Johnson Controls
5513350-JTG-1018
114
Guide Specifications (Continued)
Outside Airflow Measurement [Optional] -
Fresh
air shall be introduced into the unit via an outside
airflow measurement station for full airflow measure
-
ment from 0–100% outside airflow. The airflow mea
-
surement station shall be designed into the unit and
includes all controls, dampers, and components to
monitor airflow accurately.
Economizer with Fault Detection and Diagnostics
(FDD) -
Economizer with FDD shall always be pro
-
vided when economizer is selected. As required per
ASHRAE 90.1-2016 and California Title 24, FDD sys-
tem shall provide alarms for:
• Damper not modulating.
• Economizer not available for suitable outside air
conditions.
• Economizer available for unfavorable outside air
conditions.
• Excess outside air.
• Temperature sensor failure/fault.
Energy Recovery Wheel (ERW) [Optional]
1.
ERW performance shall be AHRI 1060 certified and
bear the AHRI certified label. Components that are
independently tested or rated in accordance with
shall not be acceptable. Manufacturer membership in
AHRI is not an acceptable substitute. Certified com
-
ponents must be listed as active in the AHRI directory
(
).
2. The energy recovery cassette shall be a UL Recog-
nized Component for fire and electrical safety and
bear the UR mark. Recognized Components shall be
listed in the UL directory (
).
3.
The energy recovery cassette shall comply with
NFPA 90A standard by virtue of UL 1812 and UL 900
standards for fire tests to determine flammability and
smoke density.
4. The energy recovery cassette shall incorporate a ro-
tary wheel in an insulated cassette frame complete
with removable energy transfer media, seals, drive
motor, and drive belt. Cassette frame and structural
components shall be constructed of G90 galvanized
steel for corrosion resistance.
5.
Wheel structure shall consist of a welded hub, spoke,
and continuous rolled rim assembly of stainless steel,
and shall be self-supporting without energy transfer
segments present. Wheel structure shall be connect-
ed to the shaft by means of taper lock bushings.
6. Wheel bearings shall be permanently sealed and
selected for a minimum 30 year L10 life of 400,000
hours. Bearings requiring external grease fittings or
periodic maintenance are not acceptable.
7. Energy transfer media shall be constructed of a du-
rable synthetic lightweight polymer. Media shall be
wound continuously with one flat and one structur
-
al layer in an ideal parallel plate geometry. Airflow
across heat exchanger surface shall remain laminar.
Energy transfer media shall not exceed 3 inches in
depth. Energy transfer media shall be suitable for
use in corrosive, marine, or coastal environments
without the need for additional coatings. Energy
transfer media shall be capable of repeated wash
-
ings without significant degradation of the desiccant
bond as documented by an independent third party.
8. Desiccant shall be either silica gel or molecular sieve
and permanently bonded to the energy transfer me-
dia without the use of binders or adhesives, which
may degrade desiccant performance. Desiccants
not permanently bonded are not acceptable due to
potential delamination or erosion of the desiccant
from the energy transfer media. Desiccant shall be
non-migrating nor shall it dissolve or deliquesce in the
presence of water or high humidity.
9.
Wheels shall be provided with removable energy
transfer segments. The unit shall be designed to facili-
tate side serviceable ERW. Side service shall allow for
all ERW segments to be pulled for removal. Segments
shall be removable without the use of tools to facili
-
tate maintenance and cleaning. Energy recovery seg-
ments shall be cleanable outside of the cabinet with
detergent or alkaline coil cleaner and water. Energy
transfer segments shall be capable of submersion in
a cleaning solution. Submersion shall be capable of
restoring latent performance to within AHRI certified
performance limits.
10. All diameter and perimeter seals shall be provided
as part of the cassette assembly and shall be factory
set. Seals shall be non-contact nylon pile brush seal
orientated in a labyrinth style configuration. Diameter
seals shall be fully adjustable and easily accessible.
Perimeter seals shall be permanently mounted to
the wheel rim and not require adjustment. Seals that
mount to the frame are not acceptable.