Reznor MAPS II Unit Installation Manual - Manual (Page 35)

Form I-MAPS II, P/N 206131 (Rev 13), Page 35
Option AR1 - Provides continuous
intake air opening. Review Build-
ing Energy Codes for approval.
(1) Outside Air Intake Hood
(Option AS16 or AS19)
Required
(2) Horizontal Outside Air Inlet
Opening
Option AR8 - Motorized outside air
damper is opened 100% during
system operation. If system is dis-
abled, outside air damper is closed
by spring return.
(1) Outside Air Intake Hood
(Option AS16 or AS19)
Required
(2) Horizontal Outside Air Intake
Opening
(4) Outside Air Dampers
(6) 2-Position Damper Motor
(open/closed)
Option AR11 - Provides manual
adjustment of return and outside
air dampers.
(1) Outside Air Intake Hood
(Option AS16) Required
(2) Horizontal Outside Air Inlet
Opening
(3) Bottom Return Air Opening
(4) Outside Air Dampers
(5) Return Air Dampers
Option AR17 - Motorized outside
air dampers are driven 100% open
and return air dampers are driven
100% closed when the system is
enabled. If system is disabled, out-
side air dampers are closed (return
air dampers opened) by spring
return. Field-installed time clocks
may provide for occupied and
unoccupied control sequences.
(1) Outside Air Intake Hood
(Option AS16) Required
(2) Horizontal Outside Air Inlet
Opening
(3) Bottom Return Air Opening
(4) Outside Air Dampers
(5) Return Air Dampers
(6) 2-Position Damper Motor
(either 100% outside air or
100% return air)
Option AR18 - Motorized outside air
dampers and return air dampers.
Damper positions are controlled
by a potentiometer that is installed
in the space.
(1) Outside Air Intake Hood
(Option AS16) Required
(2) Horizontal Outside Air Inlet
Opening
(3) Bottom Return Air Opening
(4) Outside Air Dampers
(5) Return Air Dampers
(6) Modulating Damper Motor
(7) Remote Potentiometer
(shipped separately)
Option AR23 - Modulates return
and outside air damper positions
to maintain zone pressure (modu-
lates from zero to 100%) by
regulating return and outside air
quantities (constant volume).
(1) Outside Air Intake Hood
(Option AS16) Required
(2) Horizontal Outside Air Inlet
Opening
(3) Bottom Return Air Opening
(4) Outside Air Dampers
(5) Return Air Dampers
(6) Modulating Damper Motor
(7) Remote Pressure Null Switch
(0-100% outside air) (shipped
separately)
Option AR27 - Modulates return
and outside air damper positions
to maintain zone pressure (modu-
lates from zero to 100%) by
regulating return and outside air
quantities (constant volume airflow
with minimum outside air damper
position).
(1) Outside Air Intake Hood
(Option AS16) Required
(2) Horizontal Outside Air Inlet
Opening
(3) Bottom Return Air Opening
(4) Outside Air Dampers
(5) Return Air Dampers
(6) Modulating Damper Motor
(7) Remote Pressure Null Switch
(minimum outside air damper
position) (shipped separately)
Damper Linkage Damper linkage provides limited air balance of return and outside air quanti-
ties. Return duct and outside air hood pressure drop differentials may require
field-installed balancing devices.
NOTES: Damper linkage may not provide adequate air balance of return and
outside air quantities. Compare return duct and outside air inlet hood pressure
drops to determine balancing requirements. Damper operation is not integrated
with the standard system controller. If equipped with Option BNC1 and a time
clock, the controller will close the dampers.
Pressure Null Switch
in Damper Options
AR23 and AR27
The pressure null switch used in Option AR23 and AR27 is a Dwyer #1640-0
with a range of .01-.20" w.c. It is shipped separately for field installation. Refer
to the following paragraphs and the manufacturer's installation instructions
included with the switch.
Description and Application - The pressure null switch is a diaphragm operated
differential pressure switch used in makeup air applications to control build-
ing pressure. It maintains a selected positive or negative pressure setpoint by
changing the amount of outside air being introduced to the building through
the modulating outside air dampers. As more pressure is required in the build-