Service manual

T-M50 / T-M50 ASME Service manual
Ver. 1.05
13
CONFIDENTIAL
9. Operational flow chart
Power supply ON
Operat ion SW ON
FAV&BV open
Pre-c heck
NORMA L?
Faucet opens
Water Flow
Above 0.5GPM?
FM spe ed
(Below
1,000 rpm?)
Both f an moter
start operation
Flame rod
detects Belo w
DC0.1 5 A?
Hi-li mit
Norma l?
OHCF
Normal ?
Left MV ON
Left SV2 ON
Left GPV ON
Flame rod
detect s Above
DC1.0 A?
Burning lamp ON
Left Igniter OFF
Propo rtional control
BTU
change over
poin t?
Left SV1 SV3 ON
Bel ow water
heat capability?
Left FAV OPEN
Safet y devices
s ensed
abnor mal condition
Left F AV CLOS E
Left S V1 SV3 OFF
False Dipswi tch
settings
InTH failure
PCB f ailure
MV circuit f ailure
031 bl ink
321 bl ink
701 bl ink
510 bl ink
*611 blink
Both fan mot or
stop operati on
721 b linkFalse flame
Left I gniter OFF
Reignition
Success?
Left
OuTH OPEN
or SHORT
Left
Fan motor
fault
Left SV2 OFF
Left GPV OFF
Left SV1 SV3 OFF
Fan m otor
stop operation
Faucet closes
Flow s ensor OFF
Remov e cause
Opeartion lam p OFF
Operat ion 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 spe ed
(Above
1,000 rpm?)
Bel ow
Max f low rate
rest riction?
111 b link
121 b link
*611 blink
311 blink
OuTH failure
311 bl ink
MiTH failure
331 bl ink
Left
Fla me
blows out
Lef t
OHCF m elted
(abov e 430 F)
Left
AFR rod
failure
Left
Abnormal
burning
121 blink121 blink991 blink391 blink
BV modulates
Flow&t emp
321 blink
Left
InTH OPEN
or SHORT
331 blink
Left
MiTH OPEN
or SHORT
SV ci rcuit f ailure 551 bl ink
661 bl ink
Fault of Flow
adjustment function
in Water control
Valve
Fault of Bypass
function in Water
control Valve
651 bl ink
B
Only one unit
should work?
NO
YE S
Bo th co mbust i on se ctio n s
(r igh t and l e ft) w ill
st art o perat i on.
Left Igniter ON
Left False d etectio n
Left Ignition failur e
Left Flame b lows up
FAV ; Flow Ad justment Valv e
B V ; Bypass Valve
F M ; Fan Mot or
OHCF; Over He at Cut-off Fu se
SV1 ; Solenoi d Valve 1 (Se e the s ection 6)
SV2 ; Solenoi d Valve 2 (Se e the s ection 6)
SV3 ; Solenoi d Valve 3 (Se e the s ection 6)
M V ; Main ga s Valve
GPV ; Gas Pro portion al Valve
InTH; Inlet t hermist or
OuTH; Output thermis tor
MiTH; Mixing thermis tor
PCB ; Print C ircuit board
(Co mputer board)
AFR ; Air Fue l Ratio rod
In t his cha rt,
Th e primary uni t is
Le ft combus tion sec tion .
Th e seconda ry u nit is
Ri gh t combu stio n se ctio n.
Primary combustion section
change from Left to Right
No error code
in Right unit
YE S
B
Error code
in Left unit
YE S
NO
NO
Comp onent s in t hi s ch ar t
swit ch fr o m Lef t comb us ti o n
sect ion t o Righ t comb us ti o n
sect ion.
*W hen the " 611" e rr or
co de a ppe ar s, bo t h
co mbu s tio n secti o ns
(r igh t an d/ or le f t)
wi ll s top o perat i on .
Left MV OFF