C&M MX2 24 Nat Installation and operating instructions manual - Operating
12
PRESSURISING (fig. 12)
Hot water circuit:
- open the cold water tap 34
- drain the appliance by opening the various hot water taps
Central Heating :
- Open flow and return valves on the boiler 31 and 35
- Open the automatic air vent
- Open filling taps 36 and 37, and vent radiators.
- Set system pressure, close filling taps 36, 37 and remove
filling loop 38.
- Check for leaks.
- Manually check pump is free to turn
Gas circuit
- open the gas tap 33
- flush the gas circuit
- check the sealing on the whole gas circuit
8
Operating
Fig. 12
31
33
34
35
16
SETTINGS
The water heater is supplied with all the setting buttons OFF (fig. 13) and the potentiometers turned fully anti-clockwise. It is
possible to adjust these settings if required.
In this case, it is necessary to open the electronic control unit.
Switch the water heater power on, remove the casing and open the control unit by pressing the two push buttons P (fig.
10). The setting buttons are on the circuit board behind the blanking cover E.(fig. 11)
- A1 allows the Heating Anti-cycle Timing to be set to 30 seconds or 3 minutes
HAT: period during which restarting the burner is prohibited during a heating regulation phase
- A2 allows the heating pump to be run at high or low speed
- A3 to fix the heating temperature setting to 40 °C whatever the heating temperature adjustment button position 22 (fig. 3)
- A4 enables operation either in modulating heating mode, or on/off mode
- B1 reserved
- B2 reserved
- B3 allows the hot water flowmeter timing to be adjusted to 0 or 1.5 seconds
- B4 enables operation in conjunction with a CELECTIC, in this case, switch off the flow limiter.
setting ON: the hot water setting is fixed at 65°C whatever the position of the domestic hot water temperature setting
button 21.(fig. 3)
Note: after a power cut-out or board reset, the HAT is cancelled for 3 minutes.
- P1: potentiometer to limit heating output within the setting limit made on P2 (see table on page 13)
- P2: potentiometer enabling ignition output factory set (12,7 kW - 24 FF, 16 kW - 30 FF)
- P3: reserved
Once adjustments have been made, replace blanking cover E, close the control unit cover and refit the casing.
36
37
38