Si33-105 Outline of Control (Outdoor Unit) < Symbols using in this manual >
Function R407C PLUS Series Heat Recovery System 93
"
3
Accumulator discharge operation ending conditions
"
4
LPSH control by outdoor unit EV
PI control activated when SHS = 10
(initial opening degree: 200 pls
In the case of an LP retry, the next PI control is provided at SHS = 5.
When condition
"
3 is met, the next startup condition is reset to SHS = 10.)
"
5
When returning to normal outdoor EV control, the PI control is provided at that opening degree.
"
7
When Pc>1.86MPa during defrosting operation, repeat the following functions in the elapsed
time of 1 minute and 30 seconds after the last STD compressor turns on until HP defrost-out
condition is met.
HP>1.47MPa
→
Outdoor fan step 5
HP<1.18MPa
→
Outdoor fan step 0
(Thereafter, follow the normal defrost-out condition in outdoor fan step 0)
"
8
Opens receiver solenoid valve SVRVG for 60 seconds at 1 minute after the preparation mode is
activated.
However, the valve is closed when Th7 - Te < 0.
"
9
The upper limit frequency is restricted to 67Hz+OFF(+OFF) during accumulator discharge
operation.
"
10
Operates with 50pls after 10 seconds elapsed until LP<0.3MPa, thereafter, operate with the
opening according to
"
6. (However, also cancelled with defrost ending.)
[Defrosting operation ending conditions]
When the following conditions are met, the defrosting operation ends.
However, when the compressor stops during a defrosting operation, if condition (Tb > 12.5°C) is
not met at the next compressor startup, the defrosting operation starts and a 10-minute counter
is activated when the soft startup is completed.
&
OR
When distributor pipe temperatures at all heat exchanger outlets (during cooling
operation) are as follows: Tb>12.5°C
Pc>2.16MPa
When defrost operation is conducted for 10 minutes.
All compressor are ON
OR
OR
&
DSHi>30
Th7 – Te>10
LP<0.1MPa
1 minute or more after
completion of defrosting
operation
Elapsed time of 10 minutes
Pc>1.96MPa
(V0807-1)
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