059305–00 REV. E
HEAT-TIMER CORP.
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15
04 INSTALLATION INSTRUCTIONS
BUILDING RECIRCULATING LOOP
For proper operation of the ETV Platinum Plus, the ETV valve must be installed in a system with constant recirculation. The building
recirculation must be piped in a manner that allows recirculating flow to the COLD side of the ETV valve and to the water heating
source. Refer to “Piping Diagrams” on page 36.
The recommended size of the recirculation loop and pump should be as follows:
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.
MULTIPLE/PARALLEL VALVE PIPING
For high volume applications the ETV Platinum Plus control module can modulate two or more valves piped in parallel while
maintaining a single setpoint temperature.
When piping multiple valves in parallel it is very important to ensure:
• The piping manifold is such that all valves receive balanced flows
• All valves should have isolation valves properly piped in a manner to allow for isolating one valve while maintaining operation
of the remaining valves
Refer to “Piping Diagrams” on page 36.
For optimum valve function, ensure 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.
For applications without constant recirculation it is strongly recommended to add a flow switch. For information on using a flow
switch and the option Flow Prove operation see page 6.
ETV VALVE SIZE MINIMUM FLOW
Up to 1" 5 gpm
1 ¼" and 1 ½" 10 gpm
Over 2" 15 gpm
CAUTION
Heat Timer strongly recommends the use of constant recirculation to minimize the risk of stagment water within the
domestic hot water system which promotes the growth of bacteria such as Legionella.
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