Carrier 40MBAB - Connection Diagrams and Control Methods

40MBAB: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
21
CONNECTION DIAGRAMS AND CONTROL METHODS
The air handler fan coil unit can be controlled mainly through the
following methods.
• SCENARIO #1 Wired controller (Included, optional accessory) -
KSACN1001AAA:
Non-polarity controller used to operate all functions. The wired
controller is equipped with an infrared receiver and can be used in
conjunction with the wireless controller.
For this scenario to be enabled SW1-1 must be set to the OFF positions
(Default).
• SCENARIO #1 Wireless controller (Included):
Hand-held wireless remote provides the same functionality as the wired
controller and can be used in conjunction with the wired controller. Refer to the
Owner’s Manual for the remote’s operational instructions.
For this scenario to be enabled SW1-1 must be set to the OFF position
(Default).
• SCENARIO #2 Third party heat pump thermostat (Not Included):
Allows the control of the air handler via the built-in 24V interface.
To enable this scenario, SW1-1 must be set to the ON position.
A221168
Fig. 52 —Connection Methods for 18K-36K Residential Units
A221169
Fig. 53 —Connection Methods for 36K-60K Light Commercial Units
Fig. 54 —Control & Power Terminal on Indoor Unit (Sizes 18K,
24K, 30K, 36K) Non-Light Commercial Models
Fig. 55 — Control and Power Terminal on Indoor Unit
(Sizes 36K, 48K, 60K) Light Commercial Models
NOTE: When DIP SWITCH SW1 is set to default, the system automatically detect a the wiring method according to scenarios 1 and 2. In case
of unexpected failure, DIP SWITCH SW1 can be set according to each wiring method.
21 3 4
ON
SW1
Indoor unit
RCGY1Y2
Y2
B W W1W2 E DH L
R C G Y1 Y2 B W W1W2E DH L
24V Thermostat
1 2 3 4
ON
SW1
Current loop communication
Current loop communication
R C G Y1 B W W1W2 E DH L
Indoor unit Wired
controller
Wired
controller
Outdoor unit
1 2 3
Outdoor unit
1 2 3
1 2 3
1 2 3
Scenario 1
Scenario 2
21 3 4
ON
SW1
Indoor unit
RCGY1Y2
Y2
B W W1W2 E DH L
R C G Y1 Y2 B W W1W2E DH L
24V Thermostat
1 2 3 4
ON
SW1
R C G Y1 B W W1W2 E DH L
Indoor unit Wired
controller
Wired
controller
S1 S2
Outdoor unit
S1 S2
S1 S2
Outdoor unit
S2 S1
Non-polarity RS485 communication
Non-polarity RS485 communication
Scenario 1
Scenario 2
L1(1) L2(2) S(3)