ICP 40VA Transformer for WJA336000K000B1 — 208/230V to 24V | Ships Today
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Overview
This OEM transformer kit (part number 1173691) for the ICP/Heil/Tempstar model WJA336000K000B1 steps 208/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, gas valve, and control board. Rated at 40VA, it supplies the low-voltage circuit for the entire system. The matching 24V barrier (part number 1176032) is included to insulate and protect the secondary terminals. When a transformer fails — usually from a shorted control circuit, lightning surge, or age — the system loses all 24V control power: the thermostat goes blank, the contactor will not pull in, and nothing energizes even though line voltage is present. A blown internal fuse or a burnt-out winding are the most common failure modes.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1173691 (transformer), 1176032 (24V barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fitment | OEM Replacement |
Compatibility
Direct OEM replacement for ICP, Heil, and Tempstar model WJA336000K000B1, and shared across comparable Comfortmaker and Day & Night equipment using a 208/230V primary, 40VA control circuit. Confirm primary/secondary voltages and the 40VA rating against your existing transformer before installing.
Installation Guide
- Safety First — Disconnect power and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the control-box service panel.
- Document — Photograph the primary and secondary leads before disconnecting.
- Remove — Disconnect the line-voltage primary and 24V secondary leads, then unbolt the old transformer and barrier.
- Install — Mount the new transformer and 24V barrier, matching the correct primary tap (208 vs 230V), and reconnect per your photo.
- Test — Restore power and confirm a steady 24V reading across the secondary terminals.
Signs You Need a Replacement
- No 24V control power — thermostat blank and contactor will not engage.
- No measurable voltage across the secondary terminals.
- Burnt smell, melted casing, or discolored windings.
- Repeatedly blown low-voltage fuse after a control-circuit short.
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