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HEAT-TIMER CORP.
059327–00 REV. C
RECIRCULATION PUMP SIZING
For proper operation of the ETS-LT, the assembly must be installed in a system with constant recirculation. The
ETS-LT provides a dedicated recirculation connection.
For optimum valve function, it is recommended that the building recirculation temperature is at least 7°F lower
than the desired setpoint temperature. In addition, it is recommended that the HOT water supplied to the ETV
valve is at least 20°F above the desired setpoint.
The recirculation pump (not provided) must be properly sized for a minimum of 5 gpm.
In systems without a building recirculation line, it is recommended that a flow switch (not provided) is installed.
The flow switch should be located on the MIXED outlet field piping above the ETS-LT assembly. Activation of the
flow switch should be at the lowest potential draw of the system.
Refer to “Wiring the Flow Prove” on page 17 for wiring to the ETV Platinum Plus module for a flow switch (Prove).
Refer to “Flow Switch” on page 27 for proper STARTUP menu settings for installations using a flow switch.
HIGH TEMP LIMIT SAFETY VALVE PIPING
The optional High Temp Limit Safety Valve is typically piped between the hot water source (a storage tank or boiler
coil) and the Hot inlet of the ETV valve.
THERMAL TRAP
A thermal trap must be used to prevent the higher temperature water in the hot water supply source from
migrating up and entering the cold-water inlet side of the mixing valve during low or no demand periods. The
thermal trap can be installed either up or down. However, its drop must be a minimum of 32 inches (81.3cm) as
measured from pipe-center to pipe-center.
In applications where piping a thermal trap is not feasible, or in applications where there is a recirculating pump
between a heating source and storage tank, a check valve may be used
04 INSTALLATION INSTRUCTIONS
WARNING
HEALTH RISK! Any domestic hot water system that does not utilize a constant building recirculation line
poses a potential risk of stagnant water in the system. Stagnant water provides ideal conditions for the
growth of bacteria, such as Legionella.
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