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RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 22 - - Field Control Wiring Raceway
Electric Heaters
548J***A units may be equipped with field- - installed
accessory electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, line- - break limit
switches and a control contactor. One or two heater
modules may be used in a unit.
Heater modules are installed in the compartment below
the indoor (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. 23, Fig. 24 and Fig. 25.
Bare Heater Model Number
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
C08027
Table 2 – Heater Model Number
C
R
H
E
C
R
H
E
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. 24 - - Typical Component Location
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 23 - - Typical Access Panel Location
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
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1 or 3)
and a bare heater model number (value is 0).
A
T
E
R
0
A
T
E
R
1
SINGLE
CENTER
MANUAL RESET
POINT BOX
POST
LIMIT SWITCH
HEATER
COVERS
HEATER
HEATER
HEATER
MODULE
MODULE
MOUNTING
(LOCATION 1)
(LOCATION 2)
BRACKET
15
INDOOR
OUTDOOR
ACCESS
ACCESS PANEL
PANEL
C08133
0
1
A
0
0
0
1
A
0
0
C08134
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