(Mar, 2012)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
1.6.5 Optional Equipment
1.6.5.1 Humidistat/Dehumidistat
As an option for systems utilizing an A-Tech 1.1 or
A-Tech 1.2 thermostat, a room mounted humidistat
and/or dehumidistat may be shipped loose for fi eld
installation. Each device has an adjustment dial
on the front where the operator selects the desired
setpoint.
If an optional humidifi er is selected, the humidistat
is included to control it’s operation. The humidistat
controls the humidifi er’s operation independent of the
control thermostat however, the blower must be on
for the humidifi er 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 satisfi ed, the dehumidistat signals
the compressor to turn on, removing humidity. At the
same time, the heater(s) are turned on to offset the cool-
ing effect thus maintaining the temperature of the space
to be conditioned. Refer to the electrical drawing supplied
with your unit for details specifi c to your system.
1.6.5.2 Temperature/Humidity Sensor
As a standard for systems utilizing the
E
² micro-
processor controller, a temperature/humidity (T/H)
sensor is typically factory mounted in the return air
stream for room air control. As an option, the T/H
sensor may be shipped loose for fi eld installation.
Refer to the electrical drawing supplied with your unit
for details specifi c to your system.
1.6.5.3 Heaters
The precision A/C unit may incorporate heaters for
reheating the supply air as required to offset the
sensible cooling of the system during the dehumidifi -
cation cycle and, for the automatic heating mode. Ni-
chrome wire electric resistance heating elements are
factory installed in the supply air stream to heat the
supply air. The heating elements are protected with
line fuses, 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 dehumidifi ca-
tion cycle. A hot water heating coil is factory installed
in the supply air stream. A valve is provided to control
the fl ow 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 reheat-
1-7
ing during the dehumidifi cation cycle. Hot compres-
sor discharge gas is diverted from the condenser to a
hot gas heating coil mounted in the supply air stream.
1.6.5.4 Humidifi er
CeilAiR
systems may utilize an optional electrode
steam humidifi er. The humidifi er is factory installed
inside the air conditioner and includes fi ll and drain
valves and associated piping. Operation of the
humidifi er’s fi ll and drain cycles is based on water
conductivity and is maintained by the humidifi er
controller. An operating manual for the humidifi er is
provided under separate cover. Refer to that manual
for detailed information on operation of the humidifi er.
1.6.5.5 Condensate Pump
An optional factory installed condensate pump may
be provided. The pump automatically eliminates
condensate and humidifi er fl ush water (if applicable)
from the drain pan. Should an overfl ow occur, an
internal overfl ow safety switch is wired to the system
controller to signal the alarm condition and automati-
cally shut down the compressor and optional humidi-
fi er until the condition is corrected. The blower(s) will
continue to operate.
1.6.5.6 Smoke Detector
Optionally mounted in the return air stream, a photo-
electric smoke detector is used to sense the pres-
ence of smoke and signal the controller when a
smoke alarm condition exists and shuts down the air
conditioner.
1.6.5.7 Firestat
Optionally mounted in the return air stream, a fi re de-
tector senses high return air temperature and signals
the controller when a fi re alarm condition exists and
shuts down the air conditioner.
1.6.5.8 Water Detector
As an option, SATS offers spot type or strip/cable
type water detectors. Upon sensing a water leak,
the water detector control circuit will signal the A/C
system controller of the alarm condition and shut
down the air conditioner if your unit is equipped
with an A-Tech 1.1 or A-Tech 1.2 thermostat. If your
unit is equipped with an
E
² controller, the default
program turns off cooling and humidifi cation while
the blower(s) continue to operate. The unit will
automatically restart when the condition is corrected.