Daikin VRV-WIII Installation Manual Download

Page: 11 / 22

English

Because the plate type heat exchanger has a structure which
does not permit disassembling and cleaning, follow the following
procedures for cleaning:

1) For maintenance purposes it is required to provide for a con-

nection port on the water inlet and on the water outlet. You must
connect a circulation pump inbetween these 2 connection ports
when cleaning the plate heat exchanger with chemicals.
For cleaning the scale in the plate heat exchanger it is recom-
mended to use a solution with 5% diluted formic, citric, oxalic,
acetic or phosphoric acid.
Never use hydrochloric, sulfuric or nitric acid because such
solutions have a strong corrosive feature.

2) Make sure to provide for a stopvalve in front of that inlet water

pipe connection port and for a stopvalve after the outlet water
pipe connection port.

3) Connect the piping for circulation of cleaning chemicals to the

inlet piping of plate type heat exchanger. Fill the cleaning solu-
tion of 50 - 60°C for a while in the plate type heat exchanger.
Then, circulate the cleaning solution by a pump for 2-5 hours.
The time for cleaning depends on the temperature of cleaning
solution or the degree of scale accumulation. Therefore,
please watch the change of the dirtiness (color) of cleaning
solution to determine the level of removal of scale.

4) After circulating the cleaning solution, discharge the solution

from the plate type heat exchanger, fill the heat exchanger with
a solution of 1-2% sodium hydroxide (NaOH) or sodium bicar-
bonate (NaHCO

). Circulate this solution for 15-20 minutes for

neutralization purpose.

5) After the process of neutralization has been completed, rinse

the inner part of the plate type heat exchanger with care using
fresh and clean water.

6) When using any cleaning agent sold in the market, check in

advance that such agent has no corrosive features against
stainless steel and copper.

7) For details of cleaning method, ask the manufacturer of related

cleaning agent.

After cleaning has been completed, make sure that the unit can
be operated in a normal fashion.

FIELD WIRING

Caution

• All field wiring and components must be installed by a licensed

electrician and must comply with relevant local and national
regulations.

• The field wiring must be carried out in accordance with the wiring

diagrams and the instructions given below.

• Be sure to use a dedicated power circuit. Never use a power sup-

ply shared by another appliance.

• Do not operate until refrigerant piping work is completed.

(If operated before complete the piping work, the compressor may
be broken down.)

• Never remove thermistor, sensor or etc. when connecting power

wiring and transmission wiring.
(If operated with thermistor, sensor or etc. removed, the compres-
sor may be broken down.)

• Be sure to install an earth leak detector.

(This unit uses an inverter, so install the earth leak detector that
be capable of handling high harmonics in order to prevent mal-
functioning of the earth leak detector itself.)

• This product have reversed phase protection detector that only

works when the product started up.

• Do not run the unit by short cutting the protection device (S1PH).

If there exists the possibility of reversed phase, lose phase,
momentary black out or the power goes on and off while the prod-
uct is operating, attach a reversed phase protection circuit locally.
Running the product in reversed phase may break the compres-
sor and other parts.

• Attach the power wire securely.
• Introducing power with a missing N-phase or with a mistaken

N-phase will break the equipment.

8-1 Optional parts

Note

•

When using the adaptor for sequential start, refer to chapter
“Examples”.

• For connection wiring to the central remote controller, refer to the

installation manual of the central remote controller.

8-2 Power circuit and cable requirements

A power circuit (see table below) must be provided for connection of
the unit. This circuit must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leak detector.

When using residual current operated circuit breakers, be sure to use
a high-speed type 200mA rated residual operating current.

Note

•

Use copper conductors only.

• Use insulated wire for the power cord.
• Select the power supply cable in accordance with relevant local

and national regulations.

• Wire size must comply with the applicable local and national code.
• Specifications for local wiring power cord and branch wiring are in

compliance with IEC60245.

• WIRE TYPE H05VV(*)

*Only in protected pipes, use H07RN-F when protected pipes are
not used.

8-3 General

• Up to 3 units can be connected by crossover power source wiring

between outside units. For details, refer to the equipment design
data and technical data.

• Make sure to connect the power source wire to the power source

terminal block and to clamp it as shown in figure 8, chapter “Field
line connection”.

• As this unit is equipped with an inverter, installing a phase

advancing capacitor will not only deteriorate power factor
improvement effect, but also may cause capacitor abnormal heat-
ing accident due to high-frequency waves. Therefore, never install
a phase advancing capacitor.

• Keep power imbalance within 2% of the supply rating.

Large imbalance will shorten the life of the smoothing capaci-
tor.

As a protective measure, the product will stop operating and
an error indication will be made, when power imbalance
exceeds 4% of the supply rating.

• Follow the “electrical wiring diagram” when carrying out any elec-

trical wiring.

• Only proceed with wiring work after blocking off all power.
• Always ground wires. (In accordance with national regulations of

the pertinent country.)

• Do not connect the ground wire to gas pipes, sewage pipes, light-

ning rods, or telephone ground wires.

Gas pipes:

can explode or catch fire if there is a gas leak.

Sewage pipes:

no grounding effect is possible if hard plastic pip-

ing is used.

Telephone ground wires and lightning rods:

dangerous when

struck by lightning due to abnormal rise in electrical potential in
the grounding.

• This unit is equipped with an inverter device. The earth must be

connected in order to eliminate impact of the generated electro-
magnetic noise on other devices and to prevent leaked current
from being charged on the outer casing of the unit.

• Earth leak detector which are especially for protecting ground-

faults should be used in conjunction with main switch or fuse for
use with wiring.

• Connect the wire securely using designated wire and fix it with

attached clamp without applying external pressure on the termi-
nal parts (terminal for power wiring, terminal for transmission wir-
ing and earth terminal). See “field line connection”.

• Never connect the power supply in reversed phase.

(This product have reversed phase protection detector.
If the detector operate, replace two of the three phases
(L1, L2 and L3).)

Phase and

frequency

Voltage

Minimum

circuit amp.

Recom-

mended

fuses

Transmission

line selection