Carrier 48TC 17 Series Service And Maintenance Instructions page 15

Point Name
Humidistat/LTLO DI, 24VAC
Thermostat W1 DI, 24VAC
Econ Y1 DI, 24VAC
Thermostat G DI, 24VAC
24V Power (J1) 24VAC
24V Power (J2) 24 VAC
Econ Y2 DI, 24VAC
COMP1 DO, 24VAC
IFM DO, 24VAC
COMP2 DO, 24VAC
LSV DO, 24VAC
DSV1 DO, 24VAC
NOT LSV DO, 24VAC
DSV2 DO, 24VAC
LEGEND
COMP — Compressor
CTB — Control Terminal Board
DI — Discrete Input (switch)
DO — Discrete Output (switch)
DSV — Discharge (gas) Solenoid Valve
ECON — Economizer
FPT — Freeze Protection Thermostat
IFM — Indoor (supply) Fan Motor
LSV — Liquid Solenoid Valve
LTLO — Low Temperature Lockout
REHEAT — Connection Strip REHEAT (on CTB)
HUM
Y1 Y2 W1 G / LT­
LO
OFF OFF OFF ON OFF
ON OFF OFF On OFF
ON ON OFF ON OFF
OFF OFF ON X OFF
OFF OFF OFF ON ON
ON OFF OFF ON ON
ON ON OFF ON ON
OFF OFF ON X ON
OFF OFF ON X ON
+
W2
Table 1 – Humidi−MiZerR Reheat Control Board I/O
Connection
Type
Pin Number
J1A - 1 (1)
J1A - 2 (2)
J1A - 6 (6)
J1B - 1 (7)
J1B - 3 (9)
J2 - 1
J1B - 5 (11)
J1A - 5 (5)
J1B - 4 (8)
J1B - 4 (10)
J2 - 2
J2 - 3
J2 - 4
J2 - 5
Table 2 – Inputs/Modes/Outputs Summary
MODE
Normal Fan
Normal Cool1
Normal Cool2
Normal Heat 1
Reheat Dehumidify
Subcool Cool1 and Cool2 /
Cir1/ Reheat Subcool-Dehumidify
Cir2
Subcool Cool1 and Cool2 /
Cir1 and Subcool-Dehumidify
Cir2
Heat Over- Heat 1
ride
Heat Over- Heat 1 and 2
ride
Unit
Connection
LTLO
CTB - REHEAT - 4
CTB - REHEAT - 5
CTB - REHEAT - 1
CTB - R
CTB - R
CTB - REHEAT - 7
CTB - HEAT - 6
CTB - REHEAT - 2
CTB - REHEAT - 8
FTP (BLK)
DSV
COMP COMP LSV
IFM
1 2 1
OFF OFF ON=G OFF
ON=Y OFF ON=G OFF
1
0N=Y2 ON ON=G OFF
OFF OFF ON=G OFF
ON ON ON=G ON
ON ON ON=G ON
ON ON ON=G ON
OFF OFF ON=G OFF
OFF OFF ON=G OFF
15
Note
2 - circ only
2 - circ only
2 - circ only
LSV
LSV2 DSV1 DSV2
NOT
OFF ON=R OFF OFF
OFF ON=R OFF OFF
OFF ON=R OFF OFF
OFF ON=R OFF OFF
ON OFF ON=R ON=R
ON OFF OFF ON=R
ON OFF OFF OFF
OFF ON=R OFF OFF
OFF ON=R OFF OFF