Tempstar Low Pressure Switch for TCH648GKA200 — Refrigerant Safety | Ships Today
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Overview
This OEM low-pressure switch (part #1184655) is the loss-of-charge safety control on your Tempstar TCH648GKA200. Wired into the 24V control circuit, it monitors suction-side refrigerant pressure and opens the circuit to shut down the compressor if pressure drops below a safe threshold — protecting the compressor from running on a low or lost charge, which causes overheating and slugging damage. The switch closes again automatically once normal pressure is restored. A faulty switch typically causes nuisance lockouts where the compressor short-cycles or refuses to start even though the system is properly charged, or — if stuck closed — fails to protect the compressor during a real refrigerant loss.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1184655 |
| Type | Low / Loss-of-Charge Pressure Switch |
| Brand | Tempstar |
| Function | Suction-side compressor safety cutout (auto-reset) |
| Circuit | 24V control |
| Fitment | OEM |
Compatibility
Direct-fit replacement for the Tempstar TCH648GKA200 condensing unit. The same low-pressure safety switch is used across matching ICP-family Heil, Comfortmaker, and Tempstar outdoor units. Confirm the cut-out/cut-in pressure settings and fitting type against your original switch before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and outdoor disconnect. Verify zero voltage at the control wiring with a multimeter.
- Access — Remove the condensing unit service panel to reach the switch on the suction line.
- Document — Photograph the two 24V control leads before disconnecting them.
- Remove — Disconnect the control leads, then unscrew the switch from its Schrader-style port (a self-sealing valve preserves the charge).
- Install — Thread the new switch onto the port snugly, then reconnect the 24V leads as photographed.
- Test — Restore power and confirm the switch is closed under normal charge and the compressor starts on a cooling call.
Signs You Need a Replacement
- Compressor short-cycles or locks out despite a correct refrigerant charge
- Unit refuses to start with no other fault present
- Switch fails a continuity test at normal operating pressure
- Compressor runs on low charge because the switch is stuck closed
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days