Compressor Operation Output : Tcb-Pcin4Ul - Carrier MMY-MAP0724FT9UL Service Manual

7-3-8. Compressor Operation Output : TCB-PCIN4UL

Outdoor unit
interface PCB
ON
OFF
When a compressor is in operation, a relay connected to the output terminal assigned to it is turned on
(closed).
When it is at rest, the relay is turned off (open).
The output terminals are named OUTPUT1, OUTPUT2 and OUTPUT3 from left to right when facing the front
of the outdoor unit, as shown in the diagram.
Note 1: Output Relay (K1, K2, K3) Contact Specifications
• Output terminals (OUTPUT1, 2, 3) must satisfy the following electrical rating.
• When connecting a conductive load (e.g. relay coil) to loads K1, K2 and K3, insert a surge killer CR (for an AC
power supply) or a diode for preventing back electromotive force (for a DC power supply) on the bypass circuit.
<Electrical Rating>
208-230 VAC, 10 mA or more, 1A or less
24 VDC, 10 mA or more, 1 A or less (non-conductive load)
C2 Connection cable 2 (CN514)
CN514 Interface-side connector (green)
CTR1 Elapsed operation counter 1
CTR2 Elapsed operation counter 2
CTR3 Elapsed operation counter 3
K1,K2,K3 Relay
L1,L2,L3 Operation indication lamp
OUTPUT1 Compressor 1 in-operation output terminal
OUTPUT2 Compressor 2 in-operation output terminal
OUTPUT3 Compressor 3 in-operation output terminal
PJ20 Optional P.C. board-side connector
PS Power supply unit
TB1 Terminal block
Optional PCB
Outdoor unit
C2
SW16
CN514 PJ20
1 2 3 4
Model featuring three
compressors
1 2 3
OUTPUT1 OUTPUT2 OUTPUT3
Locally procured
(See "NOTE")
TB1
1 CTR1
K1
OUTPUT1
2
CTR2
3
K2
OUTPUT2
4
CTR3
5
K3
OUTPUT3
6
Shield
wire
Model featuring
two compressors
1 2
OUTPUT1
OUTPUT2
– 77 –
L1 PS
L2 PS
L3 PS