Bryant 548J A Series Installation Instructions Manual page 21

SEN
SEN
Jumper
SET
SET
Fig. 35 - - RTU- - MP T- - 56 Sensor Connections
Connect T- - 59 - - The T- - 59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 36
for internal connections at the T- - 59. Connect the SEN
terminal (BLU) to RTU- - MP J20- - 1. Connect the COM
terminal (BRN) to J20- - 2. Connect the SET terminal (STO
or BLK) to J20- - 3.
BRN (COM)
BLK (STO)
BLU (SPT)
OR SET SEN
OPB COM- PWR+
NOTE: Must use a separate isolated transformer.
Fig. 36 - - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Economizer controls —
Outdoor Air Enthalpy Control (PNO 33CSENTHSW) - -
The enthalpy control (33CSENTHSW) is available as a
field- - installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field- - installed
accessory return air enthalpy sensor (33CSENTSEN) is
required for differential enthalpy control. See Fig. 37.)
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled "ESL" to the
terminal labeled "LOW". See Fig. 37. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
J20-1
J20-2
J20-3
C08461
SENSOR
WIRING
POWER
WIRING
24 VAC
C07132
Enthalpy
Switch
24V
GND
LOW
Fig. 37 - - Enthalpy Switch (33CSENTHSW) Connections
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control — Differential enthalpy
control is provided by sensing and comparing the outside
air and return air enthalpy conditions. Install the outdoor
air enthalpy control as described above. Add and install a
return air enthalpy sensor.
Return Air Enthalpy Sensor — Mount the return- - air
enthalpy sensor (33CSENTSEN) in the return- - air section
of the economizer. The return air sensor is wired to the
enthalpy controller (33CSENTHSW). See Fig. 38.
24V
– 4-20
Main
GND
+ VDC
Out
LOW
+ 24-36
VDC In
– 4-20 Main
Out
Fig. 38 - - Outside and Return Air Enthalpy Sensor
Wiring
To wire the return air enthalpy sensor, perform the
following:
1. Use a 2- - conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. Connect the field- - supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (- - ) spade connector on the return air en-
thalpy sensor and the (- - ) terminal on the enthalpy
controller.
21
RED
ECONO
MOTOR
BLK
CTB
GRA 7
ESL
ECON
Factory Wiring Harness
C09026
RED
ECONO
MOTOR
BLK
GRA
ESL
C09027