Electrical Controls And Wiring; Refrigerant Circuit - Bryant 574B Installation Instructions Manual

SET-UP INSTRUCTIONS FOR EASY SELECT BOARD
(SUPER HUMIDITY CONTROL IN COOLING)
9 PIN CONNECTOR
ECM PRINTED CIRCUIT BOARD
SEC1 SEC 2
EASY SELECT
GAS HEAT / CFM
130 115
1800 1600
A
VIO
AC/HP SIZE
060 048
B
BLU
SYSTEM TYPE
AC HP-COMFOR T
C
OR N
AC/HP CFM ADJUST
NOM LO
D
BLK
ON/OFF DELAY
0 30
E
90 90
WHT
CONTINUOUS FAN
LO MED
F
YEL
HEATER/MOTOR
12 PIN CONNECTOR
4. If fan needs to be removed, loosen the setscrew and slide
the fan off the motor shaft.
5. When replacing fan blade, position blade so the hub is 1/8
in. away from the motor end (1/8 in. of motor shaft will be
visible, See Fig. 15).
6. Ensure that setscrew engages the flat area on the motor
shaft when tightening.
7. Replace grille.

ELECTRICAL CONTROLS AND WIRING

Inspect and check the electrical controls and wiring annually. Be
sure to turn off the gas supply, and then the electrical power to the
unit.
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed, disassemble the connection, clean all the parts, re- -strip
the wire end and reassemble the connection properly and
securely.
After inspecting the electrical controls and wiring, replace the
access panel. Start the unit, and observe at least one complete
heating cycle and one complete cooling cycle to ensure proper
operation. If discrepancies are observed in either or both
operating cycles, or if a suspected malfunction has occurred,
check each electrical component with the proper electrical
QUICK REFERENCE GUIDE
J1
TM
090 060
1250 1000
042 036
D
H
HP-EFF
R
W
1
W
2
HI
Y
1
Y/Y
2
G
J2 O
0
EN H C
0
AUX1 HUM1
HI YEL
AUX2 HUM2
24V AC
GR Y
ECM ID Blower Motor- -quick Reference Guide
EASY SELECT BOARD
1. Configuration Taps
(See Installation Instructions, for detailed description)
A. HEAT RANGE - Set for gas heat size
B. AC/HP SIZE - Set for size of outdoor unit (Cooling Size)
C. SYSTEM TYPE - Select "AC" for Gas Package Units
D. AC/HP CFM ADJUST - Select "NOM"
E. ON/OFF DELAY - Do not use "ENH" for this unit
F. CONTINUOUS FAN - Select desired speed
2. Remove Jumper J1 to activate all dehumidify modes
3. Complete wiring and install outdoor temperature
sensor according to Installation Instructions
THERMIDISTAT CONTROL SETTINGS
1. Set "DIP Switches" - Set the dip switches (back of
Thermidistat Control Board) appropriately for specific
system being installed.
2. Thermidistat Control Configurations
(See Thermidistat Control Installation Instructions for detailed description)
* Option 5 (Variable Speed Indoor Motor) - Set to ON
* Option 7 (Super Dehumidify) - Set to ON
* Option 17 - Select Programmable or non-programmable mode.
3. Set desired humidity level on fron of Thermidistat
(50 to 55 % RH recommended). For dehumidification in
cooling, both "dhu" and "cool" must be displayed.
instrumentation. Refer to the unit wiring label when making these
checkouts.
NOTE:
Refer to the heating and/or cooling sequence of
operation in this publication as an aid in determining proper
control operation

REFRIGERANT CIRCUIT

Annually inspect all refrigerant tubing connections and the unit
base for oil accumulations. Detecting oil generally indicates a
refrigerant leak.
WARNING
!
EXPLOSION, PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use all
service ports and open all flow- -control devices, including
solenoid valves.
If oil is detected or if low cooling performance is suspected,
leak- -test all refrigerant tubing using an electronic leak- -detector,
halide torch, or liquid- -soap solution. If a refrigerant leak is
detected, refer to the Check for Refrigerant Leaks section.
25
(EX: 090 for unit 048090---)
C01034G