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Frequently Asked Questions

Pressurisation

  • What are the terminals for the common alarm on the digital pressurisation units?

Terminals 1 and 2 are for the common alarm, normally closed volt free contact, suitable for 230v and up to 5amps

  • What size of system is suitable for a Mini?

The system size is largely irrelevant, the Mini has a top up rate of 0.4 l/min and as such is only suitable for domestic applications or light commercial with new pipe-work. For systems requiring a larger top up rate please look at the larger units.

  • What is the connection size for the system?

On Mini units the system connection is ¼”, on Midi and Flexfiller units it is ½”.

  • What is the backflow protection (Fluid category) of the pressurisation units?

The Mini, Midi and Flexfiller units all have WRAS approved float valve for direct connection to the water mains, and all have Weir overflow arrangements making them suitable for fluid category 5.

  • Can I use a pressurisation unit to fill a system?

The Mini pressurisation units are not capable of filling a system as the pump flow rate would be insufficient. The Midi and Flexfiller units have a system fill option as standard.

  • How does a pressurisation unit work?

Water is allowed into an internal storage tank, the system pressure is monitored by the pressurisation unit, when it drops to a preset level the integral pump(s) will start, draw water from the tank and top up the system.

  • Should I fit a non return valve between a pressurisation unit and the system?

No, the pressurisation unit need to ‘see’ the system pressure to be able to top up when needed, but also as a safety feature with the high pressure alarm (If fitted).

  • Where should I connect the pressurisation unit on the system?

Always fit the pressurisation unit local to the system expansion vessel. This ensures that the temperature at the point of connection is below 70 °C.

  • What information do I need to size/select a pressurisation unit?

The main information required is the static height from the unit to the top of the system (cold fill pressure required to overcome the static height), and if possible the size of the expansion vessel on the system.

  • Do I need to get pressurisation equipment commissioned?

It is always advisable to get pressurisation equipment and vessels commissioned. This ensures that the equipment is set up correctly, engineer visits booked as warranty calls that are evaluated as incorrect set-up are chargeable.

  • What is the warranty and returns process?

The warranty is normally 18 months from the date of manufacture, and this covers manufacturing defects only, not misuse by the end user or as result of incorrect/non existent commissioning. For returns a Goods Returns Number (GRN) must be obtained from the Flamco sales team before returning the goods. A detailed description of the fault (Faulty is not a description on its own) will also be required.

 



Vessels

  • What information do I need to size/select an expansion vessel?

To correctly size an expansion vessel you require the highest water temperature (Flow temperature), the static height, the safety valve setting and either the system volume or the boiler/Chiller power rating.

  • Where should I connect the expansion vessel on the system?

The expansion vessel must be on the cold return leg to the boiler, as this is typically 71 °C or below. The maximum allowable temperature at the diaphragm is 70 °C on heating/Chilled vessels.

  • What vessel do I need for my heating system?

The most common vessel used for a sealed system is a Red Heating vessel.

  • What vessel do I need for my domestic hot water system?

The most common vessel for an unvented, domestic or consumable water system (taps, showers etc) is a Silver Potable vessel.

  • Do I need an anti-gravity loop?

An anti-gravity loop is a loop of pipe connecting the expansion vessel to the system. The idea is that the loop goes to a much higher level than the vessel and forms a thermal trap, with the high temperatures from the system remaining at the top of the loop and cooler water is then in the pipe-work to the vessel. By installing the expansion vessel on the coolest part of the system, in most cases, an anti gravity loop is therefore unnecessary. 

  • What accessories do I need for my domestic heating system?

On a domestic heating system it is typical to use as a minimum, an expansion vessel, a filling loop, a pressure gauge and a safety relief valve.

  • Every morning my system has no pressure, I top up from the mains and next morning the pressure has gone, what is happening?

It is highly likely that the vessel has been installed for some time without the gas charge being checked (which must be carried out annually with the vessel disconnected from the system) or that the vessel is too small for the system and an additional expansion vessel is required.

  • I have extended my heating system to include my new extension, the needle on my pressure gauge seems higher than before what is happening?

It is highly likely that the vessel is too small for the system and an additional expansion vessel is required.

  • What is the warranty and returns process?

The warranty is normally 12 months from the date of installation, and this covers manufacturing defects only, not misuse by the end user or as result of incorrect installation. For returns a Goods Returns Number (GRN) must be obtained from the Flamco sales team before returning the goods. A detailed description of the fault (Faulty is not a description on its own) will also be required.



Cylinders

  • Can I use a 3 port zone valve instead of the supplied 2 port valve?

The approval for the equipment against the building regulations requires the use of a 2 port valve to isolate the heating coil of the cylinder when the water reaches the desired temperature. If there is a desire to use a 3 port valve to divert the water flow, then this can be fitted upstream of the 2 port valve. The 2 port valve must be fitted as directed.

  • Water is dripping from the Temperature and Pressure relief valve (T&P) what do I do?

Firstly check the pressure of the system, it may well be doing its job. Secondly verify that the gas charge in the potable expansion vessel was checked at the last annual service.

  • How often must I get the system serviced?

The system as a whole must be services annually as described in the warranty/installation instructions.

  • Why is the expansion vessel not red?

Red vessels are normally for sealed heating systems and as such are not suitable for consumable water (taps and showers are fed from mains water, full of dissolved oxygen). Consumable water will corrode red ‘heating’ vessels and the vessel will fail.

  • Your wiring diagram shows a permanent live to the boiler, I want to control using a time clock how do I do this?

The most logical solution is to replace the main live feed to the cylinder controls with one from the time clock.

  • My water is not hot enough what do I do?

The thermostat control on the front of the cylinder will allow you to increase the temperature cut-out of the cylinder. As long as you have sufficient energy coming from the boiler this will increase the temperature of your stored water.

  • Do I need a pump on my hot water pipe to feed my shower?

On an unvented (mains fed) cylinder the water pressure from the hot and cold taps is balanced, as a result it is not normally necessary to use a pump on hot supply to the shower. In areas of poor water pressure or flow a booster set may be needed to give the required water flow/pressure.

  • My boiler is not rated as the data table in the instructions suggests, what affect will that have on the reheat time for my hot water?

Quite simply the water heat up time will be longer, other than this, the performance of the cylinder should not be affected.

  • What is the warranty and returns process?

The warranty is 25 years for the stainless steel cylinders and 12 months for the accessories from the date of installation, and this covers manufacturing defects only, not misuse by the end user or as result of incorrect installation or incorrect servicing or incorrect commissioning. For returns a Goods Returns Number (GRN) must be obtained from the Flamco sales team before returning the goods. A detailed description of the fault (Faulty is not a description on its own) will also be required.