Toshiba MMY-MUP0721FT6P-UL Service Manual page 114

Operations (contents of control)
(1) Defrosting conditions for system cooperation defrosting (hereinafter referred to as "cooperation defrosting
conditions") are measured at each system, separately from normal defrosting conditions.
When multiple systems satisfy the cooperation defrosting conditions at the same time, the system that has
satisfied the conditions earlier starts defrosting.
(2) When a system that has started defrosting earlier is still defrosting, other systems do not perform defrosting
but continue heating operations.
(3) When defrosting of the system that started defrosting earlier ends, the system that has satisfied the
cooperation defrosting conditions next starts defrosting.
(4) When only one system satisfies the cooperation defrosting conditions, that system continues heating
operations, and performs defrosting at the point that normal defrosting conditions are satisfied.
(5) A system that has satisfied normal defrosting conditions starts defrosting to avoid the risk of remaining
frost, even if system cooperation defrosting is being performed.
<Operation examples of system cooperation defrosting>
(Example 1) 2-system cooperation defrosting
In a case where cooperation defrosting conditions are satisfied in the order of system II and
system I, defrosting is performed in the order of system II and system I.
System I
System II
*1 Continue heating without starting defrosting control while system II is defrosting
*2 Start defrosting after system II ends defrosting
(Example 2) 3-system cooperation defrosting
In a case where cooperation defrosting conditions are satisfied in the order of system II, system I
and system III, defrosting is performed in the order satisfying conditions among the three systems.
System I
System II
System III
*1 Continue heating without starting defrosting control while system II is defrosting
*2 Start defrosting after system II ends defrosting
*3 Start defrosting after system I ends defrosting.
(Example 3) 2-system cooperation defrosting out of three systems
In a case where cooperation defrosting conditions are satisfied in the order of system II and
system III, but system I does not satisfy conditions, system cooperation defrosting is performed by
system II and system III alone.
System I
System II
System III
*1 During system II defrosting, don't start defrosting control but continue heating.
*2 The system II is a defrosting start after the end of defrosting
<Examples of not performing system cooperation defrosting>
(Example 4) Normal defrosting
In a case in where only system II satisfies defrosting conditions (system cooperation defrosting
conditions and normal defrosting conditions), only system II performs defrosting.
System I
System II
System III
System I
System II
System III
(Example 5) Example of not performing system cooperation defrosting
In a case where normal defrosting conditions are satisfied due to sudden increase in frost or the
like, defrosting is started to avoid the risk of remaining frost, even if other systems are performing
system cooperation defrosting.
System I
System II
*1 State where heating operations are continuing while system II is performing cooperation
defrosting
*2 If normal defrosting conditions are satisfied, defrosting is started without awaiting system II to
end defrosting.
→ →
Heating Heating *1
→ → Defrosting
Heating
→ →
Heating Heating *1
→ →
Heating Defrosting
→ → →
Heating Heating *1
→ →
Heating Heating
→ → Defrosting
Heating
→ Heating *1 →
Heating
→
Heating Heating
→ Defrosting
Heating
→
Heating Heating
→
Stop Stop
→ Defrosting
Heating
→
Stop Stop
→
Heating Heating *1
→
Heating Defrosting
→ →
Defrosting *2 Heating
→ →
Heating Heating
→ → →
Defrosting *2 Heating
→
→ →
Heating Heating
→ → → →
Heating *1 Defrosting *3
→ →
Heating Heating
→ →
Heating Heating
→ →
Defrosting *2 Heating
→
Heating
→
Heating
→
Heating
→
Stop
→
Heating
→
Stop
→
Defrosting *2
→
Heating
- 114 -
→
Heating
→
Heating
→
Heating
→
Heating
→
Heating