Installation and Maintenance
TWINFAN CONTROL
4
Operating the Twinfan Mains Control
Pressing any of the panel buttons will be accompanied by an
audible confirmation tone. The button functions are listed below.
Duty Share
(This button appears on CT-A models only).
Pressing this button will enable or disable the duty sharing feature.
When the Duty Share light is on, duty sharing is selected.
Fail
There are two ‘FAIL’ indicators, one under each Fan button. The
fail indicators show which fan has failed. In the event of a failure,
an audible alarm will also sound for 15 seconds. If the internal
configuration switches have been selected for a continuous audible
alarm, the alarm will continue until the fault is rectified.
Power
Pressing this button switches the unit ON or OFF. When
switched ON the associated light will show GREEN. When the
unit is switched OFF the light will show RED.
An AMBER light will indicate the unit is switched ON but there
is no 230v signal connected to the SL terminal inside the case.
WARNING
Switching the unit OFF on the front panel Power button
does not isolate the fan or the control.
Figure 7.
Twinfan Control buttons
Power
Fail
Fail
Duty
Share
Fan 2
Fan 1
Explanation of the button functions.
Fan 1 / Fan 2
Pressing either button selects that fan to run. If there is a fan
failure, the fail indicator will remain illuminated even after the fail-
ure has been rectified and the control must be reset (by pressing
the fan button to restart the fan.
Connections
to fan
Supply
230V ac. 50Hz
N L L SL L FL L1 L2 N H BL RD BK Y RUN FAULT
SUPPLY SWITCHED FAN FAN UNIT ICP RR RF
LIVE LIVE
Main terminal connections
Figure 8.
Connections to Control.
Run on Timer adjustment
A Run On facility is provided so that when the 230V ac signal
is disconnected from the SL terminals the fans can continue to
run on for a period of up to 60 minutes. The run on time is
set using a rotating screw (See fig. 9).
When the 230V ac signal is disconnected, the power lamp on
the front of the unit will illuminate AMBER to indicate there
is no SL signal.
Figure 9.
Run on adjustment
BL RD BK Y RUN FAULT
ICP RR RF
Run On
rotary
adjustment
0-60 mins
(clockwise)
