Carrier 48HC D17 Series Service And Maintenance Instructions page 16

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)
Y1 Y2 W1 G HUM/
LTLO
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
Fig. 19 - - Humidi- - MiZer Reheat Control Board I/O
Type Connection
Pin Number
DI, 24VAC J1A ---1 (1)
DI, 24VAC J1A ---2 (2)
DI, 24VAC J1A ---6 (6)
DI, 24VAC J1B---1 (7)
24VAC J1B---3 (9)
24 VAC J2---1
DI, 24VAC J1B---5 (11)
DO, 24VAC J1A ---5 (5)
DO, 24VAC J1B---4 (8)
DO, 24VAC J1B---4 (10)
DO, 24VAC J2---2
DO, 24VAC J2---3
DO, 24VAC J2---4
DO, 24VAC J2---5
Fig. 20 - - Inputs/Modes/Outputs Summary
MODE COMP1
Normal Fan OFF
Normal Cool1 ON=Y1
Normal Cool2 0N=Y2
Normal Heat 1 OFF
Reheat Dehumidify
Subcool Cool1 and
Cir1/ Cool2/Subcool---
Reheat Dehumidify
Cir2
Subcool Cool1 and
Cir1 and Cool2/Subcool---
Cir2 Dehumidify
Heat Over- Heat 1 OFF
ride
Heat Over- Heat 1 and 2 OFF
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
COMP2 IFM LSV1
OFF ON=G OFF
OFF ON=G OFF
ON ON=G OFF
OFF ON=G OFF
ON ON ON=G ON
ON ON ON=G ON
ON ON ON=G ON
OFF ON=G OFF
OFF ON=G OFF
16
Note
2---circ only
2---circ only
2---circ only
LSV2 LSV 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