1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the AP15255A-1 Upgraded OEM Water Heater Gas Valve Thermostat. This component is designed as a direct replacement part for specific Delta water heater models. Please read this manual thoroughly before proceeding with any installation or operation.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Always shut off the gas supply to the water heater before performing any service or maintenance.
- Turn off electrical power to the water heater before servicing.
- Gas valve and thermostat replacement should only be performed by a qualified service technician.
- Ensure proper ventilation when working with gas appliances.
- Check for gas leaks after installation using a non-corrosive leak detection solution.
- High water temperature increases the risk of scalding. Adjust thermostat settings carefully.
3. Product Overview
The AP15255A-1 is an upgraded OEM replacement gas valve thermostat for water heaters. This component is crucial for regulating the gas flow to the burner and controlling the water temperature within the tank. It functions as a low voltage control, typically 24 VAC, allowing gas into the combustion chamber and acting as an adjustable regulator to ensure proper gas pressure for combustion. It also includes a manual shut-off feature.
Figure 1: AP15255A-1 Delta Upgraded OEM Water Heater Gas Valve Thermostat. This image displays the gas valve thermostat, featuring a blue housing, a yellow 'OFF' button on top, a copper temperature probe extending from the side, and a red cap covering an inlet port. A separate black wire is also visible.
4. Setup and Installation
Installation of a gas valve thermostat requires specialized knowledge and tools. It is strongly recommended that installation be performed by a qualified and licensed professional to ensure safety and proper function.
General Installation Steps (Professional Installation Recommended):
- Preparation: Shut off the gas supply to the water heater at the main valve and turn off the electrical power. Drain the water heater tank.
- Removal of Old Unit: Disconnect all gas lines, electrical connections, and the temperature probe from the existing gas valve thermostat. Carefully remove the old unit.
- Installation of New Unit: Install the new AP15255A-1 gas valve thermostat, ensuring all connections are secure and properly sealed according to manufacturer specifications and local codes. This includes gas lines, electrical wiring (low voltage, typically 24 VAC), and the temperature probe.
- Leak Check: After installation, slowly turn on the gas supply and check all gas connections for leaks using an approved leak detection solution.
- Refill and Power On: Refill the water heater tank, then restore electrical power and light the pilot (if applicable) according to the water heater's specific instructions.
- Functionality Test: Verify proper operation and temperature control.
5. Operating Instructions
The AP15255A-1 gas valve thermostat controls the water temperature. Adjustments should be made carefully.
- Temperature Adjustment: Locate the temperature dial or control on the gas valve thermostat. Rotate the dial to the desired temperature setting. Refer to your water heater's specific instructions for recommended temperature ranges.
- Manual Shut-Off: The unit includes a manual shut-off. In case of emergency or for servicing, turn the control to the "OFF" position.
- Pilot Light (if applicable): If your water heater uses a pilot light, follow the water heater manufacturer's instructions for lighting the pilot after any gas supply interruption or manual shut-off.
Note: Higher temperature settings increase the risk of scalding. It is recommended to set the water heater to a temperature that balances comfort and safety, typically around 120°F (49°C).
6. Maintenance
The AP15255A-1 gas valve thermostat is designed for reliable operation with minimal maintenance. However, periodic checks of the overall water heater system are recommended.
- Annual Inspection: Have a qualified technician inspect your water heater system annually, including the gas valve and thermostat, for proper operation and any signs of wear or damage.
- Gas Leak Checks: Periodically check gas connections for leaks using a non-corrosive leak detection solution.
- Cleanliness: Ensure the area around the water heater and gas valve is kept clear of debris and flammable materials.
7. Troubleshooting
If you experience issues with your water heater's temperature control or gas supply, consider the following general troubleshooting steps. For complex issues, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water or insufficient hot water |
|
|
| Water too hot | Thermostat set too high | Adjust thermostat to a lower setting. |
| Gas odor | Gas leak | Immediately shut off gas supply, ventilate area, and contact emergency services or a qualified technician. Do not operate any electrical switches or create sparks. |
| Gas valve not holding (e.g., O.C.M. not holding) | Internal component failure | This indicates a faulty gas valve. Professional replacement is required. |
8. Specifications
- Model: AP15255A-1
- Part Number: OEM Rplm Delta # AP15255A-1
- Brand: OEM Rplm for Delta
- Manufacturer: Delta
- Item Weight: 2.66 pounds
- Product Dimensions: 6 x 6 x 6 inches
- Batteries Required: No
- Voltage: Low voltage control (typically 24 VAC)
9. Warranty and Support
As an OEM replacement part, warranty coverage for the AP15255A-1 gas valve thermostat may vary. Please refer to the specific warranty terms provided by the seller or the original water heater manufacturer. For technical support or assistance with installation, it is recommended to contact a qualified and licensed HVAC or plumbing professional.
For further inquiries regarding this product, please contact your point of purchase.
