•Power Exhaust - This accessory installs in the unit with a down flow economizer. Power exhaust plugs into the connector in the unit bulkhead. You must purchase 1EH0408 barometric relief when applying to a hori- zontal flow application.
•Manual Outdoor Air Damper - Like the motorized out- door air damper, each manual outdoor air damper includes a
•Motorized Outdoor Air Damper - The motorized out- door air damper includes a
•Smoke Detectors - The smoke detectors stop operation of the unit by interrupting power to the control board if smoke is detected within the air compartment.
•CO2 Sensor - Senses CO2 levels and automatically overrides the economizer when levels rise above the preset limits.
•Dirty Filter Switch - This kit includes a differential pres- sure switch that energizes the fault light on the unit ther- mostat, indicating that there is an abnormally high pressure drop across the filters.
•Coil Guard - Field installed decorative wire coil guard.
•Hail Guard - This kit includes a sloped hood which installs over the outside condenser coil and prevents damage to the coil fins from hail strikes. Field installed accessory only.
•Flue Exhaust Extension Kit - In locations with wind or weather conditions which may interfere with proper exhausting of furnace combustion products, this kit can be installed to prevent the flue exhaust from entering nearby fresh air intakes.
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•Gas Heat High Altitude Kit - This kit converts a gas heat unit to operate at high altitudes, 2,000 to 6,000 feet. Con- version kits are available for natural gas and propane.
•Gas Heat Propane Conversion Kit - This kit converts a
•Gas Piping Kit - Contains pipe nipples, fittings and gas cock required for gas supply connection with external shut off.
•Electric Heaters - The electric heaters range from 9 kW to 54kW and are available in all the voltage options of the base units. All heaters are dual staged. Cooling units include an adapter panel for easy installation of the elec- tric heaters. Necessary hardware and connectors are
included with the heaters. All heaters are intended for single point power supply.
•Low Limit / Compressor Lockout Kit
1.Compressor Lockout (CLO): To prevent mechanical (compressorized) operation of the unit during cold outdoor conditions where there is a risk of returning liquid refrigerant back to the compressors.
2.Low Limit Control (LLC): To prevent the supply air from dropping below a specified setpoint by utilizing the units first stage heating means when there is a demand for cooling during cold outside conditions.
•Metal Frame Filter Kit - Metal frame with polyester filter medium.
•Permanent Filters - Permanent filters are available.
•Roof Curbs - The roof curbs have insulated decks and are shipped disassembled The roof curbs are available in 8” and 14” heights. For applications with security con- cerns, burglar bars are available for the duct openings of the roof curbs.
•Roof Curb Transition - Single Piece Adapter (10” High) - Roof curbs for transitioning from Sunline™ units to Pred- ator® units. Fits 7.5 to 12.5 Sunline™ roof curbs only.
•Burglar Bars - Mount in the supply and return openings to prevent entry into the duct work.
•Thermostat - The units are designed to operate with 24- volt electronic and
REHEAT MODE SEQUENCE OF OPERATION
The reheat control board allows the user to select two differ- ent modes of operation via a jumper connection on the board. (See Figure 3.) Each mode is described below. Refer to Figures 3 - 5 when reading this section.
“NORMAL” MODE
When the reheat control board (RCB) detects a need for dehumidification (24VAC) at "HUM" via the field supplied dehumidistat connected to
When the room thermostat calls for first stage cooling, with or without a call for dehumidification, the RCB senses a signal through "Y1",
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