Carrier 50EJQ Installation, Start-Up And Service Instructions Manual page 36

LED ERROR
DESCRIPTION
BLINKS CODE
1 — Normal Operation
2 HF-13 Compressor 1 Safety
3 HF-14 Compressor 2 Safety
4 HF-15 Thermostat Failure
5 HF-05 SAT Thermistor Failure
6 HF-06 OAT Thermistor Failure
7 HF-03 Space Temp. Sen. Failure
8 HF-12 RAT Thermistor Failure
Loss of Communications
9 SE-05
with Expansion board
10 HF-16 Control Board Failure
11 HF-17 Expansion Board Failure
LEGEND
DIP — Dual In-Line Package
LED — Light-Emitting Diode
Table 18 — I/O Channel Designations
Base Module
TERMINAL
NO.
T1-2 SPT (CCN) — 10K
T3-4 STO (CCN) — 10K
T5-6 OAT — 5K
T7-8 SAT — 5K
T9-10
T11-12
T13-14
T15-16
T17-25
T18-25
T19-25 W1 or Remote Start/Stop — DI (24 vac)
T20-25
T21-25
T22-25 Compressor 1 Safety — DI (24 vac)
T23-25 Compressor 2 Safety — DI (24 vac)
T24-25 Outside Air Enthalpy — DI (24 vac)
T26-27 Economizer Pos. — AO (4-20 mA)
T28-29 Heat 1 Relay — DO (24 vac)
T30-29 Heat 2 Relay — DO (24 vac)
T31-32 Power Exhaust 1/Modulating Pwr Exht — DO (115 vac)
T33-32 Power Exhaust 2 — DO (115 vac)
T34-35 Condenser Fan — DO (115 vac)
T36-35
T37-38 Reversing Valve Solenoid No. 1
T39-38 Reversing Valve Solenoid No. 2
K1 Indoor Fan Relay — DO (LV)
K2
K3
LEGEND
AO — Analog Output
CCN — Carrier Comfort Network
DI — Direct Input
DO — Direct Output
HV — High Voltage
K — Kilo-Ohms
LV — Low Voltage
NOTE: For all 4 to 20 mA signals, all even numbered terminals are negative (−)
polarity, and all odd numbered terminals are positive (+) polarity.
Table 17 — Control Board LED Alarms
The expansion board and control board flash the red LED in one-second intervals when the board is
operating properly.
The high or low pressure safety switch for compressor no. 1 has opened for 3 seconds. The error will
be cleared and compressor no. 1 will be allowed to turn on in 15 minutes. If the safeties have been
tripped 3 times in 90 minutes, compressor no. 1 will be locked out until the control board has been
manually reset.
The high or low pressure safety switch for compressor no. 2 has opened for 3 seconds. The error will
be cleared and compressor no. 2 will be allowed to turn on in 15 minutes. If the safeties have been
tripped 3 times in 90 minutes, compressor no. 2 will be locked out until the control board has been
manually reset.
The thermostat is calling for both heating and cooling at the same time. The unit will operate on a first
call basis and will automatically reset.
The supply-air temperature (SAT) sensor has failed. First check for wiring errors, then replace sensor.
The outside-air temperature (OAT) sensor has failed. First check for wiring errors, then replace sensor.
The space temperature sensor has failed. First check for wiring errors, then replace sensor.
The return-air temperature (RAT) sensor has failed. Ensure that DIP switch position 1 is in the closed
position and reset power. Then check for wiring errors. Finally, replace sensor.
Communications between the expansion board and the control board have been interrupted. Ensure
that an expansion board is installed and wired using the wire harness supplied with the expansion
module. If an expansion board is not used ensure that DIP switch position 3 is in the closed position,
and reset power.
Generated when hardware has failed on control board. Replace the control board.
Generated when hardware has failed on the expansion board.
Replace the expansion board.
ASSIGNMENT
Thermistor
Thermistor
Thermistor
Thermistor
—
—
—
—
Y1 — DI (24 vac)
Y2 — DI (24 vac)
W2 — DI (24 vac)
G — DI (24 vac)
OFC2 — DO (115 vac)
Compr. 1 — DO (HV)
Compr. 2 — DO (HV)
OAT — Outdoor-Air Temperature
OFC — Outdoor Fan Contactor
SAT — Supply-Air Temperature
SPT — Space Temperature
STO — Space Temperature Offset
T — Terminal
TROUBLESHOOTING
COMMENTS
Table 19 — I/O Channel Designations Expansion
TERMINAL
NO.
T1-2
T3-4
T5-6
T7-8
T9-10
T11-12
T13-14
T15-16
T17-25
T18-25
T19-25
T20-25
T21-25
T22-25
T23-25
T24-25
T26-27
T28-29
T30-29
T31-32
T33-32
T34-35
T36-35
T37-38
T39-38
K1
K2
K3
LEGEND
AI — Analog Input
DI — Direct Input
DO — Direct Output
IAQ — Indoor Air Quality
T — Terminal
NOTE: For all 4 to 20 mA signals, all even numbered terminals are negative (−)
polarity, and all odd numbered terminals are positive (+) polarity.
36
Module
ASSIGNMENT
—
—
—
—
—
IAQ Indoor — AI (4-20 mA)
IAQ Outdoor — AI (4-20 mA)
—
Fan Status — DI (24 vac)
Filter Status — DI (24 vac)
Field Applied Status — DI (24 vac)
Demand Limit — DI (24 vac)
Fire — Unit Shutdown — DI (24 vac)
Fire — Pressurization — DI (24 vac)
Fire — Evacuation — DI (24 vac)
Fire — Smoke Purge — DI (24 vac)
—
—
Alarm Light Indicator — DO (24 vac)
Power Exhaust Fire #1 — DO (115 vac)
Power Exhaust Fire #2 — DO (115 vac)
Power Exhaust Fire #3 — DO (115 vac)
Power Exhaust Fire #4 — DO (115 vac)
—
—
—
—
—