Bryant EVOLUTION 577DNW042090 Installation Instructions Manual page 20

OPERATION
Standby – no call for unit opera-
tion
Emergency Mode
Low Stage Cool/Heat Operation
High Stage Cool/Heat Opera-
tion
S Five minute compressor recycle delay on return from a
brown- -out condition.
S Two minute time delay to return to standby operation
from last valid communication (with Evolution only).
S One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100_F.
S There is no time delay between air conditioner staging
from low to high and from high to low capacity; the
compressor will change from low to high and from high
to low capacity as demand dictates.
EVOLUTION CONTROLLED LOW AMBIENT COOLING
Table 5—HEAT PUMP/AIR CONDITIONER BOARD STATUS CODES
AMBER
LED
FAULT
FLASH
CODE
On solid,
None
no flash
Rapid, con-
Standard Ther-
tinuous
mostat Control
flashing
None 1, pause
None 2, pause
System Commu- 16
nications Failure
Invalid Model
25
Plug
High--- Pressure
31
Switch Open
Low--- Pressure
32
Switch Open
Control Fault 45
Brown Out
46
(230 v)
No 230v at Unit 47
Outdoor Air
Temp Sensor 53
Fault
Outdoor Coil
55
Sensor Fault
Thermistors Out
56
of Range
Low Stage Ther-
71
mal Cutout
High Stage Ther-
72
mal Cutout
Contactor
73
Shorted
No 230V at
74
Compressor
Low Stage Ther-
81
mal Lockout
High Stage Ther-
82
mal Lockout
Low--- Pressure
83
Lockout
High--- Pressure
84
Lockout
POSSIBLE CAUSE AND ACTION
Normal operation.
Unit being controlled by standard thermostat inputs instead of
Evolution Control. Only high stage operation is available. This
operating mode should be used in emergency situations only.
Normal operation.
Normal operation.
Communication with UI lost. Check wiring to UI, indoor and outdoor
units.
Control does not detect a model plug or detects an invalid model
plug. Unit will not operate without correct model plug.
High--- pressure switch trip. Check refrigerant charge, outdoor fan
operation and coils for airflow restrictions.
Low--- pressure switch trip. Check refrigerant charge and indoor air
flow.
Outdoor unit control board has failed. Control board needs to be
replaced.
Line voltage < 187v for at least 4 seconds. Compressor and fan
operation not allowed until voltage>190v. Verify line voltage.
There is no 230v at the contactor when indoor unit is powered and
cooling/heating demand exists. Verify the disconnect is closed and
230v wiring is connected to the unit.
Outdoor air sensor not reading or out of range. Ohm out sensor
and check wiring.
Coil sensor not reading or out of range. Ohm out sensor and check
wiring.
Improper relationship between coil sensor and outdoor air sensor.
Ohm out sensors and check wiring.
Compressor voltage sensed, then disappears while cooling or heat-
ing demand exists. Possible causes are internal compressor over-
load trip or start relay not releasing (if installed).
Compressor voltage sensed, then disappears while cooling or heat-
ing demand exists. Possible causes are internal compressor over-
load trip or start relay not releasing (if installed).
Compressor voltage sensed when no demand for compressor op-
eration exists. Contactor may be stuck closed or there is a wiring
error.
Compressor voltage not sensed when compressor should be start-
ing. Contactor may be stuck open or there is a wiring error.
Thermal cutout occurs in three consecutive low/ high stage cycles.
Low stage locked out for 4 hours or until 24v power recycled.
Thermal cutout occurs in three consecutive high/low stage cycles.
High stage locked out for 4 hours or until 24v power recycled.
Low--- pressure switch trip has occurred during 3 consecutive
cycles. Unit operation locked out for 4 hours or until 24v power
recycled.
High--- pressure switch trip has occurred during 3 consecutive
cycles. Unit operation locked out for 4 hours or until 24v power
recycled.
NOTE:When this unit is operating below 55_F outdoor
temperature, provisions must be made for low ambient operation.
This unit is capable of low ambient cooling down to 0_F ONLY
when using the Evolution control. A low ambient kit is not required,
and the outdoor fan motor does not need to be replaced for
Evolution controlled low ambient operation. Low ambient cooling
must be enabled in the UI set- -up. Fan may not begin to cycle until
about 40_F OAT. Fan will cycle based on coil and outdoor air
temperature. Evolution controlled low ambient mode operates as
follows:
In high stage, fan is off when outdoor coil temp is <outdoor
S
air temperature +3_F or outdoor fan has been ON for 30
20