Carrier 50ZHA024-060 UnitElectrical Connection, ControlBox Wiring, LinePower Connections

HIGH-VOLTAGE POWER	LOW-VOLTAGE WIRING
WIRING ENTRY HOLE	ENTRY HOLE

A05198

Fig. 7—Unit Electrical Connection

C00011

Fig. 8—Control Box Wiring

START-UP

Use the Start-Up Checklist supplied at the end of this book and proceed as follows:

Step 1—Check for Refrigerant Leaks

LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS:

1.Using both high- and low-pressure ports, locate leaks and reclaim remaining refrigerant to relieve system pressure.

2.Repair leak following accepted practices.

Step 2—Start-Up Cooling Section and Make Adjustments

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit component damage.

Complete the required procedures given in the Pre-Start- Up section this page before starting the unit. Do not jumper any safety devices when operating the unit.

Do not operate the compressor in cooling mode when the outdoor temperature is below 40 F.

Do not rapid-cycle the compressor. Allow 5 minutes between ‘‘on’’ cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling control operation as follows:

1.Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down within 60 seconds (for 024-042) or 90 seconds (for 048 and 060) when FAN switch is placed in AUTO position.

2.Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room temperature. Observe that compressor, outdoor fan, and indoor blower motors start and that reversing valve shifts. Observe that cooling cycle shuts down when control setting is satisfied. Reversing valve (RV) remains energized.

3.Place system switch in HEAT position. Observe that compres- sor, indoor fan and outdoor fan energize (Reversing Valve is deenergized in heat pump heating mode). Set control above room temperature. Observe that heating cycle shuts down when control setting is satisfied.

4.When using an automatic changeover room thermostat, place both SYSTEM and FAN switches in AUTO. positions. Observe that unit operates in Cooling mode when temperature control is set to ‘‘call for cooling’’ (below room temperature), and unit operates in Heating mode when temperature control is set to “call for heating” (above room temperature).

Step 3—Refrigerant Charge

Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 2. Refer to Carrier Refrigerant Service Techniques Manual, Refrigerants section. Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of 15 minutes before checking charge.

NO CHARGE

Refer to Carrier Refrigerant Service Techniques. Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to Table 2).

			UNIT GROUND
			GROUND
			LEAD
	SINGLE-PHASE	L	BLK
3-PHASE	CONNECTIONS
CONNECTIONS	TO DISCONNECT	L	YEL
TO DISCONNECT	PER NEC
PER NEC		L	BLU

NOTE: Install a liquid-line filter drier whenever the system has been opened for repair.

Fig. 9—Line Power Connections

C00012

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