Carrier 19XL specifications Before Initial START-UP, Job Data Required, Equipment Required

Safety Shutdown Ð A safety shutdown is identical to a manual shutdown with the exception that the LID will dis- play the reason for the shutdown, the alarm light will blink continuously, and the spare alarm contacts will be ener-

gized. A safety shutdown requires that the RESET softkey

be pressed in order to clear the alarm. If the alarm is still present, the alarm light will continue to blink. Once the alarm

is cleared, the operator must press the CCN or LOCAL softkeys to restart the chiller.

Do not reset starter loads or any other starter safety for 30 seconds after the compressor has stopped. Voltage output to the compressor start signal is maintained for 10 seconds to determine starter fault.

BEFORE INITIAL START-UP

Job Data Required

·list of applicable design temperatures and pressures (pro- duct data submittal)

·chiller certi®ed prints

·starting equipment details and wiring diagrams

·diagrams and instructions for special controls or options

·19XL Installation Instructions

·pumpout unit instructions

Equipment Required

·mechanic's tools (refrigeration)

·digital volt-ohmmeter (DVM)

·clamp-on ammeter

·electronic leak detector

·absolute pressure manometer or wet-bulb vacuum indica- tor (Fig. 25)

·500 v insulation tester (megohmmeter) for compressor motors with nameplate voltage of 600 v or less, or a 5000-v insulation tester for compressor motor rated above 600 v

Fig. 25 Ð Typical Wet-Bulb Type

Vacuum Indicator

Using the Optional Storage Tank and Pumpout

System Ð Refer to Pumpout and Refrigerant Transfer Procedures section, page 59 for: pumpout system prepara- tion, refrigerant transfer, and chiller evacuation.

Remove Shipping Packaging Ð Remove any packaging material from the control center, power panel, guide vane actuator, motor cooling and oil reclaim solenoids, motor and bearing temperature sensor covers, and the factory- mounted starter.

Open Oil Circuit Valves Ð Check that the oil ®lter isolation valves (Fig. 4) are open by removing the valve cap and checking the valve stem.

Tighten All Gasketed Joints and Guide Vane Shaft Packing Ð Gaskets and packing normally relax by the time the chiller arrives at the jobsite. Tighten all gasketed joints and guide vane shaft packing to ensure a leak- tight chiller.

Check Chiller Tightness Ð Figure 26 outlines the proper sequence and procedures for leak testing.

19XL chillers are shipped with the refrigerant contained in the condenser shell and the oil charge shipped in the compressor. The cooler will have a 15 psig (103 kPa) refrigerant charge. Units may be ordered with the refrigerant shipped separately, along with a 15 psig (103 kPa) nitrogen- holding charge in each vessel. To determine if there are any leaks, the chiller should be charged with refrigerant. Use an electronic leak detector to check all ¯anges and solder joints after the chiller is pressurized. If any leaks are detected, fol- low the leak test procedure.

If the chiller is spring isolated, keep all springs blocked in both directions in order to prevent possible piping stress and damage during the transfer of refrigerant from vessel to vessel during the leak test process, or any time refrigerant is transferred. Adjust the springs when the refrigerant is in operating condition, and when the water circuits are full.

Refrigerant Tracer Ð Carrier recommends the use of an environmentally acceptable refrigerant tracer for leak test- ing with an electronic detector or halide torch.

Ultrasonic leak detectors also can be used if the chiller is under pressure.

Do not use air or oxygen as a means of pressurizing the chiller. Some mixtures of HCFC-22 or HFC-134a and air can undergo combustion.

Leak Test Chiller Ð Due to regulations regarding refrigerant emissions and the difficulties associated with sepa- rating contaminants from refrigerant, Carrier recommends the following leak test procedures. See Fig. 26 for an outline of the leak test procedures. Refer to Fig. 27 and 28 during pumpout procedures and Tables 5A, B, C, and D for refrig- erant pressure/temperature values.

1.If the pressure readings are normal for chiller condition:

a.Evacuate the holding charge from the vessels, if present.

b.Raise the chiller pressure, if necessary, by adding re- frigerant until pressure is at equivalent saturated pres- sure for the surrounding temperature. Follow the pumpout

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