Compressor Expansion Module (Cxb); Aux Board (Aux); Enable/Off/Remote Contact Switch; Emergency On/Off Switch - Carrier GEMINI 38APS025-065 Installation Instructions Manual

Air-cooled condensing units with puron refrigerant
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RED LED - STATUS
J1
J2
J3
J4
J5
J6
J7
Table 3 — Thermistor Designations
THERMISTOR INPUT
Return Air (Accessory)
Supply Air (Accessory)
Compressor Return Gas
Temperature A
Compressor Return Gas
Temperature B
Outdoor Air Temperature
Discharge Temperature
(Digital Option Only)
Space Temperature (Accessory)
Table 4 — Switch Inputs
SWITCH INPUT
Thermostat Y1 (Accessory)
Thermostat Y2 (Accessory)
Fan Status 1 (Accessory)
Fan Status 2 (Accessory)
Remote On/Off
High Pressure Switch A
High Pressure Switch B
Compressor Expansion Module (CXB) —
CXB is only used on unit sizes 070-100 to provide additional
inputs and outputs for fans and compressors when the unit has
more than 4 compressors.
The AUX is used with the digital
AUX Board (AUX) —
scroll option and the low ambient head pressure option. It pro-
vides additional inputs and outputs for digital scroll control
along with analog outputs to control head pressure control fan
speeds.
Enable/Off/Remote Contact Switch —
Off/Remote Contact switch is a 3-position switch used to
control the unit. When switched to the Enable position, the unit
is under its own control. Move the switch to the Off position to
shut the unit down. Move the switch to the Remote Contact po-
sition and a field-installed dry contact can be used to start the
unit. The contacts must be capable of handling a 24 vac, 50 mA
load. In the Enable and Remote Contact (dry contacts closed)
GREEN LED -
LEN (LOCAL EQUIPMENT NETWORK)
CEPL130346-01
STATUS
LEN
CCN
Fig. 20 — Main Base Board
PIN CONNECTION POINT
MBB J8-11,12; LVT 19,20
MBB J8-12,13; LVT 11,19
MBB J8-1,2
MBB J8-3,4
MBB J8-7,8
AUX J6-1,2
MBB J8-5,6; LVT 21,22
PIN CONNECTION POINT
LVT 12,18
LVT 15,18
LVT 16,18
LVT 17,18
LVT 13,14
MBB J6-4
MBB J6-6
The
The Enable/
YELLOW LED -
CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER
K11
K8
K7
K4
K3
J8
positions, the unit is allowed to operate and respond to the
scheduling configuration, CCN configuration and set point
data. See Fig. 21.
Emergency On/Off Switch —
switch should only be used when it is required to shut the
unit off immediately. Power to the MBB, CXB, AUX, EMM,
and scrolling marquee display is interrupted when this switch is
off and all outputs from these modules will be turned off.
Board Addresses —
3-position Instance jumper that must be set to 1. All other
boards have 4-position DIP switches. All switches are set to
On for all boards.

Control Module Communication

RED LED
Proper operation of the control boards can be
visually checked by looking at the red status LEDs
(light-emitting diodes). When operating correctly, the red status
LEDs should be blinking in unison at a rate of once every
2 seconds. If the red LEDs are not blinking in unison, verify
that correct power is being supplied to all modules. Be sure that
the main base board (MBB) is supplied with the current soft-
ware. If necessary, reload current software. If the problem still
persists, replace the MBB. A red LED that is lit continuously or
blinking at a rate of once per second or faster indicates that the
board should be replaced.
GREEN LED
The MBB has one green LED. The Local
Equipment Network (LEN) LED should always be blinking
whenever power is on. All other boards have a LEN LED
which should be blinking whenever power is on. Check LEN
connections for potential communication errors at the board J3
and/or J4 connectors. Communication between modules is
accomplished by a 3-wire sensor bus. These 3 wires run in
parallel from module to module. The J4 connector on the MBB
provides both power and communication directly to the
marquee display only.
YELLOW LED
The MBB has one yellow LED. The
Carrier Comfort Network (CCN) LED will blink during times
of network communication.
19
K10
K9
K5
K6
J10
K1
K2
J9
The Emergency On/Off
The main base board (MBB) has a

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