Control And Power Wiring Diagrams - Carrier 50HCQ12 Installation Instructions Manual

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

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Installation instructions manual (40 pages)

Table of Contents

DISCONNECT

MOUNTING

LOCATION

Single Point Boxes

When heaters are installed, power wiring to both heaters and the

rest of the unit is connected via the single point box accessory,

which 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. 40. The single point box also in-

cludes 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. 40 — Typical Single Point Installation

SINGLE

POINT BOX

SINGLE POINT

BOX

MOUNTING

SCREW

Fig. 39 — Typical Component Location

Heater 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.

All fuses on 50HCQ 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.)

Heater Low-Voltage Control Connections

One or two heaters can be installed in the unit. Use the wiring pro-

cedure listed below for each heater as determined by the number

of stages in the heater.

Single Stage Heaters

Single-stage heaters will have an orange and a brown control wire.

Connect these to the orange and brown wires located on TB4.

Two Stage Heaters

Two-stage heaters will have orange, purple, red and brown wires.

The orange and the purple are the control wires and the red and

brown wires feed the safety circuit. Connect both the orange and

the purple wires to the orange wire locations of TB4. Connect the

red and brown wires to red and brown wires on TB4. If more than

one heater is installed, repeat the wiring procedure for the second

heater. The 3 locations across the top of TB4 do allow a switch to

be installed in series with some of the heaters in order to add addi-

tional heater control.

See Fig. 41 for additional details.