The library
Check dryer inlet temperature before buying
Record the temperature where air enters the dryer. Verify capacity at that temperature separately from the model’s maximum permitted inlet temperature.
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Find the actual inlet condition
Use the temperature at the dryer inlet and retain the measurement conditions. Ask how the proposed system's aftercooler, receiver and installation affect the air that reaches the dryer. Do not substitute room temperature for inlet temperature.
CAGI describes the aftercooler as removing compression heat, with a separator removing condensed liquid. Ask what temperature the aftercooler delivers during the hottest expected operating period. That answer helps establish the dryer inlet value.
Check both limits and capacity
California Air Tools lists a 176°F maximum inlet temperature for RD-91502 and RD-91503. That operating limit alone does not establish the published flow capacity at 176°F. The captured product pages do not provide the correction table needed to make that calculation.
Parker's SPE table illustrates why the distinction matters: it lists different required-capacity multipliers at different inlet temperatures. Those values belong to the SPE family and its documented conditions. They cannot be copied to a California Air Tools model.
Include the room condition
Record the ambient temperature around the dryer as a separate input. Verify the manufacturer's ventilation and installation requirements in the exact model manual. A temperature that stays within an operating limit still needs the applicable capacity and dew-point evidence.
Put the readings into your supplier worksheet. Use the model comparison to identify the exact electrical variant, then ask for capacity and pressure dew point at the complete set of conditions.
Sources and limitations
Catalog 0700P: Refrigeration Dryers Checked 2026-11-07
Parker Hannifin · Source document
Published: Date unavailable · M4, Product Selection and Correction Factors
Minimum Drying Capacity = System flow x CFIT x CFATx CFMIP
Dated web extraction; fresh raw PDF request returned 403 on November 12, 2026. Numeric PDP, standard reference state and package admission unresolved.
RD-91502 product specifications Checked 2026-11-12
California Air Tools · Source document
Published: Date unavailable · FEATURES; model/SKU fields above the description
Max Inlet Temperature: 176F
No correction table in captured product page. Headline52CFM differs from feature52.97CFM; retain both. Numeric PDP range does not promise its lower endpoint at all conditions.
RD-91503 product specifications Checked 2026-11-12
California Air Tools · Source document
Published: Date unavailable · FEATURES; model/SKU fields above the description
Max Inlet Temperature: 176F
No correction table in captured product page. Headline52CFM differs from feature52.97CFM; retain both. Numeric PDP range does not promise its lower endpoint at all conditions.
Compressed Air and Gas Drying Checked 2026-11-12
Compressed Air & Gas Institute · Source document
Published: Date unavailable · Printed pages 3–4, 7–9; selecting, specifying and drying system sections
Naming a pressure dew point is how to state the degree of dryness wanted.
General technology guidance; does not establish any listed model’s performance.