16 OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
1.6 OPTIONAL EQUIPMENT
1.6 Optional Equipment
1.6.1 Humidistat/Dehumidistat
As an option for systems employing an ATech 1.1 or ATech 1.2 thermostat, a room mounted humidistat
and/or dehumidistat may be shipped loose for field installation. Each device has an adjustment dial on the
front where the operator selects the desired setpoint.
If an optional humidifier is selected, the humidistat is included to control its operation. The humidistat controls
the humidifier’s operation independently of the control thermostat; however, the blower must be on for the
humidifier to operate.
If the heat/reheat option is selected, a dehumidistat is provided. If room humidity rises above setpoint when
the demand for cooling is satisfied, the dehumidistat signals the compressor to turn on, removing humidity.
At the same time, the heater(s) are turned on to offset the cooling effect, thus maintaining the temperature of
the space to be conditioned. Refer to the electrical drawing supplied with your unit for details specific to your
system.
1.6.2 Temperature/Humidity Sensor
As a standard for systems that use the E² microprocessor controller, a temperature/humidity (T/H) sensor
is typically factory mounted in the return airstream for room air control. As an option, the T/H sensor may be
shipped loose for field installation. See section 2.7.6.5, and the electrical drawing supplied with your unit for
details specific to your system.
1.6.3 Heaters
The OHS unit may incorporate heaters for reheating the supply air as required to offset the sensible cooling
of the system during the dehumidification cycle and for the automatic heating mode. Electric resistance
heating elements are factory installed in the supply airstream to heat the supply air. The heating elements
are protected with line fuses (manual and/or automatic), thermal fuse links, and over-temperature safety
switches which automatically reset.
As an option, hot water reheat may be selected for automatic sensible reheating during the dehumidification
cycle. A hot water heating coil is factory installed in the supply air-stream. A valve is provided to control the
flow of hot water through the coil to maintain the correct reheat temperature.
Hot gas reheat may be selected (for CeilAir units with DX cooling only) for automatic sensible reheating
during the dehumidification cycle. Hot compressor discharge gas is diverted from the condenser to a hot gas
heating coil mounted in the supply airstream.
1.6.4 Humidifier
CeilAir systems may utilize an optional electrode steam humidifier. The humidifier is factory installed inside
the air conditioner and includes fill and drain valves and associated piping. Operation of the humidifier’s fill
and drain cycles is based on water conductivity and is maintained by the humidifier controller. An operating
manual for the humidifier is provided with the unit separately. Refer to that manual for detailed information
about operating the humidifier
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