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108796-01UT 21
Robertshaw
MODEL SP745 IGNITION CONTROL
STEP DOWN
TRANSFORMER
PV
GND
PV/MV
TR
MV
TH
VENT SAFETY
SHUTOFF SWITCH
MANUAL
DAMPER
SWITCH
IGN
EV2
SUPPLY
INCOMING
MAIN GAS
EV1
TO
GAS LINE
BURNER
24V AC
120V AC
120V AC
INCOMING
OR BREAKER)
(FUSE BOX
OFF
ON
(NOT SUPPLIED)
WALL SWITCH
GREEN
BLACK
WHITE
120v, 60Hz, 0.7A
ELECTRICAL RATING:
BLACK
WHITE
GREEN
OPTIONAL
REMOTE
CONTROL
Pilot Burner
Pilot Gas Line
WIRING DIAGRAM
SERVICE HINTS
WhenGasPressureIsTooLow
• pilot will not stay lit
• burner will have delayed ignition
• replace will not produce specied heat
• propane/LP gas supply may be low if using
propane/LP gas
If using propane/LP gas, you may feel your
gas pressure is too low. If so, contact your
local propane/LP gas supplier.
TECHNICAL SERVICE
You may have further questions about instal-
lation, operation, or troubleshooting. If so,
contact FMI PRODUCTS, LLC at 1-866-328-
4537. When calling please have your model
and serial numbers of your heater ready.
You can also visit FMI PRODUCTS, LLC’s
web site at www.fmiproducts.com.