Enertech Global
EAV - EME/EMD Rev. A Models
Installaon and Operaons Manual
Human Machine Interface (HMI). Touch screen user interface
where current status can be observed and sengs of the system
can be changed, described in addional detail in this secon.
This is the master controller which communicates via RS-485
with the ASB and outdoor unit.
The eld wiring blocks provide dry contact inputs for connecon
to zone controllers (see Secon 8). These inputs provide calls for
Heang, Cooling, High Heang, and Hot Water.
The ASB is a secondary controller to the HMI (primary controller)
and provides inputs for sensors and outputs to actuators for
the Indoor Module. The inputs include thermistors, ow meter,
and pump feedback. It controls actuators, including pump speed
(via PWM), electric heater stages, and the three way valve.
24VAC from the transformer is fed into the ASB for use on these
outputs.
The Companion Board is an IO expander for the ASB. The
dry contact inputs on the eld wiring in input into this board.
Addionally, it provides stable 12VDC supply for the ASB and
HMI from input line voltage.
Two thermistors are ulized on the Indoor Module to measure
entering and leaving load temperatures. Through these
measurements the temperature dierence (Delta-T) is calculated
and provides the ideal pump speed. Reference Secon 12 for
resistance values.
The ow meter provides an accurate measurement of GPM
through the load circuit. It is used for modulaon of pump,
ensuring minimum ow in all condions. They are also used for
simple readouts on the HMI as well as ow faults and alarms.
Touch screen user interface where current status can be
observed and sengs of the system can be changed. This is the
master controller which communicates via RS-485 with the ASB
and outdoor unit.
The Startup Wizard is part of the First Run Setup. This Wizard
is designed to ensure that the system has the proper ow rates
and that air is purged from this system. Screens from the Startup
Wizard are shown on the next page.
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