Tempstar Low Pressure Switch Assembly for T4H736GKD200 — Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This is a genuine OEM low pressure switch assembly (part number 1177594) for the Tempstar T4H736GKD200. The low pressure switch is a safety device wired into the 24V control circuit that monitors suction-side refrigerant pressure. If pressure drops below its trip point — from a refrigerant leak, loss of charge, a restricted metering device, or low airflow — the switch opens and shuts down the compressor to protect it from running dry or slugging. Symptoms of a failed or tripped switch include a compressor that will not start or that short-cycles, a control board logging a low-pressure lockout, or the system shutting off shortly after starting. A switch can also fail open from contact fatigue even when charge is fine. Replacing it with the correct OEM assembly, after confirming the actual refrigerant charge, restores proper compressor protection.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1177594 |
| Type | Low Pressure Switch Assembly |
| Brand | Tempstar |
| Circuit | 24V Control Safety |
| Function | Loss-of-Charge / Low-Pressure Compressor Protection |
| Fits Model | T4H736GKD200 |
Compatibility
Factory-spec for the Tempstar T4H736GKD200 and shared ICP / Heil condensing units using the same low pressure switch and connection fitting. Verify the trip rating and fitting style against the failed part before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser service panel to reach the switch on the suction line.
- Document — Photograph the two control wires and the switch fitting before removal.
- Remove — Disconnect the control leads, then unthread the switch from its Schrader-style fitting (most replace without recovering refrigerant).
- Install — Thread on the new switch with the supplied gasket/seal and reconnect the control leads per your photo.
- Test — Restore power, confirm the switch is closed at normal pressure, and verify the compressor starts and stays running.
Signs You Need a Replacement
- Compressor will not start or short-cycles on a pressure fault
- Control board shows a low-pressure lockout
- System shuts down shortly after starting
- Switch reads open on the multimeter with a confirmed-good refrigerant charge
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