Carrier 30GN040-420 pad display reads OUTPUTS. Press until display, Wire in the solenoid valves

5.Using test function, check unloaders. Press . Key-

pad display reads OUTPUTS. Press until display

reads UNA2 OFF. Press . Relay energizes. Press and relay deenergizes. Press until display reads

UNB2 OFF. Press . Relay energizes. Press and relay deenergizes.

6.When unloader check has been performed, return LOCAL/ ENABLE-STOP-CCN to proper position. Close and se- cure control box door.

130 (50 Hz), 150-210 UNITS (And Associated Modular Units)

1.Install control wiring. The minimum wire size for instal- lation is 16 AWG (American Wire Gage). Refer to Fig. 23 and 24 for proper wiring. Open the control box door. Locate unloader relays A and B (UA, UB) in place of the hot gas bypass relays as shown on the component arrangement diagram on the unit. Mount the relays with the ®eld-supplied screws. Be careful not to damage the components and wiring in the area when mounting the relays.

2.Wire the control side. Wire the UA coil in series between J6-18 and J6-19 of the 4 IN/4 OUT module with the wires provided. Wire the UB coil in series between J6-21 and J6-22 of the same module with the wires provided.

Locate the black wire in the control harness originating from TRAN5 labeled HGBPR-A-COM. Connect this wire to the UA terminal COM. Connect the wire labeled HGBPR- A-NO to UA-NO. Connect the wire from UA-NO to TB3-5. For an extra unloader on circuit B, connect the wire labeled HGBPR-B-COM to UR-B-COM, and the wire labeled HGBPR-B-NO to UB-NO. Connect the wire from UB-NO to TB3-6.

3.Wire in the solenoid valves.

NOTE: Wires external to the control box must be run in conduit.

Terminal blocks are provided for easy ®eld wiring. Use one of the isolated 7¤8-in. (22-mm) holes in the side of the compressor electrical box with a strain relief to run the wires to the solenoid coil. Connect UA between TB3-5 and TB3-8. Connect UB between TB3-6 and TB3-8. Check all of the electrical connections for proper location and tightness, and replace and secure the electrical box of the compressor.

4.Con®gure the microprocessor. Once the relays are mounted in the control box, the microprocessor must be con®g- ured for the unloader option. To do so:

a.Be sure the LOCAL/ENABLE-STOP-CCN switch is in the STOP position.

b. Log into the processor and enter the service func- tion using the keypad and display module.

Press . The keypad LCD will display

``PASSWORD.'' Enter , and the keypad LCD will display ``LOGGEDON.''

c.To change the con®guration, press , and the keypad LCD will display ``FLD CFG.'' Press

until either ``NULA 0'' or ``NULA 1'' is displayed (depending on the number of unloaders provided as

standard). Then press (for 1 unloader on A1)

or (for 2 unloaders on compressor A1). The display will now read either ``NULA 1'' or

``NULA 2,'' as appropriate. Press to get to the NULB display, and change this setting in the same man- ner as with circuit A.

d.Once the con®guration is complete, press , and the keypad LCD will display ``LOGGEDON,''

Press until the keypad LCD display reads ``LOG

OFF.'' Press and the keypad LCD will display ``EXIT LOG.''

5.Once the unloader heads are installed, the unit is checked for leaks, and the system is prepared for operation per the instructions for the compressor unloader head installa- tion, check the output of the relays using the test function as follows:

a.Press , and the display will read ``COMP.''

b.Press the to scroll down until the display reads ``CPA1 OFF.''

c.Press , and the compressor should start.

d.Press , and the compressor should stop.

e.Press until the display reads ``UNA1 OFF.''

f.Press , and the solenoid should energize.

g. Press and the solenoid should deenergize.

h.Use the and keys to check the remainder of the unloader coils.

6.Once the check has been performed, return the LOCAL/ ENABLE-STOP-CCN switch to the proper position.

7.Close and secure the control box door.

8.Start the unit and con®rm that the chiller operates properly.

67