Control Specification DAMA-SM-21-001
44 Functions and Control
3.10 Liquid Compression Protection Function
Outline In order to increase the dependability of the compressor, the compressor is stopped according
to the outdoor temperature.
Details Operation stops depending on the outdoor temperature.
The compressor turns off under the conditions that the system is in cooling operation and
outdoor temperature is below X°C (X°F).
X refer to table below based on models
3.11 Defrost Control
Outline Heat Pump Only
Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its fixed value when finishing.
Details Conditions for Starting Defrost
The starting conditions must be made with the outdoor air temperature and heat exchanger
temperature. Under the conditions that the system is in heating operation, 6 minutes after the
compressor is started and more than 28 minutes of accumulated time pass since the start of the
operation or ending the defrosting.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. (4°C-22°C) or (39.2°F to
71.6°F)
09 12 18 24
Temperature (°C) 0 0 -12.0 -12.0
09 12 18 24
Temperature (°F) 32.0 32.0 10.4 10.4
Class
Time (sec) Pulse
ABCDEFGH
09 40 60 40 630 400 300 300 200
12 40 60 50 630 400 300 300 350
18 60 120 50 460 450 450 450 450
24 60 120 50 460 480 480 480 480
Frequency
Compressor
Four way valve
Fan
Initial opening
5sec.5sec.
0Hz
0Hz
A
B
CD
PI control
E
F
G
H
ON
OFF
ON
OFF
ON
OFF
Electronic expansion
valve opening
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