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LP-532 REV. 8.13.2014
LP-532 REV. 8.13.2014
Function explanation
[Initial power-up condition]
When power is supplied, zero point of the mixing valve is checked for 6 seconds. After that, normal
800 steps function is in progress. At this time, if zero point is not confirmed, Er 66 occurs. After error is
automatically restored when zero point was confirmed, normal 800step function is in progress.
[DHW mode]
DHW mode is activated by the flow sensor sensing flow of 0.5 GPM or above. When there is DHW
demand, flow sensor monitor the frequency (range: 8Hz to12Hz), within 2 minutes. DHW temperature can be
set 95~140℉(35℃~60℃). If there is DHW demand, burner starts and mixing valve operates automatically.
Safety device function
[Power supply and frequency stability protection]
If the power supply voltage is less than 90V input for 10 seconds, error code will be displayed, and
all outputs will be stopped except for the fan post-purge. The error will automaticall reset when voltage is
abore 100V.
The reference frequecy value is determined by checking the power supply frequency 50Hz or 60Hz.
If frequency is outside the range of ± 3Hz from the reference frequency, error code will be displayed, and all
outputs will be stopped except for the fan post-purge. The error will automaticall reset when the frequency is
whithin ± 3Hz of frequency standards.
[Over-heating protection]
The water heater has two overtemperature switch. Over temperature switch is attached to the burner
and the outlet side against the failure of the temperature sensor dual protection device. Overheat error
occurs when the temperature switch is open and close until the fan is operated.
[Gas leakage detecting]
The controller is designed with a builtin gas leak detection sensor that will shut the unit down in case
of gas leak. A fault code will occur if the sensor detects gas leak for more than 10 minutes or 3 times in 1
hour.
[Mixing valve operation]
During a DHW demand, mixing valve modultaes to control the DHW outlet temperature by mixing
the cold and hot water. When there is no DHW demand, mixing valve stands vy at 800 steps. To prevent
the mixing valve mechanism from getting stuck, it moves 2,000 steps (fully closed) for 5 sec, then moves to
default position (fully opened) and finally back to 800 step.
Chapter 3 How to use control panel
Control panel
Controller LCD Specification
Customized Temperature Control
Advanced technology used for the flow sensor and heat capacity control makes domestic hot water highly
efficient by maintaining constant temperature during usage.
Chapter 3 How to use control panel
Control Panel Mode
Status display mode
Status display mode will be activated when button B is pressed and held for five seconds
when display panel is powered ON.
