Carrier 48HC D17 Series, Service And Maintenance Instructions

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Fig. 19 -- Humidi--MiZer Reheat Control Board I/O
Point Name Type Connection
Pin Number
Unit
Connection
Note
Humidistat/LTLO DI, 24VAC J1A---1 (1) LTLO
Thermostat W1 DI, 24VAC J1A---2 (2) CTB---REHEAT---4
Econ Y1 DI, 24VAC J1A---6 (6) CTB---REHEAT---5
Thermostat G DI, 24VAC J1B---1 (7) CTB---REHEAT---1
24V Power (J1) 24VAC J1B---3 (9) CTB---R
24V Power (J2) 24 VAC J2---1 CTB---R
Econ Y2 DI, 24VAC J1B---5 (11) CTB---REHEAT---7 2---circ only
COMP1 DO, 24VAC J1A---5 (5) CTB---HEAT ---6
IFM DO, 24VAC J1B---4 (8) CTB---REHEAT---2
COMP2 DO, 24VAC J1B---4 (10) CTB---REHEAT---8
LSV DO, 24VAC J2---2 FTP (BLK)
DSV1 DO, 24VAC J2---3 DSV
NOT LSV DO, 24VAC J2---4 2---circ only
DSV2 DO, 24VAC J2---5 2---circ only
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) . .
Fig. 20 -- Inputs/Modes/Outputs Summary
Y1 Y2 W1 G HUM/
LTLO
MODE COMP1 COMP2 IFM LSV1 LSV2 LSV
NOT
DSV1 DSV2
OFF OFF OFF ON OFF Normal Fan OFF OFF ON=G OFF OFF ON=R OFF OFF
ON OFF OFF On OFF Normal Cool1 ON=Y1 OFF ON=G OFF OFF ON=R OFF OFF
ON ON OFF ON OFF Normal Cool2 0N=Y2 ON ON=G OFF OFF ON=R OFF OFF
OFF OFF ON X OFF Normal Heat 1 OFF OFF ON=G OFF OFF ON=R OFF OFF
OFF OFF OFF ON ON Reheat Dehumidify ON ON ON=G ON ON OFF ON=R ON=R
ON OFF OFF ON ON Subcool
Cir1/
Reheat
Cir2
Cool1 and
Cool2/Subcool---
Dehumidify
ON ON ON=G ON ON OFF OFF ON=R
ON ON OFF ON ON Subcool
Cir1 and
Cir2
Cool1 and
Cool2/Subcool---
Dehumidify
ON ON ON=G ON ON OFF OFF OFF
OFF OFF ON X ON Heat Over-
ride
Heat 1 OFF OFF ON=G OFF OFF ON=R OFF OFF
OFF OFF ON+
W2
X ON Heat Over-
ride
Heat 1 and 2 OFF OFF ON=G OFF OFF ON=R OFF OFF
48H
C