Cooling Operation - Toshiba ESTIA RUA-CP1701H Service Manual

Monobloc Outdoor Unit
•
The operation of the heating mode is determined by the temperature sensor located inside the remote
controller
•
The heating operation will start when:
[1] Room Air Temperature < Air Set point [P421] – Air Delta Set point [P428]
•
The heating operation will continue until:
[2] Room Air Temperature > Air Set point [P421] + Air Delta Set point [P428]
OR
[3] Room Air Temperature > Air Set point [P421] AND current capacity is less than 10%
Related Parameters for Room Air Temperature Control:
Par.No
421 Heat home set point – (hwoccstp): [°C]
422 Heat home offset – (hwunooff): [K]
423 Heat away offset – (hwecooff): [K]
428 Air delta set point – (deltastp)
521 User interface type – (ui-type)

8.2.4. Cooling Operation

• Cooling control using water temperature:
The cooling operation is controlled by the system Control Temperature (CTRL_TMP) and the system Control Point
(CTRL_PNT). The Control Temperature is measured by the leaving water temperature sensor (LWT) [P004].
To prevent the system short cycling, in cooling mode, the Water Cool Hysteresis [P411 parameter must be set.
The Control Point (CTRL_PNT) has to be set for each of the occupancy modes. This is achieved by applying an
offset to the Control Point (CTRL_PNT) set for the "HOME" mode. The offsets are applied by setting parameters
[P408 – Cool Sleep Offset] and [P409 – Cool Away Offset].
It is possible to select either water temperature or room air temperature controller using the same remote controller.
This is achieved by setting the User Interface Type [P521]
Control Point
Control Temperature (CTRL_TMP) = leaving water temperature (LWT) [P004]
Control Point (CTRL_PNT) = set point temperature
Water Cool Hysteresis = [P411]
LWT
(+) Cool Hysteresis
CTRL_PNT
(-) Cool Hysteresis
ON
Cooling Operation
OFF
Description
Remote Inputs
[P521 = 1]
Leaving water temperature
[1] [2]
Range
12.0 ~ 34.0
-10.0 ~ 0.0
-10.0 ~ 0.0
0.2 ~ 1.0
0~3
Remote Controller (Air)
[P521 = 2]
Room air temperature
[1]
37
Service Manual
Default
19.0
-2.0
-4.0
0.5
0
Remote Controller (water)
[P521 = 3]
Leaving water temperature
[3]