Tempstar Low Pressure Switch for T4H524GKD200 — OEM 1177594 Refrigerant Safety Assembly | Ships Today

Overview

This genuine Tempstar low pressure switch assembly (OEM #1177594) is a refrigerant-side safety control on your T4H524GKD200. It continuously senses suction-line pressure and opens the 24V control circuit if pressure drops too low — a sign of loss of charge, a refrigerant leak, a blocked metering device, or extreme low ambient operation. By shutting down the compressor before it runs starved, the switch prevents overheating and costly compressor failure. A faulty switch can either nuisance-trip and lock out a healthy system or fail closed and remove protection entirely.

Specifications

Compatibility

Designed for the Tempstar T4H524GKD200 and compatible across ICP-family outdoor units (Tempstar, Heil, Comfortmaker, Arcoaire) using this low-pressure safety assembly. Confirm the original part number and refrigerant type before installing.

Installation Guide

1. Safety First — Disconnect power; verify zero voltage with a multimeter. Note that this part connects to the sealed refrigerant system.
2. Access — Remove the outdoor unit service panel.
3. Document — Photograph the switch wiring and mounting before disconnecting.
4. Remove — Disconnect the 24V leads; if the switch is brazed/threaded into the line, recover refrigerant first per EPA guidelines (qualified technician).
5. Install — Fit the new switch, evacuate and recharge the system as required, and reconnect the control leads per your photo.
6. Test — Restore power, run the system, and confirm pressures are normal and the switch is closed during operation.

Signs You Need a Replacement

• Compressor locks out on a low-pressure fault with adequate charge
• Nuisance trips or intermittent no-cool
• Switch fails to open during an actual low-charge condition
• Corroded terminals or a damaged sensing port

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.