© MHG Heating Ltd
8
MHG Heating Ltd, Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey, KT20 5LR
Phone 0845 6448802 Telephone. 0845 6448803 Fax. Email
Website www.mhgheating.co.uk
010313
Draft
Ensure that the Inlet Control Group is fitted adjacent to the cylinder with the arrows on the side pointing in the direction of the flow.
It must be no further away than 500mm and have no devices or connections/draw offs between it and the cylinder*.
Balanced supplies for showers and mixer taps only should be taken from the appropriate connection on the Inlet Control Group
(see illustration).
Water regulations require that a single check valve should be fitted in the balanced draw off to prevent back flow.
The inlet group supplied incorporates a single check within the body of the group.
*The expansion vessel for the cylinder must be fitted between the inlet control group and the unit (see illustration)
A suitable means for draining the unit must be incorporated into the cold feed (see illustration) –
Positioning the drain as suggested will allow a minimum of 80% of the cylinder to be drained off.
Connect the discharge pipework and tundish to the valve labelled “P&T” The tundish should be connected to the cylinder using 15mm metal
pipe.
The tundish (supplied) must be fitted within 500mm of the outlet of the P&T valve and have at least 300mm of straight metal pipe below it,
before any elbow or bend.
The pipework below the tundish should be fitted in accordance with the current edition of the Building Regulations.
The discharge from the expansion valve on the Inlet Control Group must be connected into the discharge pipe work.
We recommend a double check valve should be fitted to the hot water draw off to prevent any back pressure.
Connect the boiler flow and return to the labelled connections. Before making the connections ensure that the coil is free from obstructions by
blowing through it.
The Energy Cut Out valve is an essential part of the safety requirements for indirect mains pressure cylinders and should be installed on the
primary flow to the cylinder with port ‘B’(embossed on side of valve body) to the cylinder. The valve will open and close on receiving a
signal from the cylinder thermostat.
No further control is required for the hot water in a two zone valve system.
This valve must also be used in a flow share (Y Plan) system, in conjunction with the mid-position valve, to act as a safety cut out
valve.
The cylinder thermostat controls the temperature of the hot water and also acts as an emergency cut out in the event that
the boiler temperature controls fail. The cylinder thermostat is fitted into the pocket labelled “Store Temp Control” in the
cylinder, and should be connected to operate the energy cut out valve in accordance with the wiring diagram for the scheme being installed.
Connect hot water draw off to connection labelled “Hot Water Draw Off”.
