Amtrol SX-90V EXTROL Expansion Tank User Manual

Introduction

This manual provides essential information for the proper installation, operation, and maintenance of your Amtrol SX-90V EXTROL Expansion Tank. Please read these instructions thoroughly before proceeding with installation or use to ensure safe and efficient operation. This expansion tank is designed for use in closed hydronic heating and cooling systems.

Safety Information

WARNING: Improper installation or maintenance can lead to property damage, serious injury, or death. Installation and service must be performed by a qualified professional in accordance with all local codes and regulations.

• Always depressurize the system and allow it to cool before attempting any service or maintenance.
• Wear appropriate personal protective equipment (PPE) during installation and service.
• Ensure the tank is securely mounted to prevent movement or damage.
• Do not exceed the maximum working pressure or operating temperature specified for this unit.

Product Overview

The Amtrol SX-90V EXTROL Expansion Tank is a critical component in closed hydronic heating and cooling systems. It accommodates the expansion and contraction of system fluid due to temperature changes, maintaining stable system pressure and preventing damage to system components.

Image: The Amtrol SX-90V EXTROL Expansion Tank, a gray cylindrical pressure vessel with a brass air valve at the top, designed for hydronic systems.

Key Features:

• Designed for closed hydronic heating and cooling systems.
• Factory pre-charged to 12 PSIG.
• Maximum working pressure: 100 PSIG.
• Maximum operating temperature: 240°F.

Setup and Installation

Installation of the Amtrol SX-90V EXTROL Expansion Tank should only be performed by a qualified heating, ventilation, and air conditioning (HVAC) professional or licensed plumber.

Installation Steps:

1. System Preparation: Ensure the hydronic system is depressurized and drained as necessary.
2. Pre-charge Adjustment: The tank is factory pre-charged to 12 PSIG. Before installation, the pre-charge pressure must be adjusted to match the minimum operating pressure of the system at the tank's location. Use an accurate pressure gauge to check and adjust the air pre-charge through the Schrader valve at the top of the tank.
3. Mounting: Securely mount the expansion tank in an accessible location, typically on the return side of the system near the boiler or chiller. Ensure adequate support for the tank's weight when full.
4. System Connection: Connect the tank to the hydronic system using the 1-1/4 inch system coupling. Use appropriate pipe sealant and ensure all connections are leak-free.
5. System Fill and Test: Slowly refill the hydronic system, bleeding air as necessary. Check for leaks and verify system pressure.

Operating Instructions

Once properly installed and the system is operational, the Amtrol SX-90V EXTROL Expansion Tank functions automatically to manage system pressure. It absorbs the increased volume of water as it heats up and returns water to the system as it cools, maintaining a stable pressure range.

Normal Operation:

• The tank's internal diaphragm separates the system fluid from the air pre-charge.
• As system water heats and expands, it enters the tank, compressing the air cushion.
• As system water cools and contracts, the compressed air pushes water back into the system.
• The system pressure should remain within the acceptable operating range, preventing the pressure relief valve from opening frequently.

Maintenance

Regular maintenance helps ensure the longevity and proper function of your expansion tank and hydronic system. It is recommended that a qualified professional perform annual inspections.

Maintenance Checks:

1. Visual Inspection: Check the tank for any signs of corrosion, leaks, or physical damage.
2. Pre-charge Verification: Periodically check the air pre-charge pressure. This should be done when the system is depressurized and cool. If the pressure is low, recharge the tank to the appropriate system minimum operating pressure.
3. System Pressure Monitoring: Observe the system pressure gauge during operation. Fluctuations outside the normal range may indicate an issue with the expansion tank or other system components.

Troubleshooting

If you experience issues with your hydronic system, the expansion tank may be a contributing factor. Consult a qualified professional for diagnosis and repair.

Common Issues and Potential Causes:

• Frequent Pressure Relief Valve Discharge:
  • Cause: Insufficient air pre-charge in the expansion tank, waterlogged tank, or undersized tank.
  • Action: Check and adjust pre-charge. If waterlogged, the tank may need replacement.
• Low System Pressure:
  • Cause: System leak, low fill pressure, or a completely failed expansion tank (no air charge).
  • Action: Check for leaks, verify fill pressure, and inspect expansion tank pre-charge.
• Tank Leaking:
  • Cause: Physical damage to the tank or connections.
  • Action: Isolate the tank, depressurize, and inspect for leaks. Repair or replace as necessary.

Specifications

Warranty and Support

For warranty information, technical support, or to locate an authorized service provider, please refer to the official Amtrol website or contact Amtrol customer service directly. Keep your purchase receipt for warranty claims.

Amtrol Contact Information: Please visit www.amtrol.com for the most current contact details and support resources.