11
Refrigerant piping works
For installation of the refrigerant pipes, please refer to corresponding outdoor unit installation manual.
Since R410a has a high working pressure, only use the regulated refrigerant pipe and follow proper installation method.
Finish the gas pipe and the liquid pipe works with the insulation base. If the insulation work isn’t done properly,
condensation water may flow indoor and part of the ceiling can be damaged by heat.
In brazing the pipe, please follow the prescribed brazing method. (Please refer to outdoor unit installation manual)
Method
Branch with Y-joint
Using MCU
only
Using Y- joint
and MCU
Refrigerant pipe installation
Items
Examples
Remarks
Max.
piping
length
Outdoor ~
Outdoor unit
Piping
(Equivalent
piping)
200m below
(220m below)
Using MCU only
a+b+c+d+e+f+g
≤
200 m (220m)
Equivalent pipe
length.
Y joint : 0.5m,
Header : 1m,
MCU : 1m
Using Y-joint and MCU
a+g+m
≤
200 m (220 m)
Total
piping
1000m below
Using MCU only
a+b+c+d+e+f+g
≤
1000 m
Using Y-joint and MCU
a+b+c+d+e+f+g+p+h+i+j+k+m+n
≤
1000 m
Piping
10 m below r
≤
10, s
≤
10, t
≤
10 m
Equivalent
piping
13 m below
r
≤
13, s
≤
13, t
≤
13 m
Level
difference
Outdoor ~
Indoor unit
Piping
50 m / 40 m
*1)
H1
≤
50/40 m
Indoor ~
Indoor unit
Piping
15m below
H2
≤
15 m
Outdoor ~
Outdoor unit
Piping
5m below
H3
≤
5 m
MCU~MCU
Piping
15m below
H4
≤
15 m
Allowable
length
after
branch
The first branch ~
the farthest
Indoor unit
Piping
45 m below
Using MCU only
45 m
Using Y-joint and MCU
g+m
≤
45 m
*1) As an outdoor unit is located in a lower position than indoor unit, level difference is 40m.
MCU-Y6NEE_IM_E 33933A(1).indd 11
2011-06-28 오후 5:48:42
