20
ACB Interface — The ACB interface is a dry contact
board that can output up to four signal controlling devices.
Refer to Fig. 22, 23, and 32 for connecting the ACB interface
board and devices.
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 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 the open
position.
Drain Pump and Drainage Test — Follow these
steps to perform the test:
1. Remove the test cover by rotating it counter-clockwise as
shown in Fig. 33.
2. Use a piece of tubing or pipe to fill the drain pump
reservoir with 70 oz. of water. See Fig. 34 below.
3. Turn the unit ON in cooling mode. The pump comes on.
Watch the end of the drain pipe for any water. It may take
time for the water to travel depending on the length of the
drain pipe.
4. During this test, check any bends or joints for leakage.
System Operation Check — Once the installation
and pre-start checks are complete, perform the following steps:
1. Using the 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
error is indicated.
c. Swing mode of air louvers is working (if applica-
ble to unit).
d. Drain pump operation is normal (if applicable).
e. No abnormal vibration or noise.
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.
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. 32 — ACB Interface
MAX AMPS 1A
MAX VOLTAGE 24V
ACB interface
FAN
CTON
HTON
AUXH
C
L
O
S
E
D
O
P
E
N
E
D
O
O
C
S
L
P
E
N
Test Cover
Fig. 34 — Tube/Pipe Insert
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