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Fig. 30 — Typical Module Installation
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 cab-
inet 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 3 for correlation between Heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs be-
tween the sales package part number (value is 1) and a bare
heater model number (value is 0).
BARE HEATER
C
MODEL NUMBER
Heater Sales Package
P/N includes:
Bare Heater
C
Carton and packing
materials
Installation sheet
TRACK
FLANGE
Table 3 — Heater Model Number
R
H
E
A
R
H
E
A
Single Point Boxes and Supplementary Fuses
When the unit MOCP device value exceeds 60-A, unit-
mounted 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 sec-
tion (with electric heaters) from the outdoor section. The
Single Point Box has a hinged access cover. See Fig. 31.
The Single Point Box also includes 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 instruc-
tions 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.)
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 31 — Typical Single Point Installation
T
E
R
0
T
E
R
1
18
0
1
A
0
0
1
A
0
0
0
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