Carrier 40 Operation & Service Manual page 28

ALARM Description
A09 Hot Gas Valve (HGS1)
high amp draw hi h d
A10 Quench Valve (BPV)
high amp draw hi h d
A11 Condenser Pressure Control
V l Valve (HGS2) high amp draw (HGS2) hi h
A12 Out–of–Range -- High Temper- g
ature t
A13 Out–of–Range Low Tempera- g
ture t
A14 Defrost Cycle >45 minutes y
A15 Setpoint out of range p
A16 Evaporator drain line heater
(DWR) malfunction
A17 Transformer/Rectifier Thermal /
Overload (RBT) Open O l d (RBT) O
A18 Electrical Heating Relay
(Future) (F t )
A19 Multi--Temp Liquid Solenoid
Valve (high amps draw) Valve (high amps draw)
[Future]
A20 Low Pressure Switch (LPS)
O Open (Standby) (St db )
A21 Compressor Contactor (MC) p
Open Circuit O Ci it
A22 Condenser Fan Motor (CFM)
O Open Circuit Ci it
A23 Hot Water Solenoid Valve
(HWV) Open Circuit (HWV) O
A24 Hot Gas Valve (HGS1) Open
Circuit Ci it
A25 Quench Valve (BPV) Open
Circuit Ci it
A26 Condenser Pressure Control
Valve (HGS2) Open Circuit V l (HGS2) O
A27 Evaporator Drain Line Heater p
(DWR) O (DWR) Open Circuit
A28 Heating Relay (EHR) Open g y (
Circuit (Future) Ci it (F t
62-10630
Table 3-1 Alarm Indications - - Continued
( ) Current draw of coil high or low (approx 1.6 amp)
Replace coil
( ) Current draw of coil high or low (approx 1.2 amp)
Replace coil
Current draw of coil high or low (approx 1.6 amp)
d
Replace coil
g p Unit out of range for 15 minutes
Verify cooling operation of unit
Hot gas solenoid open
p Unit out of range for more than 15 minutes
Verify heating operation of unit
Heating option not active (Set Configuration)
Unit terminated defrost after 45 minutes
Verify HGS1/HGS2 valve operation
g Operator entered invalid setpoint (outside of range)
Verify configuration settings
Replace heater
Line voltage low
Transformer winding open
High load on rectification system
g y Relay shorted
Wiring shorted
Valve coil shorted
Wiring shorted
( ) Unit undercharged
Liquid line filter--drier restricted
TXV strainer plugged with foreign material/ice.
TXV malfunction
Verify operation of evaporator fans
Failed switch
( ) Contactor coil open circuit
Wiring to coil open
( ) Condenser fan motor defective
Wiring to motor open
Valve coil shorted
Ci it
Wiring to coil open
( ) p Valve coil shorted
Wiring to coil open
( ) p Valve coil shorted
Wiring to coil open
Valve coil shorted
Ci it
Wiring to coil open
Evaporator drain heater shorted
Ci it
Verify wiring to heater
) p Relay open circuit
)
Wiring to coil open
CORRECTIVE ACTION
3-2
Reference
Paragraph
----
4.14.1
----
4.14.1
----
4.14.1
Verify Setting
----
4.14
Verify Setting
----
2.9
----
4.14
2.6
2.9
----
Correct
Replace
Correct
Replace
Correct
Replace
Correct
4.10.1
4.5
4.6
4.16
----
Replace
Replace
Check
4.13
Check
Replace
Check
4.14.1
Correct
Replace
Correct
4.14.1
Correct
Replace
Correct
Replace
Correct