Installing Bc Controller; Checking The Accessories With Bc Controller; Installing Bc Controllers; Connecting Refrigerant Pipes And Drain Pipes - Mitsubishi Electric CITY MULTI CMB-P-V-GA Manual De Instalación

E Less than H=50 m (when the outdoor unit is higher than the indoor unit)
F Less than H1=40 m (when the outdoor unit is lower than the indoor unit)
G Branch pipe (for Y Series) CMY-Y102S-G
H Combined pipe (CMY-R160-J: optional)
I Less than 110 m
K Up to three units for 1 branch hole
Total capacity: less than 140 (but same in cooling/heating mode)
L Less than h1=15 m (10 m or less for 125, 140 unit type)
M Less than h2=15 m
Item
A+B+a+b
Total piping length
Longest piping length
Between outdoor unit and BC
controller
Between indoor units and BC controller
Between
Above outdoor unit
indoor and
outdoor unit
Below outdoor unit
Between indoor units and BC controller
Between indoor units

3. Installing BC controller

3.1. Checking the accessories with BC con-
troller
The following items are supplied with each BC controller.
Item
1 Drain hose
2 Tie band
3
Hose band
4
Reducer (large & small)
5
Refrigerant connection pipe

4. Connecting refrigerant pipes and drain pipes

4.1. Connecting refrigerant pipes

1. Connect the liquid and gas pipes of each indoor unit to the same (correct) end
connection numbers as indicated on the indoor unit flare connection section of
each BC controller. If connected to wrong end connection numbers, there will
be no normal operation.
2. List indoor unit model names in the name plate on the BC controller control
box (for identification purposes), and BC controller end connection numbers
and address numbers in the name plate on the indoor unit side.
3. If the number of connected indoor units is less than the number of branch
holes, it does not matter which end connections you leave.
Seal unused end connections using flare nuts with end caps just as they were
capped when shipped from the factory. No end cap will lead to refrigerant leak-
age.
4. When using branch pipes (CMY-Y102S-G), be sure to connect them level.
5. Be sure to tighten the flare nuts using a double spanner. Otherwise the refrig-
erant may leak.
6. Be sure to use non-oxidative brazing where necessary. If you do not use non-
oxidative brazing, it may clog the pipes.
7. After completing pipe connection, support the pipes to ensure that load is not
imparted to the BC controller's end connections (particularly to the gas pipes
of indoor units).
6
J Less than 40 m
(Unit: m)
Piping portion Allowable value
Below 300*1
+c+d+e
A+e Below 150
A Below 110
e Below 40*2
H Below 50
H1 Below 40
Below 15
h1
(Below 10)*3
Below 15
h2
(Below 10)*3
Qty
1
1
1
Same number as
branch holes
2
Notes:
*1 Please refer to the figure "Allowable Pipe Length" below when the total
piping length exceeds 300 m.
*2 Please refer to the figure "Distance between BC controller and farthest
indoor unit" when the distance between BC controller and farthest in-
door unit exceeds 40 m.
*3 10 m or less, with indoor units with model numbers of 125, 140.
Allowable pipe length
400
350
300
250
200
30 40 50 60 70 80 90 100 110
Distance between outdoor
unit and BC controller (m)

3.2. Installing BC controllers

Installing hanging bolts
Install locally procured hanging bolts (all screws) following the procedure given in
the figure. The hanging bolt size is ø10 (M10 screw).
To hang the unit, use a lifting machine to lift and pass it through the hanging bolts.
[Fig. 3.2.1] (P.2)
1 Hanging method
A: Min.30 mm
A Hanging bolt ø10 (field supply)
C Washer (field supply)
E Anchor bolt M10 (field supply)
s Be sure to install the BC controllers level. Installing obliquely may cause
a risk of drain leakage. Use a level to check the unit's level. If it is oblique,
loosen the fixing nut and make an adjustment.
Caution:
Be sure to install the unit body level.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R410A) specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and result in severe damage.
Caution:
• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper alloy seamless
pipes and tubes". In addition, be sure that the inner and outer surfaces of
the pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shav-
ing particles, oils, moisture, or any other contaminant.
• Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and
the compressor may fail.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator
oil to coat flares and flange connections.
- The refrigerant used in the unit is highly hygroscopic and if it mixes with
water it will degrade the refrigerator oil.
Distance between BC contoroller
and farthest indoor unit
70
60
50
40
30
20
10
0
0 5 10 15
Height difference between
BC controller and farthest
indoor unit (m)
2 Installing-on-the-floor method
B Nut (field supply)
D Double nuts (field supply)