CHOFU AEYC-0639U-CH, Installation And Instruction Manual, Page: 17 / 156

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3. Installation
Piping insulation
The complete water circuit, including all piping, must be insulated to prevent condensation during cooling operation
and reduction of the cooling and heating capacity.
If the temperature is higher than 30°C and the humidity is higher than RH 80%, then the thickness of the sealing
materials should be at least 20 mm in order to avoid condensation on the surface of the sealing.
Be sure to insulate the pipes in order to prevent the water being frozen.
Anti-freeze function setting
PCB(Terminal)
ON 4 3 2 1 6 5 8 7
OFF
DIP SW. position
If the circulation water is mixed with a certain quantity of inhibited monoethylene glycol, then the anti-freeze
function is not necessary.
To disable the anti-freeze function, access the PCB (Terminal) and set “Dip SW1” to OFF.
Remove the wiring lid to access the PCB (Terminal).
“Dip SW1” factory default setting is ON, so the anti-freeze function is enabled.
When Pump SW on the PCB (Terminal) is pressed, the water pump comes into operation to circulate water.
Each digital segment on the right side of the PCB (Terminal) lights up sequentially during pump operation.
The pump is stopped automatically after 10 minutes of operation. If air could not be released this way from the
water circuit, then press Pump SW again after the pump has stopped. If you want to stop the pump before it stops
automatically, press Pump SW again.
Display
Pump SW.
Water loading and air bleeding in the hydraulic circuit
• During filling, it might not be possible to remove all air in the system. Remaining air will be removed through the
automatic air purge valves during first operating hours of the system. Additional filling with water afterwards might
be required.
• The water pressure indicated on the manometer will vary depending on the water temperature (higher pressure at
higher water temperature).
However, at all times water pressure should remain above 0.3 bar to avoid air entering the circuit.
• The unit might dispose some excessive water through the pressure relief valve.
• Water quality must be according to EN directive 98/83 EC.
NOTICE