Single Point Boxes And Supplementary Fuses - Carrier 50HCQA User Manual

Fig. 25 - - Typical Module Installation
Single Point Boxes and Supplementary Fuse
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 section (with electric heaters) from
the outdoor section. The Single Point Box has a hinged
access cover. See Fig. 26. The Single Point Box also
includes 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
connections.
TRACK
FLANGE
C08135
for details on tap
DEFROST
BOARD
E-HEAT
ORN
P3-3
BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 27 - - Accessory Electric Heater Control Connections
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 26 - - Typical Single Point Installation
All fuses on 50HCQ 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.)
Single Point Boxes without Fuses: Refer to accessory
heater and Single Point Box installation instructions for
details on tap connections.
Low- - Voltage Control Connections: Run 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 leads from Heater #1 and Heater #2 to terminal
TB4- - 1. Connect the BRN leads to terminal TB4- - 3. See
Fig. 27.
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
16
23 21
13 11
C09013
C08136