Radiant Operation - Daikin K-Series Service Manual

Part4.fm Page 19 Tuesday, April 26, 2011 10:22 AM
SiBE061121
1.5

RADIANT Operation

The RADIANT operation has 2 operation modes.
1.5.1 Indoor Electronic Expansion Valve (Motor Operated Valve) Control
Initializing with The indoor electronic expansion valve is initialized when turning on the power.
Power ON
Opening Limit Opening limit control limits the opening of the indoor electronic expansion valve in order to keep
a specified range during RADIANT operation.
Control
Starting Starting operation control opens the indoor electronic expansion valve to a certain degree when
Operation starting RADIANT operation. The indoor electronic expansion valve is kept open for a certain
period.
Control
Target Panel When the starting operation control finishes, the target panel temperature control starts and
Temperature adjusts the opening of the indoor electronic expansion valve to achieve the target panel
temperature. The panel temperature is categorized into stop, dropping, keep, up, and return
Control
zones.
(The target panel temperature is 55°C at maximum but it may be lower depending on the
condition.)
Stop zone
Dropping zone
Keep zone
Up zone
Return zone
Operation Stop
Control In case any of the following events occur while the indoor electronic expansion valve is open,
the operation stop control makes the indoor electronic expansion valve close completely.
Function and Control
RADIANT 1: RADIANT operation with heating
RADIANT 2: RADIANT operation only
Radiant panel temperature
Stop zone
70˚C
Dropping zone
55˚C
Keep zone
53˚C
Up zone
51˚C
45˚C
Up zone / return zone from stop
Operation stops, the radiant panel temperature control is carried out.
The opening of indoor electronic expansion valve decreases.
The opening of indoor electronic expansion valve is kept.
The opening of indoor electronic expansion valve increases.
Starting operation control is carried out.
In case operation stops during RADIANT operation (including thermostat off)
Operation ON → OFF
RADIANT 1 or RADIANT 2 is canceled.
Thermostat off
Defrost control
Main Functions
(R14636)
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