Single Point Boxes And Supplementary Fuses; Single Point Boxes Without Fuses; Low−Voltage Control Connections; Economi$Er X (Factory−Installed Option) - Carrier 50HCQ Installation Instructions Manual

Bare Heater Model Number
Heater Sales Package P/N
Includes:
Bare Heater
Carton and packing materials
Installation sheet
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 outdoor
section. The Single Point Box has a hinged access cover. See
Fig. 35. 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 for
details on tap connections.
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 35 − 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 —
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 —
Run the low−voltage control leads from the heater
module(s) − VIO and BRN (two of each if two modules
Table 7 – Heater Model Number
C R H E A
C R H E A
C14253
24
T E R 0
T E R 1
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. 36.
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. 36 − Accessory Electric Heater Control
Connections
EconoMi$er X (Factory−Installed Option)
For details on operating 50HCQ units equipped with the
factory−installed EconoMi$er
Factory−Installed Economizers for TC/TCQ/HC/HCQ/
LC/KC/KCQ Rooftop Units, 3 to 27.5 Nominal Tons.
Economizer Supplement Related to California Title 24.
Staged Air Volume (SAVt) with Variable
Frequency Drive (Factory−Installed Option)
For details on operating 50HCQ 2−stage cooling units
equipped with the factory−installed Staged Air Volume
option, refer to the Variable Frequency Drive (VFD)
Installation, Setup & Troubleshooting Supplement.
0 1 A/B 0 0
0 1 A/B 0 0
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
C09013
X option, refer to