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Contents
Before installing the FTC4 unit, make sure you read all the “Safety pre-
cautions”.
Please report to your supply authority or obtain their consent before
connecting this equipment to the power supply system.
Warning:
Precautions that must be observed to prevent injuries or death.
Caution:
Precautions that must be observed to prevent damage to the unit.
After installation, perform the test run to ensure normal operation. Then explain to
your customer the “Safety Precautions” *1, use, and maintenance of the unit based
on the information in this manual. This manual must be given to the user. This
manual must always be kept by the actual users.
*1 “Safety Precautions” for user is indicated on page 32.
: This indicates a part which must be grounded.
Warning:
Carefully read the labels attached to the unit.
Warning:
• The unit must not be installed by the user. Ask an installer or an authorized
technician to install the unit. If the unit is installed improperly, electric
shock, or fire may be caused.
• For installation work, follow the instructions in the Installation Manual and
use tools and pipe components specifically made for use with refrigerant
specified in the outdoor unit installation manual.
• The unit must be installed according to the instructions in order to mini-
mize the risk of damage by earthquakes, typhoons, or strong winds.
Improperly installed units may fall down and cause damage or injuries.
• The unit must be securely installed on a structure that can sustain its weight.
If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.
• All electric work must be performed by a qualified technician according to
local regulations and the instructions given in this manual. The unit must
be powered by dedicated power lines and the correct voltage and circuit
breakers must be used. Power lines with insufficient capacity or incorrect
electrical work may result in electric shock or fire.
• Only the specified cables can be used for wiring. Connections must be
made securely without tension on the terminals. If cables are connected or
installed improperly, it may result in overheating or fire.
• Terminal block cover panel of the unit must be firmly fixed. If the cover
panel is mounted improperly, dust and moisture may enter the unit, and it
may cause electric shock or fire.
• Make sure to use accessories authorized by Mitsubishi Electric and ask
an installer or an authorized technician to install them. If accessories are
improperly installed, it may cause electric shock, or fire.
• Do not remodel the unit. Consult an installer for repairs. If alterations or
repairs are not performed correctly, it may cause electric shock or fire.
• The user should never attempt to repair the unit or transfer it to another
location. If the unit is installed improperly, it may cause electric shock or
fire. If the FTC4 unit needs to be repaired or moved, ask an installer or an
authorized technician.
• During installing a heat pump system, keep water from splashing on the
FTC4 unit.
•
When installing sensors and parts, do not expose the terminals.
1.1 Before installation (Environment)
Caution:
• Do not install the FTC4 unit in outdoor location as it is designed for indoor
installation only. Otherwise electric shock or breakdown may be caused by
water, wind or dust.
• Do not use the unit in an unusual environment. If the FTC4 unit is installed or
exposed to steam, volatile oil (including machine oil), or sulfuric gas, or ex
-
posed to briny air, the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced,
flow, or accumulate. If combustible gas accumulates around the unit, it may
cause fire or explosion.
• When installing the unit in a hospital or in a building where communica-
tions equipment are installed, you may need to take measures to prevent
noise and electronic interference. Inverters, home appliances, high-
frequency medical equipment, and radio communications equipment can
cause the FTC4 unit to malfunction or to breakdown. At the same time, the
noise and electric interference from the FTC4 unit may disturb the proper
operation of nearby medical equipment, and communications equipment.
1.2 Before installation or relocation
Caution:
• Be very careful when moving the units. Do not hold the packaging bands.
Wear protective gloves to unpack and to move the units, in order to avoid
injury to your hands.
1.3 Before electric work
Caution:
• Be sure to install a circuit breaker. If it is not installed, there may be a risk
to get an electric shock.
• For the power lines, use standard cables of sufficient capacity. Otherwise,
it may cause a short circuit, overheating, or fire.
• When installing the power lines, do not apply tension to the cables. The
cables may be cut or overheated resulting in a fire.
• Make sure to ground the unit. Do not connect the ground wire to gas or
water pipes, lightning rods, or telephone grounding lines. If the unit is not
properly grounded, there may be a risk to get an electric shock.
• Make sure to use circuit breakers (ground fault interrupter, isolating switch
(+B fuse), and molded case circuit breaker) with the specified capacity. If
the circuit breaker capacity is larger than the specified capacity, break-
down or fire may result.
• Be sure to safely dispose of the packaging materials. Packaging materials,
such as nails and other metal or wooden parts may cause injuries.
• Do not wash the FTC4 unit. You may receive an electric shock.
1. Safety precautions ..................................................................................... 2
2. Installing the FTC4 unit ............................................................................. 3
3. System ...................................................................................................... 5
4. Electrical work ......................................................................................... 11
5. Dip switch setting .................................................................................... 26
6. Before test run ......................................................................................... 31
7. Main controller operation ......................................................................... 32
8. Troubleshooting ...................................................................................... 51
9. Multiple outdoor units control .................................................................. 56
10. Supplementary information (Pump down) ............................................... 69
Local application factors ................................................................................ 70
1. Safety precautions
FOR INSTALLER
“FTC4 (Master)” is the abbreviation of “Flow Temperature Controller [Master]”, which is described as “FTC4 (Master)” in this manual.
“FTC4 (Slave)” is the abbreviation of “Flow Temperature Controller [Slave]”, which is described as “FTC4 (Slave)” in this manual.
In this manual, “FTC4" that is not followed by “(Master)” or “(Slave)” means “FTC4 (Master and Slave)”.
Mitsubishi Electric is not responsible for the failure of locally supplied parts.
