Control And Power Wiring Diagrams - Carrier WeatherMaster 50HCQ 04 Series Installation Instructions Manual

Single package rooftop heat pump with puron (r-410a) refrigerant

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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. 39. 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 50HCQA units are 60-A. (Note that all heaters are

qualified for use with a 60-A fuse, regardless of actual heater am-

pacity, so only 60-A fuses are necessary.)

Single Point Boxes without Fuses

Refer to accessory heater and single point box installation instruc-

tions 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. 39 — Typical Single Point Installation

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. 40.

DEFROST

BOARD

E-HEAT

ORN

P3-3

BRN

ORN

TB4

VIO

Field

Connections

Fig. 40 — Accessory Electric Heater Control