pfannenberg equivalent of the Hoffman SpectraCool G28?
The G28-04 crosses to the Pfannenberg DTS 31X1 SL with adapter plate P/N 18380000040, and the G28-06 crosses to the DTS 31X5 with adapter plate P/N 18380000042. At the 95F/95F point the G28-04 delivers 3,200 to 4,400 BTU/hr and the G28-06 delivers 5,450 to 6,050, against 5,097 for the DTS 31X1 SL and 6,995 for the DTS 31X5.
What is the Pfannenberg equivalent of the Hoffman SpectraCool G52?
The G52-08 crosses to the Pfannenberg DTS 32X1 with adapter plate P/N 18380000045, and the G52-12 crosses to the DTS 32X5 with adapter plate P/N 18380000039. At 95F/95F the G52-12 delivers 9,400 to 11,200 BTU/hr and the DTS 32X5 delivers 11,500.
Do the SpectraCool G-series published ratings match the 95F/95F performance?
Not always. The G28-04 publishes 3,410 to 4,625 BTU/hr but delivers 3,200 to 4,400 at the 95F/95F point depending on voltage. Compare both numbers before sizing a replacement; the tables on this page show both.
Can a Pfannenberg unit mount in the existing SpectraCool G-series cutout?
Yes, with the adapter plate. Pfannenberg plates 18380000040, 18380000042, 18380000045 and 18380000039 cover the existing G28 and G52 cutouts so the replacement bolts over the opening without new panel work.
Get a cross-referenced quote
Send the model number off the nameplate and the voltage. We come back with the Pfannenberg cross, the adapter plate if one exists for the retrofit, and a price inside 48 hours.
Email: christian.lauderback@appliedcontrolinc.com
Phone: 248-425-9065
HOFFMAN, SpectraCool and ProAir are trademarks of nVent or its affiliates. SCE and Enviro-Therm are trademarks of Saginaw Control & Engineering. Pfannenberg is a registered trademark of Pfannenberg GmbH. Applied Control Inc. is an authorized Pfannenberg manufacturers' representative and is not affiliated with, endorsed by, or sponsored by nVent or Saginaw Control & Engineering. Competitor part numbers appear here solely to identify products for comparison. Capacities are compared at the 95°F ambient / 95°F enclosure rating point using publicly available performance data and are subject to change. Verify current specifications against the manufacturer’s own datasheet before purchase or installation.