Carrier WeatherMaker 50FCQ 14 Series Installation Instructions Manual page 20

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 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 Small Roof Top
Units Accessory Electric Heater and single point box installation
instructions for details on tap connections.
All fuses on 50FCQ units are 60-A. (Note that all heaters are qual-
ified for use with a 60-A fuse, regardless of actual heater ampacity,
so only 60-A fuses are necessary.)
SINGLE POINT BOXES WITHOUT FUSES
Unit heater applications not requiring supplemental fuses require a
special single point box without any fuses. The accessory single
point boxes contain 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 accessory heater and single point box
installation instructions for details on tap connections.
LOW-VOLTAGE CONTROL CONNECTIONS
Pull the low-voltage control leads from the heater module —
WHT, VIO and BRN to the 4-pole terminal board TB4 located on
the heater bulkhead to the left of the Heater module. Connect the
WHT lead from Heater circuit #1 to terminal TB4-1. For 2 stage
heating, connect the VIO lead from Heater circuit #2 to terminal
TB4-2. Connect the BRN lead(s) to terminal TB4-3. See Fig. 39.
Fig. 40 — Typical Single Point Installation
20
Fig. 39 — Accessory Electric Heater Control
Connections
CONTROL AND POWER WIRING DIAGRAMS
Figures 41-44 are typical control and power wiring diagrams.