Installation manual

Coopra Advanced Heating Technologies Installation manual 40 EN
27
CHAPTER 8. MALFUNCTIONS
High voltage!
The wiring of the pump, the three-way valve, fan and wiring of
the gas control can be under a voltage of 230 VAC.
8.1. Draining the unit
• On the central heating side: Switch the unit off and
open the filling tap.
• On the HWS side: Switch the unit off. Shut the inlet
combination off. Open a hot water tap and the
protection device of the inlet combination.
When using the group of taps (see the accessory list), it is
possible to only tap the unit. Proceed as follows:
- Switch the unit off.
- Close all taps under the unit.
- Close the inlet combination
- Open the filling tap under the unit.
- Open a hot water tap.
- Open the protection device in the unit and of the inlet
combination.
8.2. No signal on the display
If there is no signal on the display, check if the mains voltage of
230 VAC is present on the unit.
There must be voltage of 230 V on the live connection "L" and
no voltage on the neutral connection "N".
Check whether the on/off switch on the bottom of the unit is
switched on.
Check the glass fuse on the printed circuit board Careful, high
voltage! The fuse is placed on the printed circuit board in the
230 V circuit. So first disconnect the unit mains!
8.3. Fault code 'U/d or U/O' (alternating U with a status code
will appear on the display)
This fault code occurs when the Live and Neutral are exchanged
or when no Earth is present.
Reverse the plug so that the Live is connected to Live and
Neutral to Neutral.
8.4. Unit does not respond to central heating heat demand
Is the parameter for the type of unit correctly set in the menu?
• Parameter H = 1 is not active ( no heating).
• Parameter H = 4 is not active ( no heating).
• Parameter H = 5 is not active ( no heating).
Check for correct assembly and/or cable fracture of the wiring of
the room thermostat (terminals 1 and 2) of the terminal block)
and, if applicable, the external sensor (terminals 5 and 6) of the
connection to the building management system (terminals 3 and
4).
8.7. Check function of gas control
Open the outlet pressure measurement nipple of the gas control
- connect the pressure meter to the outlet pressure
measurement nipple
- measure the pressure (this must be zero)
- start the unit.
- the unit will now be rinsed at 1500 rpm
- next, the fan starts at the initial speed of 3000 rpm.
- the pressure meter will now indicate an underpressure of
approximately 3 mbar
- when the gas control is opened, the zero pressure regulator will
again make zero pressure.
- if not, then the gas control is not functioning.
8.8. Measuring the fan impedance
Check the resistance of the coil, the two outermost contacts on
the fan motor.
The value that the multimeter
shows must be between 115 and
120 Ohms at room temperature.
If the fan is defective, the drive on
the drive on the Manager may also be damaged.
8.9. Fitting instructions for the pressure sensor
The seal is made with an “0”-ring. The pressure sensor must
only be tightened slightly more than hand tight.
8.10. Fitting instructions for the safety valve
The safety valve must be tightened with a torque of 10 Nm.