Toshiba HWT-601XWHM3W-ETR - Page 94

93
7-4.
Outdoor unit
control
9) High pressure release control
1) To prevent excessive high pressure rise, operating frequency is controlled by the PD sensor.
2) If the PD sensor detects an abnormal stop zone pressure, the compressor stops and the abnormality detection
counter increments.
3) When the compressor stops in 2), the heat-pump operation restarts when the pressure decrease to zone "e" (normal
operation) after 150 seconds passed.
4) When the compressor stops in 2), the abnormality detection counter is cleared when the operation continues for 10
minutes. If the counter counts 10 times, error code is displayed on the remote-controller and the compressor does
not restart.
5) For details about an check code displayed, see the check code list. (See page 98)
10) High pressure switch
The high pressure switch detects abnormal high pressure (higher than 4.15 MPa (4.60 MPa)*) in refrigeration cycle
and protect the compressor.
* ( ): 801, 1101
• The high pressure switch stops the compressor as the pressure in the refrigeration cycle becomes higher than
above value.
• The compressor will restart three minutes after stopping.
• If the high pressure switch functions again after restarting, the compressor stops and the “P04” error code is
indicated.
11) Compressor case thermostat
The compressor case thermostat functions to protect the compressor when the blow-out temperature from the
compressor is too high.
• The compressor case thermostat on the upper part of compressor stops the compressor.
• The compressor will restart three minutes after stopping.
• If the compressor case thermostat functions again after restarting (functions at 125°C), compressor stops and the
“H04” error code is indicated.
12) Bottom plate heater control
Control ON and OFF of the bottom plate heater using the outdoor temperature sensor (TO).
Item Operation flow and applicable data, etc.
Normal operation
801, 1101 401, 601*
* Use the temperature sensor for
determination the zone.
Heating TC
(TWO + 2)
Cooling TL
a64 61
b62 58
c60 58
d58 56
e54 54
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
0 102030405060708090
PD sensor [MPa]PD sensor [MPa]
Compressor frequency [Hz]Compressor frequency [Hz]
a
b, c
d
e
+2
TO
0
Bottom plate
heater is turned on
Bottom plate
heater is turned off