2024 Ductless Service Training Day 2 Test

No matter where you read the current fault code (indoor, outdoor or wall control) the fault code will always be the same?

True
False

Some fault codes may be indicated by flashing LED’s on the indoor or outdoor boards?

True
False

To properly charge a unit you must know the __________.

super heat
sub-cool
line lengths
speed of the compressor
suction pressure

The 601, 701 and 801 controls are

all 5 volts DC
all 12 volts DC
Interchangeable
all 24 volt AC
unit specific

A 24 volt interface is used _______________

anytime you want to use a 24 volt thermostat.
to make the system more efficient.
if the ductless outdoor is paired with a standard air handler or gas furnace.
all of the above.
A & B
A&C

A wireless control is used for __________________

mode and temperature control.
system setup.
service data.
all of the above.
A & C
B & C

The new service codes are _______________

Error or Fault
Protection or Limit
Error, Protection. Fault and Limit
Error and Limit
Error, Protection. Fault
Error, Protection and Limit

The second digit of the Error code shows ____________

equipment where the fault occured.
mode when the fault occurred
hour when the fault occurred.
the specific fault.

A function code will

always shut down the system.
give operating information.
lock system in cool mode.
lock system in heat mode.

The most common fault on start up is ________________

low charge.
over charge
compressor failed.
communication fault.

Standard wiring between the indoor and the outdoor is ________.

18 gauge thermostat wire
14/3 with ground solid wire
14/3 with ground stranded wire
16/3 shielded wire
it does't matter as long as it is good

If there is high electromagnetic interference (EMF) causing communication issues you should

replace the indoor board.
install 14/2 shielded wire on 2(L2) and 3(S).
replace outdoor board
replace outdoor unit
replace indoor unit.

If you need to splice the communication wires you may

solder the wires
use wire nuts
use butt connectors
not splice

Communication is carried on which wires?

S (3)
S(3) & ground
L1 (1) and S (3)
L2 (2) and S (3)

An external drain safety should break?

S (3)
L1 (1)
L2 (2)
Internal shut down terminals

Communication voltage is?

about 24 VAC
about 50 VDC positive
alternating between about +50 to -50 VDC.
about 50 VDC negative.

Induced current on the S (3) wire is due to?

bare spots in the insultation of the wire.
magnetic field induced to wire if it is twisted around the power wire.
incoming voltage above 250 volts.
failed reactor.
Solar flares

Which indoor units have a display board?

All of them.
High wall and cassette
Cassette and console.
Console and ducted.
High wall and ducted.

Ductless outdoor units have

1 board
2 boards
3 boards
up to 3 boards

Static pressure can be set on the _____________

Cassette unit.
ducted unit.
console unit.
high wall unit.
1 & 3
2 & 4

Anti cold air function is to _______________

keep from blowing cold air during heat mode.
shut down unit when blows too cold of air during cooling.
speed up the fan so it does not blow too cold of air.
bring on electric heat during defrost to offset the cold air.

As shipped from the factory, in cool mode the indoor fan in auto selection

shuts off when temperature is satisfied.
runs 90 seconds after temperature is satisfied.
Runs continuous at minimum speed
runs continuous at high speed.

All of the outdoor units have

Display boards.
Diagnostic lights.
Board and lights.
board and/or lights.

On the 24 volt interface a code reading 20 means_______.

the compressor is running at 20 HZ.
system is running at 20% capacity.
board is mounted upside down and system is cool mode.
board is mounted upside down and system is heat mode.

The term ductless system means

there is no duct work.
there may be ductwork but the indoor communicates directly to the outdoor unit.
the out door unit is classified as part of a ductless system but the indoor may be ductless or ducted.
Is getting more confusing as more products are being added.
3&4
All of the above.

The Debugger tool can be used to ramp the compressor up and down when attached to the outdoor unit?

True
False

The debugger tool can be used to simulate the indoor or outdoor unit to verify communication faults?

True
False

The The Debugger tool connects to

L1(1), L2(2) and S(3) terminals
Outdoor main board
Retrieving data. Wait a few seconds and try to cut or copy again.
Fan driver board
All of the above

With the Debugger tool do you need an indoor unit connected to operate the outdoor unit?

Indoor unit must be piped in
indoor unit must be electrically connected
indoor unit is not needed

Induced voltage on the S wire as low as 6 volts can interfere with communication.

True
False

The most frustrating codes to diagnose are

P4/P6
E1
F1, F2, F3 and F4
P4/P6 and E1
F codes and P1 and P2

The speed of the compressor is controlled by

length of time 6 switches in the IGBT are open and closed.
Retrieving data. Wait a few seconds and try to cut or copy again.
the AC voltage output of the board.

Multi-head ductless ________________

can heat and cool at the same time
will cool the room calling first then heat the next room
will heat the room calling first then cool the next room
go to stand by until all units are in the same mode

Using the wireless remote in the service menu you can program the blower from running continuously during the off cycle in cool mode

FALSE
True, but you shouldn't due to air circulation

With the ducted unit it is preferred to set static pressure by

Using the service menu and set manually
Always leave at factory setting
Automatic setting
Use the dip switches on the control board

Using the System Enquiry function from the Multi-zone outdoor unit you can tell if you have your communication wiring matched to the correct piping?

TRUE
FALSE

On a 1-1 indoor coil freeze up fault is the same as refrigerant leak detection?

TRUE
FALSE

On a multi-zone any unit not calling will close its EEV

100%.
50%
10%.
3%.
left in last position.

When the unit is in protection mode, the unit will ___________.

Shut down and show a fault.
Continue to run at requested demand and show a fault
Run at a reduced demand without a fault
Run at a reduced demand and show a fault
Run at a reduced demand and may show a code

Compressor discharge protection starts at

194 degrees
150 degrees
215 degrees
239 degrees

High compressor discharge temperature is most likely caused by

Dirty outdoor coil in cool mode
Dirty indoor coil in heat mode
System overcharge
System Under charge

The condenser fan speed is controlled by the

Outdoor temperature
The indoor demand of the system
Compressor demand of the system
Outdoor coil sensor
All of the above
1 & 4

If the compressor temperature is between 215 and 229 degrees the compressor will

increase frequency to meet demand if the indoor system
decrease frequency to protect the compressor
hold frequency to provide comfort while protecting compressor
shut down until compressor cools

Where would you install a liquid line filter drier in a ductless system?

Liquid line outdoor
Liquid line indoor
Mixed phase line outdoor
Mixed phase line indoor
You don't

The Check Point function on a multi-head

is for fault codes.
is for compressor operation.
is for outdoor unit operating status
is for indoor operating status.
All of the above.

On a multi-head outdoor unit the display normally

is blank.
shows a timer for the delay.
shows compressor HZ.
shows number of indoor units connected.

When using the check point function you can see

suction pressure.
head pressure
refrigerant charge amount
capacity of each indoor unit

When using the check point function you can see

total frequency demand of all indoor units
frequency of compressor after any limits
capacity demand of each indoor unit
all of the above.
none of the above.

Using the check point function what would be the most useful point to check?

Compressor discharge temperature.
Compressor frequency.
Last error code.
EXV open angle
indoor coil temperature
Evaporator coil temperature.

When using the Debugger Tool you

Can use LNS and 5V at the same time.
can only use LNS or 5V independently.
Must have the switch in LNS before powering the outdoor unit
Must have the switch matching how you have it connected before powering the outdoor unit.
1&3
2&4

2024 Ductless Service Training Day 2 Test

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