Daikin R407C PLUS - Page 97

Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
86 Function R407C PLUS Series Heat Recovery System
Oil return control (heating, simultaneous cooling/heating operation) to prevent liquid back flow
"
2
Oil return operation ending conditions
(V0811)
2000pls only for sub unit side EV after 1
min of preparation
EV1, EV2 (main unit) = 0pls, EV3 (sub unit) = 2000pls
Control according to Tc
All indoor EV 1000pls (50 sec)→ 0pls (10 sec) → End of preparation operation to 4 way valve
changeover → 50pls (10 sec H 10)
PI control
[B]
[A]
[E]
INV
SVP
Outdoor EV
Indoor EV
(Heating unit)
Indoor EV
(Cooling unit)
Outdoor
fan
20S1
20RL
20RH
20RT
20S2
20S3
SVRVG
BS unit
solenoid
valve
52Hz+OFF
+(OFF)
Normal control
29Hz+OFF
+(OFF)
H 3
H 4
H 2
H 11
H 9
PI control
50 sec
SH control
Normal control
( H 10)
( H 10)
10 sec
500pls
200pls
Instruction
cancel
SC control
SH control
Instruction
cancel
200pls
500pls
H 8
1 min
Oil return
preparation flag
Oil return IN
BS unit
changeover
Oil return
OUT
1 min 10 sec
Discharge
Oil return
Suction
Accumulator
discharge operation
(5 min) 30 sec 10 sec 10 sec 40 sec 1 min 50 sec
Oil return, defrost
preparing signal output
OR
DSHi < 20˚C
10 continuous seconds
Th7 – Te < 15˚C
10 continuous seconds
5 minutes elapsed from suction oil return operation IN
&
OR
2 minutes elapsed from suction oil return operation IN
(V0811-1)