Filter
Top Products
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 (AndAssociated 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 field-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 field 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. 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-
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 configuration, 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 configuration 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 confirm that the chiller operates
properly.
67