Installation manual

30
PREMIER INSTALLATION MANUAL
The Premier control system is a microprocessor-based printed circuit board conveniently located in the unit control box
for easy accessibility. The microprocessor provides control of the entire unit as well as outputs for status modes, faults, and
diagnostics. Low voltage terminal strips provide all necessary terminals for fi eld connections. LEDs are located on the front
of the unit for quick inspection without removing any access panels. The control offers optimal space conditioning. The
board accepts traditional 24VAC thermostat inputs.
Startup
The unit will not operate until all the inputs and safety controls are checked for normal conditions. At fi rst power-up, a
four-minute delay is employed before the compressor is energized.
Component Sequencing Delays
Components are sequenced and delayed for optimum space conditioning performance.
Accessory Relay
An accessory relay on the control board allows for fi eld connection of solenoid valves, electronic air cleaners, etc. The
accessory relay has a normally open output and a normally closed output. The accessory relay is factory set to control the
optional electronic air-cleaner.
Short Cycle Protection
The control employs a minimum “off” time of four minutes and a minimum “on” time of two minutes to provide for short
cycle protection of the compressor.
Loop Pump SL Signals
A signal between multiple Premier control boards at the SL inputs and outputs (SL1-In and Out) will provide for remote
control of the loop pump on any unit.
Condensate Overfl ow Protection
The Premier control board incorporates an impedance sensing liquid sensor at the top of the drain pan. Upon a continu-
ous 30-second sensing of the condensate, compressor operation is suspended (see fault retry), the condensate overfl ow
lockout LED begins fl ashing, and an output signal (LO) is made available for conneciton to a “fault” LED at the thermostat.
Shutdown Input
A simple grounded signal to the “shutdown” input on the control board puts the unit into shutdown mode. Compressor,
hot water pump and fan operaiotn are suspended
Safety Controls
The Premier control receives separate signals for a high pressure switch for safety, a low pressure switch to prevent loss
of charge damage, and a low suction temperature thermistor for freeze protection. Upon a continuous 30-second measure-
ment of the fault (immediate for high pressure), compressor operation is suspended (see fault retry), the appropriate lockout
LED begins fl ashing, and an output signal (LO) is made available for connection to a “fault” LED at the thermostat.
Testing
The Premier control allows service personnel to shorten most timing delays for faster diagnostics (see fi eld selection DIP
switch #1).
Standard Microprocessor Control Operation