Other Function; Auto-Changeover Function (Automatic Changeover Of Cooling/Heating Operation) - Mitsubishi Electric G-50A Technical Manual

16. Other function

16.1 Auto-Changeover Function (Automatic
Changeover of Cooling/Heating Operation)
For the outdoor unit (Y Series) without the function of cooling/heating simultaneous operation, G-50A can
judge whether cooling or heating should be selected by observing a difference between the set and inlet
temperature of each indoor unit, and collectively changes over the operation of cooling/heating of indoor units
connected to the outdoor unit.
With this function employed, cooling operation is automatically selected if your room is getting hot, while
heating operation is automatically switched over if your room is getting cold. The troublesome work to change
over the operation mode by operating the remote controller of all indoor units, as was required in the past,
can be eliminated.
- Automatic cooling/heating
- changeover mode
- Typical group mode
(In a unit of mode
Integrated software
changeover block)
(TG-2000A)
The operation mode is changed over
for each changeover block collectively.
The auto-changeover function includes two switching modes, [Auto-changeover mode] and [Typical air
conditioning group assigning mode]. Either mode can be set from the integrated software (TG-2000A) in a
unit of the changeover block*.
* Changeover block : This represents a block in the unit of refrigerant system. When an operation group
Changeover mode
Automatic changeover mode
Typical air conditioning group
assigning mode
Status judgment
(for every 15 minutes)
G-50A
Figure 16-1 Configuration of auto-changeover system
over refrigerant systems is set, the plural refrigerant systems for which the group
belongs to will form a same changeover block.
Table 16-1 Operation detail of each changeover mode
The difference between the inlet temperature and set temperature of each air conditioning group
is checked once for 15 minutes, and the operation mode (cooling/heating) with higher priority is
changed over to operate by considering the air conditioning capacity ratio.
When a typical group is assigned, the difference between the inlet and set temperature of the
assigned group is checked once for 15 minutes, and the mode is changed over for operation.
In the case of the typical group under stopping or fan operation, automatic control takes place
with [auto-changeover mode] automatically.
Changeover block 1
Group 1
Outdoor unit
Group 4
Changeover block 2
Group 5
Operation detail
Group 2 Group 3
Indoor unit
Group 6
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