Toshiba A90-0132, Service Manual

Page: 11 / 176

11
Outline of MMS (Modular Multi System)
• Non-polarized control wiring between outdoor and
indoor units
Outdoor unit
Indoor unit
• Wiring diagnosis system
[Example of wiring diagnosis]
Use the switches on the microcomputer 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.
Outdoor
unit
Piping
Circuit A Outdoor
unit
Indoor unit
Piping
Circuit B
Outdoor unit
Allowable pipe length:
100 m real length
(Equivalent to 125 m)
Height difference between indoor
unit and outdoor unit: 50 m
Height difference between indoor
unit and outdoor unit: 30 m
From 1st branching to the
farthest indoor unit: 50 m
1st branching
section
•
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.
•
Largest system capacity
Toshiba’s Multi Modular System can be combined up to
128.8 kW (46 HP).
•
Advanced bus communication system
Wiring between indoor and outdoor unit is a simple 2-
wire system.
Communication address is also automatically configured.
A default test mode operation is available.
•
Self diagnostic system
Comprehensive troubleshooting code enables quick
identification of problems arising.
•
High lift design
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.
•
Multiple indoor units
Indoor units with different capacities and configurations
can be combined up to 135% of the outdoor unit capacity.
A maximum of 40 indoor units can be combined with the
46 HP outdoor module.
•
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.
3