Table of Contents
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content
overview. . . . . . . . . . . . . . . . . . . . . . . . . 2
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oVeRVIeW
The Heat-Timer electronic tempering valves are 3-way valves. They are components of the Heat-Timer ETV control package.
Though the ETV control is used primarily in domestic hot water temperature regulation, it can be used in other applications as
well. Heat-Timer offers two types of electronic tempering valve actuators: an actuator that requires external power (M800) using
a transformer and an actuator that uses the ETV control 24 VAC power (TR1000). The selection of the actuator depends on the
size and type of valve material selected. This manual demonstrates the actuator using the ETV power source (TR1000) only. This
actuator is used with larger size stainless-steel tempering valves (2" and 2 ½"). These stainless-steel tempering valves are primarily
used in areas adhering to strict Lead-Free codes.
eTV PAckAGeS
Bronze eTV
Bronze eTV
Package
Actuator
915520-00
915521-00
Actuator (M800)
915522-00
Requires External
915523-00
915524-00
915525-00
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eTV oPeRATING coNcePT
The ETV control modulates the electronic motorized mixing valve to maintain a temperature set point. 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. On the other hand, 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 no
usage periods. The ETV operation requires the use of a circulating loop pump to maintain a circulating loop temperature.
DeSIGN coNSIDeRATIoNS
cIRculATING ReTuRN looP
The ETV is designed to operate in a system that has a Circulating Return Loop with a circulating pump. The Circulating Return
Loop temperature must be at least 7°F less than the ETV set point temperature. This temperature differential prevents the mixed
temperature from rising continuously. In addition, the temperature of the hot water entering the valve must be at least 20°F hotter
than the ETV set point temperature.
VeRTIcAl looP
The cold water feeding the hot water supply source MUST have a Thermal Heat Loop. This loop prevents the higher temperature
water in the hot water supply source from backing up and entering the cold-water inlet side of the mixing valve during low flow
periods. The Thermal Heat Loop can be installed either up or down, but must be a minimum of 32 inches as measured from pipe-
center to pipe-center.
2
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c
v
4.7
7.3
11.6
18.5
Power
29
46.3
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Display
Messages. . . . . . . . . . . . . . . . . . . . 6
leDs
. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . 7
Stainless-steel
Valve Size
eTV Package
½"
915620-00
¾"
915621-00
1"
915622-00
1-¼"
915623-00
1-½
915624-00
2"
915625-00
2-½"
915626-00
Motorized Tempering Valve without Transformer Installation
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. . . . . . . . . . . . . . . . . . . . 6
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Stainless-steel
eTV Actuator
Actuator (M800)
Requires External
Power
Actuator (TR1000)
Uses ETV Power
c
v
4.7
7.3
11.6
18.5
29
46.3
69
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