Reznor RCB User Manual

Form CP-MAPSIII-D21, Doc No 303070, Page 8
3.2 Intake Damper
Control
The intake dampers operate based upon state, mode and one of the following user
selected sequences. The dampers are normally open and operational in the occupied
mode and closed to outside air in the unoccupied mode depending on the user selec-
tion.
1. 100% OA, (Option GF2A)
When the unit is to start, the outside air damper will modulate (point Y1 = 10Vdc)
and the supply fan will be commanded ON (point NO1 = On). If the unit is equipped
with an outside air damper, the damper actuator is electrically interlocked to the fan
start/stop such that the supply fan cannot start until the damper is 80% open. Air
inletcongurationOptionsAR8,AR2D,AR2L,andAR2Yareelectricallyinterlocked
with the supply fan.
OFF and Alarm Modes - The damper will be closed. Y1 = 0%.
2. External 0-10vdc Input, (Option GF1)
Occupied & Unoccupied Mode
The dampers will modulate from 0-100% (point Y1 = 0 to 10 Vdc) based user
supplied 0 - 10 Vdc input. 0 Volts input is 0% damper while 10V input is 100%
damper position. This is not allowed with Options AR8, AR2D, AR2L & AR2Y. The
software does not prevent the selection of this option. The fan status switch will
handletheblockowcondition.ThedamperisNOTelectricallyinterlockedwith
the supply fan.
Unoccupied OFF and Alarm Modes
The damper will be closed (Y1 = 0%).
NOTE: For unoccupied operation of this damper control option, set the unoccupied
ventilation enable variable to ON.
3. Two-Position Dampers (Option GF2)
Occupied Mode
The damper will open to the user adjustable occupied damper position setpoint
value (point Y1=10Vdc). For the damper options with only 100% outside air, the
mechanical interlock of 80% will not allow the fan to start. Adjust the outside air
setpoint to reach the minimum electrical interlock position.
Unoccupied Mode
With the unoccupied ventilation enable variable set to ON, the damper will open to
the user adjustable unoccupied damper position setpoint value (point Y1=0Vdc).
For the damper options with only 100% outside air, the mechanical interlock of
80% will not allow the fan to start. Adjust the outside air setpoint to reach the
minimum electrical interlock position. With the unoccupied ventilation enable
variable set to OFF, the damper will be commanded to 0%.
OFF and Alarm Modes - The damper will be closed. Y1 = 0%.
4. Four Positions based on 2 Digital Inputs (Option GF4)
Occupied Mode
Thedamperwillopentotheuseradjustabledenedpositionbasedupontwo
hardware input switches (ID9 & ID10).
Variable Name
Input Switch
Default Damper
Position
Display
Range
Y1 Output
Range
ID9 ID10
Aux_1_SP Open Open 20% 0-100% 0 – 10V
Aux_2_SP Close Open 40% 0-100% 0 – 10V
Aux_3_SP Open Close 60% 0-100% 0 – 10V
Aux_4_SP Close Close 80% 0-100% 0 – 10V
This option is not allowed with AR8, AR2D, AR2L, and AR2Y. The software does
not prevent the selection of this option. The fan status switch will handle the block
owcondition.
Unoccupied, OFF and Alarm Modes -The damper will be closed ( Y1 = 0%).
5. Building Pressure Control (Range -0.5 to 0.5” iwc) (Option GF5)
Occupied Mode
The dampers will modulate using a PI loop to maintain the building static pressure
setpoint, default 0.1” iwc Y1 will modulate from 0-100% open, 0-10V.
Unoccupied, OFF and Alarm Modes - The damper will be closed (Y1 = 0%).
3.0 Controls (Cont’d)

Reznor RCB Specifications

General

Brand	Reznor
Model	RCB
Category	Air Handlers
Language	English