Troubleshooting; Protective Devices; Compressor Protection; Supply (Indoor) Fan Motor Protection - Bryant Preferred Series Service And Maintenance Instructions

CONTROL OR INDICATOR
Magnetic test/reset switch
Alarm LED
Trouble LED
Dirty LED
Power LED
ALARM
Fig. 37 — Controller Assembly
NOTE: All troubles are latched by the duct smoke detector. The
trouble condition must be cleared and then the duct smoke detec-
tor must be reset in order to restore it to the normal state.
RESETTING ALARM AND TROUBLE
TRIPS:
Manual reset is required to restore smoke detector systems to Nor-
mal operation. For installations using two sensors, the duct smoke
detector does not differentiate which sensor signals an alarm or
trouble condition. Check each sensor's LED for Alarm or Trouble
status. Clear the condition that has generated the trip at this sensor.
Then reset the sensor by pressing and holding the reset button (on
the side) for 2 seconds. Verify that the sensor's Alarm and Trouble
LEDs are now off. At the controller, clear its Alarm or Trouble
state by pressing and holding the manual reset button (on the front
cover) for 2 seconds. Verify that the controller's Alarm and Trou-
ble LEDs are now off. Replace all panels.

Troubleshooting

CONTROLLER'S TROUBLE LED IS ON
1. Check the Trouble LED on each sensor connected to the
controller. If a sensor's Trouble LED is on, determine the
cause and make the necessary repairs.
2. Check the wiring between the sensor and the controller. If
wiring is loose or missing, repair or replace as required.
CONTROLLER'S TROUBLE LED IS FLASHING
1. One or both of the sensors is 100% dirty.
2. Determine which Dirty LED is flashing, then clean that sen-
sor assembly as described in the detector cleaning section.
SENSOR'S TROUBLE LED IS ON
1. Check the sensor's Dirty LED. If it is flashing, the sensor
is dirty and must be cleaned.
2. Check the sensor's cover. If it is loose or missing, secure
the cover to the sensor housing.
3. Replace sensor assembly.
SENSOR'S POWER LED IS OFF
1. Check the controller's Power LED. If it is off, determine
why the controller does not have power and make the nec-
essary repairs.
2. Check the wiring between the sensor and the controller. If
wiring is loose or missing, repair or replace as required.
Table 7 — Detector Indicators
Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in the
normal state.
Indicates the sensor is in the alarm state.
Indicates the sensor is in the trouble state.
Indicates the amount of environmental compensation used by the sensor (flashing continuously = 100%)
Indicates the sensor is energized.
TROUBLE
POWER
POWER
TROUBLE
ALARM
RESET
TEST/RESET
SWITCH
CONDITION
DESCRIPTION
CONTROLLER'S POWER LED IS OFF
1. Make sure the circuit supplying power to the controller is
operational. If not, ensure JP2 and JP3 are set correctly on
the controller before applying power.
2. Verify that power is applied to the controller's supply
input terminals. If power is not present, replace or repair
wiring as required.
REMOTE TEST/RESET STATION'S TROUBLE LED DOES
NOT FLASH WHEN PERFORMING A DIRTY TEST, BUT
THE CONTROLLER'S TROUBLE LED DOES
1. Verify that the remote test/station is wired as shown in
Fig. 35. Repair or replace loose or missing wiring.
2. Configure the sensor dirty test to activate the controller's
supervision relay. See "Changing sensor dirty test operation."
SENSOR'S TROUBLE LED IS ON, BUT THE CONTROL-
LER'S TROUBLE LED IS OFF
Remove JP1 on the controller.

PROTECTIVE DEVICES

Compressor Protection

OVERCURRENT
Each compressor has internal linebreak motor protection. Reset is
automatic after compressor motor has cooled.
OVERTEMPERATURE
Each compressor has an internal protector to protect it against ex-
cessively high discharge gas temperatures. Reset is automatic.
HIGH PRESSURE SWITCH
Each system is provided with a high pressure switch mounted on
the discharge line. The switch is stem-mounted and brazed into the
discharge tube. Trip setting is 630 psig ± 10 psig (4344 ± 69 kPa)
when hot. Reset is automatic at 505 psig (3482 kPa).
LOW PRESSURE SWITCH
Each system is protected against a loss of charge and low evapora-
tor coil loading condition by a low pressure switch located on the
suction line near the compressor. The switch is stem-mounted.
Trip setting is 54 psig ± 5 psig (372 ± 34 kPa). Reset is automatic
at 117 ± 5 psig (807 ± 34 kPa).

Supply (Indoor) Fan Motor Protection

PERSONAL INJURY HAZARD
Failure to follow this caution can result in personal injury.
Disconnect all electrical power when servicing the fan motor.
Apply appropriate lockout/tag-out procedures.
Motors with 2.9 and 3.7 bhp are equipped with an overtempera-
ture or protection device. The type of device depends on the motor
size. See Table 8.
31
CAUTION