Overview
Temperature switch, 285 °F (approximately 141 °C), Nason, 3/8 inch NPT. HydraMaster part number 000-149-027, listed in the parts lists as Sensor, 285 °F Nason – 3/8" NPT and cross-referenced by Bridgepoint as PHY149-017.
This is the high-limit switch — the one that cuts the machine out when solution temperature reaches a point it should never reach in normal use. It is a protection device, not a control.
What it fits
Named directly in the machine parts lists of:
- HydraMaster Boxxer 421 — by-pass valve assembly, item 15
- HydraMaster Boxxer 318HP — item 14
- HydraMaster Boxxer 323HP — Hi-PSI manifold assembly, item 11
- HydraMaster Titan 325 — item 17
Also listed in the Bridgepoint temperature control cross-reference for:
- HydraMaster SpitFire 4.0
- HydraMaster Crossfire 4.4
- HydraMaster MAXX 550
That is seven machines from published documentation — one of the most widely used temperature switches in the range.
Specifications
- Set point: 285 °F (approximately 141 °C)
- Thread: 3/8 inch NPT
- Manufacturer: Nason
- Bridgepoint cross-reference: PHY149-017
Important — the set point is the part
Several HydraMaster temperature switches look identical and are not interchangeable:
- 149-0111 — 185 °F — SpitFire 4.0, Crossfire 4.2, old style
- 149-021 — 218 °F — CDS 4.2, 4.7, 4.6, 4.8
- 149-0181 — 235 °F — Crossfire 4.4
- 149-505 — 240 °F — MAXX 450D and 470D
- 149-013 — 245 °F — Crossfire 3.7 and 4.2
- 149-027 — 285 °F — this switch
Fitting a higher-rated switch to gain running temperature is not a modification, it is the removal of a safety device. Read the temperature marked on the switch you are replacing.
Related parts in the same assembly
On most machines this switch sits alongside temperature sender 149-039 and RTD sensor 149-540, which is mounted with compression fitting 052-587. The three do different jobs: the sender drives the gauge, the RTD drives the control, and this switch is the backstop.
Fitting advice
Use the correct sealant on the 3/8 inch NPT thread and check the assembly drawing for your machine — HydraMaster specify sealant on these manifold drawings explicitly.
Do not over-tighten it into a brass manifold.
Photograph the wiring before you disconnect it.
Frequently asked questions
My machine keeps cutting out. Should I fit a higher switch?
No. Find out why it is reaching 285 °F. A high-limit switch tripping is the machine telling you something — commonly a restriction in the solution circuit, a failed by-pass, or a diverter fault.
Is it adjustable?
No. Fixed set point.
Is it the same as the temperature sender?
No. The sender (149-039) drives the gauge. This is a switch that opens or closes a circuit at a fixed temperature.
Is it the same as the Bridgepoint part?
Yes — PHY149-017.
My machine is not on the list. Will it fit?
Ask us. The thread is 3/8 inch NPT and the switch is widely used, but we are not going to claim fitment we have not verified.
If your high-limit switch is tripping, tell us the machine and the circumstances — we would rather help you find the cause than sell you a switch that is doing its job correctly.
