Low- - Voltage Control Connections; Low Ambient Control (Factory Option); Variable Frequency Drive (Vfd) 2- - Speed Indoor Fan Motor System (Factory- - Installed); Perfect Humidityt System Control Connections - Bryant 551J*07A/G Series Installation Instructions Manual

Low- - Voltage Control Connections —
Pull the low- - voltage control leads from the heater
module(s) - - VIO and BRN (two of each if two modules
are installed; identify for Module #1) - - to the 4- - pole
terminal board TB4 located on the heater bulkhead to the
left of Heater #1. Connect the VIO lead from Heater #1 to
terminal TB4- - 1. For 2 stage heating, connect the VIO
lead from Heater #2 to terminal TB4- - 2. For 1 stage
heating with 2 heater modules connect the VIO lead from
both Heater #1 and #2 to terminal TB4- - 1. Connect both
BRN leads to terminal TB4- - 3. See Fig. 31.
CTB
CONTL
BOARD
2
VIO
3
ORN
12
BRN
ORN
1
TB4
VIO
Field
Connections
for Field-Installed
Electric Heat
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 31 - - Optional or Accessory Electric Heater
Control Connections (2- - Stage heating Shown)

Low Ambient Control (Factory Option)

If the unit comes with Electro- - Mechanical (EM) control,
then no adjustment is necessary.
If the unit comes with the RTU Open controller option,
then refer to its installation control manual for details on
adjusting "Cooling Lock- - Out" setting and configure for
your specific job requirements.
Variable Frequency Drive (VFD) 2- -Speed Indoor
Fan Motor System (Factory- -Installed Option)
For details on operating 551J 2 stage cooling units
equipped with the factory- - installed Variable Frequency
Drive (VFD) 2- - Speed Indoor Fan Motor System option,
refer to the Variable Frequency Drive (VFD) Installation,
Setup and Troubleshooting Supplement.
VIO BRN
2 3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
C12106

Perfect Humidityt System Control Connections

Perfect Humidity – Space RH Controller —
NOTE: Perfect Humidity dehumidification system is a
factory- - installed option which is only available for units
equipped with belt- - drive motors.
The Perfect Humidity dehumidification system requires a
field- - supplied and installed space relative humidity
control device. This device may be a separate humidistat
control (contact closes on rise in space RH above control
setpoint) or a combination thermostat- - humidistat control
device with isolated contact set for dehumidification
control. The humidistat is normally used in applications
where a temperature control is already provided (such as a
third- - party Building Management System).
To connect a field- - supplied humidistat:
1. Route the humidistat 2- - conductor cable (field- - sup-
plied) through the hole provided in the unit corner
post.
2. Feed wires through the raceway built into the corner
post (see Fig. 26 on page 19) to the 24- - v barrier lo-
cated on the left side of the control box. The raceway
provides the UL- - required clearance between high- -
voltage and low- - voltage wiring.
3. Use wire nuts to connect humidistat cable to the leads
in the low–voltage wiring (as shown in Fig. 32 on
page 22), connecting PNK to PNK and PNK/BLK to
PNK/BLK. Refer to the instructions for the
field- - supplied humidistat for more information.
To connect a field- - installed programmable thermidistat:
1. Route the programmable thermidistat multi- - conductor
cable (field- - supplied) through the hole provided in the
unit corner post.
2. Feed wires through the raceway build into the corner
post (see Fig. 26) to the 24- - v barrier located on the
left side of the control box. The raceway provides the
UL- - required clearance between high- - voltage and
low- - voltage wiring.
3. The programmable thermostat has dry contacts at
terminals D1 and D2 for dehumidification operation
(see Fig. 33 on page 22). The dry contacts must be
wired between CTB terminal R and the PNK/BLK
lead to the LTLO switch with field- - supplied wire
nuts. Refer to the installation instructions included
with the programmable thermidistat device for more
information.
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