Fenwal 35-61 Series - User Manual

SERIES 35-61
24 VAC Microprocessor Based Direct Spark
Ignition Control with Combustion Blower Relay
FEATURES
n 24 VAC Microprocessor Based DSI Control
n System Diagnostic LED
n Automatic reset 1 hour after lockout
n Custom prepurge and interpurge timings
n Flame sense test pins
DESCRIPTION
The Series 35-61 is a 24 VAC Microprocessor Based Direct Spark
Ignition Control designed for use in all types of heating applications.
The control utilizes a microprocessor to continually and safely
monitor, analyze and control the proper operation of the gas burner.
Value added features such as combustion blower control, LED
diagnostics, automatic one hour reset, and flame current test pins
highlight the controls benefits.
®
35.61.02
Input Power Control: 18-30 VAC 50/60 Hz
(Class 2 Transformer)
Line: 120/240 VAC
(L1, IND contacts only)
Input Current Drain 300 mA @ 24 VAC, combustion
blower relay and gas valve relay
energized (control only)
Gas Valve Rating 2.0A @ 24 VAC
Combustion Blower 3.0 FLA @ 120 VAC (6.0 LRA)
Rating 1.5 FLA @ 240 VAC (3.0 LRA)
1/4 H.P. Motor
Operating Temperature -40ºF to +160ºF
-40ºC to +71ºC
Flame Sensitivity .7µA minimum
Spark Rate Line frequency (50/60 sparks/ sec.)
Enclosure Gray (Noryl N-190) fire
retardent plastic
Moisture Resistance Conformal coated to operate
to 95% R.H. Care must be
taken to protect module from
direct exposure to water
Tries for Ignition One or three try versions
available
Trial for Ignition Periods 4.0,7.0,10.0, or 15.0 seconds
available
Prepurge & Interpurge None, 15, or 30 seconds
depending on model. Without
prepurge there is a 3.5
second delay before the first
try for ignition.
SPECIFICATIONS
APPLICATIONS
n Gas Furnaces
n Boilers
n Water Heaters
n Other Similar Appliances
Agency Certifications
Software conforms to UL 1998 requirements
Design certified to ANSI Z21.20, CAN/CSA C22.2
No. 199-M89
35-61, 24 VAC DSI Control with Blower Relay Page 1
www.fenwalcontrols.com 1-800-FENWAL-1

Summary

Sequence of Operation, Flame Recovery, and Safety Lockout

Power Up and Stand By

Control reset, self-check, and initiation of flame sensing upon power application.

Heat Mode Operation

Control sequence for heat call, pressure switch check, purge, ignition trial, and burner operation.

Failure to Light Lockout

Procedure when burner fails to light or flame is not detected during the trial for ignition.

Flame Failure Re-Ignition

Control response to loss of flame signal during operation, attempting re-ignition.

Combustion Airflow Problems Lockout

Monitoring of combustion airflow and lockout conditions due to airflow faults.

Flame Fault

Control action when main valve fails to close or flame signal is lost during operation.

Fault Conditions and LED Indication

Table detailing error modes, LED indications, and fault code flashing patterns.

Mounting and Wiring

General Mounting and Wiring

Guidelines for mounting position, surface attachment, and adherence to electrical codes.

Wiring and Operation Safety Warning

Cautionary notes regarding shock hazard, qualified personnel, vibration, and temperature limits.

Terminal Designations, Cautions, and Troubleshooting

Terminal Designations

List and description of all control terminals and their functions.

General Cautions

Important precautions regarding ceramic insulators, electrode spacing, and temperature limits.

Troubleshooting Guide

Symptom-based guide with recommended actions for diagnosing control issues.

Flame Sensor Current Check

Procedure for measuring flame current using a microammeter.

Service Checks

Guidelines for measuring flame current, minimum requirements, and polarity.

Control Configuration and Dimensions

Control Configuration Options

Details on part number coding for trial time, inter-purge, pre-purge, flame sensing, and inducer control.

Special Options

Options for control configuration including no cover, no diagnostics, and recycle after loss of flame.

Non-Standard Configurations

Explanation of non-standard part number identification and factory consultation.

Dimensions

Technical drawings and measurements for the control unit and its enclosure.

Fenwal 35-61 Series Specifications

General

Brand	Fenwal
Model	35-61 Series
Category	Controller
Language	English