MicroMetl ECD-SRT34SA-DWES - Safety Considerations; Cut Hazard; Electrical Shock Hazard; General Safety Practices

1
Read these instructions completely before attempting to install the
Vertical economizer Accessory.
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . .1
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Economizer Sensor Usage . . . . . . . . . . . . . . .2
ACCESSORIES LIST. . . . . . . . . . . . . . . . . . . . .2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 2-5
CONFIGURATION . . . . . . . . . . . . . . . . . . . . . 5-9
Economizer Standard Sensors . . . . . . . . . . . .5
Economizer Control Modes . . . . . . . . . . . . .5-9
Sequence of Operation . . . . . . . . . . . . . . . 9-10
Performance Data . . . . . . . . . . . . . . . . . . . . . 10
TROUBLESHOOTING . . . . . . . . . . . . . . . .11-12
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualied service personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions of
replacing lters. All other operations should be performed by trained
service personnel. When working on air-conditioning equipment, observe
precautions in the literature, tags, and labels attached to the unit, and
other safety precautions that may apply. Follow all safety codes. Wear
safety glasses and work gloves.
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, and CAUTION.
These words are used with the safety-alert symbol. DANGER identies
the most serious hazards which will result in severe personal injury or
death. WARNING signies a hazard 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 solid-state control system optimizes energy
consumption, zone comfort, and equipment cycling by operating the
compressors when the outdoor-air is too warm (and/or humid), integrating
the compressor with outdoor air when free cooling is available, and
locking out the compressor when outdoor-air is unacceptable. Demand
control ventilation is supported.
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 an outdoor air sensor, supply
(sometimes called a mixed or discharge) air temperature sensor, and low
temperature compressor lockout switch. ECD-SRT**SA-DWZS models
also include a differential enthalpy for eld installation in return duct.
Outdoor enthalpy, indoor enthalpy, and CO2 sensors are available for
eld installation. See Table 3 for sensor usage.
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 economizer controller.
See Table 1 for package usage. See Table 2 for package contents. See
Table 3 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(es) to unit and install lockout
tag(s). Unit may have more than one power switch.
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.
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Installation Instructions
ECD-SRT**SA Series Economizer with W7212 Controller
Small Rooftop Products
Select 2 to 15 Tons
Vertical Economizer Accessory
with W7212 Electro-Mechanical Controls
Table 1 - Package Usage
Vertical Economizers with W7212 Controller and Siemens Actuator
Chassis Size Economizer PN Outside Air and Differential Sensors
Chassis 1-2
ECD-SRT12SA-DWFS
ECD-SRT12SA-DWDS
ECD-SRT12SA-DWES
ECD-SRT12SA-DWZS
Fixed OA Dry Bulb Sensor
Adjustable OA Dry Bulb Sensor
Enthalpy OA Sensor
Enthalpy OA and Differential Sensor
Chassis 3-4
ECD-SRT34SA-DWFS
ECD-SRT34SA-DWDS
ECD-SRT34SA-DWES
ECD-SRT34SA-DWZS
Fixed OA Dry Bulb Sensor
Adjustable OA Dry Bulb Sensor
Enthalpy OA Sensor
Enthalpy OA and Differential Sensor
Chassis 5
ECD-SRT05SA-DWFS
ECD-SRT05SA-DWDS
ECD-SRT05SA-DWES
ECD-SRT05SA-DWZS
Fixed OA Dry Bulb Sensor
Adjustable OA Dry Bulb Sensor
Enthalpy OA Sensor
Enthalpy OA and Differential Sensor