25
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 Trouble 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.
Controller’s Power LED is Off
1. Make sure the circuit supplying power to the controller 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 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. 31. Repair or replace loose or missing wiring.
2. Configure the sensor dirty test to activate the controller’s
supervision relay. See “Changing dirty sensor test” opera-
tion on page 23.
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.
OVERTEMPERATURE
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 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
The system is protected against a loss of charge and low evapo-
rator 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).
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 auto-
matically.
The High Static option supply fan motor is equipped with a pi-
lot-circuit Thermix combination overtemperature/overcurrent
protection device. This device resets automatically. Do not by-
pass this switch to correct trouble. Determine the cause and
correct it.
CONDENSER FAN MOTOR PROTECTION
The condenser fan motor is internally protected against over-
temperature.
Relief Device
A soft solder joint at the suction service access port provides
pressure relief under abnormal temperature and pressure condi-
tions (i.e., fire in building). Protect this joint during brazing op-
erations near this joint.
Control Circuit, 24-v
The control circuit is protected against overcurrent conditions
by a circuit breaker mounted on control transformer TRAN.
Reset is manual.
ELECTRIC HEATERS
The 50KC units may be equipped with field-installed accesso-
ry electric heaters. The heaters are modular in design, with
heater frames holding open coil resistance wires strung through
ceramic insulators, line-break limit switches and a control con-
tactor. One or two heater modules may be used in a unit.
Heater modules are installed in the compartment below the in-
door (supply) fan outlet. Access is through the indoor access
panel. Heater modules slide into the compartment on tracks
along the bottom of the heater opening. See Fig. 34-36.
Fig. 34 — Typical Access Panel Location
DI
S
CONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
OUTDOOR
ACCE
SS
PANEL
INDOOR
ACCE
SS
PANEL
Summary of Contents for Puron R-410A
Page 29: ...29 Fig 44 RTU Open Overlay for Economizer Wiring ...
Page 30: ...30 Fig 45 VFD Overlay for W2770 Controller Wiring ...
Page 50: ...50 Fig 63 50KC Typical Unit Wiring Diagram Power 06A 208 230 3 60 ...
Page 51: ...51 Fig 64 50KC Unit Wiring Diagram Control A06 ...
Page 77: ...77 Fig C Unit Wiring Diagram Power for Sizes A04 and A06 208 230 1 60 ...
Page 78: ...78 Fig D Unit Wiring Diagram Power for Size A05 208 230 1 60 ...
Page 79: ...79 Fig E Unit Wiring Diagram Power for Sizes A04 A06 208 230 3 60 460 3 60 575 3 60 ...