Satchwell IAC 600, Руководство пользователя

Страница: 18 / 24

Fig.4
Note:–
The actual terminal block is
a double block running
across the bottom of the
IAC. The top (double
height) block contains
terminals 1 to 33 and the
bottom (single height)
contains 34 to 41 and all of
the Ground and isolated
Ground terminals.
Terminal numbers run
from left to right.
6
Ensure Terminal 2 is
earthed.
66
The 24Vac Supply must
be fused with a 2A fuse.
Terminal 5 is not used.
If an earth busbar is to be
used then it must be
connected to a single
Ground terminal on the IAC
by a single cable which
should be as short as
possible and no more than
150mm long. Earth wire
minimum 30/0.25 (1.5mm
2
)
Stranded Cable.
PRESET 4 – Full air-conditioning including variable Fan Speed Control
Exhaust
Air
Outside
Air
Time re-synchronization
Fan Fail Clear
Single Step Humidifier
Pre-heater
Common Cooler
Battery
Supply
Humidity
Heater
Battery
Extract/
Recirc.
Damper
Supply
Supply Fan
Speed
Supply
Velocity
Sensor
Extract Velocity
Sensor
Pre-heater Temperature Sensor
Supply
Extract
Connect to any IAC 600
isolated ground
terminal
Connect to any IAC 600
terminal
Connect to any
IAC 600
terminal
Supply
Damper
Supply Temperature Sensor
Filter Dirty
Humidifier
Extract Fan
Speed
Connect to any IAC 600
terminal
Connect to any
IAC 600
terminal
Connect to any IAC 600
terminal
Smoke
Fan Fail Clear
Time re-synchronization
TIME SCHEDULES
08:00 to 17:00
Connected to the temperature and humidity loops.
The time re-synchronization input will re-synchronize the IAC time to
midnight Monday.
TEMPERATURE LOOP
Set value
50
°
C
Stage 1 and 2
Proportional Band
10
Integral Action 300
Derivative Action 0
Ramp Time 60
Sample Time 10
The supply and extract fans are speed controlled from the velocity
sensors, their set values being determined by the heating and
cooling control demand signals.
The main temperature loop operates a heater battery and common
cooler battery. The dampers are modulated from the heating and
cooling control demand signals and have a minimum fresh air setting
of 30%. In the event of the smoke switch activating the
recirculation/extract dampers will go to 100%, the supply damper to
0%, the supply fan will go to 0% and the extract fan to 75% of the full
fan speed.
The temperature loop is overridden off if the fans stop.
HUMIDITY LOOP
Set value
19% RH
Stage 1 and 2
Proportional Band
10
Integral Action 300
Derivative Action 0
Ramp Time 60
Sample Time 10
The humidity loop operates a humidifier and common cooler battery.
The humidifier can be a single switched output operating at 0% of the
control signal or a modulating valve and actuator.
The humidity loop is overridden off if the fans stop.
PREHEATER LOOP
The preheater output is a simple on/off triggered at a set temperature.
On at 1
°
C
Off at 1
°
C
SMOKE OVERRIDE
Under smoke conditions the following actions will betaken:
Supply Damper
0%
Recirculation/Extract Damper 100%
Supply Fan Off
Extract Fan 75%
FAN SPEED LOOPS
Stage 1 and 2
Proportional Band
10
Integral Action 300
Derivative Action 0
Ramp Time 60
Sample Time 10
Look-up Table IN OUT
0 0
10 2
20 3
30 4
40 6
50 10
60 16
70 25
80 40
90 63
100 100
There are two fan speed control loops, one for the supply and one for
the extract fan. The set values for the fan speed loops are derived
from the temperature loop heating and cooling control signals.
If the fan fails the temperature and humidity controllers are
overridden off. A digital input is supplied to clear the fan failure and
remove the controller override.
DS 2.951A 18 - 24 05/98