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18 Configuration
17.6
To connect the cool/heat selector
switch option
In order to control the cooling or heating operation from a central
location,
the
following
optional
(KRC19-26A) can be connected:
1 Connect the cool/heat selector switch to terminal X1M of the
cool/heat selector PCB.
1
A
X1M
KRC19-26A
2
B
3
C
X1M
Terminal on the PCB
KRC19-26A
Cool/heat selector switch
2 Route the wires in the switchbox as shown:
8 HP
A6P
a
b
b
3 Turn ON the DIP switch (DS1‑1). See
components" [ 4 41] for more information on the DIP switch.
ON
OFF
1
2
3
4
DS1
DIP switch 1
17.7
To check the insulation resistance
of the compressor
NOTICE
If, after installation, refrigerant accumulates in the
compressor, the insulation resistance over the poles can
drop, but if it is at least 1 MΩ, then the unit will not break
down.
▪ Use a 500 V mega-tester when measuring insulation.
▪ Do NOT use a mega-tester for low voltage circuits.
1 Measure the insulation resistance over the poles.
If
≥1 MΩ
Insulation resistance is OK. This procedure is
finished.
<1 MΩ
Insulation resistance is not OK. Go to the next step.
2 Turn ON the power and leave it on for 6 hours.
Installation and operation manual
40
cool/heat
selector
switch
10-12 HP
A6P
a
b
"18.1.2 Field setting
Then
Result: The compressor will heat up and evaporate any
refrigerant in the compressor.
3 Measure the insulation resistance again.
18
Configuration
DANGER: RISK OF ELECTROCUTION
INFORMATION
It is important that all information in this chapter is read
sequentially by the installer and that the system is
configured as applicable.
18.1
Making field settings
18.1.1
About making field settings
To continue the configuration of the VRV 5-S heat pump system, it is
required to give some input to the PCB of the unit. This chapter will
describe how manual input is possible by operating the push buttons
on the PCB and reading the feedback from the 7‑segment displays.
Next to making field settings it is also possible to confirm the current
operation parameters of the unit.
Push buttons and DIP switches
Item
Push buttons
By operating the push buttons it is possible to:
▪ Perform special actions (refrigerant charge,
testrun, etc).
▪ Perform field settings (demand operation,
low noise, etc).
DIP switches
By operating the DIP switches it is possible to:
▪ DS1 (1): COOL/HEAT selector (refer to the
manual of the cool/heat selector switch).
OFF=not installed=factory setting
▪ DS1 (2~4): NOT USED. DO NOT CHANGE
THE FACTORY SETTING.
▪ DS2 (1~4): NOT USED. DO NOT CHANGE
THE FACTORY SETTING.
See also:
components" [ 4 41]
▪
"18.1.2 Field setting
Mode 1 and 2
Mode
Mode 1
Mode 1 can be used to monitor the current
situation of the outdoor unit. Some field setting
(monitoring
contents can be monitored as well.
settings)
Mode 2
Mode 2 is used to change the field settings of
the system. Consulting the current field setting
(field settings)
value and changing the current field setting
value is possible.
In general, normal operation can be resumed
without special intervention after changing field
settings.
Some field settings are used for special
operation (e.g., one time operation, recovery/
vacuuming setting, manual adding refrigerant
setting, etc.). In such a case, it is required to
abort the special operation before normal
operation can restart. It will be indicated in
below explanations.
Description
Description
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
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Troubleshooting
