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System Control (Fig. 10-1) - Mitsubishi Electric PUHZ-RP HA5 Installation Manual

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9. Special Functions
9.3. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
1 Supply power (circuit breaker).
* When power is supplied, make sure that "CENTRALLY CONTROLLED" is not
displayed on the remote controller. If "CENTRALLY CONTROLLED" is dis-
played, the refrigerant collecting (pump down) cannot be completed normally.
2 After the gas stop valve is closed, set the SWP switch on the control board of the
outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor and
outdoor units) start operating and refrigerant collecting operation begins. LED1
and LED on the control board of the outdoor unit are lit.
* Only set the SWP switch (push-button type) to ON if the unit is stopped. How-
ever, even if the unit is stopped and the SWP switch is set to ON less than 3
minutes after the compressor stops, the refrigerant collecting operation can-
not be performed. Wait until compressor has been stopped for 3 minutes and
then set the SWP switch to ON again.
10. System control (Fig. 10-1)
E SW1
3 - 6
ON
OFF
3 4 5 6
ON
F SW1
3 - 6
OFF
3 4 5 6
G SW1
3 - 6
ON
OFF
3 4 5 6
A E
A
TB1
TB1
TB4
TB4
TB4
B
B
2
2
TB5
TB5
1
C
D
1
Fig. 10-1
14
A Outdoor unit
B Indoor unit
C Master remote controller
D Subordinate remote controller
E Standard 1:1 (Refrigerant address = 00)
F Simultaneous twin (Refrigerant address = 01)
G Simultaneous triple (Refrigerant address = 0)
F
A
G
TB1
TB4
TB4
TB4
B
B
B
B
TB5
3 Because the unit automatically stops in about  to 3 minutes after the refrigerant
collecting operation (LED1 and LED are lit), be sure to quickly close the gas
stop valve. When LED1 and LED are lit and the outdoor unit is stopped, open
the liquid stop valve completely, and then repeat step 2 after 3 minutes have
passed.
* If the refrigerant collecting operation has been completed normally (LED1 and
LED are lit), the unit will remain stopped until the power supply is turned off.
4 Turn off the power supply (circuit breaker).
* Note that when the length of the extension piping is long, it may not be pos-
sible to perform a pump-down operation. When performing the pump-down
operation, make sure that the low pressure is lowered to near 0 MPa (gauge).
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst if air etc. get into it.
* Set the refrigerant address using the DIP switch of the outdoor unit.
1 Wiring from the Remote Control
This wire is connected to TB5 (terminal board for remote controller) of the indoor
unit (non-polar).
2 When a Different Refrigerant System Grouping is Used.
Up to 16 refrigerant systems can be controlled as one group using the slim MA re-
mote controller.
Note:
In single refrigerant system (twin/triple), there is no need of wiring 2.
SW1
Function
Function table
1 Compulsory
<SW1>
defrosting
 Error history
ON
SW1
OFF
clear
function
3
Refrigerant
settings
4
system ad-
5
dress setting
6
Operation according to switch setting
ON
OFF
Start
Normal
Clear
Normal
Settings for outdoor unit addresses
0 to 15

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