2
IMPORTANT
: These economizers meet all the economizer
requirements as laid out in ASHRAE Standard 90.1-2010, Table
6.4.3.4.4 requirements and California’s Title 24 mandatory section
120.2 (fault detection and diagnostics) and prescriptive section
140.4 (life-cycle tests, damper leakage, sensor accuracy, etc).
Economizer must be installed perfectly square to avoid damper
leakage or damper binding. Squareness tol/- 1/32”.
Standard barometric relief dampers provide natural building
pressurization control. An optional power exhaust system is available
for applications requiring even greater exhaust capabilities. The
power exhaust set point is adjustable at the controller.
See Table 1 for economizer package usage. See Table 2 for
packing contents.
Unpack and inspect economizer contents from carton. Contact
MicroMetl immediatly if any parts are missing or damaged.
GENERAL
MicroMetl accessories simplify and minimize procedures on rooftop
applications. Read these instructions completely before beginning.
These installation instructions pertain to the vertical economizer.
1. Turn off unit power supply(s) and install lockout tag.
2.
Remove the existing unit filter access panel. Raise the panel
and swing the bottom outward. The panel is now disengaged
from the track and can be removed. (See Fig. 4.)
3. Remove the indoor coil access panel and discard. (See Fig. 4.)
4. The hood is shipped with the Ultra Low Leak Economizer.
Remove hood from packaging.
NOTE:
If the power exhaust accessory is to be installed on the unit,
the hood shipped with the Ultra Low Leak Economizer will not be
used
and may be discarded. Save the aluminum filter for use in the
power exhaust hood assembly.
5. Set the Ultra Low Leak Economizer upright.
6. Slide the Ultra Low Leak Economizer assembly into the
rooftop unit. (See Fig. 7). On small and large cabinets be sure
to engage the rear Ultra Low Leak Economizer flange under
the tabs in the return-air opening of the unit base. (See Fig. 8)
7. Secure the Ultra Low Leak Economizer to unit along side and
bottom flanges using the screws provided.
8. Remove the tape securing the relief dampers in place.
9. Remove and save the 12-pin jumper plug from the unit wiring
harness (located in the upper left corner of the unit). Insert the
Ultra Low Leak Economizer plug into the unit wiring harness.
Refer to Fig. 9 and 10A for wiring details.
Fig. 1 - Component Locations
—
(Small Economizer Shown)
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury and/or
death.
Disconnect power supply and install lockout tag before attempting to
install accessory.
!
Outside Air
Temperature
Sensor or
nthalpy Sensor
Actuator
(Hidden)
Wiring
Harness
Table 2 - Packaging List
Assembled Hood with Divider & Aluminum Filter(s)
Ultra Low Leak Damper Assembly
Self Drilling Screws
1/8" Gray Gasket
NOTE:
The 12-pin jumper plug should be saved for future use, in
the event that the Ultra Low Leak Economizer is removed from the
unit. The jumper plug is not needed as long as the Ultra Low Leak
Economizer is installed.
10. If Ultra Low Leak Economizer will be operating under enthalpy
control, an enthalpy sensor will be used in place of the dry bulb
sensor.
11. Remove the indoor fan motor access panel. (See Fig. 10.)
20k-Ohm Dry Bulb Sensor
SylkBus Sensor
Address Dip Switch array
Shipped for OA applications
SENSOR & CONTROLS
JADE requires a C7250A for Mixed Air (MA) sensing. The C7250A
temperature sensors are 20k Negative Temperature Coefficient
(NTC). The C7250A MA sensor is required for all applications and
must be mounted in the unit’s mixed air stream (normally the fan
section) either directly to the sheet metal of the fan using self-
tapping sheet metal screws, or in the air stream using the duct
mounting kit. The C7250A must be wired into the two terminals
on JADE labeled “MAT”. The C7250A sensor must be used in all
applications.
Optional Enthalpy or Dry Bulb Sensor
Both are optional, but at least one must be chosen. The Dry Bulb
Sensor C7250A, or the Enthalpy Sensor C7400S gets wired into
JADE’s S-BUS terminals. Either must be placed under the Outside
Air Hood, or in full exposure to the outside air weather conditions.
NOTE:
The protective film on the dip switch is only necessary
during the factory assembly process. Simply push through the film
to set the dip switches; this will not harm the device.
Once installed, a sensor can be changed to a different application
by simply changing the DIP switch setting and relocating to the
appropriate location.
