Troubleshooting Guide - Honeywell S8701 Installation Instructions Manual

Direct spark ignition controls

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Table Of Contents

Table of Contents

Low or Unsteady Flame Current

If the current to the S8701/S8702 is less than 1.0 A or is

unsteady, check the burner flame, flame sensor location

and electrical connections as follows:

Burner Flame

The flame sensor must be constantly immersed in flame.

Check burner flame conditions as shown in Fig. 8.

Flame Sensor

The flame signal is best when about 1 inch. (25 mm) of

flame rod is immersed in the burner flame. A bent flame

rod, bent mounting bracket or cracked ceramic insulator

can affect flame signal. Replace flame sensor if necessary.

Electrical Connections and Shorts

Connections at the flame sensor must be clean and tight. If

wiring needs replacement, use moisture resistant no. 18

AWG wire rated for continuous duty up to 105 C (221 F).

CHECK BURNER FLAME CONDITION

NOISY LIFTING FLAME

BURNER

WAVING FLAME

SMALL BLUE FLAME

LAZY YELLOW FLAME

GOOD RECTIFYING FLAME

1 IN. (25.4 MM)

1/4 TO 1/2 IN. (6.4 TO 12.7 MM)

Fig. 8. Check Burner Flame Conditions.

CHECK FOR:

• HIGH GAS PRESSURE

• EXCESS PRIMARY AIR

OR DRAFT

CHECK FOR:

• POOR DRAFT

• EXCESS DRAFT

• HIGH VELOCITY OR

SECONDARY AIR

INSTALL SHIELD IF NECESSARY.

CHECK FOR:

• CLOGGED PORTS OR

ORIFICE FILTER

• WRONG SIZE ORIFICE

CHECK FOR

LACK OF AIR FROM:

• DIRTY PRIMARY

AIR OPENING

• LARGE PORTS

OR ORIFICES

M18055

S8701/S8702 DIRECT SPARK IGNITION CONTROLS

Checkout After Service

Perform the following steps before leaving the job (de-

scribed in the CHECKOUT section).

•

START SYSTEM

•

TRIAL FOR IGNITION PERIOD CHECK

•

SAFETY LOCKOUT RESET

Also perform any other checks recommended by the

heating appliance manufacturer if system components

other than the S8701 or S8702 were serviced.