Carrier 040-420 specifications Wire in the solenoid valves

130 (50 Hz), 150-210, 225, 250, AND 280 UNITS (and associated modular units)

1.Install control wiring. The minimum wire size for in- stallation is 16 AWC (American Wire Gage). Refer to Fig. 24 and 25 for proper wiring. Open the control box door. Locate unloader relays A and B (URA, URB) in place of the hot gas bypass relays as shown on the com- ponent arrangement diagram on the unit. Mount the re- lays with the field-supplied screws. Be careful not to damage the components and wiring in the area when mount- ing the relays.

2Wire the control side. Wire the URA coil in series be- tween 56-18 and J6- 19 of the 4 IN/4 OUT module with the wires provided. Wire the URB coil in series be- tween J6-21 and J6-22 of the same module with the wires provided.

Locate the black wire in the control harness originating from TRANS labeled HGBPR-A-COM. Connect this wire to the URA terminal COM. Connect the wire labeled HGBPR-A-NO to URA-NO. Connect the wire from URA-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 URB- NO. Connect the wire from URB-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 field wiring. Use one of the isolated ‘/s-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 URA between TB3-5 and TB3-8. Connect URB between TB3-6 and TB3-8. Check all of the electrical connections for proper location and tightness, and replace and secure the elec- trical box of the compressor,

4.Configure the microprocessor, Once the relays are mounted in the control box, the microprocessor must be config- 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- t i o n u s i n g t h e k e y p a d a n d d i s p l a y m o d u l e .

Type r\ I;;;;E] . The keypad LCD will display

“PASSWORD.” Enter ~~1~~~~, and the keypad LCD will display “LOGGEDON. ”

C, To change the configuration, type 14 H, and the keypad LCD will display “FLD CFG.” Press m

until either “NULA 0” or “NULA I” is displayed (depending on the number of unloaders provided as

standard), Then press m H (for 1 unloader on Al)

or FiFi (for 2 unloaders on compressor Al). The d i s p l a y w i l l n o w r e a d e i t h e r “ N U L A 1 ” o r

‘ ‘NULA 2, ” as appropriate, Press I)I to get to the NULB display, and change this setting in the same manner as with circuit A.

d.Once the configuration is complete, press m Fi, and the keypad LCD will display “LOGGEDON,”

Press @ until the keypad LCD display reads “LOG

OFF.” Press H 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 instal- lation, check the output of the relays using the test func- tion as follows:

a. Press T;1H, and the display will read “COMP.”

b. Press the q to scroll down until the display reads “CPA1 OFF.”

c. Press ENTR , and the compressor should start. 0

d.Press a + , and the compressor should stop.

e.Press c + l until the display reads “ULAl OFF.”

f.Press H , and the solenoid should energize.

g.Press q and the solenoid should deenergize.

h.Use the a and H 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 confirm that the chiller operates properly.

		LEGEND
COM	-	Communications Bus		- Terminal		Block
HGBPR	-	Hot Gas Bypass Relay	TLN	-	Transformer
KB	1	Normally Open		-	Unloader
		Snubber	kl	- Unloader		Relay

Fig. 24 - Flotronic’” II 115/230-V Unloader Wiring, 130 (50 Hz), 150-210, 225, 250, 280

70