White Rogers 50A55-843 User Manual

TH
TR
MV
MV
GND
FP
HLO
HLI
PS
C
R
G
W
Y
EAC N
HUM N
XFMR N
LINE N
CIR N
IGN
IND
IGN N
IND N
HUM
EAC
XFMR
LINE
PARK
PARK
HEAT
COOL
IGNITOR
Y
W
G
R
THERMOSTAT
GAS
VALVE
HIGH LIMIT
(N. C.)
ROLLOUT
(N. C.)
AUX. HIGH
LIMIT (N. C.)
PRESSURE SWITCH (N. O.)
FLAME
SENSOR
PROBE
COMPRESSOR
CONTACTOR
ELECTRONIC
AIR CLEANER
HUMIDIFIER
INDUCER
CIRCULATOR
BLOWER
50A55
24 VAC
120 VAC
24 VAC CLASS II
TRANSFORMER
HOT
(LINE)
NEUTRAL
(LINE)
TH TR
Low Voltage (24 VAC)
Line Voltage (120 VAC)
LEGEND
N. C. = Normally closed switch
N. O. = Normally open switch
RO1
RO2
TYPICAL SYSTEM WIRING DIAGRAM
TWIN*TWIN*
50A55-843
in other
furnace(s)
—
TWINNING
APPLICATIONS
ONLY
50A55-843
WIRING AND
CONFIGURATION
Flame Current Requirements:
0LQLPXPFXUUHQWWRLQVXUHÀDPHGHWHFWLRQ.............1 µa DC➀
Maximum current for non-detection .....................0.1 µa DC➀
0D[LPXPDOORZDEOHOHDNDJHUHVLVWDQFH ............. 100 M ohms
Flame establishing time ......................0.8 seconds maximum
Flame failure response time ...............2.0 seconds maximum
➀ 0HDVXUHGZLWKD'&PLFURDPPHWHULQWKHÀDPHSUREHOHDG
50A55-843
www.white-rodgers.com
183
TECHNICAL HELP

White Rogers 50A55-843 Specifications

General

Type	Integrated Furnace Control
Stages of Heating	1
Stages of Cooling	1
Voltage	24V
Frequency	60 Hz
Flame Sense	Yes
Material	Plastic

Summary

Typical System Wiring Diagram

Legend

Explains symbols used in the wiring diagram for easy interpretation.

Flame Current Requirements

Specifies minimum/maximum current for flame detection and response times.

50A55-843 Control Overview

Option Switches

Details the function and settings of option switches for controlling delay periods.

Heat Mode Operation

Explains the heating sequence, ignitor warm-up, and flame detection process.

Cool Mode Operation

Describes the cooling sequence, including compressor and fan operation.

Manual Fan On Mode

Explains how to operate the circulator fan manually.

System Lockout Features

Covers conditions for system lockout and methods to reset the control.

Diagnostic Features

Details the LED indicators and flash codes for system status and failures.