Installation Instructions

MTU Instruction
for STAR Submetering MTUs with Pulse Adapters
Gently shape the copper sleeve on the
thermocouple so that it does not contact
the metal surface of the draft hood or the
top of the hot water tank as shown in the
side view illustration.
Step 3 - Clean the surface area of the hot
water heater under the thermocouple.
Dry thoroughly. Locate and mount the
two pressure sensitive hold-downs in the
cleaned area. Locate one hold-down at
the approximate center of the copper
sleeve and the other at the very end so
that they firmly anchor the thermocouple.
Thread a cable tie through the slot in the
hold-downs to fasten the thermocouple.
If necessary, gently form the copper
sleeve to facilitate mounting while
insuring that the tip of the thermocouple is
in the center of the flue and the copper
sleeve is not in contact with metal
surfaces.
Step 4 - After the thermocouple sleeve is
secure, route the thermocouple wire near
the inlet or outlet water pipe. Use the
third cable tie to secure the thermocouple
wire to the pipe as a strain relief.
Step 5 - Mount the MTU on a wall, joist or
other convenient mounting location using
two screws. Run the cable from the MTU
to the end of the thermocouple wire. Trim
excess MTU cable, as needed. Care
must be taken to protect the cable from
damage by hot surfaces or sharp sheet
metal. Use insulated staples or cable ties
as needed.
Note: Be sure to follow all General
Mounting & Wiring Guidelines outlined in
Publication 471-2000.
Step 6 - Splice the MTU wire to the
thermocouple wire using the two IDCs
provided.
● Connect the VIOLET
thermocouple wire to the RED
MTU wire.
● Connect the RED thermocouple
wire to the BLACK MTU wire.
Do not remove the insulation from either
the MTU wires or the thermocouple wires;
the IDC is designed to pierce the
insulation.
Step 7 – Program the MTU using the
MTU Programmer as outlined in the
Programming section of this document.
Step 8 - Return the hot water heater
setting to "Run".
Typical Burner/Fireplace
Application
This procedure covers a typical
installation of a temperature sensing
pulse adapter on a burner or fireplace.
Step 1 - Set burner or fireplace control so
that the appliance does not come on
during installation.
Step 2 - Fasten thermocouple so that the
tip is near, but not in, the flame when the
gas is burning. Use metal clamps or wire
fasteners to secure the thermocouple.
(NOTE: Clamps or wire fasteners are not
provided by Hexagram. Individual
installation conditions will determine the
type of fastener to be used.) A location
must be selected that allows the
thermocouple tip to reach at least 130° C
(400° F). However, the tip temperature
must not exceed 350° C (660° F). If a
pilot light is present, keep the
thermocouple at least 6" away from the
pilot flame.
Step 3 - Route thermocouple wire away
from the appliance.
Page 46