33
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-10. Flow sensor
Part#
ͻഩϯϭϵϭϰϯͲϰϲϯ;<ϭϮϵͿ
Unit Part#
#402
Function
ĞƚĞĐƚƐ ĂŶĚ ŵĞĂƐƵƌĞƐ ǁĂƚĞƌ ĨůŽǁ ƌĂƚĞ ƵƐŝŶŐ Ă ƐƉŝŶŶŝŶŐ ŝŵƉĞůůĞƌ ĂŶĚ
magnetic pick-up.
Failure events
hŶĂďůĞƚŽĚĞƚĞĐƚŽƌŵĞĂƐƵƌĞĂŶLJǁĂƚĞƌĨůŽǁƌĂƚĞ͘
Effects on the water heater
if flow sensor fails
/ŐŶŝƚŝŽŶ ƐĞƋƵĞŶĐĞ ĚŽĞƐ ŶŽƚ ƐƚĂƌƚ ;ǁĂƚĞƌ ŚĞĂƚĞƌ ǁŝůů ŶŽƚ ŝŶŝƚŝĂƚĞ ĂŶLJ
operation)
Error codes when flow
sensor fails
441 (only within Easy-Link systems)
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ
impeller.
Ϯ͘ŚĞĐŬǀŽůƚĂŐĞƐ͗ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
Red - Black
ϰ͘ϬƚŽϱ͘ϱs;/ŶƉƵƚͿ
Check
point
H2
White(85) -Black
1.0 to 4.0 VDC (pulse)
ϭ͕ϬϴϬƉƵůƐĞͬŵŝŶ;ŵŽƌĞƚŚĂŶϭϴ,njͿ
The flow sensor is assembled with the flow adjustment valve.
Flow
adjustment
valve
Flow sensor
Flow
adjustment
valve
Flow sensor
IN
OUT
OUT
IN
Flow sensor
Red
White
Black
GND
OUTPUT
VCC
>PPE
-GF<
3-3/8" (84.4 mm)
2
1
3
1
2
3
1-7/8" (47 mm)
2-5/8" (67.5 mm)