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Charge Assist™ (CA) Procedure for a NON-Communicating
24VAC Control System
STeP 1:
Outdoor units coupled with 24 volt indoor units (outdoor
units require BAYACHP024* for 24V operation) require the
technician to set up the Variable Speed (VS) Air Handler
or VS Furnace with the DIP switches for the size of the
equipment installed. (Unit tonnage, CFM per ton 350,
400, 450 required, the blower delays and Heating airflow)
CA cycle is compatible with ENHANCED Mode.
STeP 2:
A technician must set the indoor system control to call for
the SeCONd STAGe of COOLING. The indoor CON-
TROL must be set low enough to ensure the system
continues to run in SeCONd STAGe of COOLING
throughout the CA mode cycle. The CA control will exit
the CA mode CyCLe if the system control does not stay
in the SECOND STAGE cooling cycle. (The CA Control
must see 24 Volts AC call on both Y1 and Y2.)
SuMMARy OF ALeRT COde & CHARGe ASSIST
LED
Alert
Fault LED
Color
Code
90
Excessive Communication Errors
Loss of Heat/Cool Demand Message
1 Flash
91
(COMM)
Loss of Bit Master
2 Flash
Defrost Fault A
3 Flash
68
Defrost Fault B and/or C
4 Flash
Defrost Fault A and [B and/or C]
Ambient Temperature Sensor Fault
5 Flash
(Out of Range - Open or Shorted)
67
Coil Temperature Sensor Fault
6 Flash
(Out of Range - Open or Shorted)
Low Pressure Cut Out Fault
outside of defrost Cycle-Hard lock out, cycle
power to reset)
Low Pressure Cut Out Fault
Heat/Cool Lock out
7 Flash
79
Low Pressure Cut Out Fault
outside of defrost Cycle-Short lock out)
Y2 without Y1 - Miswire
10 Flash
102
(24 volt mode only)
Liquid Temperature Sensor Fault
11 Flash
67
(Out of Range - Open or Shorted)
Liquid Pressure Sensor Fault
12 Flash
113
Red
(Out of Range - Open or Shorted)
External Outdoor Temperature
13 Flash
67
Sensor Fault
(Out of Range - Shorted)
PM Missing with local copy
(Operational)
Bad Data in PM with local copy
(Operational)
14 Flash
114
Bad Data in PM no local copy
(Not Operational)
PM Missing with no local copy
(Not Operational)
15 Flash *
50
Duplicate OD Temperature Sensor *
16 Flash *
123
Demand Configuration Fault *
High Presure Monitor Fault
(Hard lock out, cycle power to reset)
17 Flash
80
High Presure Monitor Fault
(Short lock out)
18 Flash
18
24V Sensing Error
4 highest priority Faults display flash codes sequentially. 2 second pause between faults and 4 second pause between sequences. Cycle power to ODU to clear Faults.
Notes:
*
Alert flash code will not be implemented for initial release
¤ Wait icon will appear on the Comfort Control during: Equipment minimum off time, Charge Assist
6
Control
Description
Display
N/A
ERR 91
(Clock Signal)
N/A
ERR 67
(Open
ERR 79
(Open
Wait ¤
N/A
N/A
ERR 113
N/A
ERR 114
N/A
ERR 114
N/A
N/A
ERR 80
Wait ¤
ERR 18
(24V Missing at Y1)
STeP 3:
Press the mode button on the CA board and follow the CA
procedures starting with STeP 1 in the Communicating
Comfort Control Section above.
STeP 4:
After the CA control exits the CA mode CYCLE, the tech-
nician must then return the
NON-COMMUNICATING 24 volt indoor CONTROL to the
desired customer setting.
LED
Charge Assist™ (CA) LEDs
Color
Flashing
CHARGED
Off
On
Y1
On
Y2
On
Fast Flash
Green
Med Flash
STATUS
Slow Flash
Off
LitePort
Occasional Flash For transmitting LitePort
Flashing
COM
Off
On
Amber
Flashing
CHARGING
Off
ADD
On
ODT
Flashing
Red
RECOVER
On
LOW
On
Notes: ** Used with 20 SEER Models
TM
, Short lock out (see Alert Codes "7 Flash" & "17 Flash")
Printed from D802247P01 Rev08
LedS
TM
Description
See Charging Flash Rate
Charged or not in CA Mode
Charge is Correct
1st stage compressor requests
2nd stage compressor request
Initialization at Power Up ~ 60 seconds
Oil Return Mode **
(Forced Defrost)
Standard operation
Charge Assist™ mode or no power to control
data
TM
Flash device count when in communication
(number of COMM products connected in system);
Rapid flashes followed by a pause indicates
disrupted communications
No power
Solid at power-up
See Stabilization Flash Rate
Not in CA Mode
System requires refrigerant charge
(Control has 24 volt AC output to Charge Solenoid)
Ambient Temperature is out of range -
Ambient Temperature must be above 55°F
and below 120°F to enter CA Mode
Note: ODT LED will flash 1 sec ON/OFF for 30
seconds and the CHARGING LED will flash 5 times per
second for 2 seconds, then exit CA.
Need to recover refrigerant - Unit locked out
for 1 hour or press mode button to exit
Charge Assist™
Liquid pressure below 90 psig - Liquid
pressure must be above 90 psig to enter CA
Mode
Note: LOW pressure LED will be on for 30 seconds
and the CHARGING LED will flash 5 times per second
for 2 seconds, then exit CA.
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