AIRFLOW CONFIGURATIONS
Variable-Air-Volume– Eco2 units are available for single-zone variable-air-volume (VAV) applications. Supply fans are controlled to the supply duct static pressure setpoint, which can be reset via a BAS, or through an analog voltage input on the unit controller for optimized duct static pressure control. The static pressure transducer is provided in the rooftop unit, and 5/16” or 1/4” plastic tubing and static pressure sensor must be supplied by others and installed approximately 3/4 down the longest duct run.
Constant Volume – Eco2 units are available for single- zone constant volume applications. Control can be used with a zone sensor, thermostat, or building automation system.
COOLING AND HEATING CONFIGURATIONS
Cooling Only – For applications where no heat is required, or heating is provided elsewhere within the building HVAC system, cooling only units include an empty discharge plenum. Supply duct connections are configurable for bottom, left or right discharge. The supply air temperature sensor is included and factory- installed.
Staged Gas Heat – For applications requiring gas heat for morning warm-up, or other heating needs, a staged natural gas furnace is available. The furnace is located in the discharge plenum, downstream of the supply fan. The supply air temperature sensor is located across the face of the supply duct opening in the unit. Furnaces are designed in 375 mbh modules with one stage each. Three are available on the YPAL050-061 with bottom discharge and two are available on the YPAL050-061 with left-side discharge. Ignition and safety controls are included and factory-wired.
POWER OPTIONS
Single-point supply with terminal block – This configuration is standard, and includes three terminals for the incoming 3-phase power and is the standard configuration for the Eco2 product. It includes the en- closure, terminal-block, and interconnecting wiring to the compressors, heater and furnace controls, all fans, etc. In this configuration, code requires that a means of disconnect (not provided) must be installed at the site within line-of-sight of the equipment.
Single-point supply with non-fused disconnect switch
–This option is the same the single-point with terminal block option except it includes a unit-mounted through- the-door manual non-fused disconnect switch with an
external, lockable handle (in compliance with Article 440-14 of N.E.C.). This option provides a means to isolate the unit power voltage for servicing. Others must supply separate external fusing which must comply with the National Electric Code and/or local codes.
Dual-point supply with terminal block – This option in- cludes enclosure, terminal blocks circuited to the supply and exhaust fans and control transformer and a second set of terminal blocks with interconnecting wiring to the compressors, heat (if applicable) and condenser.
Convenience Outlet – This options includes a powered 115V GFCI convenience outlet that can be used for powering tools or lights for servicing. A protective cover plate is included while not in use. The outlet is located on the bottom left hand corner of the power panel.
CONTROL FEATURES AND OPTIONS
Simplicity Elite Unit Controller – All Eco2 units are equipped with a factory-installed, programmed and commissioned unit controller with all I/O capabilities and control sequences. The controls include all on-board diagnostic, safety and control features to operate the rooftop unit. Two RS485 communication ports are in- cluded as standard with one alarm output, a shutdown contact, smoke ventilation contact, analog inputs for supply air temperature and duct static pressure reset, along with a variety of other capabilities.
Standard Ambient – YPAL050-061 models operate down to 40°F as standard.
Low Ambient – This option includes low ambient control of the first refrigerant circuit down to 0°F through the use of suction and discharge pressure transducer on circuit one, and condenser fan speed using a variable- frequency drive on the first condenser fan of circuit one. Mechanical cooling with circuit two is locked out below 45°F (adjustable).
Flexsys bypass control option is not available with elite controller.
SENSOR AND THERMOSTAT AND SENSOR OPTIONS
Wall-Mount Zone Sensor – A thermistor zone sen- sor for wall mounting. This zone sensor is for sensing temperature only, and does not include any setpoint adjustment features.
7-Wire Thermostat – This option is for a ship-loose thermostat to interface with the Eco2 unit. All models, YPAL050-061, include an interface for a 7-wire ther- mostat as standard.
