Mitsubishi CityMulti Catalog - Salvex

Advantages of CITY MULTI two-pipe systems
The advantages of the two-pipe CITY MULTI system become very obvious when it comes to installation. The illustration s
below compare the minimum number of connections required for simultaneous cooling and heating system with four indoor
units. The CITY MULTI system requires only 20 connections versus 58 for a three-pipe system. As the number of indoor units
grow, so do the two-pipe installations savings, in terms of connections (refrigerant and electrical) as well as maintenance access.
CITY MULTI
Two-Pipe Heat
Recovery System
Outdoor Unit
BC Controller
Outdoor Unit
OUTDOOR UNITS
Indoor Units
Refrigerant
Distribution
Units
OTHER MANUFACTURERS SYSTEM
BC Controller
The BC Controller is the technological heart of the CITY MULTI
R2-/WR2-Series. It works in unison with the outdoor unit to
provide simultaneous cooling and heating, something no other
two-pipe system can do.
The Single BC Controller is
connected to the outdoor unit
by two refrigerant pipes, and
to each indoor unit by a series
of two pipes, depending on
BC Controller
the indoor unit count.
The Main BC Controller and up
to two optional Sub BC Controllers connect the outdoor
unit to the system’s indoor units. A Single or Main BC Controller
is required for each CITY MULTI R2-/WR2-Series installation.
The BC Controller model and size selected depends on how
many indoor units will be operated from each outdoor unit,
your total capacity requirements, and your installation needs.
Each set of ports supports up to 54,000 Btu/h of capacity.
• Single BC Controller:
Used when only one BC controller is required. For systems
with up to 120,000 Btu/h nominal cooling capacity.
• Main BC Controller:
For systems with up to 288,000 Btu/h nominal cooling
capacity and when use of Sub BC Controllers is desired.
• Sub BC Controller:
Used with a Main BC controller to connect additional
indoor units. A maximum of two Sub BC Controllers can
be connected to one Main BC Controller per system.
Increased pipe length
The R2-Series system offers flexibility and reduced costs
for refrigerant piping. The system may have a maximum total
length of refrigerant piping from 1,804 to 2,624 feet one way,
depending on outdoor unit model.
Refrigerant piping lengths
Maximum feet
Total length ..........................................................1,804 - 2,624
- Maximum total length is dependent on the outdoor
unit model and distance between BC controller.
Farthest Indoor from Outdoor ............................541 (623 equivalent)
Maximum length between outdoor
and single/main BC controller ............................360
Maximum length between single/main
BC controller and indoor ...................................131-196
Vertical differentials between units
Indoor/outdoor (outdoor higher) .........................164*
Indoor/outdoor (outdoor lower) ..........................131
Indoor/BC controller (single/main) ......................49
- Maximum length between single/main BC controller and
indoor is dependent upon the vertical differential between
the single/main BC controller and the indoor unit.
Indoor/indoor .......................................................49
Controller/Sub BC Controller ..............................49
Maximum feet
*Can be extended. Ask your local Mitsubishi Electric representative for more details.
17
17