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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 sensor 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, de-
termine why the controller does not have power and
make the necessary repairs.
2. Check the wiring between the sensor and the con-
troller. If wiring is loose or missing, repair or replace
as required.
Controller's Power LED is Off
1. Make sure the circuit supplying power to the con-
troller is operational. If not, make sure JP2 and JP3
are set correctly on the controller before applying
power.
2. Verify that power is applied to the controller's sup-
ply 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. 52. Repair or replace loose or missing wiring.
2. Configure the sensor dirty test to activate the con-
troller's supervision relay. See "Changing sensor
dirty test operation."
Sensor's Trouble LED is On, But the Controller's
Trouble LED is OFF
Remove JP1 on the controller.
PROTECTIVE DEVICES
Compressor Protection
Overcurrent
The compressor has internal linebreak motor protection.
Over Temperature
The compressor has an internal protector to protect it
against excessively high discharge gas temperatures.
High Pressure Switch
The system is provided with a high pressure switch
mounted
on
the
discharge
stem- - mounted and brazed into the discharge tube. Trip
setting is 630 psig
10 psig (4344
Reset is automatic at 505 psig (3482 kPa).
Low Pressure Switch
The system is protected against a loss of charge and low
evaporator 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
(372
34 kPa). Reset is automatic at 117
34 kPa).
Evaporator Freeze Protection
The system is protected against evaporator coil frosting
and low temperature conditions by a temperature switch
mounted on the evaporator coil hairpin. Trip setting is
30_F
5_F (- - 1_C
3_C). Reset is automatic at 45_F
(7_C).
Supply (Indoor) Fan Motor Protection
Disconnect and lockout power when servicing fan motor.
The standard supply fan motor is equipped with internal
overcurrent and overtemperature protection. Protection
devices reset automatically.
The High Static option supply fan motor is equipped with
a pilot- - circuit Thermix combination overtemperature/
overcurrent
protection
device.
automatically. Do not bypass this switch to correct
trouble. Determine the cause and correct it.
Condenser Fan Motor Protection
The condenser fan motor is internally protected against
overtemperature.
Relief Device
A soft solder joint at the suction service access port
provides pressure relief under abnormal temperature and
pressure conditions (i.e., fire in building). Protect this
joint during brazing operations near this joint.
44
line.
The
switch
is
69 kPa) when hot.
5 psig
5 psig (807
This
device
resets
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