Safety Valve Connections; Pump Duty; Electrical Connections - Gabarron MATTIRA CMX18i Instrucciones De Instalacion Y Uso

Heating System By-pass
The heating water flow switch requires a minimum flow rate through the boiler of 7 L per minute for correct operation.
Systems fitted throughout with Thermostatic Radiator Valves will require provision of a System By-pass to maintain sufficient
flow should all the valves be closed. (see 7.3 HEATING SYSTEM FLOW SWITCH – E3 ERROR).
System Expansion
An integral 6 L expansion vessel provides for expansion of the heated system water under normal conditions however a
system with larger volumes of water may require extra expansion capacity to be provided.
Cold Water Inlet
A ½" connection is provided for connection to 15mm pipe. An internal non-return valve prevents possible back-flow should
the water main fail.
CAUTION: If the incoming water pressure exceeds 5 bar it is necessary to install a Pressure Reducing Valve set at
2.5 bar on the water main into the dwelling. This will protect the boiler and prevent constant opening of the 7 bar relief
valve.
Hot Water Outlet
A ½" connection is provided for connection to 15mm pipe. To ensure economic operation the pipe run between the boiler
and taps should be in not more than15 mm dia. pipe and the distance as short as possible. The pipe-work should be insulated
to reduce heat loss.

4.8 SAFETY VALVE CONNECTIONS

The 7 bar pressure relief valve on the domestic hot water store may discharge boiling water and should be piped to a safe
but visible drain point e.g. a gulley where any discharge will not cause damage or injury.
CAUTION: A tundish should be incorporated close to the appliance where any discharge will be visible but not
hazardous. The pipe-work should have a continuous fall to the drain and should be of minimum 22mm dia. if more than one
discharge is connected to it.
The 3 bar pressure relief valve may discharge boiling water and should be piped with a continuous fall to a safe yet visible
point where any discharge cannot cause damage or injury.
CAUTION: The discharge pipe-work from the T&P relief valve must be installed by a competent person.
•
The discharge pipe material must be capable of conveying water / steam at 100ºC.
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All installations must be fitted in accordance with all local regulations in force at that time. Failure to comply with
these regulations will invalidate the manufacturers' warranty.

4.9 PUMP DUTY

Boiler equipped with a high efficiency circulation pump, with a maximum delivery head of 6.2 m and a maximum flow of 3.3
m³ / h.
There are selectable operation modes with the built-in knob. You can select constant operating speeds I, II and III.
A LED indicator informs about the operating status of the pump:
- Green: correct operation.
- Green / red flashing: Lower voltage U<180V; overvoltage U>253V; Module overheating
- Red flashing: pump blocked.

4.10 ELECTRICAL CONNECTIONS

Connection to Mains Supply
The CMX15i and CMX18i boilers must be installed in premises having a system impedance of not more than 0.25 + j0.25Ω.
The CMX15i and CMX18i boilers comply with the technical requirements of EN 61000-3-3.
The CMX15i and CMX18i boilers must be installed in premises having a service capacity ≥100 A per phase.
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