Emerson 50M56 7433 Thermostat User Manual

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5
0M56-743  
Integrated Single or Two-Stage  
HSI Integrated Furnace Control Kit  
INSTALLATION INSTRUCTIONS  
Operator: Save these instructions for future use!  
FAILURETO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE  
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL  
INJURY AND/OR PROPERTY DAMAGE.  
DESCRIPTION  
The 50M56-743 kit is an automatic gas HSI Integrated Fur-  
nace Control that employs a microprocessor to continually  
monitor, analyze, and control the proper operation of the gas  
burner, inducer, and fan.  
5
0M56-743 Cross Reference Information  
Goodman White-Rodgers  
0130F00006  
PCBBF122  
PCBBF122S  
PCBBF132  
PCBBF132S  
50M56 289  
Signals interpreted during continual surveillance of the ther-  
mostat and flame sensing element initiate automatic ignition  
of the burner, sensing of the flame, and system shut-off during  
normal operation.  
0130F00006S  
PCB00109  
PCBBF109  
These controls incorporate system fault analysis for quick gas  
flow shut-off, coupled with automatic ignition retry upon sensing  
a fault correction.  
PRECAUTIONS  
Installation should be done by a qualified heating and air  
conditioning contractor or licensed electrician.  
WARNING  
!
If in doubt about whether your wiring is millivolt, line, or low  
voltage, have it inspected by a qualified heating and air  
conditioning contractor or licensed electrician.  
Failure to comply with the following warnings could result  
in personal injury or property damage.  
Do not exceed the specification ratings.  
FIRE HAZARD  
All wiring must conform to local and national electrical codes  
and ordinances.  
Do not exceed the specified voltage.  
Replace existing control with exact model and  
dash number.  
This control is a precision instrument, and should be handled  
carefully. Rough handling or distorting components could  
cause the control to malfunction.  
Protect the control from direct contact with water  
(
dripping, spraying, rain, etc.).  
Following installation or replacement, follow manufacturer’s  
recommended installation/service instructions to ensure  
proper operation.  
• If the control has been in direct contact with  
water, replace the control.  
• Label all wires before disconnection when  
servicing controls. Wiring errors can cause  
improper and dangerous operation.  
CAUTION  
!
Route and secure wiring away from flame.  
Do not short out terminals on gas valve or primary  
control. Short or incorrect wiring may damage the  
thermostat.  
SHOCK HAZARD  
Disconnect electric power before servicing.  
Ensure proper earth grounding of appliance.  
Ensure proper connection of line neutral and line  
hot wires.  
CONTENTS  
Description................................................................... 1  
Precautions.................................................................. 1  
Specifications .............................................................. 2  
Installation ................................................................... 3  
Mounting & Wiring  
EXPLOSION HAZARD  
Shut off main gas to appliance until installation  
is complete.  
Operation..................................................................... 6  
System Lockout and Diagnostic Features ................... 7  
Troubleshooting ........................................................... 8  
PART NO. 37-7474A  
www.white-rodgers.com  
www.emersonclimate.com  
1314  
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SPECIFICATIONS  
ELECTRICAL RATINGS [@ 77°F (25°C)]:  
OPERATING TEMPERATURE RANGE:  
40° to 176°F (-40° to 80°C)  
-
Input Voltage: 25 VAC 50/60 Hz  
HUMIDITY RANGE:  
Max. Input Current @ 25 VAC: 0.45 amp  
Relay Load Ratings:  
Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf  
Ignitor Relay:6.0 amp @ 120 VAC 50/60 Hz (resistive)  
MOUNTING:  
Surface mount multipoise  
Inducer Relay:  
2.2 FLA–3.5 LRA @ 120 VAC  
Timing Specs: (@ 60 Hz)  
Circulator Relay: 14.5 FLA–25.0 LRA @ 120 VAC  
maximum  
0.8 sec  
Flame Current Requirements:  
Flame Establishing Time:  
Minimum current to insure flame detection: 1 µa DC*  
Maximum current for non-detection: 0.1 µa DC*  
Maximum allowable leakage resistance: 100 M ohms  
Flame Failure Response Time:  
2.0 sec  
Gases Approved: Natural, Manufactured, Mixed, Liquified  
Petroleum, and LP Gas Air Mixtures are all approved for use.  
*
Measured with a DC microammeter in the flame probe lead  
TIMING SPECIFICATIONS  
All times are in seconds, unless noted otherwise  
Definition  
(
Event  
Pre-Purge  
50M56-743  
The period of time intended to allow for the dissipation of any unburned  
gas or residual products of combustion at the beginning of a furnace  
operating cycle prior to initiating ignition  
30  
Trial for Ignition  
Period (TFI)  
The period of time between initiation of gas flow and the action to  
shut off the gas flow in the event of failure to establish proof of the  
supervised ignition source or the supervised main burner flame.  
The period of time between energizing the main gas valve and  
deactivation of the ignition means prior to the end of TFI  
4
Ignition Activation  
Period (IAP)  
Retries  
2
The additional attempts within the same thermostat cycle for ignition  
when the supervised main burner flame is not proven within the first  
trial for ignition period.  
2 times  
Recycles  
The additional attempts within the same thermostat cycle for ignition  
after loss of the supervised ignition source or the supervised main  
burner flame.  
3
Valve Sequence  
Period  
Interpurge  
Valve sequence period equals 4 seconds trial for ignition period x  
12  
60  
(
1 initial try + 2 retries) + 12 seconds.  
The period of time intended to allow for the dissipation of any unburned  
gas or residual products of combustion between the failed trial for  
ignition and the retry period.  
Post-Purge  
The period of time intended to allow for the dissipation of any unburned  
gas or residual products of combustion at the end of a furnace burner  
operating cycle. Post-purge begins at the loss of flame sense.  
ANSI standard rated module timing.  
25  
Lockout Time  
275  
30  
Heat Delay-To-Fan-On The period of time between proof of the supervised main burner flame  
and the activation of the blower motor at Heat speed.  
Heat Delay-To-Fan-Off* The period of time between the loss of a call for heat and the  
deactivation of the blower motor at Heat speed.  
100/150*  
Cool Delay-To-Fan-On The period of time after a thermostat demand for cool before energizing  
the circulator blower motor at Cool speed.  
6
Cool Delay-To-Fan-Off* The period of time between the loss of a call for cool and the  
deactivation of the blower motor at Cool speed.  
45  
17  
Ignitor Warm-up  
1st 64 attempts)  
The length of time allowed for the igniter to heat up prior to the initiation  
of gas flow.  
(
Maximum Ignitor  
Warm-up  
In the event of a retry, the warm-up time will be increased by one  
second, up to a maximum of 19 seconds, and locked at that duration  
19  
Auto Reset  
After one (1) hour of internal or external lockout, the control will auto-  
matically reset itself and go into an auto restart purge for 60 seconds.  
60 minutes  
Yes  
Electronic Air Cleaner  
*
This time will vary depending on option switch position. The control is factory set at 150 seconds HEAT  
delay-to-fan-off. See OPERATION section for further information  
2
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INSTALLATION  
MOUNTING AND WIRING  
All wiring should be installed by a qualified heating and air  
conditioning contractor or licensed electrician, according to  
local and national electrical codes and ordinances.  
WARNING  
!
FIRE HAZARD  
The control must be secured to an area that will experience a  
minimum of vibration and remain below the maximum ambient  
temperature rating of 176°F. The control is approved for  
minimum ambient temperatures of -40°F.  
Do not exceed the specified voltage.  
Replace existing control with exact model and  
dash number.  
Protect the control from direct contact with water  
dripping, spraying, rain, etc.).  
If the control has been in direct contact with  
water, replace the control.  
Label all wires before disconnection when serv-  
icing controls. Wiring errors can cause improper  
and dangerous operation.  
(
When mounting the control, any orientation is acceptable.  
Refer to the wiring diagram and wiring table when connecting  
the 50M56-743 control to other components of the system.  
UL approved, 105°C rated 18 gauge, stranded, 2/64” thick  
insulation wire is recommended for all low voltage safety circuit  
connections.  
Route and secure wiring away from flame.  
UL approved 105°C rated 16 gauge min., stranded, 4/64”  
thick insulation wire is recommended for all line voltage  
connections.  
SHOCK HAZARD  
Disconnect electric power before servicing.  
Ensure proper earth grounding of appliance.  
Ensure proper connection of line neutral and line  
hot wires.  
Afterinstallationorreplacement,followappliancemanufacturer’s  
recommended installation or service instructions to ensure  
proper operation.  
EXPLOSION HAZARD  
Shut off main gas to appliance until installation  
is complete.  
CAUTION  
!
Do not short out terminals on gas valve or primary  
control. Short or incorrect wiring may damage the  
thermostat.  
3
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WIRING  
TYPICAL SYSTEM WIRING DIAGRAM  
HOT  
LINE)  
NEUTRAL  
(LINE)  
(
1
20 VAC  
2
4 VAC CLASS II  
TRANSFORMER  
TH  
24 VAC  
TR  
5
0M56  
COOL  
LO HEAT  
HI HEAT  
LINE  
CIRCULATOR  
BLOWER  
XFMR  
EAC  
PARK  
PARK  
INDUCER  
IGNITOR  
IND-N  
IND  
IGN  
IGN-N  
4-Pin Connector]  
[
CIR N  
LINE N  
XFMR N  
EAC N  
ELECTRONIC  
AIR CLEANER  
Y
W
G
R
Y
W
G
COMPRESSOR  
CONTACTOR  
R
THERMOSTAT  
C
FLAME  
SENSOR  
PROBE  
FS  
PRESSURE SWITCH (N. O.)  
PSI  
PSO  
HLI  
HLO  
HIGH LIMIT  
N. C.)  
AUX. HIGH  
LIMIT (N. C.)  
RO OUT  
GND  
(
ROLLOUT  
N. C.)  
RO IN  
MV LO  
MV HI  
MV COM  
TR  
1
STAGE  
GAS  
VALVE  
2 STAGE  
GAS  
(
VALVE  
TH  
12-Pin Connector]  
[
LEGEND  
HLO  
PSO  
HLI  
PSI  
Low Voltage (24 VAC)  
Line Voltage (120 VAC)  
MV  
LO  
RO  
RO  
IN  
OUT  
GND  
IGN  
N
TH  
TR  
MV  
MV  
HI  
IND  
IGN  
IND  
N
COM  
N. C. = Normally closed switch  
N. O. = Normally open switch  
4
-Pin Connector  
12-Pin Connector  
4
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WIRING  
TYPICAL SYSTEM WIRING TABLE  
5
0M56  
TERMINAL  
SYSTEM COMPONENT  
CONNECTION  
TERMINAL  
TYPE  
W
G
R
Y
low voltage thermostat W terminal (or equivalent)  
low voltage thermostat G terminal (or equivalent)  
low voltage thermostat R terminal (or equivalent)  
low voltage thermostat Y terminal (or equivalent)  
Terminal  
block with  
captive  
(
2nd wire from Y terminal goes to 24 VAC HOT side of  
compressor contactor coil)  
screws  
C
HLO (Pin 1)  
MV LO (Pin 2)  
TH (Pin 3)  
PSO (Pin 4)  
RO OUT (Pin 5)  
TR (Pin 6)  
HLI (Pin 7)  
GND (Pin 8)  
MV COM (Pin 9)  
PSI (Pin 10)  
RO IN (Pin 11)  
MV HI (Pin 12)  
IND (Pin 1)  
IGN (Pin 2)  
IND-N (Pin 3)  
IGN-N (Pin 4)  
COOL  
24 VAC COMMON side of compressor contactor coil  
high limit OUTPUT  
gas valve first stage  
24 VAC transformer (low voltage HIGH side)  
pressure switch OUTPUT  
rollout switch OUTPUT  
HLO  
PSO  
HLI  
PSI  
24 VAC transformer (low voltage COMMON side)  
high limit INPUT  
MV  
LO  
RO  
RO  
IN  
GND  
OUT  
MUST BE RELIABLY GROUNDED TO CHASSIS  
gas valve COMMON  
MV  
MV  
HI  
TH  
TR  
COM  
pressure switch INPUT  
rollout switch INPUT  
gas valve second stage  
inducer HOT side  
ignitor HOT side  
IND  
N
IGN  
N
IND  
IGN  
inducer NEUTRAL side  
ignitor NEUTRAL side  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
spade terminal  
circulator blower COOL SPEED terminal  
circulator blower LO HEAT SPEED terminal  
circulator blower HI HEAT SPEED terminal  
unused terminals  
LO HEAT  
HI HEAT  
PARK (2 terminals)  
LINE  
input voltage (120 VAC) HOT side  
24 VAC transformer line voltage HOT side  
electronic air cleaner HOT side  
circulator blower NEUTRAL terminal  
input voltage (120 VAC) NEUTRAL side  
24 VAC transformer line voltage NEUTRAL side  
electronic air cleaner NEUTRAL side  
flame sensor probe†  
XFMR  
EAC (optional)  
CIR N  
LINE N  
XFMR N  
EAC N (optional)  
FS  
Maximum recommended flame probe wire length is 36 inches.  
5
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OPERATION  
AUTO – On call for heat, the automatic second stage will  
determine the optimum timing between stages for comfort.  
Auto will adapt the delay to energize MV HI from instantly to  
up to 12 minutes.  
OPTION SWITCHES  
The option switches on the 50M56-743 control are used  
to determine the length of the heat delay-to-fan-off period,  
the mode of operation, and the 2nd stage delay period. The  
following illustration shows the options and the selections of When the thermostat is satisfied, the gas valve is de-energized.  
the switch positions. The switches are shown in the factory After proof of flame loss, the heat delay-to-fan-off period begins  
default positions.  
and the inducer blower remains energized to purge the system  
for 25 seconds.When the purge is complete, the inducer blower  
is de-energized. After the delay-to-fan-off period ends, the  
circulator fan and electronic air cleaner are de-energized.  
*
*
*
If flame is not detected, both valves are de-energized, the  
ignitor is turned off, and the 50M56-743 control goes into the  
MODE and 2ND STG DLY for Goodman 50M56-289 only  
retry” sequence. The “retry” sequence provides a 60-second  
HEAT MODE  
wait following an unsuccessful ignition attempt (flame not  
When heat is required, the thermostat will send a call for heat detected). After this wait, the ignition sequence is restarted  
to the control. This starts the control’s heating sequence. The with an additional 1 second of ignitor warm-up time.  
ignitor and humidifier (optional) are powered. The ignitor is  
powered after the pre-purge period.  
If flame is established for more than 10 seconds after ignition,  
the 50M56-743 controller will clear the ignition attempt (or  
Upon initial application of power, the ignitor warm-up time is 17 retry) counter. If flame is lost after 10 seconds, it will re-cycle  
seconds. The ignitor on-time will then be increased depending the ignition sequence.  
on whether or not flame is achieved. The warm-up time is  
During burner operation, a momentary loss of power of 50  
limited to a maximum of 19 seconds. During the first 64 warm-  
milliseconds or longer will de-energize the main gas valve.  
up periods following power-up, the warm-up time may not be  
When power is restored, the gas valve will remain de-energized  
less than 17 seconds.  
and a restart of the ignition sequence will begin immediately.  
In the event of a retry, the warm-up time will be increased by  
A momentary loss of gas supply, flame blowout, or a shorted or  
one second and locked in at that duration. Once the warm-up  
time is locked, it remains fixed until another call for heat results  
in a retry, in which case the warm-up time is again increased  
by one second and remains locked.  
open condition in the flame probe circuit will be sensed within  
2
.0 seconds. The gas valve will de-energize and the control  
will restart the ignition sequence. Recycles will begin and the  
burner will operate normally if the gas supply returns, or the  
In the event of two successive retry attempts, the warm-up fault condition is corrected.  
time will be unlocked and set to 19 seconds. If flame is then  
If the control has gone into system lockout, it may be possible  
to reset the control by a momentary power interruption of one  
second or longer. Refer to SYSTEM LOCKOUT FEATURES.  
achieved, the warm-up time will begin adapting again with the  
next call for heat. If, however, this third attempt fails to achieve  
flame, the control will go into system lockout.  
After the ignitor warm-up period, MV LO (first stage) and MV  
COOL MODE  
HI (second stage) are both energized to the gas valve. Flame In a typical system, a call for cool is initiated by closing the  
must be detected within 4 seconds. If flame is detected, the thermostat contacts. This energizes the 50M56-743 control  
3
0-second HEAT delay-to-fan-on period begins. The circulator and the compressor. The cool delay-to-fan-on period begins.  
and electronic air cleaner (optional) will also energize at this After the delay period ends, the optional electronic air cleaner  
time.  
is energized, and the circulator fan is energized at cool  
speed. After the thermostat is satisfied, the compressor is de-  
energized and the cool mode delay-to-fan-off period begins.  
After the delay-to-fan-off period ends, the circulator fan and  
electronic air cleaner (optional) are de-energized.  
1
Stage operation – If the Option Switch MODE (SW1-2) is  
set to the 1 STG position, both MV LO and MV HI will remain  
energized.  
2
Stage operation – If the Option Switch MODE is set to 2  
STG, MV HI will de-energize after 5 seconds, leaving MV LO  
energized. If the MODE is in the 2 STG position, 2nd STG DLY  
MANUAL FAN ON MODE  
If the thermostat fan switch is moved to the ON position, the  
circulator fan (low heat speed) and optional electronic air  
cleaner are energized. When the fan switch is returned to the  
AUTO position, the circulator fan and electronic air cleaner  
(
SW1-3) will determine the second stage- on delay as follows:  
MIN – On call for heat, the 5 minute 2nd stage recognition  
timer begins. After the 5-minute delay, the second stage heat  
MV HI) is energized.  
5
(
(
optional) are de-energized.  
6
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SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES  
SYSTEM LOCKOUT FEATURES  
FAULT RECALL  
When system lockout occurs, the gas valve is de-energized,  
the circulator blower is energized at heat speed, and, if flame  
is sensed, the inducer blower is energized. The diagnostic  
indicator light will flash or glow continuously to indicate  
system status. (System lockout will never override the  
precautionary features.)  
The last five fault codes stored can be displayed on the  
diagnostic LED. When the control is in standby mode (no  
call for heat or cool), press the FAULT RECALL switch for  
approximately two seconds or until the diagnostic LED turns  
off. Release the switch and the LED will remain off for two  
seconds. Then the fault codes will display beginning with the  
most recent fault first with a two second pause between codes.  
After the stored fault codes have all displayed, the LED will  
remain off for two seconds and then turn on to indicate return  
to normal status. While displaying the stored fault codes, the  
control will ignore any new call for heat, cool or fan.  
To reset the control after system lockout, do one of the  
following:  
1
.
Interrupt the call for heat or cool at the thermostat for at  
least one second but less than 20 seconds (if flame is  
sensed with the gas valve de-energized, interrupting the  
call for heat at the thermostat will not reset the control).  
FAULT CODE RESET  
2
3
.
.
Interrupt the 24 VAC power at the control for at least one  
second. You may also need to reset the flame rollout The stored fault codes can be erased from memory. When  
sensor switch.  
the control is in standby mode (no call for heat or cool), press  
After one hour in lockout, the control will automatically the FAULT RECALL switch for five to ten seconds or until  
reset itself.  
the diagnostic LED begins to rapid flash. When the switch is  
released, the LED will turn off for two seconds to indicate the  
codes are erased. After two seconds the LED will turn on to  
indicate return to normal status. If the switch is held pressed  
for over ten seconds the rapid flash will stop and the LED will  
be on to indicate return to normal status.  
DIAGNOSTIC FEATURES  
The 50M56-743 control continuously monitors its own  
operation and the operation of the system. If a failure occurs,  
the LED will indicate a failure code as shown on page 8. If  
the failure is internal to the control, the LED will stay off  
or flash 8 times. In this case, the entire control should be  
replaced, as the control is not field-repairable.  
The 50M56-743 has only one serviceable part –an automotive  
type fuse, which protects the low voltage transformer from  
damage if the output is short-circuited. If the fuse has opened  
up, remove whatever caused the short circuit and replace the  
fuse with only a 3 Amp automotive type fuse. If the fuse does  
not correct the condition, replace the entire 50M56-743 control.  
There are no other user serviceable parts.  
Failure codes will flash the LED in the following flash-  
pause sequences to indicate failure status (each flash will  
last approximately 0.25 seconds, and each pause will last  
approximately 2 seconds).  
7
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TROUBLESHOOTING  
Red LED  
Flash  
Error/Condition  
External lockout  
exceeded retries)  
Comments/Troubleshooting  
1
Failure to sense flame is often caused by carbon deposits on the flame  
sensor, a disconnected or shorted flame sensor lead or a poorly grounded  
furnace. Carbon deposits can be cleaned with emery cloth. Verify sensor is  
not contacting the burner and is located in a good position to sense flame.  
(
Ignitor must be positioned to light the gas immediately when the valve  
opens. If the ignitor has been replaced, verify hot spot position has not  
changed.  
Check sensor lead for shorting and verify furnace is grounded properly.  
Verify gas supply to valve, gas valve in "On" position and appliance  
lighting properly. Verify flame reaches flame sensor during ignition  
attempts and gas pressures are correct.  
2
3
Pressure switch stuck  
closed  
Pressure switch stuck closed. Check switch function, verify inducer is  
turning off. Refer to wiring diagram, terminals PSI / PSO.  
Pressure switch stuck  
open  
Check pressure switch function and tubing. Verify inducer is turning on  
and pulling sufficient vacuum to engage switch. Refer to wiring diagram,  
terminals PSI / PSO.  
4
5
Open high temperature  
limit switch  
Verify continuity through limit switch circuit. Refer to wiring diagram  
terminals, HLI / HLO.  
Flame sensed with gas  
valve  
de-energized  
Verify the gas valve is operating and shutting down properly. Flame in  
burner assembly should extinguish promptly at the end of the cycle. Check  
orifices and gas pressure.  
6
7
Open rollout switch  
Verify continuity through rollout switch circuit. Refer to wiring diagram  
terminals, RO IN / RO OUT.  
Low flame sense current  
Low flame sense current is often caused by carbon deposits on the flame  
sensor, a poorly grounded furnace or a mis-aligned flame sense probe.  
Carbon deposits can be cleaned with emery cloth.  
Check or improve furnace and module ground. Verify sensor is located in  
or very near flame as specified by the appliance manufacturer. Refer to  
wiring diagram FS terminal and GND.  
8
Ignitor relay fault  
Reversed polarity  
This flash code does not indicate a broken, disconnected or shorted  
ignitor. It indicates the ignitor relay contacts on the ignition module are not  
functioning properly. Replace the ignition module.  
Rapid Flash  
Verify the control and furnace are properly grounded. Check and reverse  
polarity (primary or secondary) if incorrect.  
Continuous On  
Off  
Normal operation  
Control failure  
No fault  
Verify power to the control, replace control if power is at the control and no  
lit Red LED  
HOMEOWNER HELP LINE: 1-800-284-2925  
White-Rodgers is a business  
of Emerson Electric Co.  
The Emerson logo is a  
trademark and service mark  
of Emerson Electric Co.  
www.white-rodgers.com  
www.emersonclimate.com  

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