American Standard 4A6V0024A1000B Service Facts page 22

V V a a r r i i a a b b l l e e S S p p e e e e d d A A l l e e r r t t C C o o d d e e s s
Display
Alert
Alert
Assembly
Group
Code
Text
High
Pressure
80 HP SHORT LO
Monitor
Fault
HP HARD LO
High
Pressure
80
Monitor
Fault
HP RED RPS
Ground
88 GND FAULT LO
fault
Communi-
cation
90 SYS COM BUSY
Busy Fault
SYS COM ERR
Communi-
91 cation
Fault
NO SYS CLK
External
106 Shutdown EXT SW OPEN
Fault
22
Sub-
A/TZONE
State action on
alar-
850/950
occurrence
m
5 min of compressor
0 "Wait"
lockout and send
"WAIT "to thermostat
Lockout compressor
operation until power
1 Err 80.01
cycle, No system
operation
On restart, after short
lockout, compressor
will operate at reduced
capacity and this alert
is declared. (Message
on Tstat informing of
2 "Wait"
reduced capacity)
Note: Recover reduced
capacity with each 2 hr
run time window
without an HPCO trip.
Emergency shutdown.
1 Err 88.01
Drive will protect itself.
CLII bus must go idle.
Continue to operate
2 Err 90.02
normally
Shutdown if Heat/Cool
demand message not
2 Err 91.02
received for 3
reporting intervals.
3 Err 91.03 Shutdown
Compressor cooling
1 "Load Shed" operation shall not be
allowed.
Alert
State action on
Description
clearance
High pressure
Restart with switch has
reduced capacity. tripped resulting
(Capacity reduced in a High Pressure
by 1/5 with each Short Lock Out.
occurrence) (HPCO limit =
650psig)
6 High Pressure
Short Lock Out
Can be cleared only
events have
on power cycle.
occurred
After power cycle,
resulting in a High
the compressor
Pressure Hard
shall resume
Lock Out. (High
normal operation.
Pressure Limit =
650psig)
High Pressure trip
point has been
exceeded and a 5
minute time out
Normal operation
has been
resumes.
enforced. Restart
is allowed but
with reduced
capacity.
Grounding issue
Can be cleared only
from output of
on power cycle.
the drive. If the
After power cycle,
sum of all three
the compressor
currents exceeds
shall resume
10 amp to
normal operation.
ground
Resume normal Communication
operation busy
Resume normal Loss of Heat/Cool
operation demand message
Resume normal
Loss of Bit Master
operation
External
Resume normal shutdown switch
operation. Cooling is Active and
operation allowed. input at T3 to T4
is open
Possible Cause
Overcharged.
Cooling Mode:
Outdoor Fan Failure,
clogged coil,
recirculation,
excessive high
ambient, non
condensable.
Heating Mode:
Indoor Fan Failure,
clogged coil, non
condensable.
Overcharged.
Cooling Mode:
Outdoor Fan Failure,
clogged coil,
recirculation,
excessive high
ambient, non
condensable. Heating
Mode: Indoor Fan
Failure, clogged coil,
non condensable.
Overcharged.
Cooling Mode:
Outdoor Fan Failure,
clogged coil,
recirculation,
excessive high
ambient, non
condensable.
Heating Mode:
Indoor Fan Failure,
clogged coil, non
condensable.
Burnt winding, faulty
current sensor,
internal board short,
pinched compressor
lead (shorted). Run
Drive Test.
(GoTo "Compressor
Verification"
troubleshooting flow
chart)
R & B to thermostat
reversed polarity
Open/Shorted Data
line Check for
reversed polarity
Bit Master Control
Fault
External Load Shed
device is active with
external switch
configured to Active
and input at T3 to T4
is open
4A-V0-SF-1G-EN