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English
Indoor Unit Installation (1)
7.
Purging air
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Purging air
• Air pockets sometimes form in the piping during trial operation
after construction work and during normal operation. To
remove air pockets from inside the piping, follow the steps
below to purge air from the unit. Be sure to purge air while the
unit is in cooling or heating operation.
1) Remove the front panel and the air filter.
2) While pressing on the air purge valve with one hand, turn the
air purge valve knob with your other hand as shown.
3) Open the valve, make sure that air has been completely
purged, and then close the valve securely.
CAUTION
• There is a risk of injury if you touch the heat exchanger with your bare hand.
• Be sure to close the air purge valve after purging air.
Leaving the air purge valve open may result in water leakage and decreased performance.
• Before starting trial operation of the system, always check that the valve is closed.
• Water leakage will result if the knob of the air purge valve is loose. Check that the knob is tightly closed.
8.
DIP switch settings based on installation site conditions
Set DIP switch SW2-1 to heating/cooling use or heating only use based on the specifications of the outdoor unit.
If the unit is being connected to “HPSU” and the * part (see the example model) of the model number on the hydro box is “BA”
or later, set DIP switch SW2-2 to “ON”.
Valve open
Knob
Air purge valve
Heating/cooling use or heating
only use selector DIP switch
Switch number
SW2-1
OFF (heating/cooling use)
Set function
Use
Factory setting
Set the DIP switch for heating/cooling use
or heating only use.
Select heating/cooling use or heating
only use.
ON
OFF
ON (heating only use)
OFF (heating/cooling use)
• How to set and use the switch
DIP switch for control of the
interlink to “HPSU”
Switch number
SW2-2
OFF (Other)
Set function
Use
Factory setting
Controls interlink to “HPSU”
Connecting to a hydro box whose
* part of the model number is “BA” or later
ON
OFF
ON (Connect to a hydro box whose
* part of the model number is “BA” or later.)
OFF (Other)
• How to set and use the switch
Example model: RKHBX008BA3V3
*
