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When your thermostat calls for heat, the system opens the gas valve to send fuel to the ignition source and burners. It also shuts off fuel flow when the heating cycle finishes or if a safety switch opens.
Specifications
- Part number: 36H64-463
- Brand: Copeland
- Part type: Gas valve assembly
- Coil voltage: 24 V
- Dimensions: 3/4 in
- Gas type: Liquid Propane/Natural Gas
- Ignition: HSI/DSI/Intermittent/Proven Pilot
- 36C76-406
- 36C76-420
- Gas type: natural gas or propane, as listed
- Ignition: same type as your furnace
- Pipe size and BTU: same pipe size, rated for your furnace
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How the Gas Valve Operates
A gas valve assembly acts as an automatic gate for heating fuel. During a normal heating sequence, your furnace control board sends an electrical signal to open the valve.
Fuel travels through the valve body to the burners, where it is lit by the ignition system. If the furnace loses power or a safety sensor detects a fault, the valve automatically closes to keep fuel from escaping.
Understanding the 36H64-463 Specifications
Every gas valve is built with specific ratings to match the system it serves. You must verify these specs against your old valve before planning a repair.
- Coil voltage: 24 V
- Dimensions: 3/4 in
- Gas type: Liquid Propane/Natural Gas
- Ignition: HSI/DSI/Intermittent/Proven Pilot
Confirming a Replacement Match
A replacement valve must match your furnace requirements precisely to run safely. Never attempt to adapt a valve that does not meet the basic criteria.
- Gas type: natural gas or propane, as listed.
- Ignition: same type as your furnace.
- Pipe size and BTU: same pipe size, rated for your furnace.
- Replacement numbers: verify your old valve matches this part number or one of its listed replacement numbers.
Replacement Steps and Safety
Working on gas appliances requires careful preparation. Moving wiring and handling fuel pipes can create dangerous hazards if done incorrectly.
- Turn off the electrical power to the furnace at the circuit breaker and test for power.
- Shut off the manual gas supply valve on the pipe leading to the furnace.
- Take a photo of every wire before removing a part. Move wires one at a time to the same spots on the new part.
- Disconnect the gas piping, install the matching valve, check for gas leaks, and set the correct gas pressure.
Read your old part
- Locate the manufacturer label on the side or top of your old gas valve.
- Find the model or part number printed directly on the metal casing or sticker.
- Check if the number reads 36H64-463.
- If it shows a different number, check if it is listed as replacing 36C76-406 or 36C76-420.
- Verify the gas pipe size matches the 3/4 in dimensions and your furnace uses a compatible ignition type.
When to call a pro
Gas valve work means opening gas lines and setting gas pressure. A licensed tech should do it. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What parts does the 36H64-463 replace?
The 36H64-463 replaces part numbers 36C76-406 and 36C76-420. Always check the label on your existing valve to confirm one of these numbers matches.
What coil voltage does this gas valve use?
This valve assembly uses a 24 V coil voltage. Most home thermostats and control boards send a 24 V control signal from a transformer to operate it.
What should I do if I smell gas during a repair?
If you smell gas, do not touch any switch or phone inside the home. Leave the house immediately and call your gas company from outside.
Can this valve be used with liquid propane?
The specifications list the gas type as Liquid Propane/Natural Gas. Gas valve work requires setting the correct gas pressure, so a licensed tech should handle the setup.
Related part numbers
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- 327972756Gas Valve, CarrierSame part type
- 00-420560-00001Gas Valve, Vulcan HartSame part type
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Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.