Overview
Temperature switch, 235 °F (approximately 113 °C), Nason snap disc. HydraMaster part number 000-149-0181, cross-referenced by Bridgepoint as PHY149-018.
It is a sealed snap-disc thermal switch. There is nothing to adjust and nothing to calibrate — the set point is the part number.
What it fits
Verified from the Bridgepoint parts catalogue temperature control cross-reference:
- HydraMaster Crossfire 4.4
That is the only machine we can name from a published cross-reference. Do not assume it carries to other Crossfire variants — the 3.7 and 4.2 are listed against different switches.
Important — the set point is the part
HydraMaster use several fixed-temperature switches that look identical and are not interchangeable:
- 149-0111 — 185 °F (85 °C) — SpitFire 4.0, Crossfire 4.2, old style
- 149-021 — 218 °F (103 °C) — CDS 4.2, 4.7, 4.6 and 4.8
- 149-0181 — 235 °F (113 °C) — Crossfire 4.4 (this switch)
- 149-505 — 240 °F (116 °C) — MAXX 450D and 470D
- 149-013 — 245 °F (118 °C) — Crossfire 3.7 and 4.2
- 149-027 — 285 °F (141 °C) — SpitFire 4.0, Boxxer 421, Crossfire 4.4, MAXX 550
Note that the Crossfire 4.4 appears against both 235 °F and 285 °F — the two switches do different jobs in the same machine. Read the temperature marked on the switch you are replacing before you order.
Fitting advice
Read the old switch before you remove it. The set point is normally marked on the body and it is the only reliable identification.
Photograph the wiring and note the terminal positions. Some thermal switches are normally open and some normally closed, and getting that wrong leaves the circuit permanently made or permanently broken.
Refit it in the same location with the same sealing arrangement. A switch that is not in proper thermal contact reads late, which defeats the purpose of fitting it.
Frequently asked questions
Will it fit a Crossfire 3.7 or 4.2?
Not according to the cross-reference — those machines are listed against 245 °F switch 149-013 and, on old-style 4.2 machines, the 185 °F switch. Check the marking on your existing switch.
Can I fit a higher-rated switch?
No. The set point is what protects the machine.
Is it adjustable?
No. Fixed set point.
Is Nason the manufacturer?
Yes — Nason is the switch manufacturer. Bridgepoint cross-reference the same part as PHY149-018.
Send us the temperature marked on your existing switch and your machine model and we will confirm the correct part before you order.
