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[5-2 Outdoor Unit Control ]
5-2-5
Refrigerant Bypass Control
Bypass solenoid valves, which bypass the high- and low- pressure sides, perform the following functions.
(1) Bypass solenoid valve (SV1a) (ON = Open)
Operation
When starting-up the compressor of each
outdoor unit
After the restoration of thermo or 3 minutes
after restart
During cooling or heating operation with the
compressor stopped
After the operation has stopped
During defrost operation
While the compressor is operating at the
minimum frequency and when the low pres-
sure (63LS) drops (3 or more minutes after
compressor startup)
When high pressure (63HS1) rises
(2) Bypass solenoid valve (SV9) (ON = Open)
Operation
When high pressure (63HS1) rises during
the heating operation
Others
(3) Bypass solenoid valve (SV5b) (ON = Closed)
Operation
When high pressure (63HS1) rises during
the heating operation
At startup
During defrost cycle
When returning to normal operation after
completion of the defrost cycle
Others
HWE13080
ON
ON for 4 minutes.
ON for 4 minutes.
Exception: OFF when 63HS1-63LS is 0.2MPa[29psi] or less
ON for 3 minutes.
Exception: OFF when 63HS1-63LS is 0.2MPa[29psi] or less
When low pressure (63LS) drops
below 0.23MPa[33psi].
When 63HS1 exceeds
3.62MPa[525psi]
ON
When 63HS1 exceeds 3.50MPa
[507psi]
Always OFF
ON (Closed)
When the pressure is 2.70MPa
[391psi] or below
ON (Closed)
ON (Closed)
OFF (Open) for 3 minutes and goes ON (Closed)
Always ON (Closed)
- 125 -
SV1a
OFF
Always ON.
ON
When low pressure (63LS) ex-
ceeds 0.38MPa[55psi].
When 63HS1 is or below
3.43MPa[497psi] and 30 seconds
have passed
SV9
OFF
When SV5b is ON and the pressure
is 2.70MPa[391psi]or below
SV5b
OFF (Open)
When SV9 is ON and the pressure
is 3.50MPa [507psi] or more
GB
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Troubleshooting
Need help?
Do you have a question about the PURY-HP72 and is the answer not in the manual?
Questions and answers
what is the set up mode for recovery, and charging of sys?
Why can control my indoor unit with centralize control
You may not be able to control your Mitsubishi Electric PURY-HP72 indoor unit with centralized control for the following reasons:
1. The power jumper connector on the outdoor unit may not be correctly set. It should be connected to CN40 on only one outdoor unit.
2. The central control switch (SW5-1) on the control board of all outdoor units must be set to "ON."
3. Address settings may not be correctly configured. The main indoor unit should be assigned the smallest address (e.g., IC00), and correct port number settings are required.
4. If using a remote controller alone, an interlock setting from the remote controller is needed.
5. Both ME and MA remote controllers cannot be connected to the same indoor unit group.
6. System controller power issues may occur if the outdoor unit fan rotates due to external forces, causing the system controller to detect an error.
7. Improper wiring or incorrect voltage at TB7 may also prevent operation.
Check each of these conditions to ensure proper centralized control.
This answer is automatically generated
Why can’t control indoor unit with centralize control and stay the MA control set up can’t. Control the mode
The Mitsubishi Electric PURY-HP72 indoor unit cannot be controlled with centralized control and the mode control setup does not function due to the following reasons:
1. Central control is not possible if the indoor/outdoor transmission line is used, even if TB7 terminals are daisy-chained.
2. Shielded cables must be used, and the connection must only be made after confirming the voltage is below 20 VDC.
3. Improper connection of the transmission line for centralized control, such as not correctly daisy-chaining terminals M1 and M2 or not short-circuiting the earth and S terminals on TB7.
4. If a power supply unit is not connected to the centralized control line, the power jumper connector must be moved from CN41 to CN40 on one outdoor unit—if this is not done, mode control will not function.
5. Overlapped indoor unit addresses or noise interference on the remote controller lines can also prevent proper control.
6. Failure to set one MA remote controller to MAIN or exceeding its capacity can result in control failure.
All these factors must be correctly configured for centralized and mode control to function properly.
This answer is automatically generated