Carrier 19XR, XRV specifications Check Starter

2.On low-voltage compressors (600 v or less) connect a voltmeter across the power wires to the compressor start- er and measure the voltage. Compare this reading to the voltage rating on the compressor and starter nameplates.

3.Compare the ampere rating on the starter nameplate to rating on the compressor nameplate. The overload trip amps must be 108% to 120% of the rated load amps.

4.The starter for a centrifugal compressor motor must contain the components and terminals required for PIC II refrigeration control. Check the certified drawings.

5.Check the voltage to the following components and compare it to the nameplate values: oil pump contact, pumpout compressor starter, and power panel.

6.Ensure that fused disconnects or circuit breakers have been supplied for the oil pump, power panel, and pumpout unit.

7.Ensure all electrical equipment and controls are properly grounded in accordance with job drawings, certified drawings, and all applicable electrical codes.

8.Ensure the customer’s contractor has verified proper op- eration of the pumps, cooling tower fans, and associated auxiliary equipment. This includes ensuring motors are properly lubricated and have proper electrical supply and proper rotation.

9.For field-installed starters only, test the chiller compres- sor motor and its power lead insulation resistance with a 500-v insulation tester such as a megohmmeter. (Use a 5000-v tester for motors rated over 600 v.) Factory- mounted starters do not require a megohm test.

a.Open the starter main disconnect switch and follow lockout/tagout rules.

If the motor starter is a solid-state starter, the motor leads must be disconnected from the starter before an insulation test is performed. The voltage generated from the tester can damage the starter solid-state components.

b.With the tester connected to the motor leads, take 10-second and 60-second megohm readings as follows:

6-Lead Motor — Tie all 6 leads together and test between the lead group and ground. Next tie the leads in pairs: 1 and 4, 2 and 5, and 3 and 6. Test between each pair while grounding the third pair.

3-Lead Motor — Tie terminals 1, 2, and 3 together and test between the group and ground.

c.Divide the 60-second resistance reading by the 10-second reading. The ratio, or polarization index, must be one or higher. Both the 10- and 60-second readings must be at least 50 megohms.

If the readings on a field-installed starter are unsat- isfactory, repeat the test at the motor with the power leads disconnected. Satisfactory readings in this second test indicate the fault is in the power leads.

NOTE: Unit-mounted starters do not have to be megohm tested.

10.Tighten all wiring connections to the plugs on the ISM and CCM modules.

11.On chillers with free-standing starters, inspect the power panel to ensure that the contractor has fed the wires into the bottom of the panel. Wiring into the top of the panel can cause debris to fall into the contactors. Clean and in- spect the contactors if this has occurred.

Carrier Comfort Network Interface — The Carrier Comfort Network (CCN) communication bus wiring is sup- plied and installed by the electrical contractor. It consists of shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each sys- tem element communication connector must be wired to the positive pins of the system element on either side of it. The negative pins must be wired to the negative pins. The signal ground pins must be wired to the signal ground pins. See instal- lation manual.

NOTE: Conductors and drain wire must be 20 AWG (American Wire Gage) minimum stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/ nylon, vinyl, Teflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum operating tempera- ture range of –4 F to 140 F (–20 C to 60 C) is required. See table below for cables that meet the requirements.

MANUFACTURER	CABLE NO.
Alpha	2413 or 5463
American	A22503
Belden	8772
Columbia	02525

When connecting the CCN communication bus to a system element, a color code system for the entire network is recom- mended to simplify installation and checkout. The following color code is recommended:

	CCN BUS
SIGNAL TYPE	CONDUCTOR	CCN TERMINAL
	INSULATION	CONNECTION
	COLOR
+	Red	RED (+)
Ground	White	WHITE (G)
–	Black	BLACK (–)

Check Starter

BE AWARE that certain automatic start arrangements can engage the starter. Open the disconnect ahead of the starter in addition to shutting off the chiller or pump.

Use the instruction and service manual supplied by the start- er manufacturer to verify the starter has been installed correct- ly, to set up and calibrate the starter, and for complete trouble- shooting information.

The main disconnect on the starter front panel may not deenergize all internal circuits. Open all internal and remote disconnects before servicing the starter.

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