Bryant 548J Service And Maintenance Instructions page 38

SEN
SEN
Fig. 52 - - RTU- - MP T- - 55 Sensor Connections
Connect T- - 56 - - See Fig. 53 for T- - 56 internal
connections. Install a jumper between SEN and SET
terminals as illustrated. Connect T- - 56 terminals to
RTU- - MP J20- - 1, J20- - 2 and J20- - 3 per Fig. 54.
1 2 4 5 6
3
WHT(GND)
SET
SEN
SW1
BRN (GND)
BLU (SPT)
Cool Warm
Fig. 53 - - T- - 56 Internal Connections
SEN
SEN
Jumper
SET
SET
Fig. 54 - - 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. 55
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.
J20-1
J20-2
C08460
RED(+)
CCN COM
BLK(-)
BLK
(T56)
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
C08202
J20-1
J20-2
J20-3
C08461
BRN (COM)
BLK (STO)
BLU (SPT)
OR SET SEN
OPB COM- PWR+
NOTE: Must use a separate isolated transformer.
Fig. 55 - - 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 "Return Air
Enthalpy Sensor" for details.)
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. 56. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
Enthalpy
Switch
24V
GND
LOW
Fig. 56 - - Enthalpy Switch (33CSENTHSW) Connections
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
The enthalpy control receives the outdoor air enthalpy
from the outdoor air enthalpy sensor and provides a dry
contact switch input to the RTU- - MP controller. A closed
contact indicates that outside air is preferred to the return
air. An open contact indicates that the economizer should
remain at minimum position.
38
SENSOR
WIRING
POWER
WIRING
24 VAC
C07132
RED
ECONO
MOTOR
BLK
CTB
GRA 7
ESL
ECON
Factory Wiring Harness
C09026