RF/EF Set-Up
(See page 111 for more information)
Table 23: Return Fan/Exhaust Fan Set-up Menu
RF/EF Ctrl is an adjustable parameter used to select how the
return/exhaust fans are to be controlled. The exhaust fans
can be controlled by the building pressure or by a percentage
of return/exhaust air fan speed from 5% to 100%. The speed
option is typically used with a building automation system.
Remote RAF Cap is an adjustable item for setting the return
fan speed by the keypad or by a network control signal.
Remote ExhF Cap is an adjustable item for setting the
exhaust fan speed by the keypad or by a network control
signal.
BSP DB is an adjustable item which sets a dead band around
the BldgSP Spt parameter. No building static pressure control
action is taken when the current building static pressure input
is within this dead band.
BSP Period is an adjustable item which sets the “sampling
period” used in the PI control function that modulates the return
air or exhaust fan speed.
BSP Gain is an adjustable item which sets the “gain” used in
the PI control function that modulates the return air or exhaust
fan speed.
Max Spd Chg is an adjustable item that sets the maximum
value for a exhaust speed increase or decrease. This speed
change (either a positive or negative value) is added to the
current fan speed whenever the building static pressure is
outside of the deadband, and the BSP Period= time has
passed since the previous speed change.
RFEF Ctrl Delay is an adjustable item that sets the duration
of time that the minimum speed signal is sent to the variable
speed supply air fan after the return fan is started via a digital
output. Control reverts to either building pressure or speed
after the fan has been on for the BSPCtrlDelay (default 30
seconds).
Min Speed is an adjustable item the sets the minimum speed
of the RF/EF fan.
MinExStrtTime is an adjustable item that sets the Minimum
Exhaust Fan On Time (Default = 120 seconds). Once started,
the exhaust fan must run for a minimum of this time before it is
turned back off.
MinExStopTime is an adjustable item that sets the Minimum
Exhaust Fan Stop Time (Default = 120 seconds). Once
stopped, the exhaust fan must remain off for a minimum of this
time before it can be re-started.
MinExhOAPos is an adjustable item that sets the Minimum
Exhaust OA Position (default 5%). The outdoor air dampers
must be open more that this value for prop exhaust fan
operation.
MinExhSAFCap is an adjustable item that sets the Minimum
Exhaust SAF capacity (default 10%). The supply air fan speed
must be higher than this value for prop exhaust fan operation.
Exh On OA Pos is an adjustable item that turns on the exhaust
fan when the OA damper position reaches this setting.
Exh Mx OA Pos is an adjustable item that sets the OA damper
position at which the exhaust fan will be at is maximum speed.
MaxVentSpd is an adjustable item that sets the exhaust fan speed
when an external ventilation override input to the exhaust fan is
present.
Max RFEF RPM= is an adjustable item that sets the maximum RPM
value for the exhaust air fan.
NOTE: This is set based on the exhaust fan model size.
ECM Status is a status only item that indicates the current
status of the return/exhaust fan motor.
Item Display
Name
Default
Setting
Range
Password
Level
RF/EF Ctrl= BuildingP
None
6
Tracking*
BldgP
Spd/Net
OAD
Rem ExhF Cap= 5% 0–100% 6
BSP DB= 0.01in 0.0–0.1in 4
BSP Period= 5s 0–999s 4
BSP Gain= 0.2 0.0–100.0s 4
Max Spd Chg= 4% 0–100% 4
RFEF Ctrl Dly= 30s 0–999s 4
Min Speed= 5% 0–100% 4
MinExStrtTime= 120s 60–300s 4
MinExStopTime= 120s 60–300s 4
MinExhOAPos= 5% 0–100% 4
MinExhSAFCap= 10% 0–100% 4
Exh On OA Pos 40% 0–100% 4
Exh Mx OA Pos 100% 0–100% 4
MaxVentSpd= 100% 0–100% 2
Max RFEF RPM= 2600 0–5000 2
ECM Status
Failure Codes
are described in
the page 154
—
OK
2
HalSnsr
ElctHiT
MtrHiT
PModHiT
MtrLckd
PhzFail
LoDcVlt
HiDcVlt
LoMainV
HiMainV
NoComm
* Not applicable on DPS Units
coMMIssIon unIt
www.DaikinApplied.com 39 OM 1141-3 • MICROTECH UNIT CONTROLLER
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