Panasonic CS-E18SD3UAW service manual - Page 58

Protection Control for Heating Operation

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13.3 Protection Control for Heating Operation 13.3.1 Intake Air Temperature Control Compressor will operate at maximum frequency if below conditions occur: 1 When the indoor intake air temperature is 86°F or above. 13.3.2 Outdoor Air Temperature Control The maximum current value is regulated when the outdoor air temperature rises above 57.2°F in order to avoid compressor overloading. 13.3.3 Overload Protection Control The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures. If the heat exchanger temperature exceeds 140°F, compressor will stop. 140ºF 131ºF 120.2ºF OFF Frequency Reduced Frequency Limited Free 114.8ºF 13.3.4 Cold Draught Operation When indoor pipe temperature is low, cold draught operation start where indoor fan speed will be reduced. 13.3.5 Deice Operation When outdoor pipe temperature and outdoor temperature is low, deice operation start where indoor fan motor and outdoor fan motor stop and operation LED blinks. 13.3.6 Drain Pump Control  This unit has built-in with drain pump. Control content  During COOL/DRY mode. o During COOL/DRY mode, drain pump starts 10 seconds after indoor fan motor starts. o The drain pump turns ON and turns OFF periodically. (ON or OFF duration depends on room temperature).  After COOL/DRY mode, when unit turns OFF (power standby) or changes to HEAT mode. o The drain pump turns ON for 60 seconds immediately.  Error judgment o When float switch detects ON signal continuously for 2 minutes 30 seconds, error code H21 are shown. o When float switch ON has operated 2 times within 20 minutes, error code H35 are shown. 58

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58
13.3 Protection Control for Heating Operation
13.3.1
Intake Air Temperature Control
Compressor will operate at maximum frequency if below conditions occur:
1
When the indoor intake air temperature is 86°F or above.
13.3.2
Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 57.2°F in order to avoid
compressor overloading.
13.3.3
Overload Protection Control
The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in
below figures.
If the heat exchanger temperature exceeds 140°F, compressor will stop.
114.8ºF
120.2ºF
131ºF
140ºF
OFF
Free
Frequency Limited
Frequency Reduced
13.3.4
Cold Draught Operation
When indoor pipe temperature is low, cold draught operation start where indoor fan speed will be reduced.
13.3.5
Deice Operation
When outdoor pipe temperature and outdoor temperature is low, deice operation start where indoor fan motor and
outdoor fan motor stop and operation LED blinks.
13.3.6
Drain Pump Control
This unit has built-in with drain pump.
Control content
During COOL/DRY mode.
o
During COOL/DRY mode, drain pump starts 10 seconds after indoor fan motor starts.
o
The drain pump turns ON and turns OFF periodically. (ON or OFF duration depends on room temperature).
After COOL/DRY mode, when unit turns OFF (power standby) or changes to HEAT mode.
o
The drain pump turns ON for 60 seconds immediately.
Error judgment
o
When float switch detects ON signal continuously for 2 minutes 30 seconds, error code H21 are shown.
o
When float switch ON has operated 2 times within 20 minutes, error code H35 are shown.