Schwank IO-100 Manuel du propriétaire télécharger pdf (Page 19)

GP-M230-BX-06A

2300 / IO 210 Manual

RD: Sept, 2005

R.L. 6

LOW/ UNSTEADY FLAME CURRENT

If the current to the S87C flame circuit is

less than 1.5 uA or is unsteady, check the

burner flame, flame sensor location and

electrical connections as follows.

Electrical Connections and Shorts

Connections at the flame sensor must be clean

and tight. If wiring needs replacement, use

moisture resistant #18 wire rated for

continuous duty up to 105

C [221

F].

Flame Sensor

The flame signal is best when about 1 in. [25

mm] of flame rod is immersed in the burner

flame. A bent flame rod, or mounting bracket

or a cracked ceramic insulator can affect

flame signal. Replace flame sensor if necessary.

Burner Flame

The flame sensor must be constantly immersed

in flame. Check burner flame conditions as

shown opposite. Observe Burner rating

plate for the correct gas pressure, and check

it with a manometer. If gas pressure is OK

check gas line and orifice for obstructions

12. FLAME SENSING CIRCUIT - HONEYWELL S87C DSI CONTROL

Flame current is the current which passes through the flame from the sensor to ground. The

minimum flame current necessary to keep the Honeywell S87C system from lockout is 1.5

uAmps (microamps). The output of the flame sensing circuit cannot be checked directly on

the S87C Control body. The flame sensing circuit current can be checked by bridging the

flame sensing current from the sensor to the S87C as follows.

1. Connect a meter (dc microammeter scale) in series with the flame sensor wire as

shown below. Using the Honeywell W136A Test Meter or equivalent. Disconnect

the sensor wire from the S87C, Connect the red (positive) meter lead to the free end of

the sensor wire. Connect the black (negative) meter lead to the quick-connect sensor

terminal on the S87C.

2. Restart the system and read the meter. The flame sensor current must be at least 1.5 uA and

steady. If the reading is less than 1.5uA

or unsteady, see LOW OR UNSTEADY FLAME

CURRENT section, below.

If a flame is present at sensor and a reading of zero uA is obtained, check for a

secondary ground connection to the 25V (GND) terminal. If secondary connection

exists, temporarily remove connection and measure flame current again.

A good rectifying flame is

achieved with approx 1”

of sensor in a strong blue

flame, positioned 1/4” to

1/2” away from flame

source surface.

A lazy or weak flame is

not a good rectifying flame.

Check gas pressure and gas

line/orifice etc for insects.

and spider cocoons.

1”

1/4” to 1/2”

Sensor spade

on S87C

connect to

wire from

sensor

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Schwank IO-100 Manuel du propriétaire Page 19

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