Invest MSC-24/QD FP, Service Manual

Page: 23 / 37

21
8.5.4 R
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,
y
8.5 Cooling Mode
8.5.1 After starting, the operation frequency of compressor submits to following rule.
D
-1.0
B
1.0
-0.5
0.5
1.5
C
A
Δ
T=(roo
m
temp)
– (s
etti
ng
Te
mp)
When the machine is running and Δ T(=room temp. – setting temp.) changes, the frequency of
compressor will rise or descend a grade (7 minutes after starting).
After starting, if Δ 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 F8.
Zone B: Keep the current frequency of compressor.
Zone C: Descend the current frequency of compressor until F1.
Zone D: Compressor stops after running as the minimum frequency F1 for 60 minutes or Δ T is less than
-2 .
8.5.2 Indoor heat exchanger anti-freezing function.
If T2 is lower than 0 , the compressor stops and resumes when T2>5 .
8.5.3 Outdoor unit current control in cooling mode(refer to the parameter table)
I3COOL
I2COOL
I1COOL
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
out
door unit
curr
ent
ating capacity test function
1)
indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. An
condition of above is not satisfied, the machine can not be turned into rating capacity test mode.