SiUS12-928_A
Control Specification
Function and Control
46
Indoor Frequency Command (
Δ
D signal)
The difference between a room thermistor temperature and the target temperature is taken as the
“
Δ
D signal” and is used for frequency command.
Values depend on the type of indoor unit.
∗
Th OFF = Thermostat OFF
Indoor Unit Capacity (S value)
The capacity of the indoor unit is a “
S
” value and is used for frequency command.
Frequency Initial Setting
<Outline>
When starting the compressor, or when conditions are varied due to the change of the operating
room, the frequency must be initialized according to the total of a maximum
Δ
D value of each room
and a total value of Q (
Σ
Q) of the operating room (the room in which the thermos is set to ON).
Q value: Indoor unit output determined from indoor unit volume, airflow rate and other factors.
PI Control (Determine Frequency Up / Down by
Δ
D Signal)
1. P control
A total of the
Δ
D value is calculated in each sampling time (20 seconds), and the frequency is
adjusted according to its difference from the frequency previously calculated.
2. I control
If the operating frequency is not change more than a certain fixed time, the frequency is
adjusted according to the
ΣΔ
D value.
When the
ΣΔ
D value is small...lower the frequency.
When the
ΣΔ
D value is large...increase the frequency.
3. Limit of frequency variation width
When the difference between input current and input current dropping value is less than 1.5 A,
the frequency increase width must be limited.
4. Frequency management when other controls are functioning
When each frequency is dropping;
Frequency management is carried out only when the frequency drops.
For limiting lower limit
Frequency management is carried out only when the frequency rises.
5. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set depending on the total of
S
values of a room.
When low noise commands come from the indoor unit in more than one room or when outdoor
unit low noise or quiet commands come from all the rooms, the upper limit frequency must be
lowered from the usual setting.
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
Temperature
difference
Δ
D
signal
–2.0°C (–3.6°F)
∗
Th
OFF
0°C (0°F)
4
2.0°C (3.6°F)
8
4.0°C (7.2°F)
C
–1.5°C (–2.7°F)
1
0.5°C (0.9°F)
5
2.5°C (4.5°F)
9
4.5°C (8.1°F)
D
–1.0°C (–1.8°F)
2
1.0°C (1.8°F)
6
3.0°C (5.4°F)
A
5.0°C (9°F)
E
–0.5°C (–0.9°F)
3
1.5°C (2.7°F)
7
3.5°C (6.3°F)
B
5.5°C (9.9°F)
F
Capacity
S
value
Capacity
S
value
9 kBtu
25
15 kBtu
50
12 kBtu
35
18 kBtu
60
Summary of Contents for SUPER MULTI NX G Series
Page 1: ...SiUS12 928_A Applied Models Inverter Multi Heat Pump G Series J Series...
Page 7: ...SiUS12 928_A Table of Contents vi...
Page 10: ...SiUS12 928_A 1 List of Functions Part 1 List of Functions 1 Functions 3...
Page 11: ...SiUS12 928_A List of Functions 2...
Page 17: ...SiUS12 928_A Specifications 8...
Page 23: ...SiUS12 928_A Specifications Specifications 14...
Page 25: ...SiUS12 928_A Printed Circuit Board Connector Wiring Diagram 16...
Page 37: ...SiUS12 928_A Function and Control 28...
Page 69: ...SiUS12 928_A Control Specification Function and Control 60...
Page 71: ...SiUS12 928_A Operation Manual 62...
Page 73: ...SiUS12 928_A Duct Free System Operation Manual 64 2 Duct Free System 2 1 Remote Controller...
Page 84: ...Duct Free System SiUS12 928_A 75 Operation Manual...
Page 85: ...SiUS12 928_A Duct Free System Operation Manual 76 2 8 TIMER Operation...
Page 86: ...Duct Free System SiUS12 928_A 77 Operation Manual...
Page 87: ...SiUS12 928_A Duct Free System Operation Manual 78 2 9 Note for Multi System...
Page 88: ...Duct Free System SiUS12 928_A 79 Operation Manual...
Page 97: ...SiUS12 928_A Slim Duct Built In System Operation Manual 88...
Page 99: ...SiUS12 928_A Service Diagnosis 90...
Page 169: ...SiUS12 928_A Removal Procedure 160...
Page 225: ...SiUS12 928_A Trial Operation and Field Settings 216...
Page 235: ...SiUS12 928_A Appendix 226...