Carrier 040-420 - Manual (Page 68)

ACCESSORY UNLOADER INSTALLATION
Some of the 30G II units come standard with
unloader(s), and many permit additional unloader(s) to be
added if desired. See Table 18.
IMPORTANT: Accessory hot gas bypass cannot be
installed with accessory unloaders on units with more
than 4 compressors.
If accessory unloaders are desired, an accessory unloader
package is used. Package includes a suction cutoff unloader
head package. The 24-v coil in the package can be used for
040-l 10, 130 (60 Hz) and associated modular units. A
115 v or 230 v coil must be used for 130 (50 Hz), 150-210,
225, 250, 280, and associated modular units. Coil voltage
depends on control circuit voltage, Consult current Carrier
price pages for appropriate part numbers.
3.
4.
NOTE: The accessory package will include all necessary
components and wiring with the following exceptions: The
field must provide screws, and on the 130-2 10, 225, 250,
280, and associated modular units, the field must also sup-
ply a
vdc (part number unloader relay
and wire (90” C or equivalent).
Wire the primary side of the transformer in parallel with
TRAN3. See Fig. 23. This supplies transformer with proper
line voltage. Be sure to connect proper tap of the trans-
former to ensure supply of proper secondary voltage.
Wire the secondary side of transformer to DSIO-LV
and a jumper from DSIO-LV to DSIO-LV
Wire the secondary common to Connect
the transformer ground to ground hole supplied near the
transformer. These connections provide DSIO with nec-
essary power to energize the solenoid coils.
When all connections are made, check for proper wiring
and tight connections. Replace and secure inner panel.
Restore power to unit.
Configure the processor. With the addition of extra un-
loaders, the unit configuration has changed. To change
the configuration of the processor, enter the service func-
tion using the keypad and display module. Before any
changes can be made, the
CCN switch must be in the STOP position, and the ser-
vicer must log on to the processor.
a.
Table 18 Standard and Accessory Unloaders
I NO. OF ACCESSORY
Circuit A Circuit B
or2
1
0
0
*And associated modular units
Installation
1
1
1.
2.
3.
4.
0 4
1.
Be sure all electrical disconnects are open and tagged
before any work begins. Inspect the package contents
for any damage during shipping. File a claim with the
shipper if damage has occurred.
For ease of installation, factory-supplied wiring for the
additional unloader is provided in the compressor
harness.
Install the additional unloader cylinder head on the lead
compressor, Al or
according to instructions pro-
vided by the compressor manufacturer in the accessory
package.
Continue installation per either 040-l 10, 130 (60 Hz)
units or 130 (50 Hz), 150-210, 225, 250, and 280 units
section as appropriate.
10, 130 (60 Hz) UNITS (and associated modular units)
Wire the solenoid before any field wiring begins. Wir-
ing between components and control box must be en-
closed in conduit. All local electrical codes and National
Electrical Code (NEC) must be followed. Factory wires
are provided in the compressor harness to connect the
solenoid. These wires are in the compressor control box.
5.
6.
C.
d.
Press Keypad LCD displays the word
PASSWORD.
Enter . d i s p l a y s K e y p a d LCD
LOGGEDON.
To change configuration, press Keypad LCD
displays FLD CFG.
If an additional unloader was added to compressor
Al, press until NULA 1 appears in keypad dis-
play. Press f o r t h e n u m b e r o f u n l o a d e r s o n
circuit A. Keypad display now reads NULA 2.
If an additional unloader was added to compressor
B 1, press
q
until NULB appears in keypad dis-
play. Press for the number of unloaders on
circuit B. Keypad display now reads NULB 2.
When configuration is complete, press Key-
pad display reads LOGGEDON. Press until
pad display reads LOG OFF. Press . Keypad dis-
play reads EXIT LOG.
Using test function, check unloaders. Press Key-
pad display reads OUTPUTS. Press until display
reads ULA 2 OFF. Press
q
. Relay energizes. Press
and relay deenergizes. Press until display reads
ULB2 OFF. Press . Relay energizes. Press
q
and relay deenergizes.
When unloader check has been performed, return LOCAL/
ENABLE-STOP-CCN to proper position. Close and se-
cure control box door.
2. Wire the control side. Open the left side control box
door and remove inner panel. Using the holes provided
and field-supplied screws, install field-supplied trans-
former above the DSIO-LV on the control panel.
68