Heating System And Refrigeration; Installation; Connect The Pipework - Baxi LUNA DUO-TEC 1.70 User Manual

8.

HEATING SYSTEM AND REFRIGERATION

The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium is piped in parallel with
the boiler with appropriate valves to prevent the chilled medium from entering the boiler.
The boiler piping system of a hot water boiler connected to heating coils located in air handling units where they may be exposed
to refrigerated air circulation must be equipped with flow controI valves or other automatic means to prevent gravity circulation of
the boiler water during the cooling cycle.
9.

INSTALLATION

9.1

CONNECT THE PIPEWORK

• Thoroughly flush out all the water pipework.
•
WARNING
Ensure that all the plastic caps are removed from the boiler connections.
• Secure all the valves/fittings to the boiler
• Ensure the washers supplied are utilized.
• Valves and fittings should be facing the rear wall.
• Fit the union bends to the valves.
Note:
a. If soldering to the boiler union bends, ensure that the bends are not connected to the valves, otherwise the internal seals may
be damaged.
b. Ensure the 3/4" / 22.2 mm isolating valve with the filter is fitted to the heating return connection.
c. Fit the pressure relief valve connection vertically before the heating isolating valve.
• Connect the system valve pipework to the boiler.
Do not forget that the pressure relief valve discharge pipe must be routed clear of the boiler to a drain in such a manner that it may
be seen, but cannot cause injury to a person or property.
• Ensure that all the valves are closed (spidle flats at right angels to valve) and do not turn on the water or gas supplies at this
stage.
• Connect the condensate trap, supplied with the boiler, to a drain making sure there is a continuous slope towards the drain.
Avoid level horizontal sections.
WARNING
The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psi (3.40 kPa - 34.47 mbar).
The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test pressures equal to or less than 14" w.c. (3.5 kPa.)
The boiler shall be installed such that the gas ignition system components are protected from water dripping, spraying,
rain, etc. during appliance operation and service (circulator replacement, condensate trap, control replacement, etc.)
25 7703477.01 (1-03/18)