Extrol EX-90 - Water heaters and boilers Amtrol - Free user manual and instructions
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| Product Type | Expansion Tank for Water Heaters and Boilers |
| Brand | Amtrol |
| Model | Extrol EX-90 |
| Tank Capacity | 90 Liters (approx. 24 Gallons) |
| Maximum Working Pressure | 150 psi (10.3 bar) |
| Maximum Temperature | 200°F (93°C) |
| Connection Size | 1 inch NPT |
| Pre-Charge Pressure | 40 psi (2.8 bar) |
| Dimensions (Height) | 24 inches (610 mm) |
| Dimensions (Diameter) | 16 inches (406 mm) |
| Weight | Approximately 30 lbs (13.6 kg) |
| Material | Steel with Epoxy Lining |
| Diaphragm Material | Butyl Rubber |
| Application | Residential Water Heating Systems |
| Installation | Vertical or Horizontal Mount, Cold Water Supply Line |
| Maintenance | Annual Pre-Charge Pressure Check |
| Safety | ASME Rated, Certified to ASSE 1003 |
| Warranty | 5 Years Limited from Date of Manufacture |
| Repairability | Replacement Diaphragm Kit Available |
Frequently Asked Questions - Extrol EX-90 Amtrol
What is the purpose of the Extrol EX-90 expansion tank?
The Extrol EX-90 is designed to absorb excess pressure in a closed-loop water heating system caused by thermal expansion, preventing damage to pipes, valves, and the water heater.
Where should the EX-90 be installed?
Install the expansion tank on the cold water supply line between the shut-off valve and the water heater, typically in a vertical or horizontal position with the connection facing down.
What is the correct pre-charge pressure for the tank?
The pre-charge pressure should be set to match the incoming water pressure. For most residential systems, this is around 40 psi. Adjust using a tire gauge and air pump via the Schrader valve.
How do I check if the expansion tank is working properly?
Tap the tank: a hollow sound indicates proper air charge, while a dull thud suggests waterlogging. Also, check the pre-charge pressure with the system pressure zeroed.
Can the EX-90 be used with glycol systems?
Yes, the butyl rubber diaphragm is compatible with propylene glycol mixtures common in hydronic heating systems. Ensure the system temperature does not exceed 200°F.
What does it mean if water comes out of the air valve?
Water at the Schrader valve indicates a failed diaphragm. The tank must be replaced or the diaphragm kit installed. Do not attempt to add air if water is present.
How often should maintenance be performed?
Annual maintenance is recommended: check the pre-charge pressure, inspect for leaks or corrosion, and verify the tank is not waterlogged.
What is the maximum temperature the tank can handle?
The EX-90 is rated for a maximum continuous temperature of 200°F (93°C). Higher temperatures may damage the diaphragm and void the warranty.
Is a relief valve required with this expansion tank?
Yes, a temperature and pressure relief valve (T&P valve) must always be installed on the water heater per local codes, even with an expansion tank.
What is the warranty period for the Extrol EX-90?
Amtrol provides a 5-year limited warranty from the date of manufacture against defects in materials and workmanship. Register your product online for coverage.
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USER MANUAL Extrol EX-90 Amtrol
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Product information
Brand : Amtrol
Model : Extrol EX-90
Category : Water heaters and boilers