IM 1272 • OPTILINE VERTICAL FAN COILS 24 www.DaikinApplied.com
Addendum
Fan Controls
1.
Fan Output Adjustment:
Fan output can be set to
minimum adjustment (AO2 Low (E7)) from 0-5 Vdc
and to maximum adjustment (AO2 High (E8)) from
5 to 10 Vdc.
These two values are adjusted by a balancing contractor
that will measure minimum and maximum CFM the fan
will supply and set the two values.
2.
Fan Control:
Fan should have option to run continuously
at low speed (Fan Low (E17)) (say 25–30% of max
design airflow) during occupied and dead band for
delivery outside air from suite HRV or OA vent duct
If there is a call for heating or cooling the fan would ramp
up to maximum design airflow for the FCU on the project.
3.
Fan Mode:
By pressing FAN button to toggle AUTO icon
ON and OFF to represent Auto Mode (“AUTO” show on
screen) and Continuous Mode. Continuous Mode will
keep fan running at pre-set minimum speed all time while
Auto Mode will run from 0%. During dead band, Auto
Mode will stop the fan while Continuous Mode will run
the fan at low speed as set in (Fan Low (E17)).
By pressing POWER button it will switch ON/OFF fan
and heating/cooling outputs to their default positions.
Figure 16: Fan Control Diagram
Special Notes
1. Fan bar will be shown according to the fan output when
reaches low speed, medium speed or 100% of max
output.
2. ESI (Energy Saving Input) Contact status — When the
contact is activated (Vacation or Room unoccupied),
a “Moon (
MODE
)” icon will be shown on the LCD and the
thermostat will change the set point temperatures to
Cooling & Heating to be ESIC & ESIH (refer to Engineer
table for details).When the contact is deactivated (Open)
(Room will be back to be occupied), it will set the set
point values back to normal.
3. The icon
MODE
,
MODE
,
MODE
, or
MODE
will be shown on LCD
while the programmable Schedule 1, 2, 3, or 4 is running.
4. If “MODE” button is pressed, there are three Schedule
modes “RUN, HALT, and STOP” for selection:
a.
RUN
mode means Running on Schedules. And at
the same time an icon (
MODE
) will be steadily shown
on the LCD.
b.
HALT
mode means temporarily using manual S.P
instead of “current” Schedule. And the icon (
MODE
)
will be flashing on the LCD.
c.
STOP
mode means using manual S.P instead
of “all” Schedules. i.e. Temporarily disable all
programmable Schedules. And the icon (
MODE
) will
NOT be shown on the LCD.
Examples of Engineering Mode:
5. E19 There is an adjustable time delay between heating
and cooling from 0 to 5 minutes.This delay time can be
adjusted by the “dLAy” parameter in the Engineer table.
The default is set to 0 minutes. This feature can be used
in addition to dead band for thermoelectric (Wax) control
valve actuators that have long 3 minute travel time to
prevent overlapping.
6. Proportional band “Pb” or (Stage Width) set in E12,
Integral Time “I-t” set in E4, Dead band offset “db”
set in E1.
7. E22 Dead Band option “dbOP”parameter set to 0 will
offset Heating from set point by db setting example 2 ºC
and starts Cooling at the set point Parameter set to 1 will
offset heating and cooling from the set point equally in
total db set example 2 ºC (1 ºC heating and 1ºC cooling)
8. E20 “dirC” Cooling set to 0 for Normally Open Valve set
to 1 for Normally Closed valve.
9. E21 “dirH” Heating set to 0 for Normally Open Valve set
to 1 for Normally Closed valve. T and other parameters.
