4
C
HARGING
REFRIGERANT
The cooling only unit does not require any additional charging of
refrigerant.
The heatpump unit however, requires additional charging of
refrigerant according to the length of pipe connected at the site.
Take the following steps for proper charging.
A
DDITIONAL
CHARGING
OF
REFRIGERANT
Find the correct amount of additional refrigerant to charge (G)
(unit of measurement = kg) using one of the following formulas.
Pair system
(Refer to figure 5A)
(One way length of liquid pipe = L (unit of measurement = m))
RY200
G = (L-7.5) x 0.03
RY250
G = (L-7.5) x 0.05
Simultaneous operation system
(Twin, triple, double twin)
(Refer to figure 5B, C and D)
RY200
Ø9.5
RY250
Ø6.4
A = 0.015 kg/m
A = 0.005 kg/m
G = (L1-7.5) x 0.03 + L2xA + L3xA + L4xA + L5xA + L6xA + L7xA
G = (L1-7.5) x 0.05 + L2xA + L3xA + L4xA + L5xA + L6xA + L7xA
• L1: one way length of main liquid pipe.
(Unit of measurement = m).
• L2, L3, L4, L5, L6, L7: branched pipes.
(Unit of measurement = m).
C
OMPLETE
CHARGING
OF
THE
REFRIGERANT
- When the entire refrigerant pipe length is 7.5 meters, charge the
refrigerant in accordance with the amount mentioned in the
nameplate.
- When the pipe length exceeds 7.5 meters, the charging amount
mentioned in the nameplate and that required for additional
charging are to be totalled as the net charging amount.
- When the entire refrigerant pipe length is below 7.5 meters
reduce the refrigerant amount charge mentioned in the
nameplate as specified in the table.
R200
50 g/m
R250
90 g/m
RY200
100 g/m
RY250
170 g/m
Caution
Recuperate overcharged refrigerant according to local and
national regulations.
F
IELD
WIRING
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 supply shared by another appliance.
Fix cables as shown in the figure below and make sure they do not
make contact with the pipes (Especially on high pressure side).
1
2
3
N
L
1
L
2
L
3
1
3
2
Branched
pipe
1. Power supply intake
2. Switch block
3. Terminal block
Make sure to connect power supply cables in normal phase.
If connected in reverse phase, the remote controller of indoor unit
indicates “U1” and the equipment cannot operate. Change any two
of the three power supply cables (L1, L2, L3) to correct phase.
If the contact in the magnetic switch should be forcibly turned on
while the equipment is inoperative, the compressor will be damaged
by a fire. Never try to forcibly turn on the contact.
• Never squeeze bundled cables into a unit.
• Follow the electric wiring diagram and the nameplate for
electrical wiring works.
• Grounding resistance should be 500
Ω
or less.
