General Precautions - Honeywell S8701 Installation Instructions Manual

Table 4. Transformer Ratings for S8701/S8702 and
Dual Valve Combination Gas Controls.
Minimum VA
Rating (24V
transformer) (in amperes)
20
30
40
55
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.
Voltage Rating
Cable Type
UL Style 3257
Total Valve
Current S8701/S8702
(in amperes)
up to 0.6 0.15
0.6 to 1.0 0.15
1.0 to 1.4 0.15
1.4 to 2.0 0.15
Temperature
Rating
RMS
F
10,000 482
S8701/S8702 DIRECT SPARK IGNITION CONTROLS
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).
2
S8701D CONTROL MODULE
GND
VALVE (GND)
24 Vac (GND)
24 Vac
TEMPERATURE
CONTOLLER
C
250
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) OR LESS.
3
LIMIT CONTROLLER
TRANSFORMER
FLAME
SENSE
ALARM
VALVE
BURNER
(GND)
SPARK
Q347
SPARK
IGNITER
3
IGNITER AND
BURNER GROUND
Fig. 2. S8701 Wiring Diagram.
L1
1
(HOT)
L2
ALARM, IF USED
ANY COMBINATION
GAS CONTROL
2.0A MAX.
Q354 FLAME
SENSOR
BURNER
M16232A
69-1174