Tempstar Low Pressure Switch for TCH648GKA100 — Refrigerant Safety | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This OEM low pressure switch (part number 1184655) is a refrigerant safety control that protects the compressor in your Tempstar TCH648GKA100. Wired into the 24V control circuit, it opens when suction-side refrigerant pressure drops below a safe threshold — typically from a loss-of-charge leak, a blocked metering device, or extreme low-ambient operation — and interrupts the call to the contactor so the compressor cannot run dry. When this switch fails or stays open, the outdoor unit short-cycles or refuses to start, even though the thermostat is calling for cooling. A switch stuck closed defeats the safety entirely and exposes the compressor to damage.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1184655 |
| Type | Low Pressure Switch (Loss-of-Charge Safety) |
| Brand | Tempstar |
| Circuit | 24V Control |
| Function | Opens on low suction pressure |
| Fitment | OEM |
Compatibility
Direct OEM replacement for the Tempstar TCH648GKA100 condensing unit. This low pressure switch is shared across ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) using the same refrigerant safety platform. Confirm the part number and the connection type (Schrader port vs. brazed) against your existing switch before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter on the control wiring.
- Access — Remove the service panel to expose the pressure switch on the suction line and its low-voltage leads.
- Document — Photograph the two control wires and the switch's mounting/port location.
- Remove — Disconnect the 24V leads. For a Schrader-port switch, unscrew it (the port self-seals); for a brazed switch, recover refrigerant before removal.
- Install — Thread or braze in the new switch, reconnect the 24V leads per your photo, and confirm the port seats fully.
- Test — Restore power, verify the switch is closed at normal charge, and confirm the unit starts and runs on a cooling call.
Signs You Need a Replacement
- Outdoor unit won't start despite a cooling call and good charge
- Compressor short-cycles on the low-pressure safety
- Switch fails to open during an actual loss-of-charge event
- Continuity test shows the switch stuck open or stuck closed
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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