11-2
CONTROL SYSTEM
SM PNXDCI 1-A.1 GB
11.1.4 Frequency Changes Control
.Frequency change rate is 1 Hz/sec
11.1.5 Compressor Starting Control
11.1.6 Minimum On and Off Time
3 minutes.
11.1.7 Indoor Fan Control
10 Indoor fan speeds are determined for each model. 5 speeds for cool/dry/fan modes and 5 speeds for heat mode.
When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will operate constantly at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is set according to the cool/
heat load.
11.1.7.1 Turbo Speed
The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is selected and under the
following conditions:
Difference between set point and actual room temperature is bigger then 3 degrees.
Room temperature > 22 for cooling, or < 25 for heating.
11.1.8 Heating Element Control
Heating element can be started if LOAD > 0.8* MaximumNLOAD AND Indoor Coil temperature <45.
The heating element will be stopped when LOAD < 0.5* MaximumNLOAD OR if Indoor Coil Temperature > 50.
11.1.9 Outdoor Fan Control
In cooling mode:
The OFAN speed is controlled according to the following objectives:
Mode Ofan Target Implementation
Cool Mode
Keep the condensation temperature to
the minimum possibly value
Keep OMT as low as possible down
to 27
O
C
The target OFAN speed is the sum of open loop value (OLs) and a result of the accumulative correction values (CV).
OFAN
Target
= OFAN
OL
+ ∑OFAN
CV
During 2 minutes after the
compressor start up
After 2 minutes
OFAN Open Loop Yes, Continuously according to
the software timer
No
OFAN Corrections No Yes, every 40 seconds
When OMT or OCT is faulty there will be no OFAN connections, and the OFAN will operate according to the open loop
table.
Frequency
Time
Min 10 Minutes
1
Minute
Step 1
Step 3
1
Minute
Step 2
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