Install Instructions
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108978-01 - 7/18
G. BOILER SUPPLY CONNECTIONS
q WARNING: Boiler temperature must be controlled by the boiler high limit not to exceed 200°.
Failure to do so will create a hazardous installation and void the applicable limited warranties.
q All water supply fittings on this heater are brass – do not over tighten or strip threads.
q It is recommended to use a union as per Figures 1 and 2.
q Connect the supply line (from the boiler) to the “Hx In” fittings of the heat exchanger. Connect the
return line (back to the boiler) to the “Hx Out” fittings.
q For closed-loop systems that do not use water as the heat-transfer fluid, the total volume of the
heat-transfer fluid in the closed loop shall be less than 10% of storage tank volume.
Max Loop length = (tank capacity/100 / (PI * pipe radius * pipe radius)
NOTE: Be sure to connect Boiler Supply Line (from the boiler) to the “HX in” fitting and Boiler
Return Line (to the boiler) to the “HX Out” fitting.
H. FILLING THE HEATER
q Check that the temperature-and-pressure relief valve has been properly installed (mandatory
requirement).
q Completely close the drain valve.
q Open the highest hot water faucet to allow air to escape from piping.
q Open the valve to the cold-water inlet and allow the heater and piping system to completely fill, as
indicated by a steady flow of water from the open faucet.
I. THERMOSTAT INSTALLATION
q Attaching Thermostat to tank:
Place hole in back of Thermostat over the temperature sensor leads. It should fit flush against the
tank. Use the provided self-tapping screw (Screw A) to attach case back directly to the Alliance LT
(see Thermostat Diagram 1).
q Connect temperature sensor wires to press release connector (if equipped). (See Thermostat
Diagram 4).
q Run all 24Vac wiring thru the square notch on bottom of thermostat case. (See Thermostat
Diagram 3). (Note: Sensor does NOT need to make intimate contact with entire well surface to
work properly).
q The Alliance LT may operate as a separate heating zone using either the heating system
circulator and an appropriate zone valve, or a separate circular dedicated for water heating. (See
Figure 1 & 2).
q In both systems, the Alliance LT is controlled through the thermostat on the heater. (See
Figures 1 & 2).
q Be certain to replace thermostat cover using Black Screw provided.
J. TPI WIRING CONTROLS
NOTE: THE TPI THERMOSTAT MUST BE POWERED WITH 24VAC.
q 24VAC power must be connected to 24VAC connectors on the bottom right corner of TPI
(See TPI Diagram 3)
q The TPI 24VAC only requires 20mA, or about 0.5 Watts.
q Connect control wiring to PUMP/TT normally open relay connections (rated for both 24V and 110V
wiring) on the bottom left corner of TPI. (See Thermostat Diagram 2).
q All and only 110VAC wiring must go through an appropriate chase nipple installed in the knockout
at bottom of TPI case.