3
1
10
• VRV Systems • Outdoor Units
99
• Outdoor Units • HEAT PUMP • RWEYQ-MY1
10
Installation of outdoor units
10 - 8 Field wiring
10 - 8 - 4
Examples
C
AUTION
<Precautions when laying power wiring>
Use crimp-style terminals for connections to the power terminal block.
When none are available, follow the instructions below.
•
Do not connect wiring of different size to the power terminal block. (Slack in the power wiring may cause abnormal heat.)
•
When connecting wiring which is the same thickness, do as shown in the figure below.
•
For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure being exerted on the terminal board.
•
Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small head will strip the head and make proper
tightening impossible.
•
Over-tightening the terminal screws may break them.
•
See the table below for tightening torque for the terminal screws.
<Precautions when connecting the ground>
When pulling the ground wire out, wire it so that it comes through the cut out section of the cup washer. (An improper ground connection may
prevent a good ground from being achieved.)
10 - 8 - 5
In case of a local setting
If necessary, do the local settings as mentioned in the table below.
For setting, refer to the plate “Cares to be taken in servicing” attached to the cover of electrical box.
Typical local settings
*For other settings than mentioned in the table below, refer to the equipment design materials and service manual.
C
AUTION
A separate adapter (sold separately as an accessory) for external control of an outside unit becomes necessary when doing a demand operation
from an external instruction, setting of cooling and heating through a centralized remote controller for cooling and heating (sold separately as an
accessory) and setting of centralized interlock.
For details, refer to the pamphlet attached to the adapter.
Tightening torque (N · m)
M5 (Power terminal block)
3.0 - 4.1
M5 (Ground)
M3 (transmission wiring terminal block)
0.8 - 0.97
(1) Setting of switching between cooling and heating
This setting is done when switching between cooling and heating is performed by a switching remote controller (sold
separately as an accessory) installed on the outside unit.
(2) Setting to prohibit sequenced start
This setting is done when the outside units are not started in a sequenced order.
(3) Setting of centralized interlock Setting of external
demand
These settings are done when the interlocks are connected in a lump-sum manner or when performing a demand
operation by external instruction.
(4) Setting of abnormal display when interlock contact is
OFF
This setting is done when making an abnormal display (HJ) on a remote controller when the interlock contact is OFF (when
the heat source water pump is not operated)
Power wire
Crimp-style terminal
Connect same-
size wiring to
both sides.
It is forbidden to
connect two to
one side.
It is forbidden to
connect wiring of
different size.
Crimp-style terminal
Cup washer
Cut out section
