Schneider Electric Drayton Two Pipe Thermostatic Radiator Valves Instructions
- October 30, 2023
- Schneider Electric
Table of Contents
Drayton Two Pipe Thermostatic Radiator
Valves Instructions
Two-pipe Thermostatic Radiator Valves with automatic balancing
Drayton Two Pipe Thermostatic Radiator Valves
Installation and operating instructions
Approved to EN215 : All Drayton Thermostatic Radiator Valves are approved
to the European Standard EN215.
Quality Standards : All Drayton Thermostatic Radiator Valves are
manufactured in factories assessed and certified to BS EN ISO 9001.
General description
Drayton’s auto-balancing TRVs maintain a constant flow rate in the radiator
regardless of changes in system pressure or other TRVs in the system opening
and closing. As such they help to avoid cold spots in the home and contribute
to improved boiler efficiency.
Description of operation
The auto-balancing valves contain a cartridge which maintains flow rate
through the radiator at all times. Note that the valve must simply be set
according to the output of the radiator to ensure that each radiator receives
the correct flow of water at all times.
Installation
IMPORTANT : observe the flow direction indicated on the side of the
valve.
When filling and commissioning the system ensure that valve insert is in
commissioning position (the valve is delivered in the commissioning position).
Use the balancing key 07 35 162 or a 11mm spanner to adjust the hex at the top
of the valve insert and align setting value with index mark according to the
table in this document. This will ensure that the radiators always receive
the correct flow regardless of system pressure and other valves opening and
closing. The lock shield should be fully open and only used only to isolate
the radiator.
Mounting
When using jointing compound, care must be taken to avoid any excess being
transferred to the valve seat, as this could cause malfunction of the valve.
DO NOT FIT CAPILLARY FITTINGS near to these valves as excessive heat from a
blowtorch may damage the internal valve components. The maximum temperature of
the thermostatic head is 50 °C.
Integral TRVs
Setting values with different radiator performances and system differential temperatures
O = Radiator performance, △t = System differential temperature,
△p = Differential pressure
1 W = 3.4120 BTU/h
General considerations on balancing
- Unnecessarily higher return water temperatures reduce the operational efficiency of the heat source.
- Unbalanced systems can result in radiators not heating up properly, causing hot and cold spots to emerge within a property.
- Unbalanced, ineffective heating system leads to consumer dissatisfaction.
- Manual balancing is accurate only for a single set of conditions; when TRVs start to close the flow rate will increase on the other radiators.
- Settings can be lost when decorating or replacing radiators.
- Balancing with a Lock shield valve is less than precise due to unsuitable valve authority.
Solutions:
- Installing a modulating pump and setting to the lowest setting that will achieve the correct ∆ T drop across index circuit.
- Installing Automatic Balancing TRVs to always deliver the required flow rate and achieve the correct ∆ T across all radiators. Any radiator acting as a bypass and is always ON should also have an auto-balancing valve fitted.
When draining/refilling or cleaning the system always leave the valves in their commissioning position (as supplied) before setting according to the individual radiator output.
If the output of the radiator is not known please use the setting position calculator on the Drayton website, here:
https://www.draytoncontrols.co.uk/calculator
You’ll also find further help and advice on radiator balancing.
06490344001 Is A
Schneider Electrical Controls Ltd
401 Soothsay Drive
Plymouth
PL6 6QT
United Kingdom
Technical Helpline Tel: 0333 6000 622
customer.care@draytoncontrols.co.uk
Website: www.draytoncontrols.co.uk
References
- Drayton Controls | Heating controls, TRVs and thermostats
- Radiator Calculator | Drayton Controls : Heating controls, TRVs and thermostats
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