HVAC PT Charts

Carrier R410A Charging Chart: Target Superheat by Fixed-Orifice Ambient

Updated October 25, 2026

A complete walk-through of Carrier's fixed-orifice R-410A target-superheat chart: the chart itself, the R-410A saturation pressures it implies (so you know what to see on the manifold), three worked field examples, the full charging procedure, common-error diagnostics, and an interactive lookup. Every pressure value below comes from CoolProp 7.2.0 saturation data for R-410A; nothing is approximated or generic.

01What this chart is and who needs it

The Carrier R-410A target-superheat chart is a 2-axis lookup table (outdoor dry-bulb × indoor wet-bulb) published as part of Carrier's service reference for fixed-orifice residential air-conditioners. Carrier-family OEMs (Bryant, ICP, Heil, Tempstar, Comfortmaker) ship the same chart on their installation literature. For a given combination of outdoor and indoor conditions, the chart tells the technician what superheat (suction-line temperature minus suction saturation temperature) the evaporator should produce when the system is charged correctly.

Why a chart, not a single number
Fixed-orifice metering devices (pistons, flowrators, capillary tubes) cannot self-adjust to varying conditions like a TXV can. As outdoor temperatures rise, head pressure rises, which drives more refrigerant flow through the same orifice; as indoor humidity rises, the evaporator pulls more latent heat and saturation temperature climbs. The chart embeds those condition-dependent shifts so the target superheat at 95°F OD / 67°F WB (10°F SH) is different from the target at 75°F OD / 60°F WB (12°F SH) even though both look like "normal" AC operation.

The chart applies onlyto fixed-orifice systems. If the indoor coil uses a thermostatic expansion valve (TXV) or electronic expansion valve (EEV), and most Carrier residential equipment built after roughly 2015 does, you charge by subcooling instead, targeting 8-12°F SC at the liquid line. Confusing the two procedures will lead you to wrong conclusions: a TXV system charged to a superheat chart target will read "off" because the TXV is actively maintaining its own evaporator superheat regardless of what you do with the charge.

How to tell which metering device you have: open the indoor coil access panel and look at the distributor inlet. A piston (fixed-orifice) is a small brass plug, often with a stamped number indicating orifice size (e.g. "65" for 6.5 thousandths of an inch). A TXV is a 2-3 inch valve body with a sensing bulb wrapped around the suction line near the evaporator outlet. If you can't identify it visually, the installation manual or unit data plate will specify the metering type.

02The Carrier R-410A target-superheat chart

This is the full Carrier Table 3, "Superheat Charging — AC Only", reproduced verbatim: each row is an outdoor temperature and each columnis an evaporator entering-air wet-bulb. Values are °F target superheat at the suction service port. A dash (—) means Carrier does not publish a target for that combination — the indoor wet-bulb is too low for the outdoor temperature and charging there risks compressor slugging, so do not charge. Newer SEER2 equipment may carry an updated chart on the unit's access-panel sticker — always check there first.

Target superheat (°F) — Carrier/Bryant R-410A fixed-orifice Table 3. Rows = outdoor temperature (°F); columns = evaporator entering-air wet-bulb (°F). Tolerance ±3°F.
OD °F ↓ / WB °F →505254565860626467†6870727476
55912141720232629323537404245
60710121518212427303335384043
65—6101316192124273033363841
70——71013161921242730333639
75———69121518212428313437
80————581215182125283135
85——————811151922263033
90——————59131620242731
95———————6101418222529
100————————81215202327
105————————5913172226
110—————————611152025
115——————————8141823

Source: Carrier "Installation Instructions 24AAA5, 24AAA6, 24ABB3, 24ABC6, 24ACA4, 24ACC4", Catalog No. 24AAA-ACC-6SI, edition 10/16, Table 3 "Superheat Charging — AC Only"; identical in Bryant II114CNA-CNC-03 (09/15), Table 3.

Tolerance ±3°F; — = do not charge under these conditions (risk of slugging).

† The wet-bulb column printed as 67°F in the source sits between 64°F and 68°F; the 2°F spacing and its values suggest 66°F.

Chart vs. the general field formula. Carrier's published table gives 10°F at 95°F OD / 67°F WB; the general field approximation targetSuperheat(67,95) gives 13°F — a 3°F difference, within the ±3°F the formula claims. The formula is a useful cross-check, but use Carrier's table for Carrier equipment.

Reading the table: at 95°F outdoor and 67°F indoor wet-bulb, read straight across the 95°F row to the 67°F column — 10°F SH. If your wet-bulb falls between published columns (they step every 2°F), snap down to the nearest column or interpolate the two neighboring Carrier cells; the interactive lookup below does the snap for you.

03Interactive lookup: target superheat + matching R-410A pressures

Type your indoor wet-bulb and outdoor dry-bulb. The widget returns the chart's target superheat, the implied R-410A saturated suction pressure (what you should see on the low-side manifold), and the implied high-side pressure. The pressure values come from our verified R-410A PT data — same numbers a technician would calculate by hand from the chart and a printed PT card, just done for you.

Interactive lookup — Carrier R-410A target superheat

Measured at the return-air grille. Typical cooling: 60-72°F WB.

At condensing unit, in shade. Typical design: 85-105°F.

Enter your wet-bulb + outdoor temp, then click Calculate target superheat.
Methodology + assumptions

Target superheat values are read directly from Carrier/Bryant Table 3, "Superheat Charging — AC Only" (chart tolerance ±3°F; the widget snaps your inputs down to the nearest published wet-bulb column and outdoor-temp row). Suction saturation assumes a ~17°F approach between indoor wet-bulb and evaporator saturated suction, a residential design rule of thumb, not a charging-chart value. High-side assumes a 25°F condenser approach — the high end of the typical 15–25°F residential range (high-efficiency units run nearer the low end). Actual values vary ±3-5°F by coil sizing, line set length, system age. Saturation pressures from CoolProp 7.2.0 (REFPROP-compatible Helmholtz EOS).

04R-410A pressure cross-reference (what should the manifold read?)

The chart tells you target superheat, not target pressure. To turn the chart into a pressure-and-temperature target you can read directly on the manifold, you need the R-410A saturated suction pressure at the implied evaporator saturation temperature (typically indoor WB − 17°F for a properly-sized residential coil, a design rule of thumb, not a charging-chart value). The table below pre-computes that pressure for common indoor WB conditions using our verified R-410A PT data.

Expected R-410A saturated suction pressure at common indoor wet-bulb conditions. Suction line temperature = (saturation temp) + (target superheat from chart).
Indoor WBSat. evap. tempSat. suction PSIGHigh-side @ 95°F ODHigh-side @ 110°F OD
60°F43°F125.8419509
63°F46°F133.0419509
65°F48°F138.0419509
67°F50°F143.2419509
70°F53°F151.1419509

High-side numbers assume a 25°F condenser approach (saturated condensing temperature = outdoor DB + 25°F), which is typical for a clean residential condenser. A dirty or undersized condenser will run a higher approach (35-45°F), and the high-side pressure will be correspondingly higher. If your high-side is more than ~30 PSIG above the values in the table, see our high head pressure diagnostic guide.

05Worked example 1 — Design conditions (95°F outdoor, 67°F wet-bulb)

1
Service problemR-410A

Summer commissioning, ARI design conditions

Scenario · Brand-new install. Outdoor 95°F dry-bulb (ARI rating point). Indoor return air 78°F dry-bulb / 67°F wet-bulb (54% RH at 78°F). Carrier 3-ton fixed-orifice residential split system, line set 22 ft.

Chart lookup
95°F OD × 67°F WB 10°F SH direct Carrier Table 3 cell — no interpolation
Tolerance ±3°F per Carrier chart notes
Expected manifold readings
Sat. evap. temperature 50°F 67°F WB − 17°F approach (rule of thumb)
Expected suction PSIG 143 PSIG R-410A saturation @ 50°F
Expected suction-line temp 60°F 50°F sat + 10°F target SH
Sat. condensing temp 120°F 95°F OD + 25°F approach
Expected high-side PSIG 419 PSIG R-410A saturation @ 120°F
Result · What this looks like in the field
You connect manifold gauges. Suction reads 143 PSIG (matches expected, ~50°F saturation). You apply your suction-line probe and read 60°F. Measured SH = 60°F − 50°F sat = 10°F. Chart target is 10°F. Charge is correct; no adjustment needed. Document the readings and move on.
Fix
What to do if measured SH is 18°F instead of 10°F (suction line reads ~68°F): system is undercharged by roughly 8°F SH. On a 3-ton R-410A residential system, each ~1°F change in SH corresponds to roughly 1-2 oz of charge. Add 12-16 oz from the cylinder in 4 oz increments, waiting 5 minutes between additions, until SH lands within ±2°F of the 10°F target.
Fix
What to do if measured SH is 3°F instead of 10°F (suction line reads ~53°F): system is overcharged. Recover refrigerant in 4 oz increments. Excess R-410A at design conditions causes flood-back to the compressor (liquid refrigerant in the suction line) — long-term this destroys the compressor by washing out lubricant.

06Worked example 2 — Mild day (75°F outdoor, 62°F wet-bulb)

2
Service problemR-410A

Spring service call, mild outdoor temperature

Scenario · Homeowner reports the unit is 'running constantly but not cooling well.' You arrive on a mild 75°F day. Indoor return: 72°F dry-bulb / 62°F wet-bulb. Same Carrier 3-ton fixed-orifice system.

Chart lookup
75°F OD × 62°F WB 15°F SH direct Carrier Table 3 cell (columns step 2°F, rows 5°F)
Target superheat 15°F SH higher than a hot-day target — low outdoor head pressure calls for more superheat
Expected manifold readings
Sat. evap. temperature 45°F 62°F WB − 17°F approach (rule of thumb)
Expected suction PSIG 131 PSIG R-410A saturation @ 45°F
Expected suction-line temp 60°F 45°F sat + 15°F target SH
Sat. condensing temp 100°F 75°F OD + 25°F approach
Expected high-side PSIG 319 PSIG R-410A saturation @ 100°F
Investigate · When mild-day SH disagrees with the chart
You measure suction at 119 PSIG (~40°F saturation, below the ~45°F you would expect). Suction line reads 80°F. Measured SH = 80°F − 40°F sat = 40°F. Chart target is 15°F SH. Measured SH is 25°F high → significantly undercharged. The system has been short of refrigerant long enough that the homeowner notices poor cooling capacity, but the symptoms only became severe enough to call you when ambient cooled and the system started running long cycles to keep up.
Fix
Recommended action:leak-check first (high SH that didn't exist at last service almost always means a leak), then weigh in the difference. Don't just top off charge without finding the leak — you'll be back next month. Common R-410A leak points: Schrader valve cores (cheap fix, often the cause), flare connections at the indoor coil, and aluminum spine-fin coil corrosion.

07Worked example 3 — Hot day (105°F outdoor, 70°F wet-bulb)

3
Service problemR-410A

Heat wave, system not keeping up

Scenario · Phoenix, Arizona, 105°F afternoon. System has been running 6 hours straight, indoor temperature drifting up from 72°F setpoint to 78°F. Indoor return: 80°F dry-bulb / 70°F wet-bulb (high humidity for a desert, likely from cooking + occupancy load). Same Carrier 3-ton fixed-orifice.

Chart lookup
105°F OD × 70°F WB 13°F SH direct Carrier Table 3 cell — no interpolation needed
Expected manifold readings
Sat. evap. temperature 53°F 70°F WB − 17°F approach (rule of thumb)
Expected suction PSIG 151 PSIG R-410A saturation @ 53°F
Expected suction-line temp 66°F 53°F sat + 13°F target SH
Sat. condensing temp 130°F 105°F OD + 25°F approach
Expected high-side PSIG 478 PSIG R-410A saturation @ 130°F
Action required · High-side approach is the smoking gun on hot days
You measure suction at 151 PSIG (matches expected). Suction line reads 66°F, so measured SH = 66°F − 53°F sat = 13°F — on target, charge is fine. But the high side reads about 577 PSIG, well above the expected 478 PSIG. That's roughly a 40°F condenser approach instead of 25°F — heat-rejection failure, not a charging problem. Common cause: a dirty condenser coil baking in 105°F sun with reduced airflow. The system is correctly charged but the condenser can't reject heat fast enough.
Fix
This is the value of measuring all three numbers (suction PSIG, suction-line temp, high-side PSIG) instead of just one. If you'd only looked at superheat (13°F, matches the 13°F chart target), you'd conclude "charge is correct, system is fine" and leave the homeowner with a system that still can't keep up. The high-side PSIG is the diagnostic that catches the real problem: clean the condenser. See high head pressure diagnostic guide for the full decision tree.

08Step-by-step charging procedure

Follow these nine steps in order. Steps 1-3 verify the chart applies and gather chart inputs. Steps 4-7 read measured values. Steps 8-9 close the loop with charge adjustment and documentation.

  1. 1

    Confirm the metering device is fixed-orifice (not TXV)

    Check the indoor coil label or installation sticker. Fixed-orifice systems (piston, flowrator, capillary tube) use this superheat chart. TXV/EEV systems use subcooling instead (8-12°F SC target). If the system has a TXV, this chart will give you wrong answers — switch to the subcooling calculator.

  2. 2

    Measure outdoor dry-bulb at the condenser, in shade

    Use a digital thermometer or thermistor probe shaded from direct sun, 4-6 ft from the condenser intake. Sunlit dry-bulb reads 5-10°F high and will skew the chart target. Wait 5 minutes after a thermometer move for the probe to stabilize.

  3. 3

    Measure indoor wet-bulb at the return grille

    Use a sling psychrometer or digital meter with a wetted wick. Hold the probe in moving return air for 30 seconds. Typical residential range: 55-72°F WB. A digital meter with a dry wick reads low, so re-wet the wick before measuring. Record both dry-bulb and wet-bulb; the difference confirms humidity is in the chart range.

  4. 4

    Look up target superheat from the chart

    Find the row matching your outdoor DB and the column matching your indoor WB. Carrier publishes wet-bulb columns every 2°F and outdoor rows every 5°F — snap down to the nearest published value. Read the target superheat. If your conditions fall in a blank cell (—), the chart says do not charge: the system is outside the charging envelope, so wait for design conditions and try again.

  5. 5

    Connect manifold gauges and let the system stabilize

    Run the unit at 100% load (no Eco mode, no setback) for at least 10-15 minutes before reading pressures. Connect the low-side gauge to the suction service port and high-side to the liquid line port. Note suction pressure in PSIG.

  6. 6

    Measure suction-line temperature with a calibrated probe

    Attach an insulated thermistor probe to a clean, dry section of the suction line at least 6 inches downstream of the evaporator outlet (not on a return bend). Cover the probe with insulation foam to isolate from ambient air. Wait 60-90 seconds for the reading to stabilize.

  7. 7

    Calculate measured superheat

    Look up the saturation temperature for your measured suction pressure on the R-410A PT chart (dew / saturated-vapor side), then subtract it from your measured suction-line temperature: SH = Suction Line °F − Saturation °F. Example: a ~50°F evaporator saturation reads about 143 PSIG on R-410A; if the suction line reads 60°F, SH = 60 − 50 = 10°F — matching the 95°F OD / 67°F WB chart target.

  8. 8

    Compare to the chart target and adjust charge

    If measured SH > chart target: undercharged. Add R-410A in 2-4 oz increments, wait 5 minutes, re-measure. If measured SH < chart target: overcharged. Recover refrigerant in 2-4 oz increments, wait, re-measure. Within ±2°F of chart target is acceptable; tighter than that is over-tuning given measurement uncertainty.

  9. 9

    Re-verify and document

    After charge adjustment, let the system run another 10 minutes at full load, re-read all values, and confirm SH is on target. Document final suction PSIG, suction line temp, calculated SH, outdoor DB, indoor WB, and total charge weight added/removed on the service ticket.

09Common errors and how to avoid them

Error 1 — Reading wet-bulb wrong

A digital psychrometer with a dry wick reads several degrees below true wet-bulb. The result: you look up a chart row that calls for less superheat than reality requires, and undercharge the system trying to match a target that's too low. Always re-wet the wick or use a sling psychrometer with a freshly soaked sock. Cross-check: at typical residential conditions, RH from a calibrated meter and dry-bulb should yield a wet-bulb within ±1°F of the meter's direct WB reading.

Error 2 — Charging during a transient

The chart targets are steady-statevalues. After the system has been off for several hours, or just after a defrost cycle (heat-pump mode), or in the first 5-10 minutes of operation, pressures and temperatures are still equilibrating. A reading at minute 3 of operation can read 5-10°F off from the steady-state value. Always wait at least 10 minutes of continuous full-load operation before recording values. If the thermostat is satisfied and the system cycles off mid-charge, you'll need to override the thermostat to keep it running.

Error 3 — Long line sets without correction

Carrier's chart targets assume a standard 15 ft line-set length. For longer line sets (common in two-story homes or basement installs), suction-line pressure drop between the evaporator and the service port at the condenser inflates the measured suction-line temperature relative to the actual evaporator saturation temperature. Effect: measured SH at the service port reads 1-2°F higher than "true" SH at the evaporator outlet for every additional 25 ft of line set. Adjust the chart target down 1-2°F for line sets in the 25-50 ft range; for very long line sets (50+ ft), consult the equipment installation manual's line-set adjustment table.

Error 4 — Suction probe mounted incorrectly

The thermistor probe must sit on a clean, dry section of copper at least 6 inches downstream of the evaporator outlet, on a straight run (not on a return bend), and covered with insulation foam to isolate from ambient. A probe in still air reads ambient temperature, not refrigerant temperature. Symptom: measured suction-line temp tracks outdoor air temperature instead of changing with charge. Fix: clean the copper with a wire brush, fit the probe flush with copper-tape or a velcro band, then wrap with 1/2-inch foam insulation.

Error 5 — Using this chart on a TXV system

If the indoor coil has a TXV or EEV, this chart will give wrong answers. The TXV is actively maintaining its own evaporator superheat (typically 8-15°F per OEM TXV specs), so measured SH at the suction service port will track the TXV setpoint regardless of charge. The chart targets (5-33°F SH) are calibrated for fixed-orifice flow — applying them to a TXV system means you'll either dramatically overcharge or dramatically undercharge trying to hit a target the TXV won't let the system reach. If the system has a TXV, switch to subcooling: target 8-12°F SC at the liquid line, refrigerant-side, regardless of outdoor conditions.

10When NOT to use this chart

  • TXV / EEV metering devices — use the subcooling calculator instead. Target: 8-12°F SC at the liquid line.
  • Outdoor below 65°F— chart isn't valid. Wait for warmer conditions or use weighed-in charging per the unit's nameplate.
  • Heat-pump mode (winter heating) — separate chart applies; this one is cooling-mode only. Most OEMs publish a heating-mode counterpart.
  • R-410A → A2L refrigerant retrofits (R-32, R-454B) — A2L refrigerants have different saturation curves, glide (in the case of R-454B), and OEM-specific target tables. R-454B uses similar superheat targets as R-410A in fixed-orifice equipment due to its near-azeotrope behavior, but R-32 (pure) has substantially different operating pressures. See R-32 page and R-454B page for application-specific data.
  • Newly installed system without nameplate charge — the chart adjusts charge based on operating conditions, but you need a baseline. Weigh in the nameplate charge first (factory charge + line-set adjustment per the installation manual), then use this chart to verify and fine-tune.
  • System with a known refrigerant leak — charging without fixing the leak is putting fresh refrigerant into the atmosphere. Find and repair the leak, evacuate to 500 microns or better, then weigh in clean charge and verify against the chart.

11TXV alternative — subcooling charging (the modern path)

Carrier residential equipment built after roughly 2015 uses thermostatic expansion valves, not fixed orifices. With a TXV, the metering device actively varies its opening to maintain a constant evaporator superheat regardless of conditions, so measuring superheat tells you about the TXV's health, not the charge. Instead, you charge a TXV system by measuring subcooling at the liquid line.

Subcooling target
For most Carrier R-410A TXV residential equipment: target 8-12°F SC at the liquid line. This target is the same regardless of outdoor temperature, indoor humidity, or time of year. Subcooling = saturation temperature (at high-side pressure) − measured liquid-line temperature. If SC > 15°F: overcharged. If SC < 5°F: undercharged. The actual OEM target may differ slightly by model — always check the data plate sticker on the outdoor unit; some Carrier high-efficiency models target 14°F SC.

Use the subcooling calculator for TXV charging, or the combined PT/SH/SC calculator if you want to verify both sides on a fixed-orifice system. The combined calculator handles the chart-based superheat target lookup the same way the interactive widget on this page does.

12Is this chart interchangeable with other brands?

Most fixed-orifice R-410A charging charts follow the same indoor-wet-bulb × outdoor-dry-bulb method and land within a few degrees of each other. Always use the chart printed on the specific unit or in its installation manual.

13Frequently asked

›Is the Carrier R-410A charging chart the same as other brands' charts?

Most fixed-orifice R-410A charging charts follow the same indoor-wet-bulb × outdoor-dry-bulb method and land within a few degrees of each other. Always use the chart printed on the specific unit or in its installation manual.

›What if the indoor wet-bulb is between two chart columns (e.g. 63°F WB)?

The interactive lookup snaps your wet-bulb down to the nearest published column, and Carrier's columns step every 2°F, so 63°F WB is read on the 62°F column. If you want a between-columns estimate, interpolate the two neighboring Carrier cells (not a generic formula): at 85°F outdoor, the 62°F WB column is 8°F SH and the 64°F WB column is 11°F SH, so 63°F WB is about 9.5°F SH. Keep the interpolation inside the chart. A 3°F SH error is the difference between mild undercharge and mild overcharge.

›Can I use this chart for R-22 retrofit equipment that's been converted to R-410A?

No. R-22 systems cannot be retrofitted to R-410A; R-410A runs far higher pressure. At a typical ~50°F evaporator saturation the low side sits near 143 PSIG on R-410A versus about 84 PSIG on R-22 (roughly 70% higher), and R-22 condensers, line sets, and compressors are not rated for R-410A pressures. Any "R-22 to R-410A retrofit" is an equipment replacement, not a conversion. If your system is labeled R-410A, use this chart; if it's labeled R-22, use the R-22 chart.

›Why are the low-wet-bulb cells blank at high outdoor temperatures?

Low indoor humidity (low WB) combined with high outdoor temperatures is rare in residential AC operation. It usually means the indoor coil isn't doing latent work, often because the home is already dry or the unit has been running for hours after a moisture-pull cycle. In these conditions the evaporator approach is too small to produce meaningful superheat, and charging risks compressor slugging, so the system should be allowed to cycle off. The chart's blank cells (—) are an honest "do not charge under these conditions" signal, not missing data.

›Why does my measured superheat read several degrees off-chart even though pressures look normal?

Three common causes. (1) Thermometer placement: the suction-line probe must be on a clean, insulated section of copper at least 6 inches downstream of the evaporator exit, not in the return bend. A poorly attached probe reads ambient, not refrigerant. (2) Line-set length: longer line sets (>25 ft) increase pressure drop between coil and service port, which inflates measured superheat at the service port relative to the chart target. Adjust the chart target down 1-2°F per extra 25 ft. (3) Indoor wet-bulb measurement: a digital psychrometer in cool dry air may read low if the wick is dry; always wet the wick before measuring.

›When should I use subcooling charging instead of this superheat chart?

Use subcooling for TXV or EEV metering devices (8-12°F SC target, refrigerant-independent of outdoor conditions). Use this superheat chart for fixed-orifice / piston / capillary tube devices. Most Carrier residential systems built after ~2015 use TXVs; the superheat chart is for the older fixed-orifice equipment that's still in service. Check the indoor coil's metering-device label: "TXV" or "EEV" means subcool; "piston" or "flow rator" means the superheat chart.

›What does a target superheat of 6°F at 95°F outdoor mean? Is 6°F too low?

It's an instruction, not a warning. At 64°F WB × 95°F OD the chart target is 6°F SH: the system is running with relatively low latent load on a hot day, and the chart calls for tight superheat so the coil stays fully fed (an overcharged coil at these conditions would flood liquid back to the compressor). 6°F SH is normal here on a fixed-orifice system. Adjust the charge until measured SH matches the chart; don't second-guess it by aiming for a comfortable 10-15°F.

›What suction pressure should I see at 95°F outdoor / 67°F wet-bulb on a properly-charged R-410A system?

Around 143 PSIG suction. The math: a 67°F indoor wet-bulb pulls the saturated suction temperature to roughly 50°F (about a 17°F approach, a residential rule of thumb, not a chart value); R-410A saturation at 50°F is 143 PSIG. The chart target at 95°F OD / 67°F WB is 10°F SH, so a correctly charged suction line reads about 60°F. Pressure too high means likely overcharge or restricted air. Pressure too low means undercharge or evaporator airflow problem.

14Sources and verification

  • Chart values: Carrier "Installation Instructions 24AAA5, 24AAA6, 24ABB3, 24ABC6, 24ACA4, 24ACC4", Catalog No. 24AAA-ACC-6SI, edition 10/16, Table 3 "Superheat Charging — AC Only"; identical in Bryant II114CNA-CNC-03 (09/15), Table 3.
  • Carrier, Bryant and Puron are trademarks of their respective owners. HVAC PT Charts is not affiliated with or endorsed by Carrier Corporation.

R-410A saturation pressures: generated from CoolProp 7.2.0 with the HEOS backend (REFPROP-compatible Helmholtz equation of state for R-410A, based on Lemmon et al. 2003) across the operating range (−40°F to +150°F). The verified PT data behind every pressure on this page lives at our R-410A reference page and is downloadable as CSV or JSON under CC BY 4.0.

Design approach assumptions: the 95°F outdoor dry-bulb design point is the AHRI Standard 210/240 cooling rating condition. The 17°F evaporator approach (indoor WB to saturated suction) and the condenser approach (outdoor DB to saturated condensing) are residential design rules of thumb, not chart values. The condenser approach runs 15–25°F; this chart uses the 25°F high end, and high-efficiency units run nearer the 15°F low end. Actual approaches vary with equipment age, coil sizing, and airflow.

Charging procedure references: ASHRAE Handbook—Refrigeration (2022), “Equipment and System Dehydrating, Charging, and Testing”, and the EPA Section 608 certification handbook for refrigerant handling requirements.

What this page is not:not a substitute for the specific equipment's installation manual or data-plate-stamped charging instructions. When the OEM chart for the unit being serviced is available (typically on a sticker inside the access panel or in the installation manual PDF), use that chart instead — it's tuned to that specific coil, orifice, and system design.

PT data source: CoolProp 7.2.0 mixture model: R-32/R-125, 50/50% by mass. Values are checked against the R-410A saturation envelope by an automated anchor-value check.

Related tools and references

Superheat calculator

Compute SH from suction PSIG + suction-line temp for any refrigerant.

Subcooling calculator

TXV charging via subcooling — the modern Carrier path.

Combined PT/SH/SC calculator

Both sides at once with pattern-matching diagnostic banner.

R-410A reference page

Full PT table, properties, regulatory status, downloads.

High head pressure causes

Diagnostic decision tree for high-side problems.

SH & SC fundamentals

Conceptual framework: what these numbers mean and why.

R-410A charging chart (universal)

Two-method: TXV subcooling and fixed-orifice superheat.

R-410A superheat chart

Full target-superheat matrix (14 × 13) with the formula.