York
The light emitting diode (LED) installed on the Unit Controller is used to indicate the functionality of the Unit Controller and the unit.
YPAL 050
YPAL 051
YPAL 060
YPAL 061
035-21979-002
New Release
DESIGN LEVEL F
SIMPLICITY ELITE CONTROL
FAULTS AND LOCKOUTS
ALARM CODES
An active alarm is represented by a fl ashing alarm code numeral. There are 43 alarms in all. Not all the alarms are critical enough to shut down the system. Some alarms fl ag the problem to bring it to the attention of the operator or technician while allowing the system to continue to operate.
TABLE 8-9 – ALARM CODE DESCRIPTIONS
ALARM CODE DESCRIPTION
01
COMPRESSOR SYSTEM 1 (COMPRESSORS 1A, 1B) LOCKED OUT ON HIGH PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 2-HOUR WINDOW.
02
COMPRESSOR SYSTEM 1 (COMPRESSORS 1A, 1B) LOCKED OUT ON HIGH PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 2-HOUR WINDOW.
03
COMPRESSOR SYSTEM 2 (COMPRESSORS 2A, 2B) LOCKED OUT ON HIGH PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 2-HOUR WINDOW.
04
COMPRESSOR SYSTEM 2 (COMPRESSORS 2A, 2B) LOCKED OUT ON HIGH PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 2-HOUR WINDOW.
05
COMPRESSOR SYSTEM 1 (COMPRESSORS 1A, 1B) LOCKED OUT ON LOW PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
06
COMPRESSOR SYSTEM 1 (COMPRESSORS 1A, 1B) LOCKED OUT ON LOW PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
07
COMPRESSOR SYSTEM 2 (COMPRESSORS 2A, 2B) LOCKED OUT ON LOW PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
08
COMPRESSOR SYSTEM 2 (COMPRESSORS 2A, 2B) LOCKED OUT ON LOW PRESSURE CONTROL. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
09
COMPRESSOR SYSTEM 1A LOCKED OUT ON COMPRESSOR MOTOR PROTECTION MODULE. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
10
COMPRESSOR SYSTEM 1B LOCKED OUT ON COMPRESSOR MOTOR PROTECTION MODULE. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
11
COMPRESSOR SYSTEM 2A LOCKED OUT ON COMPRESSOR MOTOR PROTECTION MODULE. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
12
COMPRESSOR SYSTEM 2B LOCKED OUT ON COMPRESSOR MOTOR PROTECTION MODULE. THE CIRCUIT
OPENED THREE TIMES WITHIN A 1-HOUR WINDOW.
13
FIRST STAGE HEATING IS LOCKED OUT ON LIMIT SWITCH TRIPS. THE CIRCUIT OPENED THREE TIMES WITHIN
A 1-HOUR WINDOW.
14
SECOND STAGE HEATING IS LOCKED OUT ON LIMIT SWITCH TRIPS. THE CIRCUIT OPENED THREE TIMES
WITHIN A 1-HOUR WINDOW.
15
THIRD STAGE HEATING IS LOCKED OUT ON LIMIT SWITCH TRIPS. THE CIRCUIT OPENED THREE TIMES WITHIN
A 1-HOUR WINDOW
16
FIRST STAGE OF HEATING IS LOCKED OUT BECAUSE THE IGNITION CONTROL BOARD FAILED TO TURN
ON THE GAS VALVE AFTER 5 MINUTES OF OPERATION OR THE GAS VALVE HAS VOLTAGE ON IT AND THE
CONTROL IS NOT CALLING FOR THE STAGE OF HEATING.
17
SECOND STAGE OF HEATING IS LOCKED OUT BECAUSE THE IGNITION CONTROL BOARD FAILED TO TURN
ON THE GAS VALVE AFTER 5 MINUTES OF OPERATION OR THE GAS VALVE HAS VOLTAGE ON IT AND THE
CONTROL IS NOT CALLING FOR THE STAGE OF HEATING.
18
THIRD STAGE OF HEATING IS LOCKED OUT BECAUSE THE IGNITION CONTROL BOARD FAILED TO TURN
ON THE GAS VALVE AFTER 5 MINUTES OF OPERATION OR THE GAS VALVE HAS VOLTAGE ON IT AND THE
CONTROL IS NOT CALLING FOR THE STAGE OF HEATING.
19
SPACE TEMPERATURE SENSOR HAS FAILED OPEN OR SHORTED. THE DISPLAY WILL INDICATE –40.0.
20
SUPPLY AIR TEMPERATURE SENSOR HAS FAILED OPEN OR SHORTED. THE DISPLAY WILL INDICATE –40.0.
21
RETURN AIR TEMPERATURE SENSOR HAS FAILED OPEN OR SHORTED. THE DISPLAY WILL INDICATE –40.0.
22
OUTDOOR AIR TEMPERATURE SENSOR HAS FAILED OPEN OR SHORTED. THE DISPLAY WILL INDICATE –40.0.
23
DIRTY FILTER SWITCH HAS CLOSED INDICATING THE FILTERS NEED REPLACED. THIS HAS NO EFFECT ON
THE OPERATION OF THE UNIT.
24
THE SUPPLY FAN BINARY OUTPUT HAS BEEN TURNED ON FOR 90 SECONDS AND THE AIR PROVING SWITCH
CIRCUIT HAS NOT CLOSED.
25
THE SUPPLY FAN BINARY OUTPUT HAS BEEN TURNED OFF FOR 90 SECONDS AND THE AIR PROVING SWITCH
CIRCUIT HAS NOT OPENED.
26
A MICROELECTRONICS FAILURE HAS OCCURRED AND THE CONTROL IS OPERATING ON DEFAULTS.
27
A MICROELECTRONICS FAILURE HAS OCCURRED AND THE CONTROL IS DOWN DUE TO A FATAL FAULT.
28
THIS INDICATES THE SUPPLY FAN BINARY OUTPUT IS TURNED ON AND THE SUPPLY FAN OVERLOAD CIRCUIT
IS OPEN. THIS HAS TO OCCUR 3 TIMES WITHIN A TWO HOUR WINDOW.
29
THIS INDICATES THE OUTDOOR AIR HUMIDITY SENSOR IS OUT OF RANGE. WHEN THIS OCCURS, THE UNIT
CONTROLLER SWITCHES THE ECONOMIZER TYPE TO DRY BULB.
30
THIS INDICATES THE RETURN AIR HUMIDITY SENSOR IS OUT OF RANGE. WHEN THIS OCCURS, THE UNIT
CONTROLLER SWITCHES THE ECONOMIZER TYPE TO SINGLE ENTHALPY.
31
THIS INDICATES THE IAQ (CO2) SENSOR IS OUT OF RANGE. THE UNIT CONTROLLER CHANGES THE
VENTILATION MODE TO FIXED MINIMUM.
32
THIS INDICATES THE REAL TIME CLOCK CANNOT BE READ AS A RESULT OF A HARDWARE FAILURE.
33
THIS INDICATES THE SPACE TEMPERATURE OFFSET IS GREATER THAN 20 K OHMS.
34
THIS INDICATES THE CV/VAV INPUT IS OUT OF RANGE. THE UNIT WILL LOCK OUT.
35
THIS INDICATES THE 24-VOLT SUPPLY CIRCUIT HAS DROPPED BELOW THE ALLOWABLE LEVEL. THE CONTROL
WILL SHUT DOWN UNTIL THE VOLTAGE RISES ABOVE 19.2 VAC.
36
THIS INDICATES THE UNIT COOLING AND HEATING OPERATION IS SHUT DOWN BECAUSE THE UNIT IS
OPERATING IN A SMOKE PURGE MODE.
37
THIS INDICATES THE DUCT STATIC PRESSURE HAS EXCEEDED THE PROGRAMMED DUCT STATIC SHUTDOWN
SETPOINT.
38
THIS INDICATES THE SUPPLY AIR TEMPERATURE HAS EXCEEDED THE PROGRAMMED SUPPLY AIR TEMP
ALARM SETPOINT FOR COOLING.
39
THIS INDICATES THE SUPPLY AIR TEMPERATURE HAS EXCEEDED THE PROGRAMMED SUPPLY AIR TEMP
ALARM SETPOINT FOR HEATING.
40
41
THIS INDICATES THE SPACE TEMPERATURE IS ABOVE THE SPACE TEMP TRENDING ALARM TEMP AND MOVING
AWAY FROM THE SPACE TEMPERATURE SETPOINT.
42
THIS INDICATES THE DUCT STATIC HAS NOT RISEN QUICKLY ENOUGH IN A VAV UNIT WHEN THE SUPPLY FAN IS
ENERGIZED.
43
THIS INDICATES THE HYDRONIC HEAT FREEZE STAT HAS OPENED AND THE OUTDOOR TEMPERATURE IS
BELOW 45.0° F.
ALARM TROUBLE SHOOTING
Refrigerant System Alarm Codes
(01, 02, 03, 04, 09, 10, 11, 12)
The first 12 alarms involve controls intended to
protect the compressors. Each compressor system is
equipped with external circuitry monitoring hardware
intended to protect the compressor in case the operating
characteristics of the refrigerant system fall outside the
safe operating envelope for the compressor. The type of
protection varies depending on the type of compressor
used.
Low Pressure Cutout Alarm (09, 10, 11, 12)
Since tandem compressors are used there is a single low
pressure switch for system 1 and one for system 2. If
the low pressure switch opens both of the compressors
for that system will be turned off. If the low pressure
switch for system 1, (compressors 1A, 1B), opens it will
generate both a 09 and 10 alarm code. Likewise if the
low pressure switch opens for system 2, (compressors
2A, 2B), opens it will generate both an 11 and 12 alarm
code.
The low pressure switch opens at 50 PSIG and closes
at 71 PSIG. In order to generate a low pressure lockout
the high pressure switch must open three times within
a 2 hour window.
During the start up of the compressor system the low
pressure switch input is ignored for 30 seconds. After
the 30 second delay if the low pressure switch circuit
opens for 5 seconds the Unit Controller will turn off
both compressors for the system.
24 VAC power is supplied to the system 1 low pressure
switch circuit from wire 395 at terminal LPS1 of the P15
connector. The binary input back to the Unit Controller
from the low pressure switch is wire 396 at terminal
LPS1 of the P15 connector. The above input is then
jumpered to terminal LPS2 of the P15 connector.
24 VAC power is supplied to the system 2 low pressure
switch circuit from wire 433 at terminal LPS3 of the P16
connector. The binary input back to the Unit Controller
from the low pressure switch is wire 434 at terminal
LPS3 of the P16 connector. The above input is then
jumpered to terminal LPS4 of the P16 connector.
Limit Switch Alarms (13, 14, 15)
The control monitors the limit switch status for each of
the heating sections installed. If the limit switch circuit
opens the control de-energizes the heat section output
for the section with the open limit circuit and energizes
the indoor blower output. The supply fan performs a
Fan Delay Off when the limit re-closes.
In order to generate a limit lockout the limit switch must
open three times within a 2-hour window.
The limit input for heat section 1 is located at terminal
LIM1 wire 507 of the P10 connector. The limit input
for heat section 2 is located at terminal LIM2 wire 522
of the P10 connector. The limit input for heat section
3 is located at terminal LIM3 wire 533 of the P10
connector.
Gas Heating Alarms (16, 17, 18)
The Unit Controller monitors the output to the gas valve.
If the Unit Controller is calling for the operation of the
heat stage and voltage is not present after 5 continuous
minutes it will generate an alarm.
Space Temperature Sensor Alarm (19)
This alarm indicates the space temperature input is
either open or shorted. The display will show a value
of –40.0° F. The space temperature input is at ST and
GND of the P6 connector. To trouble shoot compare the
resistance of the input to the temperature in the space
using Table 8-1.
Supply Air Temperature Sensor Alarm (20)
This alarm indicates the supply air temperature input is
either open or shorted. The display will show a value
of –40.0° F. The supply air temperature input is at
SAT+ and SAT- of the P11 connector. To trouble shoot
compare the resistance of the input to the actual supply
air temperature using Table 8-1.
Return Air Temperature Sensor Alarm (21)
This alarm indicates the return air temperature input is
either open or shorted. The display will show a value
of –40.0° F. The return air temperature input is at
RAT+ and RAT- of the P11 connector. To trouble shoot
compare the resistance of the input to the actual return
air temperature using Table 8-1.
Outdoor Air Temperature Sensor Alarm (22)
This alarm indicates the outdoor air temperature input
is either open or shorted. The display will show a
value of –40.0° F. The outdoor air temperature input
is at OAT+ and OAT- of the P11 connector. To trouble
shoot compare the resistance of the input to the actual
outdoor air temperature using Table 8-1.
