Monitor 422 Service Manual page 45

MONITOR HEATING SYSTEMS
Section 6: Troubleshooting
Monitor 22 ,'41 Component Voltage Readings
COMPONENT READING TAKEN AT A C D C
Thermistor 0 on PCB Sensor disconnec:ic 5
Thermistor 0 on PCB Sensor connect&
1
.E-2.3
Air Pressure Switch Connector J 110
Overheat Protector Closed
Air Pressure Switch Connector J 0
Overheat Prctector Ooen
Damper Solenoid l on PCB 105
- -
Solencld Pump K on PCB 105
C~rculation Fan H ~ g h Speed GFi to BK BK to RD lM-21) 110
BL to BK BK to WH (M-4C1 110
C~rculatlon Fan Low Speed YL to RD GR to YL IM-21) 110
GR to WH BL to GR IM-40) 110
lgn~ter
B on PCB 110
Power Transformer
H on PCB 110
(primary side)
Power Transformer Connector L 120
(secondary side) Connector M
11
Combost~on Blower
F on PCB
110
High Soeed
Comcust~on Blower F on PCB P2fFvl-221
Low Soeed (RL3 is OFF) 88(M-41)
Resistcr G on PCB 18tM-22)
221 M -31 1