10T7Y1B
VRV-W IV System Air Conditioner
4P347465-1A – 2013.04
Installation and operation manual
51
Hi-sensible
The refrigerant temperature is set higher (cooling) compared to
normal operation. The focus under high sensible mode is comfort
feeling for the customer.
The selection method of indoor units is important and has to be
considered as the available capacity is not the same as under normal
operation. For details concerning to Hi-sensible applications, please
contact your installer.
Available comfort settings
For each of above modes a comfort level can be selected. It is related
to the timing and the effort (energy consumption) which is put in
achieving a certain room temperature by temporarily changing the
refrigerant temperature to different values:
Powerful
Quick
Mild
Eco
8.
Maintenance
8.1.
Handling of heat source water
Requests from manufacturer
Do not fail to mount a strainer (sold separately as an accessory)
in the inlet pipe for heat source water intake.
Do not use any water contaminated by relatively high level of
foreign materials for heat source.
Carry out the control of water quality without fail.
Otherwise, corrosion of condenser or piping occurs or germs
may be generated.
For the timing of cleaning and its method, consult with the dealer
you purchased the unit.
Cleaning of the heat exchanger on the water side
Scale, moss, etc will accumulate on the heat exchanger on the
water side within an air conditioner when it is used for a long
time. Clean the heat exchanger at regular intervals. If scale,
moss, etc. has accumulated, the cooling and heating capacity
may decline. The safety device will be repeatedly actuated
causing normal operation to become impossible.
Increase the frequency of cleaning when the unit is used in an
area with poor water quality.
Cleaning of strainer
Clean the strainer in the inlet pipe of heat source water intake.
8.2.
Maintenance after a long stop period (e.g., at the
beginning of the season)
Check and remove everything that might be blocking inlet and
outlet vents of indoor units and outdoor units.
Run the pump and make sure that the water is circulating. If you
operate the pump without water circulating, the unit may be
damaged.
Clean air filters and casings of indoor units
(1)
. Refer to the
operation manual supplied with the indoor units for details on
how to proceed and make sure to install cleaned air filters back
in the same position.
Turn on the power at least 6 hours before operating the unit in
order to ensure smoother operation. As soon as the power is
turned on, the user interface display appears.
8.3.
Maintenance before a long stop period (e.g., at the
end of the season)
Let the indoor units run in fan only operation for about half a day
in order to dry the interior of the units. Refer to
"6.1. Cooling,
heating, fan only, and automatic operation" on page 48
for
details on fan only operation.
Turn off the power. The user interface display disappears.
Clean air filters and casings of indoor units
(1)
. Refer to the
operation manual supplied with the indoor units for details on
how to proceed and make sure to install cleaned air filters back
in the same position.
If the water piping can freeze, keep operating the heat source
water pump, even when the unit is not operating.
Remove all the water from the unit and the water piping if the
pump is not used for a long time in the winter.
9.
Symptoms that are not air conditioner
troubles
Following symptoms are not air conditioner troubles:
Symptom 1: The system does not operate
The air conditioner does not start immediately after the ON/OFF
button on the user interface is pressed. If the operation lamp
lights, the system is in normal condition. To prevent overloading
of the compressor motor, the air conditioner starts 5 minutes
after it is turned ON again in case it was turned OFF just before.
The same starting delay occurs after the operation mode
selector button was used.
If "Under Centralized Control" is displayed on the user interface,
pressing the operation button causes the display to blink for a
few seconds. The blinking display indicates that the user
interface cannot be used.
The system does not start immediately after the power supply is
turned on. Wait one minute until the micro computer is prepared
for operation.
Symptom 2: Cool/Heat cannot be changed over
When the display shows
(change-over under centralized
control), it shows that this is a slave user interface.
When the cool/heat changeover remote control switch is
installed and the display shows
(change-over under
centralized control), this is because cool/heat changeover is
controlled by the cool/ heat changeover remote control switch.
Ask your dealer where the remote control switch is installed.
Symptom 3: Fan operation is possible, but cooling and heating
do not work
Immediately after the power is turned on. The micro computer is
getting ready to operate and is performing a communication
check with all indoor units. Please wait 12 minutes (max.) till this
process is finished.
Only fan operation is possible. This is because the interlock
contact point is not turned ON. Check that the water pump is
operating. This is because the inlet water temperature of the
heat source water is beyond the operating conditions.
CAUTION
Pay attention to the fan.
It is dangerous to inspect the unit while the fan is running.
Be sure to turn off the main switch before executing any
maintenance task.
(1) Contact your installer or maintenance person to clean air filters
and casings of the indoor unit. Maintenance tips and
procedures for cleaning are provided in the installation/
operation manuals of dedicated indoor units.
4P347465-1A.book Page 51 Monday, August 5, 2013 2:26 PM
