CAT 258 • REBEL APPLIED ROOFTOP 38 www.DaikinApplied.com
General Specification
2 .17 Blow-through Final Filters
A.
All units shall be provided with clogged filter
switches and alarm enunciation
B.
All units shall be provided with electronic pressure
transducer filter measuring controls integrated with
the BAS and alarm enunciation
C.
All units shall be provided with a through the wall
magnehelic filter gauge that displays filter loading.
D.
Unit shall be provided with a blow-through final filter
section.
E.
The filter rack shall be designed to accept a side
load 12" cartridge filter with a 1" header. The
manufacturer shall ship the rooftop unit with 12"
MERV 14 cartridge filter.
F.
The filter rack shall be designed to accept a face
load 12" cartridge filter. The manufacturer shall
ship the rooftop unit with 12" MERV 16 face load
cartridge filter. A walk in access section upstream of
face load filters is required for filter maintenance.
G.
The filter rack shall be designed to accept a face
load 12" cartridge filter. The manufacturer shall ship
the rooftop unit with 12" HEPA face load cartridge
filter. A walk-in access section upstream of face load
filters is required for filter maintenance.
2 .18 Outdoor/Return Air Section
A.
Unit shall be provided with a Metal Mesh pre-filter
in the outdoor air hood/section to prefilter large
particulate to prevent early filter clogging.
B.
Unit shall be provided with a 0–30% Outside Air
damper. The outdoor air hood shall be factory
installed and constructed from galvanized steel
finished with the same durable paint finish as
the main unit. The hood shall include moisture
eliminator filters to drain water away from the
entering air stream. The outside and return air
dampers shall be sized to handle 100% of the
supply air volume. The dampers shall be parallel
blade design. Damper blades shall be gasketed
with side seals to provide an air leakage rate of
1.5 cfm/square foot of damper area at 1" differential
pressure in according with testing defined in AMCA
500. Control of the dampers shall be by a factory
installed direct coupled actuator.
C.
Unit shall be provided with a 100% Outside Air
damper. The outdoor air hood shall be factory
installed and constructed from galvanized steel
finished with the same durable paint finish as
the main unit. The hood shall include moisture
eliminator filters to drain water away from the
entering air stream. The outside and return air
dampers shall be sized to handle 100% of the
supply air volume. The dampers shall be parallel
blade design. Damper blades shall be gasketed
with side seals to provide an air leakage rate of
1.5 cfm/square foot of damper area at 1" differential
pressure in according with testing defined in AMCA
500. Control of the dampers shall be by a factory
installed direct coupled actuator.
D.
Unit shall be provided with an outdoor air
economizer section. The economizer section shall
include outdoor, return, and exhaust air dampers.
The economizer operation shall be fully integral
to the mechanical cooling and allow up to 100%
of mechanical cooling if needed to maintain the
cooling discharge air temperature. The outdoor air
hood shall be factory installed and constructed from
galvanized steel finished with the same durable
paint finish as the main unit. The hood shall include
moisture eliminator filters to drain water away from
the entering air stream. The outside and return
air dampers shall be sized to handle 100% of the
supply air volume. The dampers shall be parallel
blade design. Damper blades shall be gasketed
with side seals to provide an air leakage rate of
1.5 cfm/square foot of damper area at 1" differential
pressure in according with testing defined in AMCA
500. Control of the dampers shall be by a factory
installed direct coupled actuator.
E.
Damper actuator shall be fully modulating and spring
return type. A comparative drybulb control shall be
provided to sense and compare drybulb in both
the outdoor and return air streams to determine if
outdoor air is suitable for “free” cooling. If outdoor air
is suitable for “free” cooling, the outdoor air dampers
shall modulate in response to the unit’s temperature
control system.
F.
Damper actuator shall be fully modulating and spring
return type. A comparative enthalpy control shall be
provided to sense and compare enthalpy in both
the outdoor and return air streams to determine if
outdoor air is suitable for “free” cooling. If outdoor air
is suitable for “free” cooling, the outdoor air dampers
shall modulate in response to the unit’s temperature
control system.
G.
A barometric exhaust damper shall be provided to
exhaust air out of the unit. A bird screen shall be
provided to prevent infiltration of rain and foreign
materials.
H. A power closure barometric exhaust damper shall
be provided to exhaust air out of the back of the
unit. The actuator will hold the damper shut during
unoccupied mode. A bird screen shall be provided to
prevent infiltration of rain and foreign materials.
I.
All units must be capable of CO
2
control. Outside air
damper position will modulate between the Demand
Control Ventilation Limit (minimum position setpoint)
and the Ventilation Limit (maximum non-economizer
position setpoint) to satisfy the space requirements.
Damper position will be controlled to the greater of
the two command signals, either minimum outside
air flow or space IAQ (CO
2
).
J.
Provide the units with factory installed, and tested
thermal dispertion style outdoor air flow measuring
station.
Summary of Contents for DPSA
Page 41: ......
