11-3
CONTROL SYSTEM
SM PNXDCI 1-A.1 GB
The following table describes the open loop of outdoor fan speed, at cool mode, related to outdoor air temperature and the
frequency (ROM table):
Freq
Outdoor air temperature (OAT)
~ - 10 0 10 20 30 or fauly 40 50~
0
20
0000 0 00
80 120 220 460 600 730 780
40
60
130 210 330 730 730 780 780
250 310 550 730 730 780 780
80 300 400 730 730 730 780 780
100~ 350 490 730 730 730 780 780
Notes
Linear interpolation will be used for values in between the outdoor temperature and the compressor frequencies.1.
The speed values, of the above table, are of 10 RPM resolution.2.
OFAN speeds are less than OFMinRPM, OFMinRPM will be used, and the OFMinRPM can’t be set less than 10rpm 3.
at lest.
11.1.10 EEV (electronic Expansion valve) Control
EEV opening determination in normal run mode
The Target EEV value is the sum of open loop value (OL) and a result of the accumulative collection values (CV). Tlie EEV
collections are calculated every 30 seconds.
EEV = EEV
0L
+ 2 EEVCP
EEV open loop setting [EEV
0
Lpart)
The EEV initial value (open loop) is determined according to the operation mode, the actual frequency and ODU model.
The values are determined according to the
“
EEV
OL
Parameters Table
”
EEV correction setting (EEVcvpart)
EEV
cv
is a collection EEV value, it’s calculated as follows:
EEV•
cv
= 0 during the first 1 minutes after the compressor starts.
After • 1 minutes are over, the EEV
cv
is updated and calculated every 30 seconds.
The EEV
cv
is based only on discharge super heat correction:
EEV
cv
= EEV
SH Discharge
EEV
SH Discharge
is function of
*SH
Discharge
* and Der SH
Dischaige
, where:
For COoling. SH
DischargeC
= CTT- OMT
For Heating. SH
Discharge
= CTT- ICT
Der SH
Discharge
: SH
Dlscharge
(current) - SH
Discharge
(previous)
11.1.11 Reversing Valve (RV) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.
11.1.12 Ionizer Control
Ioniser is on when unit is on AND indoor fan is on AND Ionizer power switch (on Ionizer) is on.
11.1.13 Electro Static Filter )ESF( Control
ESF is on when ESF switch is on, Safety switch is pressed, unit is on, AND indoor fan is on.
11.1.14 Base Heater Control
When OAT is connected, Base Heater will be on when unit is in heating and OAT<2
O
C.
When OAT is disconnected, Base Heater will be on when unit is in heating.
11.2 Fan Mode
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusting automatically according to the difference
between actual room temperature and user set point temperature.
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