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WHITE-RODGERS | 50A55-474 & 50A55-571 |
Integrated Furnace Controls | |
INSTALLATION INSTRUCTIONS |
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 50A55-474 and 50A55-571 are automatic gas interrupted ignition controls that employ a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner, inducer, and fan.
Signals interpreted during continual surveillance of the thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shut-off during normal operation.
These controls incorporate system fault analysis for quick gas flow shut-off, coupled with automatic ignition retry upon sensing a fault correction.
PRECAUTIONS
! GENERAL PRECAUTION |
Application of this type of control may cause flame rollout on initial start-up and could cause personal injury and/or property damage.
Replace only with exact model number, including dash number. Failure to use exact replacement control could cause personal injury and/or property damage.
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.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and ordinances.
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
CONTENTS | |
Description ......................................................... | 1 |
Precautions ........................................................ | 1 |
Specifications ..................................................... | 2 |
Installation .......................................................... | 3 |
Mounting & Wiring | |
Operation ........................................................... | 6 |
! CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
This control is not intended for use in locations where it may come in contact with water. Suitable protection must be provided to shield the control from exposure to water (dripping, spraying, rain, etc.).
!WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.
WHITE-RODGERS DIVISION | PART NO. 37-5800C | |
EMERSON ELECTRIC CO. | ||
9797 REAVIS ROAD | Printed in U.S.A. | Replaces 37-5800B |
ST. LOUIS, MISSOURI 63123-5398 | 9751 |
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77°F (25°C)]: Input Voltage: 25 VAC 50/60 Hz
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)
Flame Current Requirements:
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
*Measured with a DC microammeter in the flame probe lead
OPERATING TEMPERATURE RANGE:
-40°to 175°F (-40°to 80°C)
HUMIDITY RANGE:
5% to 93% relative humidity (non-condensing)
MOUNTING:
Surface mount multipoise | |
Timing Specs: (@ 60 Hz**) | |
maximum | |
Flame Establishing Time: | 0.8 sec |
Flame Failure Response Time: | 2.0 sec |
**At 50 Hz, all timing specifications should be increased by 20%.
Gases Approved: Natural, Manufactured, Mixed, Liquified Petroleum, and LP Gas Air Mixtures are all approved for use.
TIMING SPECIFICATIONS
(All times are in seconds, unless noted otherwise)
50A55-474 | 50A55-571 | |
PRE-PURGE | 0 | 0 |
TRIAL FOR IGNITION | 4 | 4 |
PERIOD | ||
IGNITION ACTIVATION | 1 | 1 |
PERIOD | ||
RETRIES | 2 times | 2 times |
VALVE SEQUENCE | 12 | 12 |
PERIOD | ||
INTERPURGE | 60 | 60 |
POST-PURGE | 5 | 5 |
LOCKOUT TIME | 300 | 300 |
DELAY TO HEAT ON | 45 | 45 |
DELAY TO HEAT OFF | 60/100/ | 100 |
140/180* | ||
DELAY TO COOL ON | 2 | 2 |
DELAY TO COOL OFF | 0/80* | 0/80† |
MINIMUM IGNITOR | 11 | 11 |
WARM-UP | ||
MAXIMUM IGNITOR | 21 | 21 |
WARM-UP | ||
INITIAL IGNITOR | 17 | 17 |
WARM-UP (1st 64 | ||
attempts) | ||
HUMIDIFIER | YES | NO |
ELECTRONIC AIR | YES | NO |
CLEANER |
*These times will vary depending on option switch position. The control is factory-set at 0 sec. delay to cool off and 100 sec. delay to heat off. See OPERATION section for further information.
†This time will vary depending on the condition of the jumper. With the jumper installed, the delay-to- cool-off is set at 0 seconds. To obtain an 80second delay-to-cool-off, clip the jumper wire and separate the jumper legs.
MOUNTING AND WIRING
!WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
! CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. Failure to earth ground the appliance or reversing the neutral and hot wire connection to the line can cause shock hazard.
Shut off main gas to heating system until installation is complete.
White Rodgers 50a50 241 Troubleshooting
Route and secure all wiring as far from flame as practical to prevent fire and/or equipment damage.
INSTALLATION
NOTE
All wiring should be installed according to local and national electrical codes and ordinances.
The control must be secured to an area that will experience a minimum of vibration and remain below the maximum ambient temperature rating of 175°F. The control is approved for minimum ambient temperatures of -40°F.
Any orientation is acceptable.
Refer to the wiring diagram and wiring table when connecting the 50A55 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. Refer to 50A55 specification sheet for recommended terminals to mate with those on the control.
UL approved 105°C rated 16 gauge min., stranded, 4⁄64” thick insulation wire is recommended for all line voltage connections. Refer to 50A55 specification sheet for recommended terminals to mate with those on the control.
The 50A55 has only one serviceable part–an automotive type fuse, which protects the low voltage transformer from damage if its 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 is not the cause of the control’s problem, replace the entire 50A55 control. There are no other user serviceable parts.
Did you lose a service manual for a White Rodgers Thermostat device? Do you have any other problem with it? You got to the right place. There is White Rodgers thermostat troubleshooting table below. It allows to conduct timely diagnostics of an appliance and remove defects.
White Rodgers 50a50 241 Manual
White Rodgers 1 F 78 thermostat troubleshooting
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No Heat/No Cool/No Fan (common problems) | 1. Blown fuse or tripped circuit breaker. | Replace fuse or reset breaker. |
| 2. Furnace power switch to OFF. | Turn switch to ON. | |
| 3. Furnace blower compartment door or panel loose or not properly installed. | Replace door panel in proper position to engage safety interlock or door switch. | |
| 4. Loose connection to thermostat or system. | Tighten connections. | |
| No Heat | 1. Pilot light not lit. | Re-light pilot. |
| 2. Furnace Lock-Out Condition. Heat may also be intermittent. | Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local HVAC service person for assistance. | |
| 3. Heating system requires service or thermostat requires replacement. | Diagnostic: Set SYSTEM Switch to HEAT and raise the setpoint above room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a HVAC service person to verify the heating is operating correctly. | |
| No Cool | 1. Cooling system requires service or thermostat requires replacement. | Same as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling. |
| Heat, Cool or Fan Runs Constantly | 1. Possible short in wiring. 2. Possible short in thermostat. 3. Possible short in heat/cool/fan system. 4. FAN Switch set to Fan ON. | Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal block. Try resetting the thermostat as described above. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat. |
| Thermostat Setting & Thermostat Thermometer Disagree | 1. Thermostat thermometer setting requires adjustment. | The thermometer can be adjusted +/- 4 degrees. See Temperature Display Adjustment in the Configuration Menu section. |
| Furnace (Air Conditioner) Cycles Too Fast or Too Slow (narrow or wide temperature swing) | 1. The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate. | Digital thermostats provide precise control and cycle faster than older mechanical models. The system turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like an increased cycle time, choose SL for slow cyde in the Configuration menu, step 6 (heat) or 7 (cool). If an acceptable cycle rate is not achieved, contact a local HVAC service person for additional suggestions. |
| Forgot Keypad Lockout Code | Press the menu button (button will disappear) and hold in for 20 seconds. This unlocks the thermostat. |
White Rodgers BNP125 thermostat troubleshooting
| Problem | Solution |
|---|---|
| The thermostat is hot. | In normal operating conditions, the thermostat housing can reach nearly 40?C at maximum load. That is normal and will not affect the effective operation of the thermostat. |
| Heating is always on. | Check if the thermostat is properly connected. |
| Heating does not run even if the thermostat indicates it is on. | |
| The display does not turn on. | Check if the thermostat is properly connected. |
| The display turns off a few minutes and then turns on again. | The thermal protection of the heating unit has opened due to overheating. Check if the heating unit is in good condition of operation and that clearance around the appliance is according to the manufacturer’s specifications. |
| The display has low contrast when heating is on. | The load is lower than the minimum load. Install a heating unit that is within the load limits of the thermostat. |
| The displayed ambient temperature is incorrect. | Check the presence of an air stream or a heat source near the thermostat, and correct the situation. |
| The display indicates E1 or E2. | Faulty thermal sensor. Contact the customer service. |
| Weak luminosity of the display. | Possibility of a bad contact. Check thermostat wirings. |
White Rodgers P200 thermostat troubleshooting
| Options | Default Setting | Additional Information |
|---|---|---|
| Set the temporary Hold Time (HOLD) | 00:00 | Select desired time, in 15-minute increments, for the duration of a temporary override of the current temperature. If you are not sure what to chose, 2 hour setting is usually a good starting point. |
| Do you want the Cycle Rate to be Fast or Slow? | FA (fast) | Select SL (slow) if you have Hydronic (water or steam) heating. Otherwise, select default FA. |
| Do you want the display light on (d-L) for a short time after any key is pressed? | ON | Use default ON to enable backlight |
| Do you want the Energy Management Recovery(E) function to be enabled? | ON (enabled) | Select default ON. |
| Ensures the desired temperature is reached by the designated program schedule time | ||
| Do you want to be reminded when it is time to change the air filter? (FLTR) | 000 (no reminder) | Select default 000 for now. |
| Compressor Lockout (LOC) | OFF | Select ON to provide protection to your Heating and Cooling System’s compressor |
| How much displayed temperature offset do you want? | OHI (no offset) | Select default OHI for now. |
| Do you want temperature displayed in ?C (Celsius) or ?F (Fahrenheit)? | ?F (Fahrenheit) |