Description And Operation Of The Controller - GRE Comfort Heat Serie Manual De Instrucciones

TECHNICAL MANUAL. START-UP AND OPERATION
E. Description and operation of the controller
NA6888 User Guide
Main Function and Technique Index
Main Function: the controller is the special controller for heat pump water heater, it contains 2 temperature sensors (water tempe-
rature, outdoor temperature), 2 control outputs (compressor, defrost) and one alarm signal input (used for high and low pressure
protection). Its main function is showing below
Temperature Display and Controlling:
re in water tank between the temperature upper and lower limit.
Auto Defrost Controlling: it has defrosting controlling logic of heat pump optimization design, and can defrost effectively in order
to ensure that the outdoor machine can run normally at low temperature, you can set several kinds of defrost way: four-way valve
defrost, bypass valve defrost or electric heat defrost.
one outside alarm input, it can be set to 5 modes: always open, always open locked, always closed, always closed
External alarm:
locked or forbidden.
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°C (the step is 0.1°C) - Temperature setting
range: -45/145°C (the step is 0.1°C) - Power supply: AC 220V±10% or AC
380V±10% 50Hz (refer to the wiring diagram)
- Operating environment: temperature -20Cº/50Cº, humidity
85%. - Relay contact capability: 2 A / 380 V AC (pure resistive load)
- Temperature sensor: NTC R25=5k
- Executive standard: Q/320585 XYK 01-2004 (NA8824-HTD)
Operating Guide
34
it can display water tank temperature and outdoor temperature, and control the temperatu-
, B (25/50) =3470K
92
Panel
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