059305–00 REV. E
HEAT-TIMER CORP.
|
5
02 DETAILED OPERATION
OVERVIEW
The ETV Platinum Plus (Electronic Tempering Valve) is a hot water temperature control capable of operating one or more electronic
motorized mixing valves to regulate the system water temperature. The electronic mixing valves are controlled using any of its
voltages or current output modulation signals. Its modulation PID is designed to respond quickly, which makes it suitable for
domestic hot water applications.
The ETV Platinum Plus consists of four primary components:
• The ETV Platinum Plus control
• The electronic motorized Actuator
• The 3-way mixing valve
• An immersion temperature sensor
If applicable for added protection, the ETV Platinum contains a power loss capacitor which will close the hot water supply to the
mixing valve on a loss of power. The ETV Platinum Plus control can also be configured to close the hot water supply to the mixing
valve if the mixed outlet temperature exceeds the Alarm Limit. It does that by operating a HTLV (High Temp Limit Valve) mounted on
the hot water supply.
ETV OPERATING CONCEPT
The ETV Platinum Plus control modulates the electronic motorized mixing valve to maintain a temperature setpoint. It does that
by mixing two different water temperatures from two different sources; a hot water source and a cold-water source. The hot water
source can be a hot water boiler, a hot water coil in a steam boiler, or a hot water storage tank. The cold water comes from the city
water system. The cold water inlet is joined with the circulating loop return pipe to help maintain flow in the valve during periods of
no usage. The ETV Platinum Plus operation requires the use of a circulating loop pump to maintain the loop temperature.
To save on energy, the ETV Platinum Plus provides a 7-day schedule to help reduce the water temperature during periods of
low usage.
HTLV (HIGH TEMP LIMIT VALVE) OPERATING CONCEPT
In addition to maintaining the mixed output setpoint, the ETV Platinum Plus helps protect the system from excessive water
temperatures. It does that by closing a HTLV (High Temp Limit Valve) feeding the mixing valve’s hot water. When the mixed outlet
exceeds the alarming temperature setpoint (See “HTLV Setpoint” on page 49) for the delayed period (See “HTLV Trigger Delay” on
page 49), the control closes the HTLV (High Temp Limit Valve) blocking all hot water flow to the mixing valve and triggers an alarm.
ETV + HTLV OPERATING CONCEPT
The ETV + HTLV mode combines both the ETV and HTLV modes. In this mode, the ETV Platinum Plus controls the valve to maintain
temperature, and monitors the outlet temperature to ensure the specified temperature is not exceeded.
To Next Page
Loading...
