Bryant 581J series, Installation Instructions Manual

Page: 21 / 44

21
Factory−Option Thru−Base Connections
(Electrical Connections) —
This service connection kit consists of a
1
/
2
−in electrical
bulkhead connector and a 1
1
/
4
−in electrical bulkhead
connector, all factory−installed in the embossed (raised)
section of the unit basepan in the condenser section. The
1
/
2
−in bulkhead connector enables the low−voltage control
wires to pass through the basepan. The 1
1
/
4
−in electrical
bulkhead connector allows the high−voltage power wires
to pass through the basepan. See Fig. 16.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field−supplied and field−installed liquidtight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24−v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
Units without Thru−Base Connections —
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 24.
Field Control Wiring —
The 581J unit requires an external temperature control
device. This device can be thermostat (field−supplied), a
thermostat emulation device provided as part of a
third−party Building Management System or the
factory−installed RTU Open controller option.
Thermostat —
Install a Bryant−approved accessory 2−stage thermostat
according to installation instructions included with the
accessory. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24−v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24−v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35
_
C minimum).
For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated
wire (35
_
C minimum). For over 75 ft. (23 m), use no. 14
AWG insulated wire (35
_
C minimum). All wire sizes
larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice
at the thermostat.
Typical
Thermostat
Connections
Central
Terminal
Board
W1
Y2
Y1
R
W2
G
C
X
W1
Y2
Y1
R
W2
G
C
X
T–STAT
C
W2
G
W1
O/B/Y2
R
Y1
(see Note)
Note : Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2.
Field Wiring
C09350
Fig. 31 − Typical Low−Voltage Control Connections
Unit without Thru−Base Connection Kit —
Pass the thermostat control wires through the hole
provided in the end panel (see item “D” in the view
labeled “LEFT” in Fig. 2 or Fig. 3); then feed the wires
through the raceway built into the corner post to the
control box. Pull the wires over to the terminal strip on the
upper−left corner of the Central Terminal Board (CTB).
See Fig. 32.
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 32 − Field Control Wiring Raceway
NOTE: If thru−the−bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
581J