Carrier 25VNA User Manual

13
Table 6—25VNA EVENT / FAULT
OPERATION
FLASH CODE
(Amber LED)
Heat or Cool
Mode
Possible Causes ACTION
Standby/Charging ON, no flash --- --- --- --- --- --- --- --- ---
Variable Capacity 1, pause --- --- --- --- --- --- --- --- ---
Variable Capacity (Range
Cutback)
1(1secON),
longer pause (2
second OFF)
Both
Pressure T rip Cutback: 2 or more
High Pressure Trips occurred in
past 2 hours
System will self ---mitigate, persistent con-
ditions will lead to lockout (r ef er to E r ror
Code 84)
High Load Cu t back: 2 or more
Torque Limit Trips occurred in the
past 2 hours
System will try to self ---mitigate, persist-
ent conditions will lead to lockout (refer
to Error Code 99)
Flank Loading Cutback: Flank Load
is too high, ODU raising speed
(shrinking capacity range) to im-
prove reliability
System will try to self ---mitigate, persist-
ent conditions will lead to lockout (refer
to Error Code 99)
Heat
Oil Circulation cutback: Suction
Pressure too high for current com-
pressor speed; ODU reducing
speed to improve oil circulation
check for Indoor airflow restrictions
Emergency Mode Continuous Flash Both
Regular T ---Stat used in Emergency
mode: Nominal Capacity only (fixed
speed operation)
install Infinity User Interface
Event 16 Both
Loosewireorshortedleads
Verify communications wiring (ABCD);
check for loose connection, stripped
wires, short to ground or short between
wires
Wrong Model Plug Installed Verify correct model plug installed
Damaged Model Plug
Check model plug for corrosion or
breakage; replace if necessary
DataBuslockedupbypowerloss,
brownout or glitch
Cycle Power to system
Damaged ODU control Replace ODU control
Event 25 Both
Wrong Model Plug Installed Verify correct model plug installed
Damaged Model Plug
Check model plug for corrosion or
breakage; replace if necessary
Damaged ODU control Replace ODU control
Event 31 Both High Pressure Event
System will self ---mitigate, persistent con-
ditions will lead to lockout (r ef er to E r ror
Code 84)
Event 32 Both Low Pressure Event
System will self ---mitigate, persistent con-
ditions will lead to lockout (r ef er to E r ror
Code 83)
System Malfunction 45 Both Damaged ODU control Replace ODU control
Event 46 Both low line voltages if persistent contact power provider
System Malfunction 48 Both
Loose or disconnected harness (CC
@ HP control, CC @ contactor, IN-
VERTER @ HP control, INVERTER
@inverterdrive)
Verify good harness connection
Loosewireorshortedleads
Verify communications wiring (”Inverter”
harness); check for loose connection,
stripped wires, short to ground or short
between wires; confirm good connection
is made at control board and at Inverter
Contactor not pulled in
Verify contactor harness from ODU con-
trol (”C C” harness); check f or loose con-
nection, stripped wires, short to ground
or short between wires; confirm good
connection is made at control board and
at contactor
Damaged Contactor C oil
if wiring is ok measure across the con-
tactor coil for 18VAC --- 32VAC; if voltage
is present measure across contactor ter-
minals 21 & 23 for line voltage if absent
then contactor is damaged
Damaged ODU Control
confirm ~ 5VDC on pins 3 & 4 of ”Invert-
er” pin out connection on ODU control if
absent board is damaged
Possible damage to Inverter Drive
Change out ODU control before Inverter
Drive; if this does not help then change
out the Inverter drive

Carrier 25VNA Specifications

General

Brand	Carrier
Model	25VNA
Category	Heat Pump
Language	English