Carrier 50FK User Manual
Page 6
Table 3 — Output Pin and Terminal Assignments
OUTPUT PIN-
TERMINAL
NAME
RATING
DEVICE
J6-1
Stage 1
Compressor Relay (K1)*
24 vac
CR1
J6-2
Stage 2
Compressor Relay (K2)*
U2**
J6-3
Stage 3
Compressor Relay (K3)*
U1
J6-4
Stage 4
Compressor Relay (K4)†
Not Used
J6-5
Stage 5
Compressor Relay (K5)†
CR2
J6-6
Stage 6
Compressor Relay (K6)†
Not Used
J6-7
Economizer Open Relay (K7)
EOR
J6-8
Economizer Close Relay (K8)
ECR
J5-1
Supply Fan Relay (K9)
115 vac
IFC
J5-2
Morning Warm-Up Relay (K10)
HIR
J5-3
Stage 1 Condenser
Fan Relay (K11)
OFC2/OFC3 ††
J5-4
Stage 2 Condenser
Fan Relay (K12)
OFC4
J5-5
External Alarm Relay (K13)
ALM
LEGEND
ALM — Alarm
CR
— Control Relay
ECR — Economizer Close Relay
EOR — Economizer Open Relay
HIR
— Heat Interlock Relay
IFC
— Indoor (Evaporator) Fan Contactor
OFC — Outdoor (Condenser) Fan Contactor
U
— Unloader
*Circuit 1.
†Circuit 2.
**U2 is not used on 044 units.
††OFC2 on 034-048 units; OFC3 on 054-104 units.
Used on 054-104 units only.
LEGEND
CR — Control Relay
J
— Terminal Pin Connectors
K
— Relay
Fig. 5 — Relay Board
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