Hussmann Proto-Aire, Installation Manual

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Protocol™ Installation and
Service Manual
Under split suction configuration, this input provides the electronic controller pressure
signal used to cycle compressors on and off. The split suction configuration may contain
multiple compressors (2 or more) or a single compressor (low or high end satellite). When
tow or more compressors are attached to the second suction header, you will need to
program the following: Split Suction Operation (Enabled/Disabled), Number of
Compressors, Split Suction Setpoint, High Alarm, Low Alarm, Range.
If only a single compressor is used (Satellite configuration), you will need to program the
following: Satellite Operation (Enabled/Disabled), Satellite Setpoint, Satellite Differential,
High Alarm, Low Alarm, Range.
Temperature Input
This temperature input has a dual function operation: 1) temperature input for Suction
Pressure Reset feature or 2) alarming and monitoring of temperature for a display case.
The Suction Pressure Reset function allows the suction pressure setpoint to float upward to
reduce compressor energy consumption. The temperature sensor used with the Suction
Pressure Reset function alls a setpoint to be entered for a specific display case, normally
the case containing the evaporator with the lowest suction temperature. When the
temperature in this case is satisfied, the suction pressure setpoint will increase by 1 psi.
The following information should be programmed into the control: Suction Pressure Reset
(Enable/Disable), Suction Pressure Reset Setpoint, High Alarm, Low Alarm.
When this temperature input is used to monitor and alarm on temperature of a given display
case, the following information should be used: High Alarm, Low Alarm, Alarm
Activation (Enabled/Disabled), Alarm Delay, Circuit Attachment.
All Additional Pressure/Temperature Inputs
This temperature input has a dual function operation: 1) pressure input for monitoring
discharge pressure or 2) alarming and monitoring of temperature for a display case. Since
this input can operate as a temperature or pressure, you will need to configure both the
hardware (input circuitry) and software (memory settings) for proper operation. When
operating as a pressure input, the following should be programmed: Input mode (Set to
pressure), High Alarm, Low Alarm, Alarm Activation (Enable/Disabled).
When operating as a temperature input, the following should be programmed: Input mode
(Set to temperature), High Alarm, Low Alarm, Alarm Activation (Enable/Disabled),
Circuit Attachment.
Programming the Optional In-store Alarm and Auto Dialer
All alarm wiring (refer to Electronic section) must be complete before beginning the
programming of the alarm dialer. The Protocol™ units and any other equipment connected
on the alarm connection must not be in alarm. This normal operation state is used to allow
the auto dialer to preset the non-alarm condition present on the alert inputs.
IMPORTANT: Make sure that the auxiliary batteries if required for the auto dialer
are inserted before beginning programming information within the auto dialer’s
memory.
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