T-M50 / T-M50 ASME Service manual
Ver. 1.05
13
CONFIDENTIAL
9. Operational flow chart
Power supply ON
Operation SW ON
FAV&BV open
Pre-check
NORMAL?
Faucet opens
Water Flow
Above 0.5GPM?
FM speed
(Below
1,000rpm?)
Both fan moter
start operation
Flame rod
detects Below
DC0.15 A?
Hi-limit
Normal?
OHCF
Normal?
Left MV ON
Left SV2 ON
Left GPV ON
Flame rod
detects Above
DC1.0 A?
Burning lamp ON
Left Igniter OFF
Proportional control
BTU
change over
point?
Left SV1 SV3 ON
Below water
heat capability?
Left FAV OPEN
Safety devices
sensed
abnormal condition
Left FAV CLOSE
Left SV1 SV3 OFF
False Dipswitch
settings
InTH failure
PCB failure
MV circuit failure
031 blink
321 blink
701 blink
510 blink
*611 blink
Both fan motor
stop operation
721 blink
False flame
Left Igniter OFF
Reignition
Success?
Left
OuTH OPEN
or SHORT
Left
Fan motor
fault
Left SV2 OFF
Left GPV OFF
Left SV1 SV3 OFF
Fan motor
stop operation
Faucet closes
Flow sensor OFF
Remove cause
Opeartion lamp OFF
Operation stop
YES
NO
YES
NO
NO
YES
YES
NO
(20sec later)
YES
NO
NO
YES
YES
NO
YES
NO
(5sec later)
(3sec later)
YES
YES
NO
YES
NO
(20sec later)
YES
NO
NO
NO
YES
FM speed
(Above
1,000rpm?)
Below
Max flow rate
restriction?
111 blink
121 blink
*611 blink
311 blink
OuTH failure
311 blink
MiTH failure
331 blink
Left
Flame
blows out
Left
OHCF melted
(above 430
F)
Left
AFR rod
failure
Left
Abnormal
burning
121 blink
121 blink
991 blink
391 blink
BV modulates
Flow&temp
321 blink
Left
InTH OPEN
or SHORT
331 blink
Left
MiTH OPEN
or SHORT
SV circuit failure
551 blink
661 blink
Fault of Flow
adjustment function
in Water control
Valve
Fault of Bypass
function in Water
control Valve
651 blink
B
Only one unit
should work?
NO
YE S
Bo th co m bu st i on se c t io n s
(r ig h t a nd l e ft ) w i l l
st ar t o p er at i on .
Left Igniter ON
Left False detection
Left Ignition failure
Left Flame blows up
FAV ; Flow Adjustment Valve
B V ; Bypass Valve
F M ; Fan Motor
OHCF; Over Heat Cut-off Fuse
SV1 ; Solenoid Valve 1 (See the section 6)
SV2 ; Solenoid Valve 2 (See the section 6)
SV3 ; Solenoid Valve 3 (See the section 6)
M V ; Main gas Valve
GPV ; Gas Proportional Valve
InTH; Inlet thermistor
OuTH; Output thermistor
MiTH; Mixing thermistor
PCB ; Print Circuit board
(Computer board)
AFR ; Air Fuel Ratio rod
I n t h i s c h a r t ,
T h e p r im a r y u n i t i s
L e f t c om b u s t i o n s e c t i o n .
T h e s e co n d a r y u n i t i s
R i g h t co m b u s t i o n s e c t i o n .
Primary combustion section
change from Left to Right
No error code
in Right unit
Y E S
B
Error code
in Left unit
YE S
N O
NO
C om p o ne nt s i n t hi s c h ar t
s wi t c h fr o m Le f t c om b us t i on
s ec t i on t o R ig h t c om b us t i on
s ec t i on .
*W h en th e " 6 11 " e rr o r
co d e a pp e ar s , bo t h
co m bu s ti o n s ec ti o ns
(r i gh t a n d/ o r le f t)
wi l l s to p o p er at i on .
Left MV OFF