Carrier 50HC Series, Installation Instructions Manual, Page: 21 / 52

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Fig. 37 — Typical Access Panel Location (3-5 Ton)
Fig. 38 — Typical Component Location
Fig. 39 — Typical Module Installation
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 dis-
tribution and fuse blocks. The single point box will be installed di-
rectly under the unit control box, just to the left of the partition
separating the indoor section (with electric heaters) from the out-
door section. The single point box has a hinged access cover. See
Fig. 40. 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 instructions for details on tap con-
nections on the field-installed electric heat accessory.
All fuses on 50HC units are 60-A. (Note that all heaters are quali-
fied for use with a 60-A fuse, regardless of actual heater ampacity,
so only 60-A fuses are necessary.)
Fig. 40 — Typical Single Point Installation
Low-Voltage Control Connections
All units except size 06, 575V:
Pull the low-voltage control leads from the heater module(s) —
VIO and BRN (two of each if two modules are installed; identify
for Module #1) — to the 4-pole terminal board TB4 located on the
heater bulkhead to the left of Heater #1. Connect the VIO lead
from Heater #1 to terminal TB4-1. For 2 stage heating, connect
the VIO lead from Heater #2 to terminal TB4-2. For 1 stage heat-
ing with 2 heater modules, connect the VIO lead from both Heater
#1 and #2 to terminal TB4-1. Connect both BRN leads to terminal
TB4-3. See Fig. 41.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL OUTDOOR
ACCESS PANEL
INDOOR
ACCESS
PANEL
DISCONNECT
MOUNTING
LOCATION EMT OR RIGID CONDUIT
(FIELD-SUPPLIED) SINGLE
POINT BOX CENTER
POST
HEATER
COVERS
HEATER
MOUNTING
BRACKET HEATER
MODULE
(LOCATION 2) HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
BRACKET AND
CONDUIT
DRIP BOOT MAIN
CONTROL
BOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESET
LIMIT SWITCH
TRACK
FLANGE
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
11
13
21
23
OD
22.2
3
1
23
ISTED AIR NDITIONING
UIP ACCESS
346N
.
P / N 2- 5610-4
REV
1 1
1
3
2
1
2
3
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
FOAM
BUSHING
DRIP BOOT
BRACKET
MOUNTING
SCREWS
HEATER
RELAYS
POWER
WIRES
HEATER
MOUNTING
SCREWS