Carrier WeatherMaker 48TC Series Service And Maintenance Instructions page 13

POINT NAME
Humidistat/LTLO
Thermostat W1
Econ Y1
Thermostat G
24V Power (J1)
24V Power (J2)
Econ Y2
COMP1
IFM
COMP2
LSV
DSV1
NOT LSV
DSV2
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)
INPUT
Y1 Y2 W1 G
OFF OFF OFF ON
ON OFF OFF On
ON ON OFF ON
OFF OFF ON X
OFF OFF OFF ON
ON OFF OFF ON
ON ON OFF ON
OFF OFF ON X
ON+
OFF OFF X
W2
Table 2 — Humidi-MiZer Reheat Control Board I/O
CONNECTION PIN
TYPE
DI, 24VAC
DI, 24VAC
DI, 24VAC
DI, 24VAC
24VAC
24 VAC J2 - 1
DI, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
Table 3 — Inputs/Modes/Outputs Summary
MODE
HUM/
LTLO
OFF Normal
OFF Normal Cool1
OFF Normal Cool2
OFF Normal Heat 1
ON Reheat Dehumidify
Subcool Cir1/ Cool1 and Cool2 /
ON
Reheat Cir2 Subcool-Dehumidify
Subcool Cir1 Cool1 and Cool2 /
ON
and Cir2 Subcool-Dehumidify
ON Heat Override Heat 1
ON Heat Override Heat 1 and 2
UNIT CONNECTION
NUMBER
J1A - 1 (1)
J1A - 2 (2) CTB - REHEAT - 4
J1A - 6 (6) CTB - REHEAT - 5
J1B - 1 (7) CTB - REHEAT - 1
J1B - 3 (9)
CTB - R
J1B - 5 (11) CTB - REHEAT - 7
J1A - 5 (5) CTB - HEAT - 6
J1B - 4 (8) CTB - REHEAT - 2
J1B - 4 (10) CTB - REHEAT - 8
J2 - 2
J2 - 3
J2 - 4
J2 - 5
COMP COMP
1 2
Fan OFF OFF
ON=Y1 OFF
ON=Y2 ON
OFF OFF
ON ON
ON ON
ON ON
OFF OFF
OFF OFF
13
LTLO
CTB - R
FTP (BLK)
DSV
OUTPUT
LSV
IFM LSV1 LSV2
NOT
ON=G OFF OFF ON=R
ON=G OFF OFF ON=R
ON=G OFF OFF ON=R
ON=G OFF OFF ON=R
ON=G ON ON OFF
ON=G ON ON OFF
ON=G ON ON OFF
ON=G OFF OFF ON=R
ON=G OFF OFF ON=R
NOTE
2 - circ only
2 - circ only
2 - circ only
DSV1 DSV2
OFF OFF
OFF OFF
OFF OFF
OFF OFF
ON=R ON=R
OFF ON=R
OFF OFF
OFF OFF
OFF OFF