18
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 INTERFACE
The ACB interface is a dry contact board that can output up to
four signals controlling devices. Refer to Fig. 17, 18, and 29 for
connecting the ACB interface board and devices.
Fig. 29 —ACB Interface
START-UP
Pre-Start Check — Once the installation is complete, perform
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
current electrical codes.
7. Suction and liquid line service valves are in open
position.
System Operation Check — Once the installation 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
the indoor unit:
a. Switches or buttons on the remote controller are
easy to push.
b. The indicator light is showing normal operation
and no error is indicated.
c. Swing mode of air louvers is working (if
applicable to the 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
the 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
error is indicated.
NOTE:
If the unit is turned off or restarted, there is a time
delay of three minutes for the compressor to start from the
time the power is restored.
MAINTENANCE
Fan Assembly Maintenance —
Refer to the
following figures and instructions for removing fan assemblies
as needed for repair and service.
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
CN50
CN51
ACB interface
FAN CTON HTON AUXH
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 exposed
to moisture. Replace the defective controller.
CAUTION
1. Shut down the unit and cut off power performing
maintenance.
2. Before dismounting the fan assembly, disconnect all
wires between the fan and the controller.
3. The Fan sub-assembly is very heavy so be careful
while handling. Otherwise physical injury can occur.