Specifications

MONITOR HEATING SYSTEMS
Section 6: Troubleshooting | M-2200
Resistance values
COMPONENT APPROX. OHMS
Igniter (connector B/B) 16.8
Power Transformer-Primary (AC 120V) "Blue" & "Blue" Connector H 141
Power Transformer-Secondary (AC 12V) "Yellow" & "Yellow" Connector R ^.9
Power Transformer—Secondary (AC 120V) "White" & "White" Connector R 590
Circulation Fan (LEAD WIRE "RED " & " BLACK") 430
Circulation Fan (LEAD WIRE "BLACK " & " YELLOW") 420
Combustion Blower (LEAD WIRE "BLACK" & " BLACK") 112.
Thermistor (connector Q/Q, at 77'F) 10,000
Fuse 2A (read with fuse out) 0.1
Fuse 10A (read with fuse out) 0.01
Solenoid Pump (Bypass resistor at pump and read accross coil) 990
WARNING:
DISCONNECT HEATER FROM POWER SOURCE
BEFORE MAKING ANY RESISTANCE TESTS.
Component Voltage Readings
COMPONENT
Thermistor
Thermistor
Air Pressure Switch/
Overheat Protector Closed
Air Pressure Switch/
Overheat Protector Open
Solenoid Pump
Circulation Fan High Speed
Circulation Fan Low Speed
Igniter
Power Transformer
(primary side)
Power Transformer
(secondary side)
Combustion Blower
High Speed
Combustion Blower
Low Speed
* Pulse can only be measured
READING TAKEN AT
Q on PCB Sensor disconnected
Q on PCB Sensor connected
Connector J
Connector J
K on PCB
RD to BK
RD to BK
Bon PCB
AC 120V
AC 120V
AC 12V
F on PCB
F on PCB
with a high impedance digital volt meter.
AC
110
0
110
90
110
110
120
12
80
62
DC
5
1.5-3.2
pulse*
51