Since 1965
MicroMetl
Installation Instructions
3 to 15 Ton ULL Vertical
Economizer Accessory
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling and installing the accessory.
It is important to recognize safety information. This is the safety-
alert
!
symbol . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result
in severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used to
identify unsafe practices, which may result in minor personal injury
or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
GENERAL
The Economizer system utilizes the latest technology available
for integrating the use of free cooling with mechanical cooling
for packaged rooftop units. The code compliant Jade W7220
control system optimizes energy consumption, zone comfort, and
equipment cycling by operating the compressors when the outdoor-
air is too humid, integrating the compressor with outdoor air when
free cooling is available, and locking out the compressor when
outdoor-air temperature is too cold. Demand control ventilation is
supported.
This Economizer can be used with 1 or 2 speed indoor fan motor
units.
The Economizer system utilizes gear-drive technology with a
direct-mount spring return actuator that will close upon loss
of power. The Economizer system comes standard with fault
detection and diagnostics (FDD), an outdoor air sensor, and mixed
air temperature sensor (also called supply air temperature sensor).
Outdoor enthalpy, indoor (return) dry bulb or enthalpy, and CO2
sensors are available for field installation. See Table 5 for sensor
usage.
Standard integrated 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
Economizer controller.
See Table 1-3 for package usage. See Table 4 for package contents.
See Table 5 for sensor usage.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or death. Before
performing service or maintenance operations on the unit, always turn off
main power switch to unit and install lock(s) and lockout tag(s). Unit may
have more than one power switch. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating plate.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when handling
parts and servicing roof top units.
CAUTION
Failure to follow this caution may result in personal injury and damage to
the unit. Cover the duct opening as a precaution so objects cannot fall into
the return duct opening. Be sure to remove the cover when installation is
complete.
!
!
!
IMPORTANT: These economizers meet all
economizer damper requirements as specified in ASHRAE
90.1, IECC and California’s Title 24. Economizer must be
installed square to avoid damper leakage or damper
binding. Squareness tolerance is ± 1/32 inch.
IMPORTANT: Read these instructions completely
before attempting to install accessory economizer.
CONTENTS
Safety Consideration
General Descriptions
Usage Chart, Package Contents, Sensors
Accessories and Compliance
Installation
Economizer Performance Charts
Economizer Wiring Diagrams
48/50 LC07 Wiring
Enthalpy Accessory
Differential Return Sensor Accessory
Title 24 High Temp Limit
Demand Control Ventilation
Remote Fault Detection & Diagnostics
Economizer Jade Controller
Programming Jade W7220 Controller
Controller Menu Structure
Checkout Tests & Controller Terminals
Start-Up and Operation
Troubleshooting
SAFETY CONSIDERATIONS
Installation of this accessory can be hazardous due to system
pressures, electrical components and equipment, and equipment
locations (such as a roof or elevated surface). Only trained
qualified installers and service technicians should install, start-up,
and service this equipment.
When installing this accessory, observe precautions in the
literature and on any labels attached to the equipment and all
other safety precautions may apply.
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