10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Installation and operation manual
43
20. Maintenance and service
20.1. Maintenance introduction
In order to ensure optimal operation of the unit, a number of checks
and inspections should be carried out on the unit at regular intervals,
preferably yearly.
This maintenance shall be carried out by the installer or service
agent.
20.2. Service precautions
20.3. Service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2-21]. Refer to
"Refrigerant recovery/vacuuming
for details how to set mode 2.
When vacuuming/recovery mode is used, check very carefully what
should be vacuumed/recovered before starting. See the installation
manual of the indoor unit for more information about vacuuming and
recovery.
20.3.1 Vacuuming method
1
When the unit is at standstill, set the unit in [2-21]=1.
2
When confirmed, the indoor and outdoor unit expansion valves
will fully open.
At that moment H1P lights, the user interface of all indoor units
indicates TEST (test operation) and
(external control),
and operation will be prohibited.
3
Evacuate the system with a vacuum pump.
4
Press BS1 to stop vacuuming mode.
20.3.2 Refrigerant recovery operation method
This should be done by a refrigerant reclaimer. Follow the same
procedure as for vacuuming method.
21. Disposal requirements
Dismantling of the unit, treatment of the refrigerant, of oil and of other
parts must be done in accordance with relevant local and national
legislation.
22. Unit specification
22.1. General technical specifications
DANGER: Electrical shock
See
"2. General safety precautions" on page 2
.
CAUTION
When performing service to inverter equipment:
1
Do not open the electrical component box cover for
10 minutes after the power supply is turned off.
2
Measure the voltage between terminals on the
terminal block for power supply with a tester and
confirm that the power supply is shut off.
In addition, measure points as shown in the figure
below, with a tester and confirm that the voltage of the
capacitor in the main circuit is less than 50 V DC.
3
To prevent damaging the PC-board, touch a non-
coated metal part to eliminate static electricity before
pulling out or plugging in connectors.
For details refer to the wiring diagram labelled on the back
of the electrical component box cover.
NOTICE
Play it safe. For protection of the PCB, touch the switch
box casing by hand in order to eliminate static electricity
from your body before performing service.
TP2
C
＋
A2P
+
-
TP1
C
−
INFORMATION
For technical and electrical details of multi outdoor unit
combinations, see technical engineering data.
RWEYQ8
RWEYQ10
Casing material
Painted galvanised steel
Dimensions h x w x d
(mm)
1000x780x550
Weight
(kg)
137
137
Operation range (water side)
• cooling (min./max.)
(°C)
10/45
• heating (min./max.)
(°C)
(a)
10/45
(a) The lower limit is extendable till –10°C (heating operation mode) in case the brine
type setting is activated. (See
"Brine type setting" on page 36
)
Cooling
(b)
(b) Nominal cooling capacities are based on indoor temperature 27°C DB and
19°C WB, inlet water temperature 30°C, equivalent refrigerant piping: 7.5 m, level
difference: 0 m.
• capacity
(kW)
22.4
28.0
• EER
5.07
4.56
Heating
(c)
• capacity
(kW)
25.0
31.5
• COP
5.94
5.25
PED
• category
2
• most critical part
Liquid receiver
• PS*V
(bar*l)
200
Maximum number of indoor
units connected
(d)
64
Water connection
• inlet/outlet
External thread ISO228-G1 1/4B
• drain
Internal thread ISO228-G1/2B
Heat exchanger
• type
plate heat exchanger
• treatment
stainless steel
Compressor
• quantity
1
• model
inverter
• type
hermetically sealed scroll compressor
Sound level (nominal)
(e)
• sound power
(f)
(dBA)
50
51
• sound pressure
(g)
(dBA)
≤
70
Refrigerant
• type
R410A
• charge
(kg)
3.5
4.2
Refrigerant oil
Synthetic (ether) oil
Safety devices
• High pressure switch
• Fusible plug
• Inverter overload protector
• PC board fuse
