Monitor 4221441 Component Voltage Readings - Monitor 422 Service Manual

MONITOR HEATING SYSTEMS
Section 6:
Troubleshooting
Monitor 4221441 Component Voltage Readings
COMPONENT READING TAKEN AT A C DC
Thermistor Q on PCB Sensor disconnected 5
- - -
Thermistor Q on PCB Sensor connected 1.53.2
Air Pressure Switch,' Connector J 1 1 0
Overheat Protector Closed
Air Pressure Switch,' Connector J
0
Overheat Protector Open
Damper Solenold I on PCB 105
Solenoid Pump
K on
PCB pulse'
C~rculat~on Fan High Speed
RD
to BK(M-422)
110
WH to BK(M-441)
110
Circulation Fan Low Speed RD to
BK(M-422) 93
WH to BK(M-441)
9 l
Igniter B on
PCB 110
Power Transformer AC 120V 110
(primary
side)
Power Transformer AC 120V
120
(secondary s~de) AC 12V 12
Combustion Blower
F on PCB 110
I
High Speed
Combust~on Blower F on
PCB
921M-422)
Low
Speed (Ql is Off) ~ ~ ( ~ - 4 4 1 )
Res~stor G on PCB
1WM-422)
22(M41)
*Pulse can only be measured with a hlgh
impedance
d~gltal volt meter.