DIGITAL THERMOSTAT OPERATION
NA6888 User Guide
! Main Function and Technique Index
Main Function:
The controller is the special controller for heat pump water heater, it contains two temperature
sensors (water temperature, outdoor temperature), four control outputs (compressor, valve, fan, water
pump) and one alarm signal input (used for high and low pressure protection). Its main function is
showing below:
" Temperature Display and Controlling: It can display water tank temperature and outdoor
temperature, and control the temperature of water in tank between the temperature upper and lower limit.
" Auto Defrost Controlling: It has optimize design of logical defrost controlling logic fit for heat
pump, and can defrost effectively in order to ensure the outdoor machine can run normally at low
temperature.
" External alarm: one outside alarm signal input, it can be set to 5 modes: always open, always open
locked, always closed, always closed locked or forbidden.
" Real Time Clock (RTC): Internal RTC, it is still running when power off, and it supplies accurate
time, used for real time defrost function etc.
" Others: Temperature upper and lower limit can be set, direction of four-way valve can be set,
compressor start delay protection, temperature sensor error alarm and so on.
Main Technique Index:
# Temperature display range: -50～150℃(The resolution is 0.1℃)
-58～302℉(The resolution is 0.1℉)
# Power supply: AC 220V±10% or AC 380V±10% (Refer to the wiring diagram)
# Operating environment: temperature -10℃～50℃, humidity≤85%.
# Relay contact capability: 2A/250VAC (pure resistive load)
# Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K
# Executive standard: Q/320585 XYK 01
$ Operating Guide
Panel:
% What’s the meaning of the index lights on the panel?
The function of the LED on the panel is showing below:
To Next Page
Loading...
