Specifications

MONITOR HEATING SYSTEMS
Section 6: Troubleshooting | M-2400
Component Voltage Readings
COMPONENT READING TAKEN AT
AC
DC
Thermistor Q on PCB Sensor disconnected
Thermistor
Q on PCB Sensor connected
1.5-3.2
Air Pressure Switch/
Overheat Protector Closed
Connector J
110
Air Pressure Switch/
Overheat Protector Open
Connector J
Solenoid Pump
K on PCB
pulse*
Circulation Fan High Speed
WH to BK 110
Circulation Fan Low Speed
WH to BK 91
Igniter
Bon PCB
110
Power Transformer
(primary side)
AC 120V 110
Power Transformer
(secondary side)
AC 120V
AC 12V
120
12
Combustion Blower
High Speed
F on PCB
80
Combustion Blower
Low Speed .
F on PCB
41
* Pulse can only be measured with a high impedance digital volt meter.
50