Honeywell S8910U Installation Instructions And Safety Information page 8

S8910U UNIVERSAL HOT SURFACE IGNITION MODULE
4. Make sure the transformer has adequate VA.
The ignition module requires 0.4A at 24 Vac.
Add the current draws of all other devices in
the control circuit, including the pilot and main
valves in the gas control, and multiply by 24 to
determine the total VA requirement of these
components. Add this total to 9.6 VA (for the
ignition module). The result is the minimum
transformer VA rating. Use a Class II trans-
former when replacement is required.
5. Check that L1 (hot) and L2 (neutral) are wired
to the proper terminals.
Terminal Function
Burner Ground Connection
Tranformer Secondary
(unswitched leg)
Main Valve Common
Transformer Secondary
(switched leg)
Main Valve Operator
120 Vac Neutral Leg
Power Supply
120 Vac Hot Leg Power
Supply
Hot Surface Igniter Element
Hot Surface Igniter Element
Flame Sensor
a
Remove quick-connect and replace with the included 1/4 in. quick-connect.
b
Use green adapter cable (provided) to connect S8910U GND (BURNER) terminal to chassis ground.
c
Do not use the S8910U VALVE (GND) terminal. VALVE (GND) and 24V (GND) are interconnected in the appliance
wiring.
d
Remove quick-connect and replace with the included 3/16 in. quick-connect.
e
Do not use this terminal if model being replaced does not have 120V neutral power supply connection.
f
Use the black wire on the included adapter cable.
g
Use the orange wire on the included adapter cable.
h
On remote sense models, remove jumper quick-connect from S8910U sense terminal, cut jumper wire at circuit board
and discard. On local sense models, leave black jumper connected.
i
Remove jumper from S8910U sense terminal, cut jumper wire at circuit board and discard.
69-0845—2
Table 4. Replacement Wiring Terminals.
Replacement Control
S8910U
Terminal
GND (BURNER)
24V (GND)
VALVE (GND)
24V
VALVE
e
L2 120V NEUTRAL
L1 120V HOT
e
HSI 120V NEUTRAL
HSI 120V HOT
h
SENSE
1. Connect the wires to the S8910U Ignition Module as
shown in Table 4. Make sure that adequate system
ground is provided as indicated in the wiring table.
See Fig. 3 through 5. Where a change in quick-
connect is required, cut off the original quick-
connect, strip the leadwire and firmly crimp in place
the proper quick-connect supplied.
2. Verify the thermostat anticipator setting as explained
in the preceding IMPORTANT, item 4.
Original Control
Honeywell
S89/S890 Terminal 50E/F47 Terminal
a
GND (BURNER)
a
24V (GND)
a
VALVE (GND)
a
24V
VALVE
L2 120V NEUTRAL
L1 120V HOT
HSI 120V
HSI 120V
h
SEN
8
White Rodgers Robertshaw
HS780 Terminal
GND TR (GND CLIP)
TR
a
MV (next to
TR terminal)
TH
d
MV
—
f
L
—
g
IGN
i
FP
b
GND
c
—
TH
d
VALVE
L2
L1
IGN
IGN
h
RS