OEM installation guides, wiring diagrams, and technical bulletins for the most common HVAC parts. Updated continuously.
Safety Notice: HVAC installation and repair work involving electrical connections, refrigerant handling, or gas lines must be performed by qualified technicians. Always follow local codes, disconnect power before working, and use proper PPE. Some work requires EPA 608 certification.
⚡ Capacitors
📄
Dual Run Capacitor — Replacement Guide
CAPACITOR · ALL BRANDS · 4 PAGES
INSTALL GUIDE
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Capacitor Testing with a Multimeter
DIAGNOSIS · ALL BRANDS · 2 PAGES
TECH BULLETIN
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Hard Start Kit Installation
CAPACITOR · COMPRESSOR · 3 PAGES
INSTALL GUIDE
🔌 Contactors & Relays
📄
2-Pole Contactor — Replacement & Wiring
CONTACTOR · ALL BRANDS · 3 PAGES
INSTALL GUIDE
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Time-Delay Relay Wiring Reference
RELAY · GENERAL · 2 PAGES
WIRING DIAGRAM
🔥 Ignitors & Flame Sensors
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Hot Surface Ignitor — Universal Replacement
IGNITOR · GOODMAN / CARRIER / TRANE · 5 PAGES
INSTALL GUIDE
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Flame Sensor — Cleaning & Testing
FLAME SENSOR · ALL GAS FURNACES · 2 PAGES
TECH BULLETIN
🌀 Motors & Blowers
📄
Condenser Fan Motor — Replacement Procedure
MOTOR · OUTDOOR UNIT · 4 PAGES
INSTALL GUIDE
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ECM Blower Motor — Replacement & Programming
ECM MOTOR · AIR HANDLER · 6 PAGES
SAFETY CRITICAL
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PSC Blower Motor — Direct Drive Replacement
PSC MOTOR · FURNACE / AIR HANDLER · 3 PAGES
INSTALL GUIDE
🔲 Control Boards & Thermostats
📄
Furnace Control Board — Replacement Guide
CONTROL BOARD · GAS FURNACE · 5 PAGES
SAFETY CRITICAL
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Thermostat Wiring Reference — 5 & 7 Wire
THERMOSTAT · RESIDENTIAL · 3 PAGES
WIRING DIAGRAM
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Gas Valve — Replacement & Leak Testing
GAS VALVE · GAS FURNACE · 4 PAGES
SAFETY CRITICAL
🌬️ Pressure Switches & Limit Controls
📄
Pressure Switch — Diagnosis & Replacement
PRESSURE SWITCH · GAS FURNACE · 4 PAGES
INSTALL GUIDE
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High-Limit Switch — Replacement Procedure
LIMIT SWITCH · GAS FURNACE · 3 PAGES
SAFETY CRITICAL
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