System Control (Fig. 9-1); Low Ambient Cooling - Mitsubishi Electric PUZ-A12 NHA7 Manuel D'installation

9. System control (Fig. 9-1)

E SW 1 - 3 ~ 6
ON
OFF
3 4 5
ON
F SW 1 - 3 ~ 6
OFF
3 4 5
G SW 1 - 3 ~ 6
ON
OFF
3 4 5
A E A F
TB1 TB1
TB4 TB4 TB4
B B
2
2
TB5 TB5
1
C D 1
Fig. 9-1

10. Low ambient cooling

Precautions for low ambient cooling
• If the outdoor temperature is 23 °F or lower during cooling operation, install an optional air guide to prevent wind from blowing into the outdoor unit.
• Install the outdoor unit in a location where wind will not blow onto the back of the unit.
• To prevent damage to the parts, be sure to install the unit, turn on the main power, and perform service in an environment where the ambient temperature is 0 °F or higher.
• In order to protect the compressor and electrical components, do not turn off the circuit breaker if the unit is installed in an environment where the ambient temperature is 0
°F or lower.
• It needs at least 12hr standby to operation in order to warm the electrical parts.
A Outdoor unit
B Indoor unit
C Master remote controller
6
D Subordinate remote controller
E Standard 1:1 (Refrigerant address = 00)
F Simultaneous twin (Refrigerant address = 01)
G Simultaneous twin (Refrigerant address = 02)
6
6
A G
TB1
TB4 TB4
B B B
TB5
• 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
remote controller.
Note:
In single refrigerant system (twin), there is no need of wiring 2 .
SW1
Function
Function table
1 Compulsory
<SW1>
defrosting
2 Error history
ON
SW1
clear
OFF
function
3 Refrigerant
1 2 3 4 5 6
settings
4 system
5 dress setting
6
Operation according to switch setting
ON OFF
Start Normal
Clear Normal
Settings for outdoor unit addresses
ad- 0 to 15
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