Carrier 06D specifications Refrigerant Charging, Initial START-UP, Checking Operation

Refrigerant Charging

When charging, or when removing charge, circulate water through water-cooled condenser(s) and cooler continuously to prevent freezing. Freezing damage is considered abuse and is not covered by Carrier warranty.

EVACUATE, DEHYDRATE AND LEAK TEST — Entire re- frigerant system must be evacuated, dehydrated and leak tested by methods described in Carrier Standard Service Techniques Manual, Chapter 1, Sections 1-6 and 1-7. Use sight glass meth- od to charge system. See Section 1-8 of manual for details.

CHARGE THE SYSTEM — Charge to a clear sight glass while holding saturated condensing pressure constant at 125 F (air-cooled systems) or 105 F (water-cooled systems). Add additional refrigerant to fill condenser subcooler coils, where applicable, for air-cooled applications.

06D Compressor Units — See condenser data for additional charge required to fill subcooler after clear sight glass is obtained.

INITIAL START-UP

Do not attempt start-up with terminal cover removed. Bodily injury or death may result from explosion and/or fire if power is supplied to compressor with the terminal cover removed or unsecured. See warning label on termi- nal cover.

Crankcase heater should be energized a minimum of

24 hours before starting unit. Do not permit crankcase heaters to be deenergized during normal shutdown periods.

Check to see that oil level is 1/3 to 2/3 up on compressor sight glass.

Open water supply valve and allow water to reach condens- er. Open pressure line valve of water regulating valve, if used. (Turn condenser fan on when the compressor unit is applied with air-cooled condenser.)

Backseat (open) the compressor suction and discharge shut- off valves; open liquid line valve at receiver.

Start evaporator fan or chilled water pump.

To Start Compressor — Close main power switch, control power switch, and unit ON-OFF switch. Time Guard® control circuit causes a short delay before compressor starts.

Recheck oil level and check oil pressure. See Oil Charge for details.

With unit operating, voltage at compressor terminals must be within limits shown on nameplate. Phases must be balanced within 2% of voltage (refer to Electrical Connections section). Contact local power company for correction of improper line voltage or phase imbalance. Operation of unit on improper line voltage or with excessive phase imbalance constitutes abuse and is not covered by Carrier Warranty.

NOTE: The 06D, 07D unit safety controls are of the automatic-reset type. If compressor is shut off by a safety control, do not permit control to reset more than once before determining cause of shutdown.

CHECKING OPERATION

Refer to Carrier Standard Service Techniques Manual, Chapter 2 for complete instructions on checking electrical components.

Oil Charge (See Tables 2A and 2B) — Check oil level in compressor sight glass after 15 to 20 minutes of operation. If oil level is low, add oil according to methods described in Carrier Standard Service Techniques Manual, Chapter 1 (Section 1-11). Add oil through suction manifold connection on 4-cylinder compressors, and oil port on 6-cylinder compressors.

The preferred method for a complete recharge is to 1/2 sight glass with compressor shut down.

When additional oil, or a complete charge, is required, use only Carrier-approved compressor oil.

Approved* oils are:

Witco. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Suniso 3GS Texaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capella WF-32

*Oils approved for R-12, R-22, R-502 Carrier refrigerants. For other refrigerants, contact Carrier Factory Sales Representative.

IMPORTANT: Do not reuse drained oil and do not use oil that has been exposed to atmosphere.

High-Pressure Switch — Check by throttling condens- er water or blocking airflow on air-cooled units, allowing head pressure to rise gradually. Check discharge pressure constantly throughout procedure. Compressor should shut off within 10 psi of values shown in Table 3.

Low-Pressure Switch — Check by slowly closing suc- tion shutoff valve or by completely closing liquid line shutoff valve. A decrease of suction pressure will follow. Compressor should shut off within 4 psi of values shown in Table 3.

Oil Pressure Switch (OPS) — The oil pressure switch protects against damage from loss of oil or loss of oil pressure during unit start-up. If the oil pressure differential sensed by the OPS is 6 psig or less on unit start-up, the switch remains closed and the OPS heater is energized.

The switch time delay is approximately 45 seconds. If after

45 seconds the oil pressure differential sensed by the OPS is less than 11 psig, the heater remains energized. The OPS tem- perature actuated switch then opens and the compressor is deenergized. If the differential reaches 11 psig, the OPS opens and deenergizes the heater and the system operates normally.

IMPORTANT: If the oil pressure switch causes unit lock- out, determine and correct the cause of the lockout (such as loss of compressor oil or flooded compressor) before restarting the unit. Failure to correct the cause of OPS lock- out may constitute abuse. Equipment failure due to abuse is not covered by warranty.

To restart the unit, push the OPS reset button and then push the control circuit switch on the unit control box to OFF and then to ON.

Time Guard® Control — Control provides a delay of approximately 5 minutes before restarting compressor after shutdown for any reason. On starting, the Time Guard control timer causes a delay of 15 seconds after thermostat closes before compressor will start.

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