Acb (Auxiliary Control Board) Interface; Start-Up; Pre-Start Check; System Operation Check - Carrier 40VMU012 Installation And Maintenance Instructions Manual

IMPORTANT: The system can connect 64 indoor units,
with different system addresses. If two indoor units in the
same system have identical addresses, abnormal operation
will occur.
ACB (
Auxiliary Control Board)
ACB interface is a dry contact board; it can output up to four
signals controlling devices. Please refer to Fig. 15 and 24 to
connect the ACB interface board and devices.
ACB interface
CN50
FAN CTON HTON AUXH
MAX AMPS 1A
MAX VOLTAGE 24V
LEGEND
ACB — Auxiliary Control Board
FAN — Output for Fan Operation
CTON — Output for Cooling Operation
HTON — Output for Heating Operation
AUXH — Output for Auxiliary Heat
Fig. 24 —ACB Interface

START-UP

Pre-Start Check —
Once installation is complete, make
the following pre-start checks:
1. All indoor and outdoor units are properly installed.
2. All piping and insulation is complete.
3. All electrical connections (both power and control) are
properly terminated.
4. All condensate drains are installed correctly.
5. The power supply is of the right voltage and frequency.
6. The units are properly grounded in accordance with cur-
rent electrical codes.
7. Suction and liquid line service valves are in open posi-
tion.
System Operation Check —
and pre-start checks are completed, follow these steps:
1. Using remote controller, select cooling or heating mode
to check the operation of the system.
2. While the system is in operation, check the following on
indoor unit:
a. Switches or buttons on the remote controller are easy to
push.
b. Indicator light is showing normal operation and no er-
ror is indicated.
Interface —
The
CN51
Once the installation
13
c. Swing mode of air louvers is working (if applicable to
unit).
d. Drain pump operation is normal (if applicable).
e. No abnormal vibration or noise is noticed.
3. While the system is in operation, check the following on
outdoor unit:
a. No abnormal vibration or noise is noticed.
b. Condenser fan is in operation.
c. Indicator light is showing normal operation and no er-
ror is indicated.
NOTE: If the unit is turned off or restarted, there is a time
delay of 3 minutes for the compressor to start from the time the
power is restored.

MAINTENANCE

CAUTION
When servicing or repairing this unit, use only factory-
approved service replacement parts. Refer to the rating
plate on the unit for complete unit model number, serial
number and company address. Any substitution of parts or
controls not approved by the factory will be at the owner's
risk and may result in equipment damage.
CAUTION
To avoid equipment damage, do not attempt to reuse any
mechanical or electrical controllers that have been wet.
Replace defective controller.
EVERY 3 MONTHS:
• Check the air filter condition. Clean or replace if neces-
sary.
EVERY 6 MONTHS — Follow 3-month maintenance sched-
ule. In addition:
• Clean condensate tray with suitable cleaning agent.
• Clean the grille and panel, if applicable.
EVERY 12 MONTHS — Follow 6-month maintenance
schedule. In addition:
• Be sure all electrical connections are secure.
• Check condensate pump operation.
• Check the heating and cooling action to confirm proper
operation.

INDOOR UNIT ADDRESSING

For proper system operation each indoor unit must have a
unique address set from 0 to 63. When setting an address by re-
mote controller the outdoor units, indoor units, and Multiport
Distribution Controller (MDC) must be powered on. If "FE" is
displayed on the LED screen or display board this unit has no
address. After setting all indoor units' addresses, turn off the
power supply to all indoor units to clear errors.
Indoor units' addressing can be distributed automatically in
the heat pump system. When dip switch "S6" on the outdoor
units main PCB board is set to 00 (default set in factory) indoor
unit's are set for auto-addressing. When powering on for the
first time it takes 6 minutes or more to finish auto-addressing
each indoor unit. The heat recovery system cannot accomplish
this function at this time.