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)
Summary of Contents for R407C PLUS
Page 1: ...System R407C PLUS Series Heat Recovery System Si33 105 Service Manual ...
Page 11: ...Introduction Si33 105 x ...
Page 41: ...Specifications Si33 105 30 Specifications R407C PLUS Series Heat Recovery System ...
Page 147: ...Test Operation Si33 105 136 Test Operation R407C PLUS Series Heat Recovery System ...
Page 263: ...Si33 105 iv Index ...
