Bryant 548J*14D Factory-Option Thru-Base Connections, Thermostat, Field Control Wiring

Factory-Option Thru-Base Connections —

This service connection kit consists of a 1/2-in electrical bulkhead connector and a 1 1/2-in electrical bulkhead connector, all factory-installed to the basepan cover plate. Remove the cover plate from the shipping bracket and attach to basepan with 8 screws provided. The 1/2-in bulkhead connector enables the low-voltage control wires to pass through the basepan. The 1 1/2-in electrical bulkhead connector allows the high-voltage power wires to pass through the basepan. See Fig. 26.

Check tightness of connector lock nuts before connecting electrical conduits.

LOW VOLTAGE

CONDUIT

CONNECTOR

HIGH VOLTAGE

CONDUIT

CONNECTOR

Thermostat —

Install a Bryant-approved accessory 2 stage Cooling/Heating thermostat according to installation instructions included with the accessory. The 548J*14D models do not require a thermostat with an O function to control the reversing valve operation. If using an electronic thermostat, configure it for “non-heat pump” operation. 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.

548J*14D

C10017

Fig. 26 - Thru-Base Connection Fittings

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 wires 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). Remove one of the two knockouts located on the bottom left side of the unit control box. Use this hole for the control conduit.

Units without Thru-Base Connections —

1. Install power wiring conduit through side panel open-

Typical

Thermostat

Connections

C

G

W2

(Note 2)

W1

O/B/Y2

(Note 1)

Y1

Central

Terminal

Board

X

C

T

GH E

W2	R
	M
	O
W1
	S
	T
Y2
	A
	T
Y1

ings. Install conduit between disconnect and control

box.

2. Install power lines to terminal connections as shown

in Fig. 22.

Field Control Wiring —

The 548J*14D unit requires an external temperature control device. This device can be a thermostat emulation device provided as part of a third-party Building Management System.

R R

Note 1: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.

Note 2: W2 connection not required on units without electric heating.

Field Wiring

C09012

Fig. 27 - Typical Low-Voltage Control Connections

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