Installing Heat Insulation; Mounting Thermistors; Electrical Wiring - Fujitsu UTP-VX60A Installation Manual

5.5. Installing heat insulation

After checking for gas leaks (refer to the Installation Manual of the outdoor unit),
perform this section. Failure to do so may cause water leaks.
Implement heat insulation as shown in the diagram below.
(1) Mount the rubber sheets (accessories).
(2) Mount the heat insulations (accessories). There should be no gaps between the
insulation and the product.
(3) Secure to a pipe using 2 cable ties.
(2) Heat insulations
(Accessories)
(3) Cable ties
(Large, accessories)
• Perform the work in (1), (2) and (3) for the 2 pipes.
• For the heat insulation on the separation tube (Optional parts) used to connect 2 EEV
units ,refer to the installation manual of the separation tube.

6. MOUNTING THERMISTORS

• To prevent water from accumulating on top of the thermistor, orient the thermistor wires
downwards when mounting the thermistor.
• Make good contact between thermistor and air handling unit. Put the top of the thermis-
tors on the air handling unit, this is the most sensitive point of the thermistor.
Mounting thermistors to general indoor units
General indoor unit
Refrigerant fl ow
during cooling
EEV
kit
A: Heat exchanger inlet pipe
Braze a thermistor holder pipe (Ø 6.35, accessory) in front of the distributor branch.
Use a thermistor spring (accessory) to tightly seal and secure the thermistor (Φ4, acces-
sory) pipes.
(1) Thermistor holder pipe
(Ø 6.35 mm)
(2) Thermistor (Ø 4 mm)
(3) Thermistor spring
* Attach this thermistor in a location where the evaporating temperature can be detected
during cooling operation.
B: Heat exchanger outlet pipe
Braze a thermistor holder pipe (Ø 9.53, accessory) to the heat exchanger outlet pipe.
Use a thermistor spring (accessory) to tightly seal and secure the thermistor (Ø6, acces-
sory) pipes.
Heat Ex-
changer
En-7
CAUTION
(1) Butyl rubber sheets
(Accessories)
No gap
Air inlet
C
A B
Heat
Exchanger
D
Air outlet
(1) (2)
(3)
Heat
Exchanger
(3)
(2)
(1)
Distributor
(1)
(2)
(3)
(1) Thermistor holder pipe
(3)
(Ø 9.53 mm)
(2) Thermistor (Ø 6 mm)
(2)
(3) Thermistor spring
(1)
C: Inlet air thermistor/D: Outlet air thermistor
Install in a location where the effects of heat sources such as heat exchangers and heat-
ers, etc., are minimized as far as possible.
Inlet air thermistor
(Accessories)
General indoor unit
C
Air inlet

7. ELECTRICAL WIRING

Electrical work must be performed in accordance with this Manual by a person
certifi ed under the national or regional regulations. Be sure to use a dedicated circuit
for the unit. An insuffi cient power supply circuit or improperly performed electrical work
can cause serious accidents such as electric shock or fi re.
Before starting work, check that power is not being supplied to the all units.
Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insuffi cient insulation, or exceeding the allowable
current can cause electric shock or fi re.
For wiring, use the prescribed type of cables, connect them securely, making sure
that there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as
overheating the terminals, electric shock, or fi re.
Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insufficient insulation, or exceeding the allowable
current can cause electric shock or fi re.
Match the terminal board numbers and connection cable colors with those of the
outdoor unit (or RB unit). Erroneous wiring may cause burning of the electric parts.
Securely connect the connection cables to the terminal board. In addition, secure the
cables with wiring holders. Improper connections, either in the wiring or at the ends of
the wiring, can cause a malfunction, electric shock, or fi re.
Always fasten the outside covering of the connection cable with the cable clamp. (If
the insulator is chafed, electric discharge may occur.)
Securely install the electrical box cover on the unit. An improperly installed electrical
box cover can cause serious accidents such as electric shock or fi re through exposure
to dust or water.
Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
Install an earth leakage breaker. In addition, install the earth leakage breaker so that
the entire AC main power supply is cut off at the same time. Otherwise, electric shock
or fi re could result.
Always connect the earth (ground) cable.
Improper earthing (grounding) work can cause electric shocks.
Install the remote controller cables so as not to be direct touched with your hand.
Perform wiring work in accordance with standards so that the DX-kit can be operated
safely and positively.
Connect the connection cable fi rmly to the terminal board. Imperfect installation may
cause a fi re.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualifi ed persons in order to avoid a hazard.
Take special precaution for connection to the external controller (DDC, fi eld supply).
Make sure the wiring for the external input and output signals is correct.
Miswiring of these cables could damage the entire system.
Outlet air thermistor
(Accessories)
D
Air outlet
WARNING