Pipe Connections Between Indoor And Outside Unit; Refrigerant Piping System - LG ARWB200LAS4 Installation Manual

16
Flow switch work
- It is recommended to install the flow switch to the water collection
pipe system connecting to the outside unit.
(Flow switch acts as the 1st protection device when the heat water is
not supplied. If a certain level of water does not flow after installing
the flow switch, an error sign of CH24 error will be displayed on the
product and the product will stop operating.)
- When setting the flow switch, it is recommended to use the product
with default set value to satisfy the minimum flow rate of this prod-
uct. (The minimum flow rate range of this product is 50%. Reference
flow rate : 10HP – 96LPM, 20HP – 192LPM
- Select the flow switch with the permitted pressure specification con-
sidering the pressure specification of the heat water supply system.
(Control signal from outside unit is AC 220V.)
Installation of flow switch
- The flow switch must be installed at the horizontal pipe of the heat
water supply outlet of the product and check the direction of the heat
water flow before the installation. (Picture 1)
- When connecting the flow switch to the product, remove the jump
wire to connect to the communication terminal (5(A) and 5(B)) of the
outside unit control box. (Picture 2, 3) (Open the cover of the flow
switch and check the wiring diagram before connecting the wires.
The wiring method can differ by the manufacturer of the flow switch.)
- If necessary, adjust the flow rate detection screw after consulting
with an expert and adjust to the minimum flow rate range. (Picture 4)
(Minimum flow rate range of this product is 50%. Adjust the flow
switch to touch the contact point when the flow rate reaches 50% of
the flow rate.)
- Reference flow rate : 10HP – 96LPM, 20HP – 192LPM)
Picture 1 Picture 2
! CAUTION
• If the set value does not satisfy the minimum flow rate or if the
set value is changed by the user arbitrarily, it can result in prod-
uct performance deterioration or serious product problem.
• If the product is operated with the heat water supply not flow-
ing smoothly, it can damage the heat exchanger or cause seri-
ous product problems.
• In case of CH24 or CH180 error, there is a possibility that the
plate type heat exchanger is partially frozen inside. In this case
resolve the issue of partial freezing and then operate the prod-
uct again. (Cause of partial freezing : Insufficient heat water
flux, water not supplied, insufficient coolant, alien particle pene-
trated inside plate type heat exchanger)
• When the product operates while the flow switch touches the
contact point at the flow rate range out of the permitted range,
it can cause product performance deterioration or serious prod-
uct problem.
• Must use the normal closed type flow switch
- Circuit of outside unit is normal closed type.
Cover
Micro-switch
Adjustment screw
Vibration plate
Bellows
1 inch or
3/4 inch
socket
Pad
Picture 4
Picture 3
PIPE CONNECTIONS BETWEEN IN-
DOOR AND OUTSIDE UNIT

Refrigerant piping system

4 Outside Units
Example : 12 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe between Outside units : ARCNB41
Ⓕ : Connection branch pipe between Outside units : ARCNB31
Ⓖ : Connection branch pipe between Outside units : ARCNB21
Ⓗ : Header
Ⓘ : HR Unit
Slave 3
A4
Slave 2
A3
Slave 1
A2
Master
A1
G
F
E
A
1
D
a
D
2
b
B
C1
I1
c
H
D
3
"a"
d
C2
h
I2
D
4
f
e
D
6
5 D
- Case 1 ("a") : Maximum height is 15m if you install with Y branch.
- Case 2 ("b") : Maximum height is 5m in serial connection of HR units.
Conditional
To satisfy below condition to make 40 m ~ 90 m of pipe length after first
branch.
1) Diameter of pipes between first branch and the last branch should be in-
creased by one step, except pipe diameter B,C3 is same as Diameter A
Ø6.35 ' Ø 9.52 ' Ø 12.7 ' Ø 15.88 ' Ø 19.05 ' Ø 22.2 ' Ø 25.4*, Ø 28.58 '
Ø 31.8*, Ø 34.9 ' Ø 38.1*
* : It is not necessary to size up.
2) While calculating whole refrigerant pipe length, pipe B,C3 length should
be calculated twice.
A + B x 2 + C3 x 2 + C1 + C2 + a + b + c + d + e + f + g + i + j + k + l +
m + n ≤ 500 m
3) Length of pipe from each indoor unit to the HR Unit
(a,b,c,d,e,f,g,i,j,k,l,m,n) ≤ 40 m
4) [Length of pipe from outside unit to the farthest indoor unit D12
(A+B+C+D+e)]
- [Length of pipe outside unit to the closest indoor unit D1(C1+a)]
≤ 40 m
ODU Capacity
Master ≥ Slave1 ≥ Slave 2 ≥ Slave 3
B1
B2
C3
I3
g
i "b"
I4
D
7
k
j
H
sealing
x
8 D
l n
m
9 D 10 D 11 D 12
*
D