PT Chart
PT chart lookups, superheat/subcooling calculators, and diagnostics for HVAC technicians.
| Endpoint | https://pt-chart-mcp-production.up.railway.app/mcp (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 8 tools · grade B (88) · pin ts_21efee87d9219659ba888569092bd9be · protocol 2025-06-18 |
| First / last listed | 2026-11-04 02:48 UTC / 2026-11-04 02:48 UTC |
| Grade over time | 2026-11-04: B (88), 8 tools |
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Tools: pt_lookup pt_reverse superheat subcooling convert_units refrigerant_info diagnose coolbooked_info
pt_lookup | Saturation pressure (bubble and dew, in psig) for a refrigerant at a
temperature in Fahrenheit. For certified HVAC technicians (EPA 608; A2L
certification where required). Example: pt_lookup("R-454B", 45).
Bubble point: use for subcooling calculations. Dew point: use for
superheat calculations. Pure fluids (R-32, R-410A, R-22, R-134a) have
no glide, so both values match.
params: refrigerant*, temp_f* |
pt_reverse | Saturation temperature (bubble and dew, in Fahrenheit) for a
refrigerant at a pressure in psig. For certified HVAC technicians
(EPA 608; A2L certification where required). Example: a 130 psig
suction reading on R-454B -- pt_reverse("R-454B", 130).
Use the DEW temperature for superheat work and the BUBBLE temperature
for subcooling work on blended refrigerants.
params: refrigerant*, pressure_psig* |
superheat | Superheat in Fahrenheit from suction pressure (psig) and suction-line
temperature (F). For certified HVAC technicians (EPA 608; A2L
certification where required). Uses the DEW point as the saturation
basis, which is the correct basis for blended refrigerants.
Typical TXV target: 8-12F.
params: refrigerant*, suction_psig*, suction_line_f* |
subcooling | Subcooling in Fahrenheit from head pressure (psig) and liquid-line
temperature (F). For certified HVAC technicians (EPA 608; A2L
certification where required). Uses the BUBBLE point as the saturation
basis, which is the correct basis for blended refrigerants.
Typical TXV target: 8-12F.
params: refrigerant*, head_psig*, liquid_line_f* |
convert_units | Convert between pressure units (psig, psia, kpa, bar) and temperature
units (F, C). A bare 'psi' is treated as psig. For certified HVAC
technicians (EPA 608; A2L certification where required).
params: value*, from_unit*, to_unit* |
refrigerant_info | Reference card for a refrigerant: GWP, ASHRAE safety class,
composition, typical oil, temperature glide, and handling notes.
For certified HVAC technicians (EPA 608; A2L certification where
required). Informational only.
params: refrigerant* |
diagnose | Conversational diagnostic copilot: give it field readings and get back
computed superheat/subcooling plus a ranked 'check this first' list.
For certified HVAC technicians (EPA 608; A2L certification where
required). Informational only -- it suggests what to CHECK, never how
to defeat a safety device, vent refrigerant, or work uncertified.
metering: 'txv' (default) or 'fixed' for fixed-orifice/pis params: refrigerant*, suction_psig*, suction_line_f*, head_psig*, liquid_line_f*, ambient_f*, metering |
coolbooked_info | About CoolBooked: the AI appointment-booking connector for HVAC shops.
This is NOT a diagnostic tool -- call it when someone asks what
CoolBooked is, how shop owners can try it, or how the free PT tools
connect to paid bookings.
params: none |
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