Carrier 50ZHA024-060 instruction manual Pre-Start-Up, Size

INDOOR

THERMOSTAT

RETURN

AIR

CONNECTING GROUND LEAD TO UNIT GROUND

Refer to Fig. 8 and 9. Connect the ground lead to the chassis using the unit ground in the control box.

ROUTING CONTROL POWER WIRES

TOP COVER

Power Wiring

Control Wiring

Condenser Airflow

Evaporator Airflow

POWER AND

LOW-VOLTAGE

ENTRY

COMPOSITE

RUST-PROOF

BASEPAN

CONDENSATE

DRAIN

CONNECTION

*Separate disconnect per NEC (National Electrical Code) required for electric heater when single- point conection is not used.

FROM

POWER

SOURCE

DISCONNECT PER NEC* (UNIT AND ELECTRIC HEATER)

C00008

Form a drip-loop with the thermostat leads before routing them into the unit. Route the thermostat leads through grommeted hole provided in unit into unit control box (See Fig. 7). Connect thermostat leads and unit power leads as shown in Fig. 9, 10A & 10B.

Route thermostat wires through grommet providing a drip-loop at the panel. Connect low-voltage leads to the thermostat as shown in Fig. 10A & 10B.

The unit transformer supplies 24-v power for complete system including accessory electrical heater. Transformer is factory wired for 230-v operation.

ACCESSORY ELECTRIC HEAT WIRING

C00008

Fig. 4—Typical installation

1” (25mm) MIN.

TRAP

OUTLET

2” (50mm) MIN.

C99013

Fig. 5—Condensate Trap (Using Tubing)

TRAP

OUTLET

1" min.

2" min.

C00009

Fig. 6—PVC Condensate Trap

Table 3—Minimum Airflow for Safe Electric Heater

Operation (CFM)

SIZE	024	030	036	042	048	060
Cfm	600	750	900	1050	1200	1500

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit component damage. Operation of unit on improper line voltage consti- tutes abuse and may cause unit damage that could affect warranty.

ROUTING POWER LEADS INTO UNIT

Use only copper wire between disconnect and unit. The high- voltage leads should be in a conduit until they enter the unit; conduit termination at the unit must be watertight. Run the high-voltage leads through the hole on the control box side of the unit (see Fig. 7 for location). When the leads are inside the unit, run leads to the control box (Fig. 8). For single-phase units, connect leads to the black and yellow wires (see Fig. 9).

Refer to accessory electric heat installation instructions for infor- mation on installing accessory electric heat. Accessory electric heat wiring is shown in Fig. 11A, 11B, & 11C.

PRE-START-UP

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD Failure to observe the following warnings could result in serious injury, death and/or property damage:

1.Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system.

2.Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

3.Do not remove compressor terminal cover until all electri- cal sources are disconnected and lockout tag is installed.

4.Relieve all pressure from both high- and low-pressure sides of the system before touching or disturbing anything inside terminal box if refrigerant leak is suspected around com- pressor terminals. Use accepted methods to recover refrig- erant.

5.Never attempt to repair soldered connection while refrig- erant system is under pressure.

6.Do not use torch to remove any component. System contains oil and refrigerant under pressure. To remove a component, wear protective goggles and proceed as fol- lows:

a.Shut off electrical power to unit and install lockout tag.

b.Relieve all refrigerant from system using both high- and low-pressure ports. Use accepted methods to recover refrigerant.

c.Cut component connecting tubing with tubing cutter and remove component from unit.

d.Carefully unsweat remaining tubing stubs when neces- sary. Oil can ignite when exposed to torch flame.

Use the Start-Up Checklist supplied at the end of this book and proceed as follows to inspect and prepare the unit for initial start-up:

1.Remove all access panels.

2.Read and follow instructions on all DANGER, WARNING, CAUTION, and INFORMATION labels attached to, or shipped with unit.

Make the following inspections:

a.Inspect for shipping and handling damages such as broken lines, loose parts, disconnected wires, etc.

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