Alarm Output; Outdoor Enthalphy; Iaq Switch; Iaq Sensor - Carrier 48PG03-16 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

For 48 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
S PL 19-5 = 24 VAC signal for Fire Shutdown
S PL 19-4 = 24 VAC power for indoor fan contactor
control circuit
NOTE: If the indoor fan must be shut down without any delay
upon Fire Shutdown input, then the factory jumper between
PL19-3 and PL19-4 must be replaced with a normally closed
contact when there is no alarm (open with alarm).

Alarm Output

The alarm output is provided on the field connection terminal
board (TB1) to indicate a current alarm status. The output will be
24VAC if a current alarm exists.
S C = 24 VAC common
S X = 24 VAC signal output

Outdoor Enthalphy

For units with the economizer option or accessory and the ECB
control board, the outdoor enthalpy input is provided on the field
connection terminal board (TB1). The Enthalpy Switch
configuration, Configuration→ECON→EN.SW, identifies the
normally open or normally closed status of this input when the
outdoor enthalpy is low.
S 6 = 24 VAC source for dry contact
S 7 = 24 VAC signal input

IAQ Switch

For units with the economizer option or accessory and the ECB
control board, the IAQ switch input is provided on the field
connection terminal board (TB1). The IAQ Switch Input
configuration, Configuration→AIR.Q →II.CF, identifies the
normally open or normally closed status of this input when the
indoor air quality value is low (good) and also selects the unit
response to this input.
S 6 = 24 VAC source for dry contact
S 7 = 24 VAC signal input
NOTE: An IAQ switch cannot be used if an enthalpy switch is
already on this input.
Fig. 7 --- 48/50PG Humidi- -MiZer Third Party Smoke Detector Wiring

IAQ Sensor

For units with the economizer option or accessory and the ECB
control board, the IAQ sensor input is provided on the field
connection terminal board (TB1). The IAQ Analog Input
configuration, Configuration→AIR.Q →IA.CF selects the unit
response to this input. Default conversion to 0 to 2000 ppm can
be changed in the configurations.
S 2 = 4-20 mA + signal
S 3 = 4-20 mA – common

OAQ Sensor

For units with the economizer option or accessory and the ECB
control board, the OAQ sensor input is provided on the field
connection terminal board (TB1). The OAQ Analog Input
configuration, Configuration→AIR.Q →OA.CF selects the unit
response to this input. Default conversion to 0 to 2000 ppm can
be changed in the configurations.
S 3 = 4-20 mA – common
S 4 = 4-20 mA + signal

Economizer Monitoring

On field terminal board (TB1), terminals 8, 9, and 10 can be used
to monitor economizer position from a third party control system.
See economizer operation section for additional information.
In digital mode (E.CTL = 1 or 2), the economizer commanded
position or actual position can be read as a 2- -10v or 4- -20mA
signal. TB1- -8 and TB1- -9 are used as follows:
S To read a 2- -10v signal, disconnect the violet wire on
TB1- -J10- -8 and place volt meter device across TB1- -8
and TB1- -9.
S To read a 4- -20mA signal, disconnect the violet wire on
TB1- -J10- -8 and the 500Ω resister at TB1- -J10- -6.
Place amp meter device between TB1- -8 and TB1- -9.
In analog mode (E.CTL = 3), the economizer position can be read
as a 2- -10v feedback signal across TB1- -10 and TB1- -9 at any
time.
NOTE: The violet wire and 500Ω resister must be connected at
the J10 connector as originally wired to operate the economizer in
analog mode.
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