Cooling Mode - Midea MSV1-09HRDN1-QC2A Service Manual

9.5 Cooling Mode

9.5.1 The operation frequency of compressor after starting submits to following rule.
When the machine is running and ∆T (=room temp. – setting temp.) changes, the frequency of compressor will
rise or descend a grade (7 minutes after starting).
After starting, if ∆T stays in a zone for 3 minutes, the frequency will change as follow:
Zone A : Current frequency rise a grade till the maximum grade.
Zone B: Elevate or keep or descend the frequency of compressor.
Zone H: Compressor stops after running as the minimum frequency for 60 minutes or ∆T is less than -2℃.
9.5.2 Indoor heat exchanger anti-freezing function.
If T2 is lower than 0℃, the compressor stops and resumes when T2>5℃.
9.5.3 Outdoor unit current control in cooling mode(refer to the parameter table)
Remark:
9K Model
12K Model
9.5.4 Rating capacity test function
1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press "TURBO" button on
controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into
rating capacity test mode, the buzzer will make a "di" sound for 2 seconds continuously. Also, indoor fan will change to
rating speed, the frequency of compressor will be fixed as rating value. Any condition of above is not satisfied, the
machine can not be turned into rating capacity test mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or setting
temperature.
9.5.5 Turbo function(press the "TURBO" button on remote controller)
1) Elevate current frequency to a higher grade.
2) Indoor fan turns to turbo speed.
3) After running for 30 minutes the machine will turn back to previous setting mode.
3.5
3.0
-0.5
-1.0
I3COOL
I2COOL
I1COOL
I1COOL
5.0 A
5.2 A
A
B
H
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
I2COOL I3COOL
6.5 A
6.4 A
7.5 A
7.5 A
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