Multi-Function Board Instruction - Carrier DHMVHA Service Manual

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MULTI-FUNCTION BOARD INSTRUCTION

Function
The multi-function board receives a 4-cored wired controller signal and the CP remote on-off signal (ON-OFF command signal). Next, the board
converts the signal to a communication signal and sends the signal to the main control board. The multi-function board can output the alarm signal.
CP Remote ON-OFF
For the CP command, closed indicates the remote on-off control signal is OFF. Disconnected indicates the remote on-off control signal is ON. The
control requires 3 seconds to determine the ON or OFF status. The CP command is delivered one time (immediately) after powering on. The Dip-
switch F2 setting status appears in Table 8.
DIP-SWITCH 2
OFF
ON
ON-OFF Control
The control requires 3 seconds to determine the ON/OFF status. The ON-OFF command is not sent after powering on. Instead the command is sent
only after a change in the status occurs. When the ON-OFF control disconnects, it sends the switch-on signal. The unit runs in the AUTO mode
(AUTO FAN speed (75.2F (24C)) setting temperature. When the ON-OFF control is closed, it sends a switch-off signal. The Dip-switch F2 setting
status appears in Table 9.
DIP-SWITCH 2
OFF
ON
Alarm Port Output
• When the unit is OFF, the output signal is closed.
• When the unit is in a malfunction state, the output signal is closed.
• When the unit is ON, the output signal is disconnected.
Wiring Diagram
Connected to 4-cored wired controller
NOTE: Use shield cables to connect the 4-cored wired controller. The length should not exceed 164 ft. (50m).
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 8 — Dip-switch F2 setting status
DIP-SWITCH 1
OFF
OFF
Table 9 — Dip-switch F2 setting status
DIP-SWITCH 1
ON
ON
Fig. 13 —Wiring Diagram
12
REMOTE ON-OFF CONTROL STATUS
Disconnected send CP, closed cancel CP
Closed send CP, disconnected cancel CP
REMOTE ON-OFF CONTROL STATUS
Disconnected send ON, closed send OFF
Closed send OFF, disconnected send ON