Installation Instructions

MTU Instruction
for STAR Submetering MTUs with Pulse Adapters
Step 3 – Connect the RED and BLACK
leads from the MTU across (in parallel
with) the 24 VAC control input to the gas
valve. On most gas valves, these
connections can be made at the terminals
on the gas valve solenoid.
● The VIOLET lead is the positive
side and must be connected to the
RED wire of the MTU Input Cable.
● The RED lead of the thermocouple
is the negative side and must be
connected to the BLACK wire of
the MTU input cable.
Step 4 – Program the MTU using the
MTU Programmer as outlined in the
Programming section of this document.
Typical Hot Water Heater
Application
Step 5 - Return the furnace setting to
"Run".
This procedure covers a typical
installation of a temperature sensing
pulse adapter on a gas hot water heater.
Connecting Temperature
Sensing (Type T) Inputs
Step 1 - Turn the hot water heater setting
to "Pilot" so that the heater will not
operate during the installation process.
Temperature Sensing (Type T) inputs are
provided with a two wire connection
designed to be directly connected to a
Type E thermocouple that is supplied with
the temperature sensing MTU. When the
thermocouple reaches a temperature of
110
◦
- 130
◦
C (230
◦
- 265
◦
F), the MTU will
begin pulsing and recording usage.
Step 2 - Insert the copper thermocouple
sleeve into the space under the draft-
inducer cone at the top of the water
heater. Position the tip of the
thermocouple INTO the center of the flue
as shown below. ( ½ to ¾ of an inch)
By convention, Type E thermocouples are
supplied with two color-coded leads.
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