7
BOILER
The Electric Flow Boiler is suitable for installation in either open vented or sealed system (max pressure 0.35Mpa/3.5 bar) primary circuits. The lower
cost and therefore most popular option will use the boiler to provide space heating only. Hot water provision will be via an unvented direct stainless
steel or open vented direct copper cylinder heated by immersion heaters.
If the boiler is to provide both space heating and hot water a conventional Y plan or S plan should be used in conjunction with an unvented indirect
stainless steel or open vented indirect copper cylinder. Where a three port valve is to be used a capacitor is required. Seek advice from Technical
Services 0845 260 7260.
The boiler is also compatible with under floor heating.
The boiler FLOW connection (22mm) is at the top of the boiler and the RETURN connection (22mm) is at the base. Ensure all connections to the
Senator boiler are made with 22mm Table X Copper Tube. Plastic pipework is not suitable.
PUMP
The circulating pump must be mounted in the return pipework pumping water upwards through the boiler. Size the pump in the usual way and set to
maximum to ensure sufficient flowrate. The pump fitted to this system and controlled by the boiler must have a thermal cut out device.
The boiler operates a pump overrun. Do not operate the boiler with the pump valves closed.
VENTING
To ensure a satisfactory clearance of air from the boiler mount an auto air release valve in the boiler flow pipework a minimum of 150mm horizontally
offset from the boiler. Do not mount directly above the boiler. see figs 3 & 4 (page 9).
For an open vented system the feed and vent pipes must be close coupled directly behind the pump. see fig 3 (page 9). The static head for the pump
should be between 2.5 mtr and 30 mtr.
BYPASS
The boilers incorporate a pump overrun. To meet Building Regulations all installations must include an automatic bypass within a
circuit of at least 2 meters of 22mm pipework when measured from the boiler flow connection, around the bypass to the boiler return
connection. see figs 3 & 4 (page 9).
Bypass radiators and gate valves are no longer acceptable alternatives.
The installations must include a room thermostat providing full boiler interlock.
