Bryant Preferred 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
Y1 Y2 W1 G HUM/LTLO
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
OFF OFF ON+W2 X
PROBLEM
Subcooling Reheat Mode Will Not
Activate
Hot Gas Reheat Mode Will Not
Activate
Table 2 — Perfect Humidity Reheat Control Board I/O
TYPE CONNECTION PIN NUMBER
DI, 24VAC
DI, 24VAC
DI, 24VAC
DI, 24VAC
24VAC
24VAC
DI, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
DO, 24VAC
Table 3 — Inputs/Modes/Outputs Summary
MODE
OFF Normal
OFF Normal
OFF Normal
OFF Normal
ON Reheat Dehumidify
Cool1 and
Subcool Cir1/
ON Cool2/Subcool-
Reheat Cir2
Dehumidify
Cool1 and
Subcool Cir1
ON Cool2/Subcool-
and Cir2
Dehumidify
ON Heat Override
ON Heat Override Heat 1 and 2
Table 4 — Perfect Humidity Troubleshooting
CAUSE
General cooling mode problem.
No dehumidification demand.
CRC relay operation.
Circuit RLV, CLV or LDV valve problem.
General cooling mode problem.
No dehumidification demand.
CRC relay operation.
Circuit RLV, CLV or LDV valve problem.
Circuit RDV valve is not open.
Outdoor temperature too low.
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
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)
COMP1 COMP2
Fan OFF OFF
Cool1 ON=Y1 OFF
Cool2 ON=Y2 ON
Heat 1 OFF OFF
ON ON
ON ON
ON ON
Heat 1 OFF OFF
OFF OFF
See Cooling Service Troubleshooting (Table 5).
See No Dehumidification Demand, below.
See CRC Relay Operation, below.
See CLV, RLV or LDV Valve Operation, below.
See Cooling Service Troubleshooting (Table 5).
See No Dehumidification Demand, below.
See CRC Relay Operation, below.
See CLV, RLV or LDV Valve Operation, below.
See RDV Valve Operation, below.
Check Reheat2 Circuit Limit Temperatures
(ConfigurationHMZRRA.LO and RB.LO) using
ComfortLink Scrolling Marquee.
13
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
IFM LSV1 LSV2 LSV 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
REMEDY
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