Toshiba MM-A0280HT Service Manual page 8

Outline of MMS (Modular Multi System)
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Branching
Combination of line and header branching is highly flexible. This allows
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for the shortest design route possible, thereby saving on installation
time and cost. Line/header branching after header branching is only
available with Toshiba's Multi Modular System.
Line Branching
Outdoor Unit
Branching joint
Indoor Unit
Header Branching
Outdoor Unit
Branching
Header
Indoor Unit
Line + Header Branching
Outdoor Unit
Branching joint
Indoor Unit
Line Branching after Header Branching
Outdoor Unit
Header
MMS
Only
Indoor Unit
Outdoor Unit
MMS
Only
Header
Indoor Unit
8F
Header
7F
Branching joint
2F
Header
1F
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Outline of MMS (Modular Multi System)
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Compact design
The design of the Toshiba MMS outdoor unit allows for easy unit
maneuvering into any standard lift. Its size also allows it to be easily
installed in limited spaces.
• Non-polarized control wiring between
outdoor and indoor units
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Largest system capacity
Outdoor unit
Toshiba's Multi Modular System can be combined up to 128.8kW
(46 HP).
Indoor unit
• Wiring diagnosis system
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Advanced bus communication system
[Example of wiring diagnosis]
Wiring between indoor and outdoor unit is a simple 2-wire system.
Communication address is also automatically configured.
Use the switches on the microcomputer
A default test mode operation is available.
PCB of the outdoor unit.
• Detects wiring to the indoor unit b4
which should not be in system A.
• b4 is missing in system B.
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Self diagnostic system
Comprehensive troubleshooting code enables quick identification of
Piping
problems arising.
System A Outdoor
unit
Wiring
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Indoor unit High lift design
Outdoor
System B
unit
Real pipe length of 100m (equivalent length 125m) and vertical lift of
50m is made possible with Toshiba's Multi Modular System.
Vertical lift between indoor units of 30m is the highest in the market.
This allows for greater flexibility in the location of the system.
Allowable pipe length :
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Multiple indoor units
100m real length
Outdoor (Equivalent to 125m)
Indoor units with different capacities and configurations can be
unit
combined up to 135% of the outdoor unit capacity.
A maximum of 40 indoor units can be combined with the 46 HP
1st branching
outdoor module.
section
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Intelligent control
Toshiba's MMS intelligent controls and modulating valves deliver the
required capacity, according to the load variation from 50% to 100%.
The intelligent controls and modulating valves limit or increase the
cooling/heating capacity dynamically so humidity and temperature
are kept in the comfort zone.
From 1st branching to the
farthest indoor unit: 50m
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