15
IMPORTANT:
The system can connect 64 indoor units with
different system addresses. If two indoor units in the same sys
-
tem have identical addresses, abnormal operation will occur.
ACB Interface (Reserved)
—
The ACB interface is a dry
contact board that can output up to four signals controlling
devices. Refer to Fig. 15 and 26 for connecting the ACB
interface board and devices.
Fig. 26 —ACB Interface
WIRING BETWEEN OUTSIDE AIR AND REHEAT
UNIT —
Fig. 27 —Wiring Between Outside Air and Reheat
Unit
START-UP —
Pre-Start Check —
Once 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 (optional) 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
—
Follow these steps once the
installation and pre-start checks are completed:
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. There is no noticeable abnormal vibration or noise.
3. While the system is in operation, check the following on
outdoor unit:
a. There is no noticeable abnormal vibration or noise.
b. The condenser fan is in operation.
c. The 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
power is restored.
CN50
CN51
ACB interface
FAN CTON HTON AUXH
MAX AMPS - 1A
MAX VOLTAGE - 24V
ACB - Auxillary Control Board
FAN - Output for Fan Operation
CTON - Output for Cooling Operation
HTON - Output for Heating Operation
AUXH - Output for Auxillaty Heat
