Daikin ER3DAT1 [4/10] Checks before initial start up
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Daikin ER3DAT1 [4/10] Checks before initial start up

Daikin ER5DAW1 [4/10] Checks before initial start up
Operation manual
3
ER3~10DA
Air-cooled condensing units
4PW00411-1C
As the refrigerant circulates through the unit, changes in its state or
condition occur. These changes are caused by the following main
components:
■
Compressor
The compressor (M1C) acts as a pump and circulates the
refrigerant in the refrigeration circuit. It compresses the
refrigerant vapour coming from the evaporator at the pressure at
which it can easily be liquefied in the condenser.
■
Condenser
The function of the condenser is to change the state of the
refrigerant from gaseous to liquid. The heat gained by the gas in
the evaporator is discharged through the condenser to the
ambient air, and the vapour condenses to liquid. A fan (M2F) is
used to accelerate this process.
■
Drier/filter
The drier/filter installed behind the condenser removes moisture
and small particles from the refrigerant to prevent blockage of
the expansion valve or the capillary tube with ice.
■
Evaporator
The evaporator is installed on the air conditioner and does not
belong to the condensing unit.
The main function of the evaporator is to take heat from the
ambient air by turning the liquid refrigerant, coming from the
condenser, into gaseous refrigerant.
■
Stop valves
The liquid line stop valve and the gas line stop valve allow an
easy connection to the air conditioner. They are used for vacuum
drying and for charging the unit with refrigerant. During normal
operation they must be opened completely.
■
Suction accumulator
The accumulator is installed between the evaporator and the
compressor. It prevents remaining liquid refrigerant, coming
from the evaporator, from entering the compressor. It also
prevents liquid hammer.
Safety devices
In its standard version, the unit is equipped with the following safety
devices:
■
Overcurrent relay
The overcurrent relay (F1S) is located in the switch box of the
unit and protects the compressor motor in case of overload,
phase failure or too low tension. The relay is factory-set and may
not be adjusted. When activated, it must be reset manually. (only
for ER3DA units)
■
Thermal protectors
The compressor motor of the ER3DA condensing unit is
equipped with a thermal protector (Q1M). The protector is
activated when the compressor temperature becomes too high.
When temperature returns to normal the protector resets
automatically.
The ER5DA, 8DA and 10DA condensing units are equipped with
a discharge thermal protector (Q1D). The protector is activated
when the temperature of the refrigerant leaving the compressor
becomes too high. When temperature returns to normal the
protector resets automatically.
■
High-pressure switch
The high-pressure switch is installed in the switch box of the unit
and measures the condenser pressure (pressure at the outlet of
the compressor). When the pressure is too high, the pressure
switch (S1PH) is activated. The unit stops and the fan of the air
conditioner remains on.
The switch is factory-set and may not be adjusted. When
activated, it must be reset manually.
■
Low-pressure switch
The low-pressure switch is installed in the switch box of the unit
and measures the suction pressure (pressure at the inlet of the
compressor). When the pressure is too low, the pressure switch
(S2PL) is activated. The unit stops and the fan of the air
conditioner remains on.
The switch is factory set and may not be adjusted. When the
pressure returns to normal, the switch resets automatically.
■
Reverse phase protector
The reverse phase protector (R1P) prevents the rotary and scroll
compressor from running in the wrong direction. When the unit
does not start, two phases of the power supply must be inverted.
ER3DAV1 units are not equipped with a reverse phase protector.
Internal wiring - Parts table
Wiring diagram: refer to the sticker on the unit. The abbreviations
used are listed below:
B1P..................Fan speed controller - electronic module (optional)
B2P..................Fan speed controller - pressure transducer (optional)
C1,2R ..............Run capacitor
C2S..................Start capacitor
C3R .................Run capacitor
E1H..................Crankcase heater
F1S..................Compressor overcurrent relay
F2,3,4U............Fuses (field supply)
K1M .................Compressor contactor
K2T..................Lock-out timer
K3T..................Start-up timer (optional)
K4A..................Overcurrent block relay
K7M .................Starting relay
M1C.................Compressor motor
M2,3F ..............Fan motor
Q1D .................Discharge thermal protector
Q1M.................Thermal protector compressor
R1P..................Reverse phase protector
R1S..................Resistor
S1PH ...............High-pressure switch
S2PL................Low-pressure switch
S3S..................Main isolator switch (field supply)
Z1F ..................Filter (optional)
B
EFORE
OPERATION
Checks before initial start-up
After the installation of both the condensing unit and the air
conditioner, check the following before switching on the circuit
breaker:
1.
Field wiring
Make sure that the field wiring between the local supply panel,
the condensing unit, the air conditioner and the remote control
has been carried out according to the instructions described in
the installation manual, according to the wiring diagrams and
according to European and national regulations.
2.
Fuses or protection devices
Check that the fuses or the locally installed protection devices
are of the size and type specified in the installation manual.
Make sure that neither a fuse nor a protection device has been
bypassed.
Make sure that the circuit breaker on the power supply
panel of the condensing unit is switched off. If the fan
motor of the air conditioner is connected to another supply
panel, make sure that the circuit breaker of that panel is
also switched off.

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