Field Wiring - Daikin RWEYQ72 Engineeiring Data

EDUS30-900-N
[NOTES]
(1) The circle marks in the columns for corrosion or scale to develop.
(2) Corrosion has a tendency to occur when water temperature is high
(104 °F or more), and if metals with no protective coating whatever
are directly exposed to water, it would be a good idea to take effec-
tive measures against corrosion such as adding a corrosion inhib-
itor or deaeration treatment.
(3) In a condenser water circuit that uses a closed cooling tower, the
closed circuit circulating water and make-up water must satisfy its
water quality standards for the hot water system, and passing
water and make-up water must satisfy those for the circulation
type cooling water system.
(4) The supply water must be clean tap water, industrial water or clean
underground water.
Do not use purified or softened water.
(5) The fifteen items in the previous table above represent typical
causes of corrosion and scale.
(6) Once through water may cause corrosion.
Do not use once through water.
7-5 Maintenance of plate type heat exchanger
The performance of a plate type heat exchanger may decline due to
scale accumulation. It may be damaged by freezing due to the drop of
flow rate. For this reason, it is necessary to carry out programmed
maintenances at a regular interval in order to prevent the scale from
being generated.
1.
Before entering the season for use, carry out the following
inspections:
1) Conduct a water quality test and make sure that it is within the
standard.
2) Clean the strainer.
3) Make sure that the flow rate is correct.
4) Make sure that the operational conditions (pressure, flow rate,
outlet temperature, etc.) are normal.
2.
Because the plate type heat exchanger has a structure which does
not permit disassembling and cleaning, follow the following proce-
dures for cleaning:
1) For maintenance purposes it is required to provide for a connec-
tion 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 and outlet piping of plate type heat exchanger. Fill the
cleaning solution of 122 - 144 °F 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
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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.
3.
After cleaning has been completed, make sure that the unit can be
operated in a normal fashion.
Installation of Outdoor Units
8.

FIELD WIRING

NOTE
• All field wiring and components must be installed by a licensed
electrician and must comply with relevant local and national regu-
lations.
• 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 downdamaged.)
• Never remove thermistor, sensor or etc. when connecting power
wiring and transmission wiring.
(If operated with thermistor, sensor or other part removed, the
compressor may break down or become damaged.)
• Be sure to install a ground fault circuit interrupter.
(This unit uses an inverter, so install a ground fault circuit inter-
rupter that be capable of handling high harmonics in order to pre-
vent malfunctioning of a ground fault circuit interrupter itself.)
• This product have has a reversed phase protection detector, how-
ever this only works when the product is started up.
• Replace two of the three phases (L1, L2, and L3) during reverse-
phase protection circuit operation.
Reversed phase detection is not performed while the product is
operating.
• 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 compressor
and other parts.
• Attach the power wire securely.
8-1 Optional parts
COOL/HEAT Selector
S1S .............................. Selector switch (fan, cool/heat)
S2S .............................. Selector switch (cool/heat)
NOTE
• Use copper conductors only.
• When using the adaptor for sequential start, refer to chapter
"Examples".
• For connection wiring to outdoor-outdoor transmission F1-F2, out-
door-indoor transmission F1-F2, refer to chapter "Examples".
• For connection wiring to the central remote controller, refer to the
installation manual of the central remote controller.
• Use insulated wire for the power cord.
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, use Maximum Overcurrent Protection on
each phase and a ground fault circuit interrupter.
Phase and
Voltage
frequency
RWEYQ72/84PTJU  3, 60 Hz 208-230V
RWEYQ144/168PTJU  3, 60 Hz 208-230V
RWEYQ216/252PTJU  3, 60 Hz 208-230V
NOTE
• 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 local cord.
Installation
Minimum Max. Overcur- Transmission
circuit amp. rent Protection line selection
22.4A 40A AWG18-16
44.8A 40+40A AWG18-16
67.1A 40+40+40A AWG18-16
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