Honeywell S8702, S8701 User Manual

S8701/S8702 Direct Spark

Ignition Controls

INSTALLATION INSTRUCTIONS

APPLICATION

S8701 and S8702 Direct Spark Ignition Controls are designed for use in commercial cooking and other gas heating applications which require direct ignition and flame safety control of gas burners. S8701/S8702 controls are used to ignite the main burner(s), sense the flame and control the gas valve in these applications, see Table 1.

Table 1. S8701/S8702 Models.

Model Flame Sense Trials for Ignition Spark/Sense Prepurge

S8701D remote 1 1 No S8702D remote 1 2 No

S8702F remote 3 S8702K remote 1 2 Yes

S8702M remote 3

S8702 F and M models include an auto-reset from lockout after 1 hour.

Planning the Installation

WARNING

Fire or Explosion Hazard. Can cause property damage, severe injury, or death.

Follow these warnings exactly:

1. Plan the installation as outlined below.

2. Plan for frequent maintenance as described in

the Maintenance section.

Review the following conditions that can apply to your specific installation and take the precautionary steps suggested.

Frequent Cycling

This control is designed for use on commercial cooking appliances that typically cycle 400 times a day, year round. Perform a monthly checkout.

Water or Steam Cleaning

If a control gets wet, replace it. If the appliance is likely to be cleaned with water or steam, protect (cover) the control and wiring from water or steam flow. Mount the control high enough above the floor so it does not get wet during normal cleaning procedures.

The S8701 is a single spark, single flame sense, direct ignition control that is compatible with dual rod systems.

The S8702 is a dual spark, dual flame sense, direct ignition control capable of igniting and sensing flame on two separate gas burners that are fed by a single gas valve. The S8702 is compatible with dual rod systems only.

High Humidity or Dripping Water

Dripping water can cause the control to fail. Never install an appliance where water can drip on the control. In addition, high ambient humidity can cause the control to corrode and fail. If the appliance is in a humid atmosphere, make sure air circulation around the control is adequate to prevent condensation. Also, regularly check out the system.

IMPORTANT

Always install a splash cover to protect the control from water damage.

Corrosive Chemicals

Corrosive chemicals can attack the control, eventually causing a failure. If chemicals are used for routine cleaning, avoid contact with the control. Where chemicals are suspended in air, as in some industrial or agricultural applications, protect the control with an enclosure.

Dust or Grease Accumulation

Heavy accumulations of dust or grease can cause the control to malfunction. Where dust or grease can be a problem, provide covers for the control to limit contamination.

2No

2 Yes

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S8701/S8702 DIRECT SPARK IGNITION CONTROLS

Heat

Excessively high temperatures can damage the control. Make sure the maximum ambient temperature at the control does not exceed the rating of the control, see Table

2. If the appliance operates at very high temperatures, use insulation, shielding, and air circulation, as necessary, to protect the control. Proper insulation or shielding should be provided by the appliance manufacturer; verify proper air circulation is maintained when the appliance is installed.

Table 2. S8701/S8702 Ambient Temperature Ratings.

Operation Ambient Temperature

50 Hz -40°F to 160°F 60 Hz -40°F to 175°F

Table 3. System Requirements.

Model

S8701/ S8702

Valve used must be designed for DSI application.

Separate spark igniter and flame sensor mounted on a

common bracket.

No.

Spark Igniter

Flame

Sensor

Q347A Q354A

Q366

Valve Required

Honeywell VR8205 gas valves or equivalent

INSTALLA TION

When Installing this Product…

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure it is suitable for your application.

3. The installer must be a trained, experienced service technician.

4. After installation is complete, check out system operation.

IMPORTANT

If this is a replacement application, follow the appliance manufacturer’s instructions, if available. The manufacturer usually provides wiring diagrams, start-up and checkout instructions and the service procedures for their system. If the manufacturer’s instructions are not available, this information may be used as a general guide.

Mounting The S8701/S8702 Control

Select a location within 6 ft (1.8m) of the burner that will permit a direct cable route to the spark igniter terminal. Ready access to the terminals is necessary for wiring and servicing. The S8701/S8702 control may be mounted in any position. Use No. 6-32 machine screws or No. 8 sheetmetal screws 1 inch long for fastening. Fasten securely. Do not exceed the ambient temperature rating given in Table 2.

13/16 (21)

2 (50)

1-1/8 (29)

2-13/16 (72)

3-15/16 (100)

3-3/8 (86)

5/17 (7)

3-3/8 (86)

5-3/16 (130)

WARNING

Fire or Explosion Hazard. Can cause property damage, severe injury or death.

If a new gas control is to be installed, turn off gas supply before starting installation. Be sure to conduct a gas leak test after the control is installed.

CA UTION

Electric Shock Hazard. Can cause personal injury or equipment damage.

Disconnect power supply before wiring.

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7/8 (23)

3/16 (4)

M16233

Fig. 1. S8701/S8702 Dimensions.

Mounting Auxiliary Controls

Mount the spark igniter, flame sensor, temperature control, transformer, gas control and any other auxiliary controls according to the manufacturer’s instructions.

NOTE: The S8701 and S8702 installations require a 24V

transformer rated to handle both the S8701/ S8702 current and the gas valve current. Table 4 shows the transformer rating necessary for various loads.

S8701/S8702 DIRECT SPARK IGNITION CONTROLS

Table 4. Transformer Ratings for S8701/S8702 and

Dual Valve Combination Gas Controls.

Minimum VA

Rating (24V

transformer)

Total Valve

Current

(in amperes)

S8701/S8702

(in amperes)

20 up to 0.6 0.15 30 0.6 to 1.0 0.15 40 1.0 to 1.4 0.15 55 1.4 to 2.0 0.15

Wiring

General Precautions

1. Check the wiring diagram furnished by the heating appliance manufacturer, if available, for

circuits different from the ones shown. Carefully follow any special instructions affecting the general procedures outlined below.

2. All wiring must comply with applicable electrical codes and ordinances.

3. Disconnect the power supply before wiring to prevent electrical shock or equipment damage.

4. If installing a separate Q345A flame sensor, the sensor leadwire should be kept as short as possible and should not be allowed to rest against grounded metal surfaces.

5. A common ground is required for the S8701/S8702, the spark igniter and the main burner. The 24V (GND) terminal does not internally ground the transformer. The 24 V (GND) terminal must be grounded to the equipment chassis separately. Any auxiliary controls or limits must not be in the grounded leg.

6. Ignition cable should not touch any metal surface or current carrying wires. It must not be more than 6 ft (1.8m) long.

7. Do not short valve terminals as this may damage the temperature controller, the transformer or the S8701/S8702.

Table 5. Recommended Ignition Cable.

Temperature

RMS

Cable Type

Voltage Rating

UL Style 3257 10,000 482 250

Rating

°F °C

Wiring the S8701/S8702 Control

1. Connect system components to the S8701/S8702

terminals as shown in the wiring diagrams, Figs. 2 and 3. Refer to the appliance manufacturer’s instructions for wiring any other auxiliary controls.

2. Adjust temperature control heat anticipator to match system current draw. The current draw equals the total current required for the S8701 or S8702 (0.15A) plus the gas valve and all other 24 V control loads (vent dampers, prepurge relays, etc.). Gas valve must be designed for the DSI application.

NOTE: Use only recommended ignition cable (see

Table 5) to connect the S8701/S8702 with the spark igniter. Cable must not run in continuous contact with a metal surface or spark voltage will be greatly reduced; use ceramic standoff brackets if necessary. Cable length must not exceed 6 ft (1.8m).

S8701D CONTROL MODULE

GND

VALVE (GND) 24 Vac (GND) 24 Vac

BURNER

TEMPERATURE CONTOLLER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

ALTERNATE LIMIT CONTROLLER LOCATION.

MAXIMUM IGNITER-SENSOR CABLE LENGTH: 6 FT. (1.8 M) OR LESS.

TRANSFORMER

FLAME SENSE

ALARM

VALVE

(GND)

SPARK

LIMIT CONTROLLER

Q347 SPARK IGNITER

IGNITER AND BURNER GROUND

L1 (HOT) L2

ALARM, IF USED

ANY COMBINATION GAS CONTROL

2.0A MAX.

Q354 FLAME SENSOR

BURNER

Fig. 2. S8701 Wiring Diagram.

M16232A

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S8701/S8702 DIRECT SPARK IGNITION CONTROLS

TRANSFORMER

ALARM

VALVE

(GND)

Q354 FLAME SENSOR

LIMIT CONTROLLER

ALARM, IF USED

ANY COMBINATION GAS CONTROL

2.0A MAX.

Q347 SPARK IGNITER

BURNER

IGNITER AND BURNER GROUND

L1 (HOT) L2

Q354 FLAME SENSOR

M16267A

S8702D CONTROL MODULE

SENSE 2

SENSE 1

GND

VALVE (GND) 24 Vac (GND) 24 Vac

BURNER

SPARK 2

SPARK 1

TEMPERATURE CONTOLLER

Q347 SPARK IGNITER

BURNER

IGNITER AND

2 3

BURNER GROUND

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

ALTERNATE LIMIT CONTROLLER LOCATION. MAXIMUM IGNITER-SENSOR CABLE LENGTH: 6 FT. (1.8 M) OR LESS.

Fig. 3. S8702 Wiring Diagram.

Grounding the S8701/S8702 Spark Igniter and Main Burner

For the system to operate properly, spark igniter, flame sensor bracket, the burner (GND) terminal on the 24V (GND) terminal, and the S8701/S8702 control must share a common ground with the main burner. Use thermoplastic insulated wire with a minimum rating of 105°C (221°F) for the ground wire; asbestos insulation is not acceptable. If necessary, use a shield to protect the wire from radiant heat generated by the burner.

IMPORTANT

Use moisture resistant 18 AWG wire rated for continuous duty up to 105 tions must be clean and tight.

Connect the ground wire as follows:

1. Fit one end of the ground wire with a female 1/4 in.

quick-connect terminal and connect it to the male quick connect GND (Burner) terminal on the S8701/ S8702 control.

2. Strip the other end of the GND (Burner) wire and fasten it under the igniter bracket mounting screw. If necessary, use a shield to protect the wire from radiant heat. The burner serves as the common grounding area.

C (221°F). Connec-

3. Fit one end of another ground wire with a female 1/4 in. quick connect terminal and connect it to the male quick connect 24V (GND) terminal on the S8701/ S8702 control.

4. Strip the other end of the 24V (GND) wire and fasten it to the burner ground.

5. If used with a separate flame sensor, make sure the bracket is connected to the burner ground.

NOTE: It is not necessary that the burner is earth

grounded.

ST ARTUP AND CHECKOUT

The following start-up and checkout procedures are basic to all S8701 and S8702 control modules. If this is a replacement application, refer to the specific instructions provided by the heating appliance manufacturer (if available). Also, since the auxiliary controls used on any DSI system may differ, refer to the manufacturer’s instructions for start-up and checkout procedures for other system components.

NOTE: If one of the system components fail, the S8701/

S8702 will either not operate or it will go into safety lockout (depending on the type of failure). If the system does not perform as outlined in Start System and Check Trial for Ignition steps below, refer to the SERVICE section to determine the cause.

Gas Leak Test

If the gas control has been replaced as a part of the S8701 or S8702 installation, perform the following test for gas leaks.

WARNING

Fire or Explosion Hazard. Can cause property damage, severe injury or death.

To avoid possible explosion or fire, perform Gas Leak Test.

With the main burner in operation, paint the pipe joints and valve gasket with a rich soap and water solution. Bubbles indicate a gas leak. To stop leak, tighten joints and screws or replace the gasket. Never use a flame to check for gas leaks.

START SYSTEM

1. Turn on the power and the gas supply.

Set the temperature control to request heat and watch for a spark at the igniter (S8701D, S8702D models have no delay on start-up. S8702K and M models have a predetermined delay on start-up for prepurge.). Time the length of the spark operation; it must be within the Trial for Ignition (TFI) timing period (see Table 6).

2. Check that the system starts as follows: Spark turns on, gas valve opens at once, and burner ignites after gas reaches main burner. Once burner flame is established, spark igniter cuts off. For S8702 models; flame must be established on both burners for spark igniters to turn off.

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