CA - A 2
Charge Assist™
Note:
The Charge Assist™ Procedure Details are for educational
purposes only. Please refer to the most recent documents
for updated material before engaging in any of these tests
and procedures
Sequence of Operation
The OUTDOOR UNIT’S Charge Assist ™(CA) Control
Board, is a microprocessor based control which can
communicate digitally with a communicating system’s
thermostat or can be connected to a standard 24VAC
thermostat. The CA control has two modes of operation.
In the normal operating mode, the CA control will
respond to the indoor thermostat call for operation.
The other mode of operation is the Charge Assist™
mode.
To put the outdoor unit into the Charge Assist™ mode,
press the MODE button for 1 second. The control exits
the normal operating mode and enters the Charge
Assist™ mode.
The CA control completes the following operations:
• Turns on the first or second stage compressor
• Controls the two compressors’ minimum on and off
time and the one minute time delay between stages
• Sends speed signals to the outdoor fan
• Reads the outdoor temperature and sends a digital
outdoor temperature message to the communicating
system thermostat
• Reads the Liquid Line Pressure and temperature
• Is also the Demand Defrost Control when applied to
a Heat Pump
• Can diagnose System Operating Faults.
Control LED Indications
Charge Assist™ Control LED Indications
(Figure 1)
• Y-1 LED ON = First Stage Compressor operation
• Y-1 and Y-2 LEDs Flashing = CA™ control system
is in the one minute compressor off time delay period
before going to Second Stage compressor operation
• Y-1 LED and Y-2 LED ON = Second Stage
Compressor operation
• Y-1 LED Flashing = CA™ control system is in the
one minute compressor off time delay period before
going back to FIRST stage compressor operation
• Status LED Slow Flash = CA™ control in the
normal operating mode
• Status LED Fast Flash = At power up, this LED will
flash fast for 20 seconds.
• Status LED OFF = CA™ control is in the Charge
Assist™ Mode.
• Com LED ON = At power up, this LED will be on for
20 seconds.
Figure 1
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