ICP Tubing Pressure Switch for WPG4484130RKB1 — OEM 1178417 | Ships Today
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Overview
This is a genuine OEM tubing-style pressure switch (part number 1178417) for the ICP / Heil / Tempstar WPG4484130RKB1 packaged gas unit. The pressure switch is a safety device that proves correct draft and airflow through the inducer before the control board allows the igniter and gas valve to energize. It uses a sensing tube connected to the inducer housing or vent; when negative pressure reaches the switch set point, the internal diaphragm closes the 24V contacts and the ignition sequence proceeds. If proper pressure is never sensed, the switch keeps the contacts open and locks out the burners to prevent unsafe combustion. Common failure symptoms include the furnace running the inducer but never lighting, short cycling on call for heat, or a control-board fault flash indicating an open or stuck pressure switch.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178417 |
| Type | Tubing / Air-Proving Pressure Switch |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Circuit | Single-pole, normally open |
| Control Voltage | 24V |
| Fitment | OEM replacement |
Compatibility
Designed as a direct OEM replacement for the ICP / Heil / Tempstar WPG4484130RKB1 packaged gas system. ICP-family packaged units share components across the Heil, Tempstar, Comfortmaker, and Arcoaire brands, so always confirm your set point and tubing connection match the original switch before installing.
Installation Guide
- Safety First — Disconnect power at the unit and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service panel to expose the inducer assembly and control board.
- Document — Photograph the wire and tubing routing before disconnecting anything.
- Remove — Pull the two 24V spade terminals, detach the sensing tube, and unscrew the old pressure switch from its bracket.
- Install — Mount the new switch, reconnect the sensing tube fully seated, and reattach the terminals per your photo.
- Test — Restore power, start a heat call, and confirm the inducer proves pressure and the burners light normally.
Signs You Need a Replacement
- Inducer motor runs but burners never ignite.
- Furnace short cycles or locks out on a pressure-switch fault code.
- Switch fails to close even with a clear vent and good draft.
- Cracked sensing tube port or contacts that test open under draft.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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
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