Installation Manual Owner manual

24
Table 8
Table 7
DISPLAY
CODE
INDICATION
01
Inverter Power Module Overcurrent
02
General Inverter Drive Fault
03
High Compressor Current
04
Current Sampling Error (Inverter)
05
High Inverter Heat Sink Temperature
06
High DC Bus Voltage (Inverter)
07
Low DC Bus Voltage (Inverter)
08
Low Line Voltage at Inverter
09
Line Overcurrent at Inverter
10
Line Voltage Sampling Error (Inverter)
11
Loss of Communication (Inverter Internal)
12
Inverter Heat Sink Sensor Failure
13
Loss of Communication (Inverter Internal)
14
Loss of Communication (IFB to Inverter)
15
Override, High Compressor Current
16
Override, High Line Current
17
Override, High Inverter Heat Sink Temp
18
Outdoor Fan Motor Fault
19
Low Pressure Switch Open
20
High Compressor Discharge Temperature
21
Interface Board Software Error
22
Sensor Failure - Suction Line Temperature
23
Sensor Failure - Compressor Discharge Temperature
24
Sensor Failure - Ambient Temperature
25
Sensor Failure - Coil Temp #1, Defrost
26
Sensor Failure - Suction Pressure Transducer
27
Blower Motor Fault
28
Blower Communication Fault
29
Cooling Low Ambient Lockout
Table 7. InterfaceBoardDiagnosticCodes
TROUBLESHOOTING - COOLING MODE
Diagnostic Display
The interface board located inside the control panel has a
two character display which provides information regarding
operational status and fault history. When 24VAC control
power is provided to the board, the display will show some
combination of characters. In order to diagnose a problem
with the unit, or to determine its operational status, remove
the control panel cover, then observe the 2-character
lighted display on the interface board. Refer to Table 7.
The display will alternate between an operating code as
shown in Table 17, (page 31) and a list of the codes
for up to the last 20 different faults or warnings. When
this list is being displayed, each fault or warning code in
memory will be displayed for 5 seconds. If one of the stored
coded conditions occurs again, no repeat entry will be
made. Thus, the fault codes in the list are not necessarily
displayed in order of occurrence. Fault codes are retained
through loss of power. The fault code list in memory can
be cleared by shorting the J4 Test pins briefly when the
compressor is off. NOTE: This action may also have other
consequences - See Delay Override on page 20.
FUNCTION TYPE CONNECTION
High Pressure
Switch
Opens 650 ±15 psig,
recloses 460 ±15 psig
See Figure 8 &
Figure 9
Low Pressure
Switch
Opens 20 ±5 psig,
recloses 35 ±5 psig
IFB* LP1-LP2
Ambient
Air Temp
Thermistor10KΩ @
25° C (Fig. 10)
IFB* “OUTDOOR TEMP”
(BLK)
Compressor
Discharge Temp
Thermistor10KΩ @
25° C (Fig. 10)
IFB* “DISCHARGE
TEMP” (RED)
Coil Saturation
Temp
Thermistor10KΩ @
25° C (Fig. 10)
IFB* “COIL #2
TEMP” (YEL)
Suction
Temp
Thermistor10KΩ @
25° C (Fig. 10)
IFB* “SUCTION TEMP”
(BLU)
*IFB=Interface Board
Table 8. Instrumentation List
TROUBLESHOOTING - HEATING MODE
If the furnace fails to operate check the following:
• Isthethermostatoperatingproperly?
• Aretheblowercompartmentdoor(s)inplace?
• Isthefurnacedisconnectclosed?
• Hasthecircuitbreakertrippedorthecontrolboardfuse
burnedopen?
• Isthegasturnedon?
• Areanymanualresetswitchesopen?
• Isthelterdirtyorplugged?
• Istheamesensorcoated?(Removeandcleanwith
steel wool. Do not use emery cloth or sandpaper!)
• Are all the LED’s on the furnace and motor control
boardsconstantlyON?Ifnot,refertoTable 9 & Table
10, (page 25) to determine fault condition.
IMPORTANT NOTE:
Thefurnacewilllockoutafter5failedattemptsfor
ignitionandwilltryagaineveryhourifthecallfor
heat remains.
Instrumentation
The 20 SEER iQ Drive split air conditioner includes
instrumentation as listed in Table 8. All items listed
are connected to the interface board except for the
high pressure switch. Refer to Figure 12 (page 30) &
Figure 13 (page 30), Figure 14 (page 31), Figure 15
(page 32), Figure 17 (page 34) & Figure 18 (page
35). The five temperature sensors are color coded so
that the color of the wire insulation matches the color of
the connector base on the left side of the circuit board.
All temperature sensors are 10k ohm thermistors. The
resistances of these sensors (when disconnected from the
interface board) may be checked against Figure 23 (page
39) for troubleshooting purposes. The charts show the
thermistor resistance-temperature curve broken into two
parts for ease of use.
Low Ambient Cooling
System control will modulate to allow safe operation in
low outdoor temperatures by controlling blower CFM,
compressor speed, and fan speed until an outdoor
temperature is less than 50
0
F. Unit is then disabled and
remains locked out until temperature has increased to ≥
55
0
F. Code 29 is displayed to indicate low cooling lockout.