- 149 -
[
VII
Control ]
-4- Bypass Control <PURY>
Bypass solenoid valves (P72-P144,SV1, SV2; P168-P234,SV1, SV2, SV3), which bypass the high- and low- pressure
sides, perform the following functions.
(1) Bypass solenoid valve (SV1) (ON = Open)
[Example of an SV1 operation]
(2) Bypass solenoid valve (SV2) (ON = Open)
(3) Bypass valve (SV3, P168-P234 models only) (ON = Open)
The opening of SV3 depends on the operating state of No.1 and No.2 compressors.
Operation
SV1
ON OFF
At No. 1 compressor start-up or at No. 2
compressor start-up
(P168-P234 models only)
ON for 4 minutes.
After going from Thermo-OFF condition to
Thermo-ON condition or after 3-minutes re-
start prevention
ON for 2 minutes.
During cooling or heating operation with the
compressor stopped
Always ON.
Exception: OFF when HPS-LPS is 0.2 MPa [29 psi] or less
After the operation has stopped
ON for 3 minutes.
Exception: OFF when HPS-LPS is 0.2 MPa [29 psi] or less
During defrost operation
(See *1 in the figure below.)
Always ON
During oil-recovery operation
Always OFF during cooling operation and always ON during heating op-
eration when running an oil-recovery operation after running a continuous
operation at low frequency.
During an operation with the compressor
running at 30 Hz (After 3 minutes have
passed since start-up)
When low pressure (LPS) drops
below 0.23 MPa [33 psi].
When low pressure (LPS) exceeds
0.38 MPa [55 psi].
When high pressure (Pd) rises
When Pd exceeds
3.77 MPa [547 psi]
When Pd is or below
3.43 MPa [497 psi] and 30 seconds
have passed
Operation
SV2
ON
OFF
When low pressure (LPS) drops in
heating-only mode or heating-main mode
(after 5 minutes since the compressor
start-up)
When low pressure (LPS) drops
below 0.25 MPa [36 psi].
When low pressure (LPS) exceeds
0.39 MPa [57 psi].
No.1 Compressor
No.2 Compressor
SV3
Stopped
Stopped
OFF
In operation
Stopped
ON
In operation
In operation
OFF
Start-
up
Thermo.
Thermo.
Defrost
time
(*1)
Stopped
OFF
ON
Compressor
Bypass solenoid
valve (SV1)
(4-min.)
(2-min.)
(8-min.)
(3-min.
)
Содержание PUHY-P168
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Страница 134: ... 125 VI Refrigerant Circuit 3 CMB P104 and P108NU GB sub TH25 TH22 LEV3a CP Solenoid valves Block Check valves Block ...
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