Auxiliary Controls; General Precautions - Honeywell S8700 Series Installation Instructions Manual

2-13/16 (72)
3-15/16 (100)
3-3/8 (86)
3/16 (4)
Fig. 1. S8700 mounting dimensions in in. (mm).

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: NOTE: Make sure the 24V system transformer
is rated to handle both the S8700 current and
the total gas valve current.
WIRING

General Precautions

1. For circuits that differ from the diagrams in Fig. 2
and 3, check the wiring diagrams from the heating
appliance manufacturer, if available. Carefully fol-
low any special instructions that would affect the
following general procedures.
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. When installing a separate flame sensor, the
sensor leadwire should be kept as short as
possible and should not be allowed to rest against
grounded metal surfaces.
5. Ignition cable should not touch any metal surface
or current carrying wires. It must not be more than
6 ft (1.8m) long. See Table 2 for recommended
ignition cable.
6. Do not short valve terminals as this can damage
the temperature controller, the transformer or the
S8700 control.
S8700B,D-F,J-M DIRECT SPARK IGNITION CONTROLS
13/16 (21)
2
(50)
1-1/8
(29)
UL Style 3257
Wiring the S8700 Control
1. Connect the system components to the S8700
5/17 (7)
2. Adjust the temperature control heat anticipator (if
5-3/16
(130)
3-3/8
(86)
NOTE: NOTE: Use only recommended ignition cable
7/8 (23)
M16233
3
Table 2. Recommended Ignition Cable.
RMS Voltage
Cable Type Rating
10,000
terminals as shown in the wiring diagrams, Fig. 2
and 3. Refer to the heating appliance manufac-
turer's instructions for wiring any other auxiliary
controls.
provided) to match the system current draw. The
current draw equals the total current required for
the S8700 (0.15A) plus the gas valve and all other
24V control loads (vent dampers, and prepurge
relays). Gas valve must be designed for the DSI
application.
(see Table 2), or equivalent, to connect the
S8700 with the spark igniter. Cable must not
run in continuous contact with a metal surface
or spark voltage is greatly reduced; use
ceramic standoff brackets if necessary. Cable
length must not exceed 6 ft (1.8m).
2
TRANSFORMER
S8700D,F,K,M CONTROL
FLAME
SENSE
GND
VALVE (GND) ALARM
24 Vac (GND)
VALVE
24 Vac
BURNER
(GND)
SPARK
3
TEMPERATURE
CONTOL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
ALTERNATE LIMIT CONTROLLER LOCATION.
3
MAXIMUM IGNITER-SENSOR CABLE LENGTH: 6 FT (1.8 M).
Fig. 2. Typical wiring diagram for
S8700D,F,K,M dual rod models.
Maximum
Ambient
Temperature
Rating
F C
482 250
LIMIT CONTROLLER
L1
(HOT)
1
L2
ALARM, IF USED
ANY COMBINATION
GAS CONTROL
2.0A MAX.
Q347
SPARK
Q354 FLAME
IGNITER
SENSOR
BURNER
IGNITER AND
BURNER GROUND
M16527
69-1299