Atwood Hydro Flame 31501 Ignition Control, Direct Spark with Remote Sense.

Fenwal 35-535911-113

12 VDC Gas Ignition Drop-in Replacement Kit
For Atwood Hydroflame Furnaces
Ref. Atwood 31501 Kit

The Fenwal 35-535911-113 is a 12 VDC Direct Spark Ignition Control designed for use in Atwood RV gas furnaces. The control utilizes a microprocessor to continually and safely monitor, analyze and control the proper operation of the gas burner. Integrated combustion blower control provides automatic backward compatibility with older models.

• Certified to ANSI Z21.20-1998 and CAN/CSA C22.2 No. 199-M89
• Recognized to UL372 – Software conforms to UL1998

This kit includes the genuine Fenwal OEM control and is a direct substitute for Atwood furnace board kit 31501. The control board carries UL and CSA certification listings, unlike other aftermarket replacement controls that have limited or no safety agency certifications.

Item Description	Part Number	Atwood #
Control, Gas Ignition	35-535911-113	33488
Board, Adapter	06-220041-001	33727
Installation Instructions and Warranty	06-237326-001	N/A

Adapter board 33727 makes this kit compatible with pre-2004 furnaces using Atwood Edge Connector style board 37875.

Fenwal Gas Ignition boards must be installed by a certified technician only. Follow installation instructions exactly.

INPUT VOLTAGES	DESCRIPTION
Input Power	Control:9.0to15VDCfromastorage batteryorRVpowerconverter
Input Current Drain	300 mA @ 12 VDC, combustion blower andgas valve relays energized (control only)
Gas Valve Rating	1.0A @ 12 VDC
Combustion Blower Rating	20.0A @ 12 VDC
Operating Temperatue	-40°F to +176°F ( -40°C to +80°C)
Flame Sensitivity	0.7μA minimum
Flame Failure Response Time	0.8 seconds maximum
Types of Gases	Natural, LP, or manufactured
Spark Rate	16 sparks per second
Size (LxWxH)	4.25 x 3.25 x 1.80 inches10.80 x 8.25 x 4.57 cm
Enclosure	Uncovered with integral standoffs
Moisture Resistance	Conformalcoatedtooperateto95% R.H.(Non-Condensing) Alwaysavoiddirectexposuretowater.
Tries for Ignition	three
Trial for Ignition Period	7 seconds
Prepurge & Inter-purge Timings	15 seconds
Postpurge Timings	90 seconds

• Certified to ANSI Z21.20-1998 and CAN/CSA C22.2 No. 199-M89
• Recognized to UL372 – Software conforms to UL1998

Troubleshooting

Warning!Risk of Explosion or Fire

The Fenwal 35-535911-113 control cannot be serviced by the user. If any control faults are detected, the Fenwal 35-535911-113 control must be replaced by qualified service personnel. Risk of explosion or fire can result if the control module has been opened or with any attempts to repair it, and the warranty is void

Before troubleshooting the system, check the following items:

• Verify all mechanical and electrical connections are secure and tight.
• Verify all system wiring is correct.
• Verify there is a proper system ground. The igniter, flame sensor, and ignition module must share a common ground with the burner. Nuisance shutdowns are often caused by a poor or erratic ground.
• Perform the instructions in “Checkout” on page 3, as the first step in any troubleshooting.
• Verify that the system is powered and that the thermostat is calling for heat.
• If the control proceeds toan error code on the red diagnostic LED, troubleshoot per the Fault conditions table below:

Fault Conditions

LED Indication	Fault Mode
Off	Normal Operation
1 Flash	Blower or Airflow Fault
2 Flashes	Flame without Call for Heat
3 Flashes	Ignition Lockout
Steady On	Internal Control Failure

The LED will flash on for 1/4 second, then off for 1/4 second during a fault condition. The pause between fault codes is 3 seconds.

Sympton	Recommended Actions
1. Dead	Miswired Transformer/battery bad Fuse/circuit breaker bad No voltage at PWR or AIR Bad control
2. Thermostat on - No blower output	Miswired or failed air flow switch Bad thermostat no voltage at TH Bad control
3. Airflow Switch input okay, but no trial for ignition after purge delay	Miswired Bad control
4. Valve on, no spark	Shorted electrode Open HV cable Miswired Bad control
5. Spark on, no valve	Valve coil open Open valve wire Bad control (check voltage between V1 and GND)
6. Flame OK during TFI, no flame sense (after TFI)	Bad electrode Bad HV wire Poor ground at burner Bad control

Fenwal 35-535911-113 Installation Manual

Dimensions:

Wiring Diagram:

Atwood Furnace Models Supported:

The Fenwal 35-535811-113 kit allow for direct replacement of the furnace control in the following Atwood furnaces:

• 7912-II, 7916-II, 7920-II
• 8012-II
• 8516-I, 8520-I, 8525-I
• 8516-II, 8520-II, 8525-II
• 8516-III, 8520-III, 8525-III
• 8516-IV, 8520-IV, 8525-IV
• 8531-I, 8535-I
• 8531-II, 8535-II
• 8531-III, 8535-III
• 8531-IV, 8535-IV
• DC8225, DC8232, DC8235, DC8241
• DC89-I, DC89-II, DC89-III
• FA-72D, FA-76D, FA-79D
• FA-7825, FA-7832, FA-7835, FA-7841
• HF-80D

Limited Warranty

Product: Fenwal 35-535911-113 12VDC Gas Ignition control

Service: Applicable Atwood Hydro Flame RV furnaces ONLY.

Kidde-Fenwal, Inc., d/b/a Fenwal Controls (hereinafter "Fenwal") warrants to the original purchaser that the enclosed Product will be free from defects in materials and workmanship and that it shall conform to specifications published by Fenwal for a period of four years. The warranty period begins on the date of purchase and is valid only for Products purchased from an authorized Fenwal dealer.

Fenwal's sole liability and obligation under this warranty shall be to replace the Product through the original Fenwal dealer. All claims must be pre-approved by the dealer, use the dealers returned goods process and includedated proof of original purchase listing the Product (receipt or invoice). For a claim to be validated, the Product:

• Must be within the warranty period
• Must show no evidence of physical damage, overstress, repairs or modifications

This warranty applies solely to Products used in Atwood hydroflamefurnaces specifying Atwood part number 31501 or 33488 and installed and operated in strict compliance with the Fenwal installation instructions. This warranty does not extend to the furnace or the furnace components.

This warranty shall not apply ifthe Product has been damaged, modified, abused or altered after the date of purchase.

ANY DEVIATIONS OR OTHER USE VOIDS THE PRODUCT WARRANTY, VOIDS THE AGENCY LISTINGS OF THE PRODUCT, VOIDS THE AGENCYLISTINGS OF THE FURNACE, AND CAN BE HAZARDOUS.DISCLAIMER OF WARRANTIESFENWAL MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE PRODUCTS DELIVERED HEREUNDER, NOR IS THERE ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, EXCEPT FOR THE WARRANTY DETAILED ABOVE. IN NO EVENT SHALL FENWAL BE LIABLE TO PURCHASER OR ANY OTHER PERSON (A) FOR CONSEQUENTIAL, INCIDENTAL OR SPECIAL DAMAGES OR (B) FOR DIRECT DAMAGE, OTHER THAN AS EXPRESSLY SPECIFIED ABOVE. FENWAL'S AGGREGATE LIABILITY ARISING FROM THE SALE OF THIS PRODCUCT ORUNDER THIS LIMITED WARRANTY, WHETHER IN TORT, CONTRACT OR OTHERWISE, SHALL NOT EXCEED THE PRICE PAID BY PURCHASER FOR THE GOODS SOLD HEREUNDER.

Fenwal is a registered trademark of Kidde-Fenwal, Inc.Hydro Flame is a trademark of Atwood Mobile Products.All other trademarks are property of their respective owners.