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LP-532 REV. 8.13.2014
LP-532 REV. 8.13.2014
Description/Part #
Mixing Valve / 7850P054
Check Point
(Main PCB)
CN 10
Function
This component controls DHW outlet temperature by mixing cold and hot water.
Failure Event
① Water flow is not detected and/or water leakage occurs around the mixing valve.
② Abnormal mixing valve operation.
Effects
① Ignition sequence does not start.
② Operation of product is stopped once water leakage is detected.
Error Code
Er 66
Diagonostic
① Restart the product.
② Check the connection around the mixing valve.
Color / Wire Number
[Mixing Valve]
DHM Y Phase (black) : connector ①
DHM Y Phase (brown) : connector ②
DHM X Phase (red) : connector ③
DHM X Phase (orange) : connector ④
GND (yellow) : connector ⑤
DHM Position sensor (green) : connector ⑥
Flow2 sensor (blue) : connector ⑦
DC 14V (white) : connector ⑧
Description/Part #
APS: Air Pressure Switch /
7850P-047
Check Point
(Main PCB)
CN 11
Function
This component monitors the flue for blockage.
Failure Event
① Combustion noise is generated.
② Imperfect and lifting flame occurs.
③ The unit will not ignite.
Effects
Pressure due to exhaust blockage will affect the water heater operation.
Error Code
Er 29
Diagonostic
① Check APS wiring connection
② Check the hose for blockage or kinking.
③ Check exhaust vent for blockage
④ Check APS resistance using a multi meter.
Color / Wire Number
Air pressure switch (blue) : connector ⑤, ⑬
1. Cold water and hot water mixed
2. Step Control Motor Applied.
3. Operating Fluid : 0℃~80℃ (32 ~ 176℉)
4. Operating Pressure: 0~0.98Mpa
5. Supply Voltage : DC24V
6. PPS material Body
7. DHM : Domestic Hot water Mixing Modulation
① ② ③ ④ ⑤ ⑥ ⑦ ⑧
⑨
⑩
⑪ ⑫ ⑬ ⑭ ⑮
⑯
① ② ③ ④ ⑤ ⑥ ⑦ ⑧
Chapter 2 Components description
Chapter 2 Components description
CN11
CN10