Carrier 50PG20 Installation Instructions Manual page 24

Set heat anticipator settings as shown in Table 6.
Table 6—Heat Anticipator Settings
STAGE 1
(W1) ON
UNIT
ELECTRIC
SIZE
Voltage
HEAT (kW)
50PG
208/240
25 0.2
20-28 50 0.4
75 0.4
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
Field Control Wiring (Units with Optional Humidi- - -
MiZert Adaptive Dehumidification System)
Units require temperature control inputs for cooling and heating
operation and humidity control inputs for Humidi-MiZer
operation.
Temperature Control
The unit can be controlled with either a Carrier-approved space
temperature sensor, a Carrier accessory Thermidistat™ device, or a
Carrier-approved accessory thermostat. Refer to unit price pages
for reference. Install the temperature 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 temperature. Carrier space temperature sensor wiring
connections are shown in Fig. 14. General thermostat field control
wiring connections are shown in Fig. 13. Carrier Thermidistat
device wiring connections are shown in Fig. 15. Configuration of
the unit control is required to specify the control input type before
unit operation.
Route thermostat or space temperature sensor cable or equivalent
single leads of colored wire from subbase terminals through
conduit into unit to low-voltage connections as shown on unit label
wiring diagram and in Fig. 13-15.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) insulated wire (35_C minimum). For 50 to 75 ft, use
no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35_C minimum). All wire larger than
no. 18 AWG cannot be directly connected at the thermostat and
will require a junction box and splice at the thermostat.
Set heat anticipator settings as shown in Table 6.
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
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. 15. General humidistat wiring connections are
shown in Fig. 16. 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.
STAGES 1 AND 2
(W1 and W2) ON
Voltage
480 600 208/240 480 600
0.2 0.2 0.4 0.4 0.4
0.2 0.2 0.8 0.4 0.4
0.2 0.2 0.8 0.4 0.4
Units with the Humidi- -MiZer 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. 16.) 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. 16.) 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.
THERMIDISTAT
OC R Y1 Y2 W1
5 R Y2
Y1 W1
TB2
ROOFTOP UNIT
Fig. 15 --- Field Control Thermidistat Wiring
Fig. 16 --- Field Control Humidistat Wiring
Fig. 17 --- Third Party Smoke Detector Wiring
24
G DEHUM
W2 C
W2 C
G
1 2
HUMIDISTAT
C06295
C07045
C07191