Third Party Control; Thermostat; Thermidistat; Humidistat - Carrier 48PG03-16 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

THIRD PARTY CONTROL

Third party controls may
ComfortLink™ controls through the connections described
below. See other sections of these instructions for more
information on the related unit control configurations.

Thermostat

The thermostat inputs are provided on the field connection
terminal board (TB1). The
configuration, Configuration→UNIT→T.CTL, selects the unit
response to these inputs.
Y1 = first stage cooling
Y2 = second stage cooling
W1 = first stage heating
W2 = second stage heating
G = indoor fan

Thermidistat

The thermidistat inputs are provided on the field connection
terminal board (TB1). (See Fig. 5.)
thermostat and humidistat combined. The thermostat control type
configuration, Configuration→UNIT→T.CTL, selects the unit
response to the thermostat inputs above. The space humidity
Configuration→UNIT→RH.SW,
switch configuration,
identifies the normally open or normally closed status of this
input at LOW humidity, and the input is:
TB1 Humidistat 1 = 24VAC signal input
THERMIDISTAT
OC R Y1 Y2 W1
5 R Y2 W2
Y1 W1
TB1
ROOFTOP UNIT
Fig. 5 --- Field Control Thermidistat Wiring

Humidistat

For units with the factory Humidi-MiZer option, the humidistat
input is provided on the field connection terminal board (TB1).
(See Fig. 6.) The Space Humidity Switch configuration,
Configuration→UNIT→RH.SW, identifies the normally open or
normally closed status of this input at high humidity.
Fig. 6 --- Humidi- -MiZer Low- -Voltage Terminal Strip- -Humidity Sensor/Humidistat Wiring
interface with the unit
Thermostat Control Type
The Thermidistat is a
W2 G C DEHUM
C
G
1
2
HUMIDISTAT
C07055
S Humidistat 1 = 24 VAC source for dry contact
S Humidistat 2 = 24 VAC signal input
NOTE: On units with Humidi- -MiZer, the TB1 Humidistat
terminals 1 and 2 are the same as the TB1 Fire Shutdown
terminals 1 and 2 on a standard unit. See Fire Shutdown section.

Humidity Sensor

For units with the factory Humidi-MiZer option and the
economizer option with the ECB (economizer control board), the
humidity sensor input is provided on the field connection
terminal board (TB1). (See Fig. 6.) The sensor can be used
instead of a humidistat or Thermidistat. The RH Sensor on OAQ
Input configuration, Configuration→UNIT→RH.S=YES,
identifies the sensor use. Default conversion to 0 to 100% relative
humidity can be changed in the configurations.
S 4 = 4-20 mA + signal input
S 3 = 4-20 mA – common

Remote Occupancy

The remote occupancy input is provided on the field connection
terminal board (TB1). The Remote Occupancy Switch
configuration, Configuration →UNIT→RM.SW, identifies the
normally open or normally closed status of this input when
unoccupied.
S 5 = 24 VAC signal input
S 6 = 24 VAC source for dry contact

Fire Shutdown

The fire shutdown input is provided for unit shutdown in
response to a fire alarm or smoke detector. The Fire Shutdown
Configuration
Switch configuration,
identifies the normally open or normally closed status of this
input when there is no fire alarm.
For 48/50 units without Humidi-MiZer system, input at field
connection terminal board (TB1)
S Fire Shutdown 1 = 24 VAC source for dry contact
S Fire Shutdown 2 = 24 VAC signal input
For 50 series units with Humidi-MiZer system, input at wire
harness plug 19 (PL 19). (See Fig. 7.)
S PL 19-3 = 24 VAC source for dry contact
PL 19-5 = 24 VAC signal input
S
58
→UNIT→FS.SW,
C07045