T-M50 / T-M50 ASME Service manual
Ver. 1.05
11
CONFIDENTIAL
Check-
point
Parts and Description
Color of wires
Normal Range
H1
Gas proportional valve
White - red
1 to 15 VDC(during operation)
and
20 to 40 Ω
Red - Black
4 to 5.5 VDC
H2
Flow sensor
White(+) – Black(GND)
1 to 4 VDC (1,200Pulse/min)
Air-fuel ratio rod
Yellow – AFR rod
(Between AFR rod and
the computer board)
More than 0.5 μA
(during operation)
I
Flame rod
Orange – Flame rod
(Between flame rod and
the computer board)
More than 1 μA (during operation)
J
Water control valve
Blue – Brown
Orange – Brown
Red – Brown
13 to 16 VDC
ON: 12.5 to 16 VDC
OFF: 0 to 1 VDC
1 VDC Less ( 0° position)
K
Pump connector
White - Black
Less than 1.3 Ω
L
Heater
Black – Black
90 to 110 VAC
M
FM port
White - Black
Less than 1.3 Ω
N
Alarm contact
White - Black
Less than 1.3 Ω
