28
Thermostat Control Model
Schematic
Note: 1) 120VAC Power Source supplied by end customer and must be interlocked through fan starter. It is the
responsibility of the end customer to provide the interlocks.
Failure to interlock heater through fan starter may lead to damage to heater in event of a
fan shutdown and will void warranty.
2) Circuit Protection is provided by the Fan Starter. This Control Panel is the control portion within and existing
Branch Circuit.
3) Ensure Heater Housing is Properly Grounded to Heater Control Panel.
4) If using a Vacon VFD see
page 54
for instructions on interlocking heater to VFD.
FENWAL AUTOMATIC IGNITION CONTROL KEY
FUNCTION
LED INDICATOR
NC
ALARM
ON = CONTROL FAULT
V1
VALVE POWER
2 FLASHES =
FLAME, NO CALL FOR HEAT
L2
NEUTRAL
3 FLASHES = IGNITION LOCKOUT
V2
VALVE NEUTRAL
L1
120VAC
B.GND
BURNER GND
S1
REM. FLAME SENSOR
FC+, FC-
FLAME SENSE
TEST POINT 2-PIN-HEADER
SCHEMATIC KEY
T1
TIMER 45 SEC
THL
TRANSITION HIGH LIMIT
THR THERMOSTAT OR HUMIDSTAT
VV
VAPOR SOLENOID VALVE
