Daikin VRV IV RKXYQ8T7Y1B, Installation And Operation Manual

Page: 15 / 44

5 Installation
Installation and operation manual
15
8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
5.6 Charging refrigerant
5.6.1 Precautions when charging refrigerant
WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases. Its
global warming potential (GWP) value is 2087.5. Do
NOT vent these gases into the atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTICE
If operation is performed within 12 minutes after the
compressor unit, heat exchanger unit and indoor units are
turned on, the compressor will not operate before the
communication is established in a correct way between the
compressor unit, heat exchanger unit and indoor units.
NOTICE
Before starting charging procedures:
▪ In case of 5 HP: Check if the 7‑LEDs display is as
normal (see "6.1.4 To access mode 1 or 2" on
page 20 ), and there is no malfunction code on the
user interface of the indoor unit. If a malfunction code is
present, see
"8.1 Solving problems based on error
codes" on page 28 .
▪ In case of 8 HP: Check if the 7‑segment display
indication of the compressor unit A1P PCB is as normal
(see
"6.1.4 To access mode 1 or 2" on page 20 ). If a
malfunction code is present, see "8.1 Solving problems
based on error codes" on page 28 .
NOTICE
Make sure all connected units (heat exchanger unit +
indoor units) are recognised (setting [1‑5]).
5.6.2 To determine the additional refrigerant
amount
Additional refrigerant to be charged=R (kg). R should be rounded off
in units of 0.1 kg.
R=[(X
1
× Ø12.7 )×0.12+(X
2
× Ø9.5 )×0.059+(X
3
× Ø6.4 )×0.022]×A+B
X
1...3
=Total length (m) of liquid piping size at Øa
Parameter A and B :
Model Parameter A Parameter B
RKXYQ5 0.8 3.1 kg
RKXYQ8 1.0 2.6 kg
Metric piping . When using metric piping, please take into account
following table concerning the weight factor to be allocated. It should
be substituted in the formula for R.
Inch piping Metric piping
Size (Ø) (mm) Weight factor Size (Ø) (mm) Weight factor
6.4 0.022 6 0.018
9.5 0.059 10 0.065
12.7 0.12 12 0.097
5.6.3 To charge refrigerant
Charging refrigerant consists of 2 stages:
Stage Description
Stage 1: Pre-charging Recommended in case of larger systems.
Can be skipped, but charging will take longer
then.
Stage 2: Manual
charging Only necessary if the determined additional
refrigerant amount is
not reached yet by
pre-charging.
Stage 1: Pre-charging
Summary – Pre-charging :
Refrigerant bottle Connected to the service ports of the stop
valves. Which stop valves to use depends
on the circuits you choose to pre-charge to:
▪ Circuits 1 and 2 together (manifold with
refrigerant line splitters required).
▪ First circuit 1, then circuit 2 (or vice versa).
▪ Only circuit 1
▪ Only circuit 2
Stop valves Closed
Compressor Does NOT operate
1 Connect as shown (choose one of the possible connections).
Make sure that all compressor unit stop valves, as well as valve
A are closed.
Possible connections:
Manifold Connections Compressor unit
p< p>
R410A N2
b c e
a
d
B
A
Circuit 1 and 2
together
C
g
h
A
f
i
B
C
C
C
D
D
RDXYQ
RDXYQ
h
h
i
i
g
g
f
f
5 HP
8 HP
Only circuit 1
i B
h A
C
C
Only circuit 2
C
C
f B
g A
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve (circuit 2: to indoor units)
g Gas line stop valve (circuit 2: to indoor units)
h Gas line stop valve (circuit 1: to heat exchanger unit)
i Liquid line stop valve (circuit 1: to heat exchanger unit)
A, B, C Valves A, B and C
D Refrigerant line splitter
2 Open valves C (on line of B) and B.