Carrier HFC-134A installation instructions Cable Manufacturers, A23-1595, A23-1596

COMPLETING THE INSTALLATION

This section provides instructions on how to perform a final check of the installation. Do not energize the VFD circuit breaker. This should only be done by qualified Carrier person- nel in accordance with the 23XRV Start-Up and Service Manual.

Checking the Installation — Use the following pro- cedure to verify the condition of the installation:

DC bus capacitors in the VFD retain hazardous voltages after input power has been disconnected. After disconnect- ing input power, wait 5 minutes for the DC bus capacitors to discharge then check both the VFD DPI Communica- tions Interface Board Status LEDs and the VFD with a voltmeter to ensure the DC bus capacitors are discharged before touching any internal components. Failure to observe this precaution could result in severe bodily injury or loss of life.

1.Turn off, lock out, and tag the input power to the drive. Wait five minutes.

2.Verify that there is no voltage at the input terminals (L1, L2, and L3) of the power module.

3.Verify that the status LEDs on the DPI Communications Interface Board are not lit. See Fig. 48. The location of the Communications Interface Board is shown in Fig. 6.

4.Remove any debris, such as metal shavings, from the enclosure.

5.Check that there is adequate clearance around the machine in accordance with the certified print.

6.Verify that the wiring to the terminal strip and the AC input power terminals is correct.

7.Check that the wire size is within terminal specifications and that the wires are tightened properly.

8.Check that specified branch circuit protection is installed and correctly rated.

9.Check that the incoming power is rated correctly.

10.Verify that a properly-sized ground wire is installed and a suitable earth ground is used. Check for and eliminate any grounds between the power leads. Verify that all ground leads are unbroken.

Oil Pump and Oil Heater — The oil pump and oil heater are wired at the factory. It is not necessary to connect additional wiring to these components. See Fig. 51 and 52.

Voltage to terminals T1 and T3 on the 1C and 6C contac- tors comes from a control transformer in the starter built to Carrier specifications. Do not connect an outside source of control power to the chiller (terminals T1 and T3). An outside power source will produce dangerous voltage at the line side of the starter, because supplying voltage at the transformer secondary terminals produces input level voltage at the transformer primary terminals (see Fig. 46, 51, and 52).

a23-1595

LEGEND

Factory Wiring

Power Panel Component Terminal

Contactor

Fig. 51 — Oil Pump Wiring

a23-1596

LEGEND

Factory Wiring

Power Panel Component Terminal

Fig. 52 — Oil Heater and Control Power Wiring

Connect Control Wiring — All control wiring must use shielded cable. Refer to the job wiring diagrams for cable type and cable number. Make sure the control circuit is ground- ed in accordance with applicable electrical codes and instruc- tions on machine control wiring label.

Carrier Comfort Network® Interface — The Car- rier Comfort Network (CCN) communication bus wiring is supplied 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 system 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 Fig. 49 for location of the CCN network connections on the terminal strip labelled CCN.

NOTE: Conductors and drain wire must be 20 AWG (Ameri- can 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 temperature range of –4 F to 140 F (–20 C to 60 C) is required. See Table 13 for cables that meet the requirements.

Table 13 — Cable Manufacturers

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

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