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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.
Wire 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.
2
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-
tion using the keypad and display module.
Type
r\
I;;;;E]
. The keypad LCD will display
“PASSWORD.” Enter
~~1~~~~,
and the
keypad LCD will display “LOGGEDON. ”
COM
-
HGBPR
-
KB
1
5
C,
d.
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
display will now read either “NULA 1” or
‘
‘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.
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.”
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
,
0
and the compressor should start.
d. Press
+
,
a
and the compressor should stop.
e. Press
+
cl
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
Communications Bus
-
Terminal Block
Hot Gas Bypass Relay
TLN
-
Transformer
Normally Open
Snubber
kl
-
Unloader
-
Unloader Relay
Fig. 24 - Flotronic’”
II 115/230-V Unloader Wiring, 130 (50 Hz), 150-210, 225, 250, 280
70