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Humidity Control
Unit can be controlled with either a Carrier accessory Thermidistat
device or a Carrier- -approved accessory humidistat (switch output).
The input for an accessory humidity sensor with 4 to 20 mA output
is another option available when an economizer board is installed.
Install the humidity control device according to the installation
instructions included with the accessory. Locate the device on a
solid interior wall in the conditioned space to sense average
humidity. Carrier Thermidistat device wiring connections are
shown in Fig. 13. General humidistat wiring connections are
shown in Fig. 14. Configuration of the unit control is required to
specify the control input type before unit operation. Refer to the
Controls, Start- -up, Operation and Troubleshooting manual for
configuration.
Units with the Humidi- -MiZert option receive a discrete input
from a field- -installed device (such as from the Carrier humidistat
or Thermidistat device). The discrete input is connected to the TB1
terminal strip points labeled Humidistat 1 and 2. As this is a
discrete input, one of the connection points is for power to the
switch and the other is the return path. (See Fig. 14.)
A space relative humidity sensor input (SP.RH) is only available if
an economizer board (ECB) is installed in the unit and then the
sensor can be connected to the OAQ point TB1- -4. (See Fig. 14.)
This input is used instead of the discrete humidistat or thermidistat
inputs. The input controls the Humidi- -MiZer using the 4- -20mA as
percent humidity. The relative humidity value (measured by the
relative humidity sensor) can be displayed on the Scrolling
Marquee, in the space through a System Pilott device, or can be
read by other CCN devices where it can be used to perform more
advanced functions. The humidity sensor must be configured
correctly; refer to the Controls, Start- -up, Operation, and
Troubleshooting manual for details.
If the customer also wishes to install a smoke detector into a
Humidi- -MiZer equipped 50PG unit, the fire shutdown connection
points are on Plug PL-19, located in the economizer section. See
the unit wiring schematic for wiring.
detector, see Fig. 15.
Point 19-3 is the 24 vac power source for the detector and point
19-5 is the 24 vac signal input for fire shutdown.
More information is available in the third party control section of
the controls, start-up, operation, and troubleshooting manual.
Step 7 — Install Outdoor Air Hoods (Units with
Economizer)
Perform the following procedure to install the outdoor-air hoods:
1. Economizer and barometric relief/power exhaust hoods are
located in the condenser section under the slanted coil for
shipping. (See Fig. 16.) Barometric relief/power exhaust
hoods are shipped
inside each
Remove screws that secure the wooden rails of the hood
assemblies to the unit. Save screws. Slide complete
assembly from condenser section.
Fig. 16 - - Economizer and Barometric Relief/Power Exhaust
For third- -part smoke
economizer hood.
15
WOODEN RAILS
Hoods Shipping Positions
ECONOMIZER
BAROMETRIC RELIEF
PANEL
DAMPER SCREW (TYP)
Fig. 17 - - Hood Installation
2. Remove the screws that secure the economizer and
barometric relief/power exhaust hoods to the wooden
railing. Discard or recycle wooden rails. Save the screws.
3. The barometric relief dampers are factory-installed on to the
economizer panel for shipping. Remove the screw holding
the barometric relief dampers to the panel. Dampers should
be free to swing open during operation. (See Fig. 17.)
4. Hang the barometric relief/power exhaust hood on the
mounting flange on the economizer panel. Secure hood to
panel with screws saved from Step 2. (See Fig. 17 and 18.)
Repeat for second hood.
POWER EXHAUST/
BAROMETRIC
RELIEF HOODS
ECONOMIZER
HOODS
C06259
BAFFLE
ECONOMIZER
HOODS
POWER EXHAUST/
BAROMETRIC
RELIEF HOODS
C06261
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