Tempstar Low Pressure Switch Assembly for T4H461GKD100 — OEM 1177594 | Ships Today
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Overview
The Tempstar low pressure switch assembly (OEM #1177594) is a refrigerant-side safety control on your T4H461GKD100 heat pump. It senses suction-line pressure and opens the control circuit to shut down the compressor whenever pressure drops below a safe threshold — protecting the compressor from running on a low charge, a restricted line, or a winter loss-of-charge condition. When this switch fails or sticks, the result is either nuisance lockouts (system won't run even when charge is fine) or, worse, a compressor allowed to run dry. This genuine OEM assembly is pre-calibrated to the correct cut-out and cut-in pressures for your unit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177594 |
| Type | Low Pressure Switch Assembly |
| Brand | Tempstar (ICP / Heil) |
| Function | Loss-of-charge / low-pressure cutout |
| Application | Heat Pump Refrigerant Circuit |
| Fits Model | T4H461GKD100 |
Compatibility
Built for the Tempstar T4H461GKD100 heat pump and other ICP-family condensers (Heil, Comfortmaker, Arcoaire) sharing the same refrigerant safety circuit. Confirm OEM number 1177594 and the fitting/connection type against your original switch before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control/service panel.
- Document — Photograph the switch wiring and its plumbing connection point.
- Remove — Disconnect the electrical leads, then unthread or unclip the switch from its Schrader/port fitting (most assemblies seal on a valve core, so refrigerant recovery is usually not required — confirm for your fitting type).
- Install — Thread on the new switch with the supplied gasket/seal, reconnect the leads per your photo, and check for leaks.
- Test — Restore power and verify the system runs and that the switch is not holding the circuit open.
Signs You Need a Replacement
- Compressor won't start and control board reports low-pressure lockout
- Nuisance trips with a verified-good refrigerant charge
- Switch fails to open on an actual low-charge condition
- Corroded terminals or a cracked/leaking switch body
Shipping & Returns
Ships same day on orders placed 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