Specifications

Installation and operation manual
28
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
7 Earth wire (GRN/YLW)
8 Clamp the power supply to the plastic bracket using a field
supplied clamp to prevent external force being applied to
the terminal.
9 Clamp (field supplied)
10 Cup washer
11 When connecting the earth wire, it is recommended to
perform curling.
Connecting the power supply to multiple outdoor units
To connect the power supply for multiple outdoor units to each other,
ring tongues have to be used. No bare cable can be used.
The ring washer which is standard provided should be removed in
that case.
Attaching both cables to the power supply terminal should be done as
indicated.
13. Making field settings
To continue the configuration of the VRV IV replacement heat pump
system, it is required to give some input to the logic board of the unit.
This chapter will describe how manual input is possible by operating
the push buttons/DIP switches on the logic board and reading the
feedback from the 7 segment displays.
For VRV IV replacement heat pump system it is alternatively possible
to make several commissioning field settings through a personal
computer interface (for this, option EKPCCAB* is required). The
installer can prepare the configuration (off-site) on PC and afterwards
upload the configuration to the system. How to connect the cable is
described in "13.3. Connecting the PC configurator to the outdoor
unit" on page 30.
The contents of the actual settings is discussed and explained in
"15.2. Monitoring function and field settings" on page 37.
13.1. Accessing the push buttons on the logic board
It is not required to open the complete electronic component box to
access the push buttons on the logic board and read out the 7
segment display(s).
To access you can remove the front inspection cover of the front plate
(see figure). Now you can open the inspection cover of the electrical
component box front plate (see figure). You can see the three push
buttons and the three 7 segment displays and DIP switches.
1 Service cover
2 Main PCB with 3 seven segment display and 3 push
buttons
3 Electrical component box service cover
Operate the switches and push buttons with an insulated stick (such
as a closed ball-point pen) to avoid touching of live parts.
Make sure to re-attach the inspection cover into the electronic
component box cover and to close the front plate's inspection cover
after the job is finished. During operation of the unit the front plate of
the unit should be attached. Settings are still possible to be made
through the inspection opening.
INFORMATION
Installation and routing in case the cool/heat selector is
used: refer to installation manual of the cool/heat selector.
NOTICE
 When routing earth wires, secure clearance of 25 mm
or more away from compressor lead wires. Failure to
observe this instruction properly may adversely affect
correct operation of other units connected to the same
earth.
 When connecting the power supply, the earth
connection must be made before the current-carrying
connections are established. When disconnecting the
power supply, the current-carrying connections must
be separated before the earth connection is. The
length of the conductors between the power supply
stress relief and the terminal block itself must be as
such that the current-carrying wires are tautened
before the earth wire is in case the power supply is
pulled loose from the stress relief.
NOTICE
Precautions when laying power wiring:
 Do not connect wiring of different thicknesses 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
damage 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.
Tightening torque (N•m)
M8 (Power terminal block)
5.5~7.3
M8 (Ground)
M3 (Inter-unit wiring terminal block) 0.8~0.97
NOTICE
Recommendations when connecting the earth wire
Wire it so that it comes through the cut out section of the
cup washer. (An improper earth connection may prevent a
good earthing from being achieved.)
L1 L2 L2 N
2x
1
2
3