INSTALLATION AND OPERATING INSTRUCTIONS
Astro Express 2 - Hot Water Delivery System
TYPICAL APPLICATIONS
The Armstrong Astro Express 2 hot water delivery system ensures that users have hot
water at the tap when you need it, while helping to conserve water. It’s easy to install,
and does not require special return piping to the water heater.
Equipped with a high performance circulator and adjustable flowrate injection valve,
the Astro Express 2 system is a “one-size-fits-all” solution for virtually any residential
installation. The Astro Express 2 is the ideal solution for existing home retrofit where
recirculation system return line installation is impractical, or new home construction
where dedicated hot water return line installation is cost prohibitive.
HOW IT WORKS
Armstrong Astro Express 2 hot water delivery systems consist of a circulator for water
heater mounting, and a valve for under-sink mounting. In operation, the timer activated
circulator creates differential pressure across the Astro Express LF valve. When the water
at the hot water faucet cools below the Astro Express LF valve low temperature setpoint,
the valve opens, allowing the cooled water to be injected into the cold water line. When
the water reaches the valve high temperature setpoint, the valve closes. The valve is
equipped with a pressure independent flowrate adjustment to maintain the desired
temperature balance. Additionally, the valve is equipped with a check valve to prevent
cold water backflow when the hot water faucet is opened.
INSTALLATION
WARNING:
Installation should only be completed by qualified personnel, in accordance with all applicable codes, and following
generally accepted installation practices.
Ensure the hot and cold water supply is turned off before installation, to avoid personal injury or damage to
property.
Read and understand these instructions thoroughly before beginning the installation.
CAUTION:
Prior to installation flush all piping of any foreign material to prevent pump blockage and prevent damage.
FILE NO.:
10.817
DATE:
Apr. 4, 2011
SUPERSEDES: 10.817
DATE:
Feb. 24, 2010
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