Heat Anticipator Settings; Electric Heaters - Bryant Preferred Series Installation Instructions Manual

RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 33 — Field Control Wiring Raceway

HEAT ANTICIPATOR SETTINGS

Set heat anticipator settings at 0.14 amp for the first stage and
0.14 amp for second-stage heating, when available.

ELECTRIC HEATERS

The 551J units may be equipped with factory or field-installed
electric heaters. The heaters are modular in design, with heater
frames holding open coil resistance wires strung through ce-
ramic insulators, line-break limit switches and a control con-
tactor. One or two heater modules may be used in a unit.
Heater modules are installed in the compartment below the in-
door (supply) fan outlet. Access is through the indoor access
panel. Heater modules slide into the compartment on tracks
along the bottom of the heater opening. See Fig. 34-36.
Not all available heater modules may be used in every unit.
Use only those heater modules that are UL listed for use in a
specific size unit. Refer to the label on the unit cabinet for the
list of approved heaters.
Unit heaters are marked with heater model numbers, but acces-
sory heaters are ordered as and shipped in cartons marked with
a corresponding heater sales package part number.
NOTE: The value in position 9 of the part number differs between
the sales package part number (value is 1) and a bare heater model
number (value is 0).
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 34 — Typical Access Panel Location (3-5 Ton)
INDOOR
OUTDOOR
ACCESS
ACCESS PANEL PANEL
DISCONNECT EMT OR RIGID CONDUIT
MOUNTING (FIELD-SUPPLIED)
LOCATION
SINGLE POINT
MAIN BRACKET AND BOX
CONTROL CONDUIT MOUNTING
BOX DRIP BOOT SCREW
CONTROL WIRE TERMINAL BLOCK
Fig. 35 — Typical Component Location
Fig. 36 — Typical Module Installation
Single Point Boxes and Supplementary Fuses
When the unit MOCP device value exceeds 60-A, unit-mount-
ed supplementary fuses are required for each heater circuit.
These fuses are included in accessory single point boxes, with
power distribution and fuse blocks. The single point box will
be installed directly under the unit control box, just to the left
of the partition separating the indoor section (with electric
heaters) from the outdoor section. The single point box has a
hinged access cover. See Fig. 37. The single point box also in-
cludes a set of power taps and pigtails to complete the wiring
between the single point box and the unit's main control box
terminals. Refer to the accessory heater and single point box
installation instructions for details on tap connections on the
field-installed electric heat accessory.
All fuses on 551J units are 60-A. (Note that all heaters are
qualified for use with a 60-A fuse, regardless of actual heater
ampacity, so only 60-A fuses are necessary.)
20
SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER
COVERS
HEATER HEATER HEATER
MODULE MODULE MOUNTING
(LOCATION 1) (LOCATION 2) BRACKET
TRACK
FLANGE