20
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
9. Operational flow chart
dŚĞĚŝĂŐƌĂŵďĞůŽǁƌĞĨĞƌƐƚŽďŽƚŚƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚKƵƚĚŽŽƌŵŽĚĞůƐ͘
Power supply ON
KƉĞƌĂƟŽŶ^tKE
&sΘsŽƉĞŶ
Pre-check
NORMAL?
&ĂƵĐĞƚŽƉĞŶƐ
tĂƚĞƌ&ůŽǁ
Above 0.5GPM?
FM speed
(Below
1,000rpm?)
&ĂŶŵŽƚĞƌƐƚĂƌƚ
ŽƉĞƌĂƟŽŶ
Flame rod
DC0.15
ʅ
A?
/ŐŶŝƚĞƌKE
,ŝͲůŝŵŝƚ
Normal?
OHCF
Normal?
MV ON
^sϮKE
GPV ON
Flame rod
detects Above
DC1.0
ʅ
A?
ƵƌŶŝŶŐůĂŵƉKE
/ŐŶŝƚĞƌK&&
WƌŽƉŽƌƟŽŶĂůĐŽŶƚƌŽů
BTU
ĐŚĂŶŐĞŽǀĞƌ
ƉŽŝŶƚ͍
^sϭ^sϯKE
Below water
ŚĞĂƚĐĂƉĂďŝůŝƚLJ͍
FAV OPEN
^ĂĨĞƚLJĚĞǀŝĐĞƐ
ƐĞŶƐĞĚ
ĂďŶŽƌŵĂůĐŽŶĚŝƟŽŶ
FAV close
^sϭ^sϯK&&
&ĂůƐĞŝƉƐǁŝƚĐŚƐĞƫŶŐƐ
/Ŷd,ĨĂŝůƵƌĞ
WĨĂŝůƵƌĞ
DsĐŝƌĐƵŝƚĨĂŝůƵƌĞ
ϬϯϭďůŝŶŬ
ϯϮϭďůŝŶŬ
ϳϬϭŽƌϳϳϭďůŝŶŬ
ϱϭϬďůŝŶŬ
ϲϭϭďůŝŶŬ
&ĂŶŵŽƚŽƌƐƚŽƉ
ŽƉĞƌĂƟŽŶ
ϳϮϭďůŝŶŬ
&ĂůƐĞŇĂŵĞ
/ŐŶŝƚĞƌK&&
ZĞŝŐŶŝƟŽŶ
^ƵĐĐĞƐƐ͍
MV OFF
^sϮK&&
GPV OFF
^sϭ^sϯK&&
&ĂŶŵŽƚŽƌƐƚŽƉŽƉĞƌĂƟŽŶ
Faucet closes
&ůŽǁƐĞŶƐŽƌK&&
Remove cause
KƉĞĂƌƟŽŶůĂŵƉK&&
KƉĞƌĂƟŽŶƐƚŽƉ
z^
NO
z^
NO
NO
z^
z^
NO
;ϮϬƐĞĐůĂƚĞƌͿ
z^
NO
NO
z^
z^
NO
z^
NO
(5sec later)
z^
z^
NO
z^
NO
;ϮϬƐĞĐůĂƚĞƌͿ
z^
NO
NO
NO
z^
FM speed
(Above
1,000rpm?)
Below
DĂdžŇŽǁƌĂƚĞ
ƌĞƐƚƌŝĐƟŽŶ͍
ϭϭϭďůŝŶŬ
ϭϮϭďůŝŶŬ
ϯϰϭďůŝŶŬ
ϯϭϭďůŝŶŬ
KƵd,ĨĂŝůƵƌĞ
ϯϭϭďůŝŶŬ
KƵd,ĨĂŝůƵƌĞ
ϯϯϭďůŝŶŬ
Flame
blows out
OHCF melted
;ĂďŽǀĞϰϯϬ
゜
F)
AFR rod
ĨĂŝůƵƌĞ
ďŶŽƌŵĂů
ďƵƌŶŝŶŐ
ϭϮϭďůŝŶŬ
ϭϮϭďůŝŶŬ
ϵϵϭďůŝŶŬ
ϯϵϭďůŝŶŬ
BV modulates
Flow&temp
ϯϮϭďůŝŶŬ
/Ŷd,KWE
Žƌ^,KZd
ϯϯϭďůŝŶŬ
OuTH OPEN
Žƌ^,KZd
detects Below
&s͖&ůŽǁĚũƵƐƚŵĞŶƚsĂůǀĞ
B V ; Bypass Valve
&D͖&ĂŶDŽƚŽƌ
K,&͖KǀĞƌ,ĞĂƚƵƚͲŽī&ƵƐĞ
Ds͖DĂŝŶŐĂƐsĂůǀĞ
^sϭ͖^ŽůĞŶŽŝĚsĂůǀĞϭ;^ĞĞƚŚĞƐĞĐƟŽŶϲͿ
^sϮ͖^ŽůĞŶŽŝĚsĂůǀĞϮ;^ĞĞƚŚĞƐĞĐƟŽŶϲͿ
^sϯ͖^ŽůĞŶŽŝĚsĂůǀĞϯ;^ĞĞƚŚĞƐĞĐƟŽŶϲͿ
'Ws͖'ĂƐWƌŽƉŽƌƟŽŶĂůsĂůǀĞ
/Ŷd,͖/ŶůĞƚƚŚĞƌŵŝƐƚŽƌ
KƵd,͖KƵƚůĞƚƚŚĞƌŵŝƐƚŽƌ
,ĞĂƚĞdžĐŚĂŶŐĞƌd,͖,ĞĂƚĞdžĐŚĂŶŐĞƌƚŚĞƌŵŝƐƚŽƌ
džŚĂƵƐƚd,͖džŚĂƵƐƚƚŚĞƌŵŝƐƚŽƌ
W͖WƌŝŶƚŝƌĐƵŝƚďŽĂƌĚ
(Computer board)
&Z͖ŝƌ&ƵĞůZĂƟŽƌŽĚ
;KŶůLJϱϰϬ;dͲ,ϯͿŵŽĚĞůƐͿ
;KŶůLJϮϰϬ;dͲ,ϯ:ͿͬϮϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐͿ
PCB
ĨĂŝůƵƌĞ
ϳϭϭďůŝŶŬ
Exhaust
ƚĞŵƉ͘ĨĂŝůƵƌĞ
ϵϰϭďůŝŶŬ
*
^sĐŝƌĐƵŝƚĨĂŝůƵƌĞ
ϱϱϭďůŝŶŬ
dŚĞƌŵŝƐƚŽƌŽƌ,>ƐǁŝƚĐŚ
ĨŽƌĞdžŚĂƵƐƚŐĂƐĨĂŝůƵƌĞ
ϵϰϭďůŝŶŬ
&ĂƵůƚŽĨŇŽǁĂĚũƵƐƚŵĞŶƚ
valve
ϲϱϭďůŝŶŬ
*NOTE
dŚĞΗϯϰϭΗĂŶĚΗϵϰϭΗĞƌƌŽƌĐŽĚĞĂƌĞ
ĞŶĂďůĞĚŝŶƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐ͘
,ĞĂƚĞdžĐŚĂŶŐĞƌd,ĨĂŝůƵƌĞ
;KŶůLJϱϰϬ;dͲ,ϯͿŵŽĚĞůƐͿ
džŚĂƵƐƚd,ĨĂŝůƵƌĞ
ϯϰϭďůŝŶŬ
&ĂŶŵŽƚŽƌ
ĨĂƵůƚ
ϲϭϭďůŝŶŬ
KƵd,KWEŽƌ^,KZd
;KŶůLJϮϰϬ;dͲ,ϯ:ͿͬϮϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐͿ
,ĞĂƚĞdžĐŚĂŶŐĞƌd,KWE
;KŶůLJϱϰϬ;dͲ,ϯͿŵŽĚĞůƐͿ
ExhaustTH
KWEŽƌ^,KZd
*
;KŶůLJϱϰϬ;dͲ,ϯͿŵŽĚĞůƐͿ
;KŶůLJĂƐLJͲůŝŶŬƐLJƐƚĞŵͿ
&ĂƵůƚŽĨ
bypass valve
ϲϲϭďůŝŶŬ
;KŶůLJϱϰϬ;dͲ,ϯͿŵŽĚĞůƐͿ
Žƌ^,KZd