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3A(FUSE)
ARRESTER
GND
HOT
FROSTSENSING
SWITCH
VARISTOR N
NEUTRAL
ANTI-FROSTHEATER
IGNITION
®
J
i SW,TC_,s__F_......i_°
, _-,
J
WATERFLOW Q
SENSOR
(_ ATERFLOW
SENSOR
CiRCUiT
WATERFLOW QCON_L DEVtCE
(_ WATERFLOW
CONTIROLDEVICE
CIRCUIT
r
! BY-PASSFLOVV
I CONTROLDEVICE
T
GND
I
BY-PASSSERVOMODELONLY
DRMNG
CIRCUIT
DRIVING
CIRCUIT
OUTGOINGWATER
_ ,THERMISTOR
HEATEXCHANGER
r_) , THERMISTOR
_I_T_'_TTURE
I
I1_ THERMISTOR
L
INDOORMODELONLY
MODULATING
SOLENOID
VALVE
COMBUSTION
FAN
FLAMEROD
Figure 16
305 & 505 Indoor Manual 33