Carrier Compressor and Condensing Unit specifications Electrical Connections

Piping Connections — Attach water supply and return lines to connections indicated on condensing unit (Fig. 2). Water leaving condenser should not be connected directly into sewer lines; check local codes.

Attach refrigerant liquid and suction lines to condensing unit (Fig. 2); suction and discharge lines to compressor unit (Fig. 3 and 4). Discharge line muffler and check valve are factory supplied with 06E compressor units. Install the muffler as close to shutoff valve as possible and install the check valve in the discharge line close to the muffler, on the downstream side. When soldering or brazing piping to valves, disassemble the valve or wrap it in wet cloth to prevent damage by heat. Allow flexibility in suction line so compressor suction valve may be moved aside for access to suction strainer.

A solenoid valve is necessary for single pumpout control used on 06E and 07E units. Install the valve (field supplied) in the liquid line, just before expansion valve. A filter drier of adequate size should be installed in liquid line between con- denser and solenoid valve.

Pressure relief valve located on top of condenser will open to relieve excessive pressure, allowing refrigerant to escape. Most local codes require piping from valve to outdoors.

Refer to Carrier System Design Manual for standard piping techniques.

Electrical Connections

UNBALANCED 3-PHASE SUPPLY VOLTAGE — Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the % voltage imbalance:

% Voltage Imbalance =

100 x	max voltage deviation from avg voltage
	average voltage

Example: Supply voltage is 240-3-60

AB = 243 volts

BC = 236 volts

AC = 238 volts

243 + 236 + 238

Average Voltage =

3

717 = 3

= 239 volts

Determine maximum deviation from average voltage:

(AB) 243 – 239 = 4 volts (BC) 239 – 236 = 3 volts (AC) 239 – 238 = 1 volt

Maximum deviation is 4 volts. Determine % voltage imbalance:

% Voltage Imbalance = 100 x 2394 = 1.7%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately. Allowing the unit to operate with a voltage imbalance in excess of 2% may void the warranty.

POWER SUPPLY — Field wiring must comply with local and national codes. See Table 1.

Install a branch circuit fused disconnect of adequate size to handle starting current. The disconnect must be within sight from the unit and readily accessible, in compliance with National Electrical Code (NEC), Section 440-14.

Line power is brought into control center through indicated opening. Connect line power supply to terminal block TB1; connect power leads to terminals L1, L2 and L3. Connect control circuit power supply (115 volts) to terminals 1 and 15 on terminal block TB2. Refer to Fig. 5.

Wiring connections for field-supplied equipment are shown on wiring diagram. See Fig. 5.

ACCESSORIES — Field-installed accessories for the 06E and 07E units are control circuit transformer and gage panel (3 gages). Refer to accessory literature for installa- tion instructions.

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