15
Chapter1ProductCharacteristics
Water leakage operation flow
Pre-heating mode operation flow
Freeze Prevention control flow
Circulation Pump Shutdown
Freeze Prevention control condition
Water Flow Control Valve closed
NO
Circulation Pump Shutdown
YES
NO
HX Thermistor Temp
≤ 41 ℉(5℃)
HX Thermistor Temp
normal
≤ 46 ℉(8℃)
Combustion proceed
≥ 50 ℉(10℃)
HX Thermistor Temp
≥ 104 ℉(40℃)
Hot Water Thermistor normal
Hot Water Thermistor
Temp
≤ 46 ℉(8℃)
Thermistor Temp
≤ 50 ℉(10℃)
Circulation Pump Shutdown
YES
NO
YES
Circulation Pump Shutdown
Error occurs 44
Pre-heating mode
Temp setting - Δt ≥ HX
Thermistor Temp
HX Thermistor Temp ΔT
(=Max Temp-Min Temp)
< Δ 5℉(3℃)
Pre-heating Start
Error count ≥ 2 time
NO
YES
Pre-heating Stop
NO
ΔT Setting - Install mode (HT) : LO [27℉(15℃)]
HI-1 [18℉(10℃)]
HI-2 [ 9℉( 5℃)]
FreezeProtectFlowChart
►
FreezePreventioncontrolow
►
Waterleakageoperationflow
►
Pre-heatingmodeoperationflow