2023 Ductless Service Training Day 1 Quiz

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.

2023 Ductless Service Training Day 1 Quiz

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